Rosemount 3491, 3492, 3493 Reference Manual

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Universal Control Unit

www.rosemount.com

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Rosemount 3490 Series

Universal Control Unit

NOTICE

Read this manual before working with the product. For personal and system safety, and for
optimum product performance, make sure you thoroughly understand the contents before
installing, using, or maintaining this product.

Within the United States, Rosemount Inc. has two toll-free assistance numbers.

Customer Central: 1-800-999-9307(7:00 a.m. to 7:00 p.m. CST)
Technical support, quoting, and order-related questions.

North American Response Center:

Equipment service needs.

1-800-654-7768 (24 hours a day – Includes Canada)

For equipment service or support needs outside the United States, contact your local
Rosemount representative.

The products described in this document are NOT designed for nuclear-qualified
applications.

Using non-nuclear qualified products in applications that require nuclear-qualified hardware
or products may cause inaccurate readings.

For information on Rosemount nuclear-qualified products, contact your local Rosemount
Sales Representative.

This device complies with part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired
operation.

Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
HART is a registered trademark of the HART Communication Foundation.

www.rosemount.com

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Table of Contents

SECTION 1
Introduction

SECTION 2
Overview

SECTION 3
Installation

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Manual Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Introduction To The 3490 Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Summary of Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Two mounting options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Transmitter input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Control functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Control Unit Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Standard functions (Models 3491/3492/3493) . . . . . . . . . . . . . . . . 2-3

Difference, sum and product functions (Model 3492). . . . . . . . . . . 2-3

Logging functions (Model 3493) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Control Unit Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Before You Install . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

General considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Mounting the Rosemount 3490 Series Control Unit . . . . . . . . . . . . . . 3-3

Mounting the IP-rated Wall Mount Models . . . . . . . . . . . . . . . . . . . 3-3

Mounting the

NEMA 4X-rated Wall Mount Models. . . . . . . . . . . . . . . . . . . . . . . . 3-3

Mounting Panel Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Electrical Connections on Wall Mount Models . . . . . . . . . . . . . . . . 3-6

Electrical connections on Panel Mount Model . . . . . . . . . . . . . . . . 3-8

Transmitter Connections and Cabling . . . . . . . . . . . . . . . . . . . . . . 3-9

Connecting HART Transmitters to 3492. . . . . . . . . . . . . . . . . . . . 3-10

Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Earthing Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Relay Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Current Output Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

Digital Control Voltage free Contact Inputs . . . . . . . . . . . . . . . . . 3-12

RS232 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

SECTION 4
Getting started

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Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Switching on the 3491/3493 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Switching-on the 3492 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Rosemount 3490 Series

The Hierarchical menu system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

How to navigate the menu system . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

About parameter screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Before you begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Comfort (system) settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Transmitter inputs

to the 3490 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12

Profile Calculations for Contents and Flow Applications . . . . . . . 4-23

Digital Inputs IN1 and IN2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-33

Logging (3493 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34

Current Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38

Relays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39

About Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-59

About Totalising On Model 3491 . . . . . . . . . . . . . . . . . . . . . . . . . 4-62

About Totalising on Model 3492 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-63

About Totalising on Model 3493 . . . . . . . . . . . . . . . . . . . . . . . . . . 4-64

Totalising examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-67

Primary Display Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-71

Serial Communications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-73

PIN Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-74

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SECTION 5
Service and Health
Checks

APPENDIX A
Reference Data

APPENDIX B
Product Certifications

APPENDIX C
Menus and Parameters

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Health Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Health Check: 3490 Series Control Unit. . . . . . . . . . . . . . . . . . . . . 5-2

Health Check: Rosemount 3102/3105 Series transmitters. . . . . . . 5-8

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Dimensional drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6

Model Code 3491, Standard Control Unit. . . . . . . . . . . . . . . . . . . . A-6

Model Code 3492, Differential Control Unit . . . . . . . . . . . . . . . . . . A-7

Model Code 3493, Logging Control Unit . . . . . . . . . . . . . . . . . . . . A-8

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

European Directive Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2

Hazardous Locations Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

ATEX Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

Underwriters Laboratories Inc. (UL) Approvals . . . . . . . . . . . . . . . B-3

Canadian Standards Association (CSA) Approvals . . . . . . . . . . . . B-4

IECEx Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

Approval Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5

Menus and parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

APPENDIX D
Additional Features

1-2

Restoring the factory defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

How to restore the factory default settings . . . . . . . . . . . . . . . . . . .D-1

DIRECT Menu screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-2

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Rosemount 3490 Series

APPENDIX E
Support for HART®
Transmitters

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Fully Supported Transmitters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Universal and Common Practice Commands . . . . . . . . . . . . . . . . . . . E-1

Universal Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

Common Practice commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2

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Rosemount 3490 Series

Section 1 Introduction

Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1

Manual Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2

Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-3

SAFETY MESSAGES Procedures and instructions in this manual may require special precautions to

ensure the safety of the personnel performing the operations. Information that
raises potential safety issues is indicated by a warning symbol ( ). Refer to
the safety messages listed at the beginning of each section before performing
an operation preceded by this symbol.

Failure to follow these installation guidelines could result in death or serious
injury.

• Make sure only qualified personnel perform the installation.

• Use the equipment only as specified in this manual. Failure to do so may
impair the protection provided by the equipment.

Explosions could result in death or serious injury.

• Verify the operating environment of the Rosemount 3490 Series Control Unit is
consistent with the appropriate locations certifications.

Electrical shock could cause death or serious injury.

• Use extreme caution when making contact with the leads and terminals.

www.rosemount.com

Any substitution of non-recognized parts may jeopardize safety. Repair, e.g. substitution
of components etc., may also jeopardize safety and is under no circumstances allowed.

Reference Manual

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Rosemount 3490 Series

May 2007

MANUAL OVERVIEW This manual provides installation, configuration and maintenance information

for the Rosemount 3490 Series Control Unit.

Section 2: Overview

Section 3: Installation

Section 4: Getting Started

Section 5: Service and Health Checks

Appendix A: Reference Data

Appendix B: Product Certifications

Appendix C: Menus and Parameters

Appendix D: Additional Features

Appendix E: Support for HART

®

Tra nsmitt ers

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Rosemount 3490 Series

SERVICE SUPPORT To expedite the return process outside of the United States, contact the

nearest Rosemount representative.

Within the United States, call the Rosemount National Response Center using
the 1-800-654-RSMT (7768) toll-free number. This center, available 24 hours
a day, will assist you with any needed information or materials.

The center will ask for product model and serial numbers, and will provide a
Return Material Authorization (RMA) number. The center will also ask for the
process material to which the product was last exposed.

Rosemount National Response Center representatives will explain the
additional information and procedures necessary to return goods exposed to
hazardous substances. This can avoid injury if they are informed of and
understand the hazard. If the product being returned was exposed to a
hazardous substance as defined by OSHA, a copy of the required Material
Safety Data Sheet (MSDS) for each hazardous substance identified must be
included with the returned goods.

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Section 2 Overview

Introduction To The 3490 Series . . . . . . . . . . . . . . . . . . . . page 2-1

Control Unit Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-3

Control Unit Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4

Rosemount 3490 Series

INTRODUCTION TO THE
3490 SERIES

The Rosemount 3490 Series is a range of control units, providing a wide
range of control functions and display of the measured variable.

Summary of Features • Full support for Rosemount 3100 Series ultrasonic transmitters.

• Intrinsically Safe power supply to transmitters.

• 4-line LCD display with back light - for text and graphics.

• 6-button keypad - for local interrogation and programming.

• Intuitive menu system.

• 4-20mA / HART input.

• Two digital inputs.

• 5 relay outputs.

• Isolated 4-20mA output.

• LED indicator for system health.

Two mounting options There are two mounting versions of the control unit available:

• Wall mounted.

• Panel mounted.

The wall mounting version has a tough rated housing for installation indoors
or outdoors, whilst the panel mounting version is for installation in a control
room panel/cabinet.

Figure 2-1. The Rosemount
3490 Series range.

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IP-rated Wall Mount

There are two housing styles for the wall mounted option:

• IP-rated Wall Mount.

• NEMA4X-rated Wall Mount.

The panel mounting option has a black housing.

NEMA4X-rated Wall Mount

Panel Mount

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Rosemount 3490 Series

May 2007

Transmitter input The Control Unit will accept input from a 4-20mA / HART transmitter.

Model 3492 will accept inputs from two HART transmitters.

NOTE

The Rosemount 3490 Series is designed for non-hazardous (safe) area
installation, but can be connected to a transmitter installed in a hazardous
area. For certifications of the Control Unit, see Appendix B.

Control functionality Control functionality is provided by five SPCO voltage-free contact relays in

the control unit. There is also an isolated 4-20mA signal output.

For applications where the functionality of the control unit is linked to other
external events, the two digital input ports will accept contact closure signals.

Front Panel The Rosemount 3490 Series is programmed simply using the 6-button

membrane keypad on the front panel. Menu structured programming is
employed, with the display assisting the user with dynamic help text.

A full specification for the control unit is in Appendix A.

2-2

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Rosemount 3490 Series

CONTROL UNIT
FUNCTIONS

Standard functions
(Models 3491/3492/3493)

For a full guide to programming the Rosemount 3490 Series Control Unit, see
“Programming” on page 4-9.

Using either the input from a 4-20mA or HART transmitter, all models of the
3490 Control Unit will provide the following standard functions:

• Calculation and display of the 3490’s primary variable (PV).

The user can choose this to be the reading coming from the transmitter,
which may be any measurement. For example, the Rosemount 3100
Series of transmitters can measure the liquid level or distance-to-surface,
or calculate tank content or flow rate in an open channel structure
e.g. a flume or weir. A totaliser function is included.

The Control Unit is pre-programmed with standard volumetric and flow
equations to convert a level signal into contents or flow, and also has a
20-point user-programmable look-up table for non-standard applications.

• Output a 4-20mA signal.

The 4-20mA output is usually proportional to the displayed PV, and is
displayed in bargraph form (0% to 100%).

• Relay control functions.

There are five freely assignable relays. Relay 5 is a fault relay by default,
which may be assigned to control duty if required. The other relays are
available for the user to set them to operate at chosen values of the
displayed PV, or other calculated values.

Difference, sum and
product functions
(Model 3492)

Logging functions
(Model 3493)

The control unit is pre-programmed with a selection of popular pump
control routines for wet well and sump control, along with energy saving
overrides.

• Voltage-free (digital) contact close input.

Up to two voltage-free contact closure inputs may be connected, allowing
external override of control functions if desired.

• Programming a transmitter using the control unit

When a Rosemount 3100 or 3300 Series HART transmitter is connected,
the 3490 will recognize the transmitter, allow selection of variables to be
processed, and allow full access to and programming of the transmitter
configuration parameters, eliminating the need for any other HART
programming device.

Any other HART transmitter can be connected to the 3490 - in this case
the 3490 will recognize the transmitter as an "unknown instrument" and
will allow access to and programming of the Universal and Common
Practice HART commands.

Model 3492 has all the standard functions listed above, and extra functions
for calculating the difference, sum, or product of two separate inputs from
HART transmitters.

Model 3493 has all the standard functions listed above, and a 7000 event
logging facility.

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Rosemount 3490 Series

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CONTROL UNIT
FRONT PANEL

Figure 2-2. Front panel fascia

This section describes the front panel fascia, which comprises keypad,
display, and status LED.

NOTE:

A full specification for the control unit is in Appendix A.

4-line back-lit LCD display

Status LED

Keypad

Keypad The membrane keypad comprises 6 function buttons. They are used for

navigating a hierarchical menu system and for viewing/editing application
parameters. A summary of each button function is provided below.

Button What the button will do

When the Primary Display is shown, press the red (ENTER) button to access the
Hierarchical Menu System. At other times, this button is for selecting a menu
option and for confirming an edited parameter value or option.

When navigating the menu system, the UP-ARROW button is for moving upwards
one line. At other times, this button is for scrolling up through a list of alphanumeric
characters or a multiple-choice list of options.

When navigating the menu system, the DOWN-ARROW button is for moving
downwards one line. At other times, this button is for scrolling down through a list
of alphanumeric characters or a multiple-choice list of options.

The LEFT-ARROW button is for moving left e.g. to another character when editing
a parameter value.

The RIGHT-ARROW button is for moving right e.g. to another character when
editing a parameter value.

When navigating the menu system, the ESCAPE button will return you to the
previous menu level and the Full Primary Display.
At other times, e.g. editing a parameter, it is for restoring a parameter value/option
to the setting prior to when editing started.

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Rosemount 3490 Series

Display The LCD display shows both text and graphical information. After the

power-up and self-checks are completed, the Primary Display is presented.

The default display typically features a digital clock, measured variable with
display units, and status icons.

There are some display differences between the models:

• On models 3491 and 3492, a bar graph represents the 4-20mA output
signal. (Model 3493 display can be programmed to show the bar graph.)

• On model 3492, there are extra graphics relating to having two
transmitters connected to the control unit.

• On model 3493, there are two totalisers displayed; one above and one
below the measured variable.

Figure 2-3.
Typical display of model 3491

Off-line/on-line status.
(Locked padlock = on-line)

Digital input status
(o = de-energized,

= energized)

Figure 2-4.
Typical display of model 3492

Transmitter allocated
Left vertical bar = Tx1
Right vertical bar = Tx2

Off-line/on-line status.
(Locked padlock = on-line)

HART Transmitter
communicating
(Absent if idle)

Bar graph of
4-20mA output

Measured PV
(Primary Value)

Transmitter
communicating
(1=Tx1, 2=Tx2)

Relay (RL) status.
(o = de-energized,

Relay (RL) status.
(o = de-energized,

= energized)

= energized)

Digital input status
(o = de-energized,

= energized)

Bar graph of
4-20mA output

Measured PV
(Primary Value)

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Rosemount 3490 Series

Figure 2-5.
Typical display of model 3493

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May 2007

Off-line/on-line status.
(Locked padlock = on-line)

Digital input status
o = de-energized,

= energized

Figure 2-6. Large PV Display

HART Transmitter
communicating
(Absent if idle)

Totaliser 1

After a period of keypad inactivity, the display automatically changes to the
Large PV Display. This shows only the Primary Value (PV) and Display units,
but in a larger character size to facilitate easier viewing.

To restore the Full Primary Display, press the red (ENTER) button.

NOTE:

If you do not require the Large PV Display feature, it can be switched off using
parameter P574. See also “Primary Display Options” on page 4-72

Large PV Display

Totaliser 2 (Daily total)

Measured PV
(Primary Value)

Relay (RL) status.
o = de-energized,
T = Totaliser

= energized

Status LED The LED is positioned just below the LCD. It flashes once per second to

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Full Primary Display

indicate that the Control Unit and Transmitters are operating correctly. If there
are operating system difficulties (e.g., overheating) or a transmitter fault, the
LED is constantly on.

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Rosemount 3490 Series

Section 3 Installation

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1

Before You Install . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-2

Mounting the Rosemount 3490 Series Control Unit . . . . page 3-3

Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-6

SAFETY MESSAGES Procedures and instructions in this section may require special precautions to

ensure the safety of the personnel performing the operations. Information that
raises potential safety issues is indicated by a warning symbol ( ). Please
refer to the following safety messages before performing an operation
preceded by this symbol.

Explosions could result in death or serious injury:

Verify that the operating environment is consistent with the appropriate locations
certifications (see Appendix B).

Do not remove the housing cover in explosive atmospheres when the circuit is alive.

Failure to follow safe installation and servicing guidelines could result in death or
serious injury:

Make sure only qualified personnel perform the installation.

Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment.

Do not perform any service other than those contained in this manual unless you are
qualified.

High voltage that may be present on leads could cause electrical shock:

Avoid contact with leads and terminals.

Make sure the main power to the Rosemount 3490 Series is off, and the lines to any
other external power source are disconnected or not powered while wiring.

www.rosemount.com

Reference Manual

00809-0100-4841, Rev. AA

Rosemount 3490 Series

May 2007

BEFORE YOU INSTALL The Rosemount 3490 Series Control Unit may be connected to a transmitter

located in a hazardous area. The Control Unit must not itself be located in a
hazardous area.

General considerations • Do not mount the Control Unit on a structure that is subject to vibration, or

in a position where damage may be caused by impact, thermal stress or
liquid ingress.

• The fuse must only be replaced with the type specified.

• If the equipment is likely to come into contact with aggressive substances,
it is the responsibility of the user to take suitable precautions that prevent
it from being adversely affected, thus ensuring that the type of protection
is not compromised.

Aggressive Substances - e.g. acidic liquids or gases that may attack
metals or solvents that may affect polymeric materials.

Suitable Precautions - e.g. regular checks as part of routine inspections or
establishing from the material's data sheet that it is resistant to specific
chemicals.

• The user should not repair this equipment.

• Terminal 30 (Intrinsically Safe Earth) of the Control Unit must be
connected to a High Integrity Earth.

• A mains powered Control Unit must not be connected to a supply
exceeding 250V r.m.s. or dc, or to apparatus containing a source of
voltage exceeding 250V r.m.s. or dc.

• A dc powered Control Unit must not be connected to a supply exceeding
30V dc, or to apparatus containing a source of voltage exceeding 30V dc.

• The Intrinsically Safe outputs of the Control Unit may be connected to
certified equipment used in a hazardous area. Refer to Appendix B for
details of relevant certifications.

• Refer to the technical data in Appendix A.

3-2

Reference Manual

00809-0100-4841, Rev. AA
May 2007

MOUNTING THE
ROSEMOUNT 3490
SERIES CONTROL UNIT

Rosemount 3490 Series

Mounting the IP-rated
Wall Mount Models

Mounting the
NEMA 4X-rated Wall
Mount Models

Guidelines:

• This housing is rated IP65. It is suitable for mounting outside, but this
should be above any flood level, away from any overflow path, and away
from direct sunlight.

• Do not mount the Control Unit on a structure that is subject to vibration, or
in a position where damage may be caused by impact, thermal stress, or
liquid ingress.

• The mass of the mains powered unit is 1.4 kg, and the DC powered unit is

1.0 kg. To conform with safety requirements, the wall on which the unit is
mounted should be capable of supporting 4 times this weight.

• It is not necessary, or advisable, to remove the upper part of the unit
housing that contains the LCD and keypad. There are no user serviceable
parts inside. The unit must not be modified in any way.

Procedure:

a) Mount the unit on a suitable wall or structure using the fixing points shown

on Figure A-1 in Appendix A.

b) For electrical connections, see “Electrical Connections on Wall Mount

Models“ on page 3-6.

Guidelines:

• This housing is rated NEMA 4X. It is suitable for mounting outside, but this
should be above any flood level, away from any overflow path, and away
from direct sunlight.

• Do not mount the 3490 Series Control Unit on a structure that is subject to
vibration, or in a position where damage may be caused by impact,
thermal stress, or liquid ingress.

• The mass of the mains powered unit is 3.5 kg, and the DC powered unit is

3.1 kg. To conform with safety requirements, the wall on which the unit is
mounted should be capable of supporting 4 times this weight.

• It is not necessary, or advisable, to remove the upper part of the unit
housing that contains the LCD and keypad. There are no user serviceable
parts inside. The unit must not be modified in any way.

• The 3490 Series Control Unit is not supplied with cable entries for
connections to the field mounted transmitter or the mains power supply.
Model 3493 has a download socket factory pre-fitted.

• It is the responsibility of the user to ensure that cable glands and
connection to the 3490 Series Control Unit are in accordance with the
local or national standards. To maintain the type 4X rating of the
enclosure, type 4X connections must be used.

Procedure:

a) Mount the unit on a suitable wall or structure using the fixing points shown

in Figure A-2 (Appendix A).

b) For electrical connections, see “Electrical Connections on Wall Mount

Models“ on page 3-6.

3-3

Rosemount 3490 Series

Mounting Panel Models Guidelines:

• This housing is rated IP40 and is designed for panel mounting in a
weatherproof environment. An optional fascia overlay hood is available
which improves the IP rating to IP65.

• Do not mount the Control Unit on a structure that is subject to vibration, or
in a position where damage may be caused by impact, thermal stress, or
liquid ingress.

• A rack mounting kit is available that allows mounting of the unit in a
standard 19-inch rack. Up to two units can be mounted in one rack; each
unit requires a rack mounting kit.

Where three of more units are fitted in the same cabinet or panel, ensure
that there is adequate air circulation to aid cooling. It is recommended that
an air circulation fan be fitted.

• The unit requires at least 165mm clearance behind the mounting panel to
avoid cable fouling.

• Once mounted, all wiring is made at the rear of the unit using the two part
terminal blocks provided. (On model 3493, a pre-wired data download
socket suitable for front panel mounting is provided with the unit.)

• Mount the control unit on a panel with thickness 1.5mm to 10mm,
ensuring the panel is strong enough to support the 1.2kg weight of the
control unit.

• Ensure there is enough clearance behind the chosen position in the panel
(165mm minimum), cut a slot 138mm long by 68mm high (i.e. landscape
or horizontal slot) in the panel and remove any rough edges.

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Procedure:

a) Unpack the two screw clips provided.

b) Identify the moulded lugs in the moulded recesses on each side of the

control unit. (Ignore the recesses on the top and bottom of the control
unit).

c) Holding the screwdriver-slot-end of the threaded spindle of a screw

clamp and looking at the rear of the control unit, locate the screw clamp
frame on the side of the control unit. See how the 4 steel lugs of the

screw clamp frame locate on the moulded lugs of the control unit.

d) Now gently pull the screw clamp such that the lugs engage with each

other (see Figure 3-1 on page 3-5).

e) Remove the screw clamps from both the screw clamp frames.

f) Slide the control unit into the panel, ensuring that the panel seal provided

is in place behind the front panel bezel.

g) Re-fit the screw clamps, one on each side, and tighten with a screwdriver

to clamp the control unit against the panel.

h) For electrical connections, see.“Electrical connections on Panel Mount

Model“ on page 3-8.

3-4

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Figure 3-1. Screw clamp fitted

Rosemount 3490 Series

Screw clamp frame

Front panel bezel

Screw clamp with
threaded spindle

3-5

Rosemount 3490 Series

ELECTRICAL
INSTALLATION

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Electrical Connections
on Wall Mount Models

All field wiring connections are accessible by removing the lower terminal
cover, which is secured by two screws on the IP-rated version, and by four
screws on the NEMA 4X rated version.

NOTE:

It is the responsibility of the installer to:

• Refer to safety data and electrical specifications in Appendix A.

• Refer to Product Certifications and Control Drawings in Appendix B

• Check and obtain any hazardous area work permits required before
applying power to the control unit.

• Observe all local regulations and approval requirements.

• Ensure the wiring is suitable for the load current.

• Ensure wiring insulation is suitable for the voltage, temperature, and
environment of the installation.

Never remove or modify the mechanical barriers separating the terminal area
from the main enclosure, and separating the transmitter input terminals from
other terminals.

Figure 3-2 shows the layout of the external connection terminals. All of the
terminal blocks are suitable for wires 14 to 26 AWG (0.5mm
except the mains terminals which are suitable for wires 10 AWG (2.5mm
Insulation should be stripped back

1

/4” (7mm).

2

to 1.5mm2),

2

).

NOTE:

For field wiring, use 167°F (75°C) copper conductors only.

Cable gland notes for IP-rated Wall Mount

Two cable glands, rated IP65 and suitable for cable with outside diameter
4mm to 7mm, are supplied for use with the mains supply and transmitter
cable. M20 blanking plugs are supplied for the other three cable entry
positions.

All glands and blanking plugs are supplied in a plastic bag. The installer must
fit these, or suitable equivalents, in place of the transit red-caps, to ensure
weatherproofing of the control unit.

Note that the white sealing washers supplied with the cable glands and
blanking plugs must be fitted on the outside of the enclosure under
gland/blanking plug.

It is the responsibility of the user to ensure suitable cable glands or conduit
connections are used when wiring to the control unit to maintain enclosure
integrity.

The five cable-entry positions are pre-drilled to accept M20 cable glands.
Model 3493 has a data download socket factory pre-fitted in one of these
cable-entry positions.

3-6

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Figure 3-2.
Connection terminals layout
(mains powered wall mount unit)

Rosemount 3490 Series

Cable gland and conduit notes for NEMA4X-rated Wall Mount

It is the responsibility of the user to ensure suitable cable glands or conduit
connections are used when wiring to the 3490 Series Control Unit to maintain
the enclosure integrity.

Protective earth cables must be connected to at least one of the bonding
points on the inside of the enclosure. Bonding between conduit entries is not
automatic and must be provided as part of the installation.

Model 3493 has a data download socket factory pre-fitted.

NOTE:

In Intrinsically Safe systems, apparatus connected to the 3490 Series Control
Unit must not be supplied from a voltage greater than 250V r.m.s. or 250V dc.

Table 3-1. Connection
descriptions for wall mount unit

456

1

2 3

24V

I

in

(DC powered version has slightly different layout i.e. terminals 31 and 32 replace terminals 28 and 29).

RX TX

0V

24V

789

10 11 12

1316141715

I

out

0V

NO COM NC

0VIN2IN1

18

NCCOMNO

1922202321

NO COM NC

24

NCCOMNO

25 26 27

NO COM NC

28

29 30

N

IS EARTH

FUSE 200mA (T)

L

Transmitter connections are on the left side of the terminals enclosure.

The Intrinsically Safe Earth (terminal 30) must be connected to a
High Integrity Earth if the transmitter connected to terminals 1 and 2 is sited in
a hazardous area.

Ter minal Function Layout

1 Loop supply 24V
2 Current input Iin
3 Cable screen Earth (Earth symbol)
4-6 RS232 RX-TX-0V
7-9 Current output 24V-Iout-0V
10-12 Digital input 1 and 2 IN1-IN2-0V
13-15 Relay 1 NO-COM-NC
16-18 Relay 2 NO-COM-NC
19-21 Relay 3 NO-COM-NC
22-24 Relay 4 NO-COM-NC
25-27 Relay 5 NO-COM-NC

(1)

28-29
30 I.S. Earth (Earth symbol)

(2)

31

(2)

32

(1) Mains powered control unit only.
(2) DC powered control unit only.

Mains input L-N

Negative ­Positive +

3-7

Rosemount 3490 Series

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Electrical connections
on Panel Mount Model

Figure 3-3.
Connection terminal layout
(mains powered panel unit)

All connections are made to the rear of the control unit using the two part
terminal connectors provided.

NOTE

It is the responsibility of the installer to:

• Refer to safety data and electrical specifications in Appendix A.

• Refer to Product Certifications and Control Drawings in Appendix B

• Observe all local regulations and approval requirements.

• Check and obtain any hazardous area work permits required before
applying power to the control unit.

• Ensure the wiring is suitable for the load current.

• Ensure wiring insulation is suitable for the voltage, temperature, and
environment of the installation.

Table 3-2. Connection
descriptions for panel mount unit

3-8

(DC powered version has slightly different layout i.e. terminals 31 and 32 replace terminals 28 and 29).

Transmitter connections are on the left side of the terminals enclosure.

The Intrinsically Safe Earth (terminal 30) must be connected to a
High Integrity Earth if the transmitter connected to terminals 1 and 2 is sited in
a hazardous area.

Ter minal Function Layout

1 Loop supply 24V
2 Current input Iin
3 Cable screen Earth (Earth symbol)
4-6 RS232 RX-TX-0V
7-9 Current output 24V-Iout-0V
10-12 Digital input 1 and 2 IN1-IN2-0V
13-15 Relay 1 NO-COM-NC
16-18 Relay 2 NO-COM-NC
19-21 Relay 3 NO-COM-NC
22-24 Relay 4 NO-COM-NC
25-27 Relay 5 NO-COM-NC

(1)

28-29

Mains input L-N

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Ter minal Function Layout

30 I.S. Earth (Earth symbol)

(2)

31

(2)

32

(1) Mains powered control unit only.
(2) DC powered control unit only.

Negative ­Positive +

Transmitter Connections
and Cabling

Connection of a transmitter to the control unit does not confer Intrinsic Safety
on the transmitter. It is the responsibility of the user to ensure any transmitter
installed in a hazardous area is suitable for use and certified accordingly. The
installation should be in accordance with a recognised code of practice.

Check the parameters of the installed system of control unit, transmitter, any
loop-powered devices, and interconnecting cable to ensure compliance with
the product certificates and technical data (Appendix A and Appendix B).

Particular attention must be given to the cable and the transmitter to ensure
that the total capacitance and inductance limits stated in the technical data in
Appendix B are not exceeded.

Cable joins are allowable in cabling the transmitter, provided that the joint is
made within an IP20/NEMA 3 (minimum) enclosure suitable for the
environment, and that wiring withstands a test voltage of 500V r.m.s. to earth.

The maximum length of cable permissible between the transmitter and control
unit is determined by limits imposed by the Intrinsic Safety certificates of the
instruments and Control Drawings.

No other outputs from the control unit must be routed through a hazardous
area unless protected by an additional I.S. Barrier (not supplied).

It is the responsibility of the user to ensure that any transmitter is installed in
accordance with the manufacturer’s instructions supplied with the transmitter.

Cable between the 3490 Series Control Unit and the transmitter should be
shielded twisted-pair with the shield connected to terminal 3 (marked with
earth symbol) on the 3490 Series Control Unit. The shield should be left
unconnected at the transmitter unless there is a terminal specifically provided
for this purpose.

Figure 3-4.
Loop-powered transmitter
connections to 3490 Series
Control Unit

Cable runs should be separate from any high voltage or mains cables to avoid
crosstalk or interference.

Multi-core cable may be used, provided that other cores carry only low
voltage (24V dc nominal) signals and each pair of cores is individually
shielded.

Loop-powered transmitters must be connected to terminals 1 - 3 (Figure 3-4).

(Control Unit)

24V
Iin

2

(Transmitter)

1

3

The 3490 Series Control Unit is able to provide 24V dc to a transmitter with a
max load of 25mA. Separately powered transmitters must be connected to
terminals 2 - 3 as shown in Figure 3-5

3-9

Rosemount 3490 Series

Figure 3-5.
self-powered transmitter
connections to 3490 Series
Control Unit

NOTE:

The plug/socket connectors are polarized to prevent inter-changeability and
incorrect connection

(Control Unit)

24V
Iin

Reference Manual

00809-0100-4841, Rev. AA

May 2007

1
2

(Transmitter)

3

Connecting HART
Transmitters to 3492

Figure 3-6. Connecting HART
transmitters to 3492

Model 3492 of the Rosemount 3490 Series takes the input from two HART
transmitters and will perform various calculations to create the sum,
difference, or product of the two inputs.

NOTE

The transmitters must be HART compatible for the 3492 to operate correctly.

Connection of the transmitters to the 3492 may be by cabling both transmitter
cables into the 3492 (Figure 3-6), or may be on a single cable with the two
transmitters connected to this cable via a suitable junction box (Figure 3-6).

Junction

Tx1

1
2
3

1
2
3

Box

Tx2

For correct operation, each transmitter must be changed to “multi-drop” mode
so that they can communicate with the 3492 through a common connection.
Each transmitter must therefore have it’s poll address changed from the
factory default address of “0” to a unique address.

Tx1

Tx2

3-10

The 3492 is used to achieve this address change, but requires the
transmitters be connected in a specific sequence as detailed here:

a) With the power supply turned off, connect the first transmitter to

terminals 1-3 on the 3492.

b) Check that the power-selector-switch is set for the correct voltage

(115 or 230V ac) on the mains unit, and then turn the power on.

c) The 3492 will detect the transmitter and automatically change the poll

address of the transmitter from “0” to “1”. This transmitter will also be
automatically allocated to Channel 1 of the 3492.

Note that the 3492 may also offer the user the opportunity to set the
Bottom Reference of the transmitter at this point, which may be done or
ignored by pressing the ESC button.

Reference Manual

00809-0100-4841, Rev. AA
May 2007

d) Turn the power supply off and connect the second transmitter, either at

the same terminals 1-3 as the first transmitter or at the junction box, such
that both transmitters are now connected.

e) Turn the power supply on. The 3492 will once again search for and detect

connected transmitters. After the second transmitter is found, the 3492
will automatically change the poll address from “0” to “2”. The second
transmitter will also be automatically allocated to Channel 2 of the 3492.

Note that the 3492 may also offer the user the opportunity to set the
Bottom Reference of the transmitter at this point, which may be done or
ignored by press the ESC button.

Rosemount 3490 Series

Power Connections If the 3490 Series Control Unit is powered by mains AC power, select the AC

voltage as 115V or 230V using the voltage-selector slide switch.

If the 3490 Series Control Unit is DC powered, ensure the supply is adequate
(15 - 30V dc). Do not exceed 30V dc.

A switch or circuit breaker should be installed in close proximity to the
instrument, and labelled as such.

Although the 3490 Series Control Unit meets all European standards for
surge immunity on power and signal lines, it is recommended that lightning
suppressors, such as made by Telematic Limited, are fitted if local conditions
make this advisable.

Earthing Connections The IP-rated Rosemount 3490 Series of Control Units are double insulated

and DO NOT require a mains earth.

DO NOT connect a mains earth to terminal 30.

Terminal 30 is provided for use as an Intrinsically Safe (or functional) earth
connection, which MUST be used when a transmitter is mounted in a
hazardous area and is connected to terminals 1 and 2.

Terminal 3 is to be used for connection of the shield of the twisted-pair
transmitter cable when the 3490 Series Control Unit is powering the
transmitter (as in Figure 3-4 on page 3-9). Note that this shield should be left
unconnected at the transmitter end unless there is a terminal provided for this
purpose.

On the NEMA4X-rated Control Unit, protective earth cables must be
connected to at least one of the bonding points on the inside of the enclosure.
Bonding between conduit entries is not automatic and must be provided as
part of the installation.

When connected to equipment located in a hazardous area, not meeting the
requirements of clause 6.3.12 (Isolation of circuits from earth or frame) in IEC
60079-11:2006 (EN 60079-11:2007), equipotential earthing must be ensured
between the equipment and the intrinsically safe earth. An example of
equipotential earthing is a cable with a cross sectional area greater than

2

4mm

and a resistance of less than 1ohm.

3-11

Reference Manual

00809-0100-4841, Rev. AA

Rosemount 3490 Series

May 2007

Relay Connections The 5 voltage-free contact relays are grouped in the following configuration:

Table 3-3.
Relay configuration groups

3490 Series Control Unit (Wall Mount) 3490 Series Control Unit (Panel Mount)

Relay 1 and 2 : Group 1 Relay 1, 2 and 3 : Group 1
Relay 3 and 4 : Group 2 Relay 4 and 5 : Group 2
Relay 5 - Group 3

The relay NO-COM-NC labels represent the relay terminals in the
de-energised state.

NOTE:

Whilst each relay is individually double-insulated, their arrangement is such
that the insulation between relays in the same group is standard or ‘basic’
insulation.

NOTE:
Care must be taken in order to avoid the risk of electric shock. It is

allowed to use relays in the same group to control circuits with both mains and
dc, or low voltage circuits.

Current Output
Connections

Figure 3-7.
Alternative Current Output
configurations

Digital Control Voltage
free Contact Inputs

Figure 3-8. Connections for
external trigger input

The Current Output may be connected in internally-powered mode or
loop-powered mode, as shown in Figure 3-7.

In loop-powered mode, an external power source is required. A minimum of

2.5V is required across terminals 7 and 8 for correct operation. The external

voltage must not be more than 30V dc.

24V

7

Io

8

0V

9

Internally Powered Loop Powered

+

Load

-

24V

0V

7

+

External
Supply

Io

8

+

Load

-

-

9

There are 2 trigger inputs, IN1 and IN2. The digital trigger input is connected
as shown in Figure 3-8.

3-12

External
Contact
Closure

IN

or10 11

0V

12

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

RS232 Connections The RS232 connections, terminals 4-6, may be used for exchanging data with

a PC or a handheld device.

Model 3493 is supplied with a data-download socket. Connect the
flying leads from the socket provided as follows:

• 4 - white (RX)

• 5 - Red (TX)

• 6 - Black (0V)

3-13

Rosemount 3490 Series

Reference Manual

00809-0100-4841, Rev. AA

May 2007

3-14

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Section 4 Getting started

Safety messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-2

Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-3

The Hierarchical menu system . . . . . . . . . . . . . . . . . . . . . page 4-5

Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4-9

SAFETY MESSAGES Procedures and instructions in this section may require special precautions to

ensure the safety of the personnel performing the operations. Information that
raises potential safety issues is indicated by a warning symbol ( ). Refer to
the safety messages listed at the beginning of each section before performing
an operation preceded by this symbol.

Explosions could result in death or serious injury:

Verify that the operating environment of the 3490 Series Control Unit is consistent with
the appropriate hazardous locations certifications.

Failure to follow safe installation and servicing guidelines could result in death or
serious injury:

Make sure only qualified personnel perform the installation.

Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment.

Do not perform any service other than those contained in this manual unless you are
qualified.

4-1

Rosemount 3490 Series

SWITCHING ON

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Switching on the
3491/3493

Figure 4-1. 3490 Series Control
Unit with 1 transmitter

The Rosemount 3490 Series Control Unit takes the input from a HART
transmitter or 4-20mA transmitter.

3491 and 3493 support level, content and flow measurements. 3493 software
has data logging support.

After completing the installation of both 3490 Series Control Unit and
transmitter, apply power to the 3490 Series Control Unit.

The factory default is for the 3490 Series Control Unit to automatically locate a
HART compatible transmitter, which may have any polling address in the
range 0 to 15.

NOTE:

If a transmitter is not connected, the Primary Display will appear after a few
seconds, but showing a PV of zero.

If a 4-20mA transmitter is connected, the 3490 Series Control Unit will poll up
to address 15, and then report that no transmitter was found. The Primary
Display will appear after a few seconds, but showing a PV of zero. It is then
necessary to configure the 3490 Series Control Unit for a 4-20mA input
instead of a digital input. See Section “Transmitter inputs to the 3490“ on
page 4-13 for details of this procedure.

A HART transmitter will normally be located within 30 - 40 seconds. When
found, it will automatically be designated Ch1 (Transmitter #1) and
automatically assigned to 3490’s Channel 1.

However, unless the poll address was zero (factory default), prompts then
appear for changing the poll address and the tag name; this is optional and
pressing the red (ENTER) button will continue to start-up process. During this
time, the 3490 Series Control Unit will read parameters from a HART
transmitter and make them available within the hierarchical menu system.

4-2

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

NOTE:

If being used for the first time with a Rosemount 3100 Series transmitter, there
will be a prompt for the Bottom Reference of the transmitter. This value will
then be used to automatically set-up the transmitter 4-20mA output span over
this range.
If you do not want to commission the system now, simply switch off the power
and the same prompt will re-appear when switching on the next time.
If you are commissioning the system now, edit the Bottom Reference with the
arrow buttons and then press the red (ENTER) button to confirm the
programmed value. The Bottom Reference can be changed at a later stage,
but it is better to get it correct now. If you press the ESC button, the start-up
process will continue and the Bottom Reference prompt will re-appear when
switching on the next time.

After the start-up process is complete, the Primary Display appears showing a
measurement e.g. depth of the liquid in the tank. The value on the Primary
Display is the 3490’s PV (Primary Variable).

Whenever the 3490 Series Control Unit is switched off and then on, it will
re-establish digital communications with the HART transmitter and then the
Primary Display will appear.

Continue with a tour of the hierarchical menu system on page 4-5, or turn to
the Section “Programming“ on page 4-9.

Switching-on the 3492 Model 3492 of the Rosemount 3490 Series Control Units takes the input from

two HART transmitters and will perform various calculations to create a single
sum, difference or product of the two inputs.

Figure 4-2.
3492 and two HART transmitters

It is important to connect the two HART transmitters in the correct sequence,
as detailed in “Connecting HART Transmitters to 3492“ on page 3-10.

After both HART transmitters are connected, the top-left corner shows
communications with both transmitters by alternating "1" and "2" next to the
digital communications icon.

The actual PV shown on the display remains that of Tx1, which is the factory
default condition. You will be able to change this to another value, usually the
sum, difference or product of the two transmitter readings at a later stage.

4-3

Rosemount 3490 Series

THE HIERARCHICAL
MENU SYSTEM

Reference Manual

00809-0100-4841, Rev. AA

May 2007

How to navigate the
menu system

Figure 4-3.
How to enter the menu system

If you wish to have a quick tour of the menu system, follow instructions in this
section, otherwise feel free to explore on your own. Should you get lost, use
the ESC button repeatedly until the primary display re-appears.

Tour of menu system:

1. Ensure that the Primary Display (or Large PV Display) is visible.

If you are already within the menu system, hold down the ESC button for
5 seconds, and then continue with Step 3.

2. Press the red (ENTER) button once to display the MAIN MENU

(see Figure 4-3). The MAIN MENU is the top level of the menu system.

3. Navigation of the menu system is achieved by using the ARROW buttons,

the red (ENTER) button, and the ESC button. The ESC button returns you
to the previous menu level, unless you are at the top level.

4. The highlighted (blinking) text indicates what menu option will be selected

if the red (ENTER) button was pressed now. Do not press it yet.

Figure 4-4. How to navigate the
menu system

4-4

(Do not worry if the menu option is "Go Off-line" instead of "Go On-line".)

5. The

6. Now use the UP-ARROW button to highlight menu option "Go On-line?"

7. Press the red (ENTER) button once to select it.

8. Use the red (ENTER) button to toggle between on-line and off-line modes

↓ indicates there are further menu options available, accessible by

using the DOWN-ARROW button.

An

↑ indicates there are further menu options available, accessible by

using the UP-ARROW button.

(or "Go Off-line?").

(see Figure 4-5).

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May 2007

Figure 4-5. Toggling operating
modes “On-line” and “Off-line”

Rosemount 3490 Series

Operating modes "On-line" and "off-line" affect outputs on the 3490 Series
Control Unit (see section “Modes of operation“ on page 4-11).

If the 3490 Series Control Unit is configured and outputs are
connected up to equipment e.g. a pump, use caution!

9. With the screen displaying "Go On-line?" on the top line, press the

ESC button once to exit to this menu.

10. The MAIN MENU sits above a series of sub-menus, which lead to further

levels of sub-menus that lead to parameter screens (see Figure 4-6).

Figure 4-6.
MAIN MENU Overview

Pressing the red (ENTER) button toggles the operating mode
of the 3490 Series Control Unit. An open padlock indicates
that the unit is off-line and parameter values can be changed.

Selecting this will bring up the "Set-up" menu for
programming the 3490 Series Control Unit.
For a menu map, see Appendix C.

Selecting this will bring up the "Set-up" menu for
optional HART transmitter (Tx1) programming.
(Similarly for Tx2 on model 3492.)
The transmitter Bottom Reference can be
changed here.
For a menu map, see Appendix C.

Selecting this will allow you to monitor live readings
and diagnostic information for the 3490 Series
Control Unit. For a menu map, see Appendix C.

Direct access menu for advanced users
to select parameter screens.
For a guide to this, see Appendix D.

Selecting this will allow you to monitor live readings
and diagnostic information from the HART
transmitter, Tx1. (Similarly for Tx2 on model 3492.)
For a menu map, see Appendix C.

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11. Within the menus, there are also parameter screens for programming -

setting-up for an application, adjusting default settings, etc. - and screens
for displaying read-only information.

Figure 4-7.
Example of a parameter screen

May 2007

About parameter screens To understand how to edit a parameter, such as the calendar date, follow the

instructions in this section, otherwise feel free to continue to “Programming“
on page 4-9.

Figure 4-8.
Parameter Screen (View Mode)

Figure 4-9.
Parameter Screen (Edit Mode)

1. Navigate to the "Date" parameter screen (see Figure 4-7).

2. Upon entering a parameter screen, it is always in View Mode (Figure 4-8).

3. Guidance for what to do now is on the display line 4. In View Mode, the

ESC button returns you to the menu.

4. To enter Edit Mode, press the red (ENTER) button as guided on display

line 4.

The “0” is highlighted to show this digit can now be edited (Figure 4-9).
Also, note that on display line 4, "Edit" has changed to be "Save".

You can press the ESC button at any time to quit editing and return to
View Mode. This will also restore the original setting.

4-6

5. Press the RIGHT-ARROW button once to highlight the “5”.

If you go too far to the right, use the LEFT-ARROW button to move the
highlight back to the “5”.

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May 2007

Figure 4-10.
Changed the “5” to a “6”

Rosemount 3490 Series

6. Press the UP-ARROW button once to change the 5 to a 6.

The UP-ARROW button will scroll up through the numbers.

The DOWN-ARROW button will scroll down through the numbers.

7. Press the RIGHT-ARROW button until the “2” is highlighted.

If you go too far to the right, continue to use the RIGHT-ARROW button.

8. Press the UP-ARROW button once to change the “2” to a “3”.

If you go beyond the 3, use the DOWN-ARROW button to decrease the
number. Alternatively, keep using the UP-ARROW button.

Figure 4-11.
Changed the “2” to a “3”

Figure 4-12. New date saved

9. Press the red (ENTER) button to save the new date and return to View

Mode.

Note that on display line 4, "Save" has changed back to "Edit".

10. Press the ESC button to return to the SETTINGS menu.

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Rosemount 3490 Series

May 2007

PROGRAMMING

Before you begin Before embarking on programming (configuring) the 3490 Series Control Unit,

it is recommended that you have a working knowledge of important features
and programming philosophies.

All setting up is achieved from the front panel of the 3490 Series Control Unit;
this includes optional adjustments to the set-up of a HART transmitter.

Parameters

The 3490 Series Control Unit has menu-based parameters for programming ­setting up for an application, adjusting default settings, etc. - and for viewing
information.

Parameters are populated throughout the menu system. They are grouped in
sub-menus, which are organised by association with a specific function or
application. Each parameter has a unique 3-digit identification number,
prefixed by a 'P' - if programmable - or a 'D' - if for display purposes only. Full
menu maps are provided in Appendix C.

With some experience, it becomes easy to locate parameters. Alternatively,
parameters can be accessed directly by knowing their unique 3-digit
identification number. (See Appendix D for details.)

To make programming of functions and applications easier, various Wizards
are provided - See “Wizards“ on page 4-10.

Menu Navigation

In this chapter, a simple notation has been used to guide you to a particular
menu screen or parameter screen. This avoids the need for detailed
navigation instructions.

Consider the navigation instructions to be followed before arriving at the
DIRECT menu. For the purpose of this example, the starting point is the
primary display.

In the notation form this is simply:

1. Navigate to MAIN MENU / DIRECT

Without the notation, this translates into these instructions:

1. Press the red (ENTER) button to display the "MAIN MENU" screen.

2. Press the DOWN-ARROW button repeatedly until "DIRECT" is blinking.

3. Press the red (ENTER) button once.

If square brackets are used in a part of the menu notation, e.g. MAIN MENU /
SETUP / [CONTROL UNIT], it signifies that the bracketed menu does not
appear in all circumstances.

Typically, if there are no HART transmitters, the "SELECT INSTRUMENT"
screen will never appear as there is no need to differentiate between
3490 Series Control Unit and HART transmitter; the menu that appears then
is for the 3490 Series Control Unit.

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May 2007

Figure 4-13.
Navigating to the DIRECT menu

Rosemount 3490 Series

Wizards

Programming is best achieved through easy-to-follow Wizards. They are
simply a sequence of on-screen prompts, allowing you to easily set-up an
individual function or a large application without fuss.

There is a collection of Wizards for most functions and applications. They are
selected and started through the menu system. Look out for how to use these
Wizards in later sections.

Wizard hints:

• Display line 4 normally instructs what will occur when pressing the ESC
button and red (ENTER) button.

• Arrow buttons scroll through multiple-choice options and edit values.

• The red (ENTER) button confirms an edited option/value and then
displays the next prompt.

Approach to setting-up

To make setting-up straightforward, proceed in a structured manner:

First Step:

Put the 3490 Series Control Unit off-line (see Modes of operation below). The
factory default is for it to be on-line.

Comfort settings:

This includes how to switch off the keyboard sound, setting the date/time, and
changing language - see Section “Comfort (system) settings“ on page 4-12.

Inputs:

This includes setting-up the Input Channels to obtain PV (Primary Variable)
values from a transmitter. Also, includes how to allocate actions to digital
inputs (IN1 and IN2) - see Sections “Transmitter inputs to the 3490“ on
page 4-13 and “Digital Inputs IN1 and IN2“ on page 4-34.

Application:

This includes further processing of PV values to get content (volume) and flow
rate values, which can be shown on the Primary Display - see Section “Profile
Calculations for Contents and Flow Applications“ on page 4-24.

In addition, a totaliser function can be set-up.

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Rosemount 3490 Series

Outputs:

This includes setting-up:

• 4-20mA Current Output (see Section “Current Output“ on page 4-39).

• Relays (see “Relays“ on page 4-40).

Other features:

This includes configuring Data Logging, Alarm handling, the Primary Display,
Serial Communications and Pin Security.

Final Step:

Put the 3490 Series Control Unit on-line (see “Modes of operation”, below).
For checks (e.g. Auto-Cycle), diagnostics and faultfinding, see
Section 5: Service and Health Checks.

Modes of operation

There are two operating modes: on-line and off-line.

Figure 4-14. How to toggle
between on-line and off-line

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May 2007

An open padlock icon indicates the 3490 Series Control Unit is presently in
the off-line mode. In this mode, the unit can be programmed providing that
you know the security PIN (if set-up). Additionally, the 4-20mA output is frozen
and all relays are frozen unless allocated to totalising and sampler duties.
Fault relays are de-energized.

A closed padlock icon indicates that the 3490 Series Control Unit is presently
in the on-line mode. In this mode, most of the unit cannot be programmed.
However, you will be prompted to go off-line if you attempt to programme
whilst in this mode and providing that you know the security PIN (if set-up).
Additionally, the 4-20mA output and all relays are enabled.

Unit Security

By default, security restrictions are switched off and the user has access to all
set-up parameters. Once programming is complete, a PIN security code can
be used to prevent unauthorised access.

For details, refer to Section “PIN Security“ on page 4-75.

If you get into difficulties…

There is trouble-shooting information in Section 5: Service and Health
Checks. Alternatively, the 3490 Series Control Unit can be re-set to the factory
defaults as guided in the Section “Restoring the factory defaults“ on page D-1.

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Rosemount 3490 Series

Comfort (system)
settings

Prior to setting up, it is advisable to check the settings of these parameters
and, if necessary, make changes. This includes setting the time and date,
switching off the keypad sound and changing language.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] SYSTEM / SETTINGS

Setting the real-time clock

P730 Date

The date format is determined by P734.

P731 Time

The 24-hour clock format is supported.

P734 Date format (Default setting is "dd/mm/yy")

Choose between "dd/mm/yy", "yy/mm/dd" and "mm/dd/yy".

Keypad Sound

P735 Keypad Sound (Default setting is "On")

If you want the keypad sound switched off, select "Off" from the
multiple-choice list.

Language

P737 Language (Default setting is "English")

If you wish to change the language used on-screen, there is a choice of other
languages.

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Rosemount 3490 Series

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May 2007

Transmitter inputs
to the 3490

This section explains the operation of the 3490’s input channels.

NOTE:

If using the "Duty" wizard to set-up the 3490 Series Control Unit, the wizard
will automatically calculate and populate all necessary parameters of the input
channels, and so you proceed to the Section “Digital Inputs IN1 and IN2“ on
page 4-34.

On this page, follow the guidance for the particular model of the 3490 Series
Control Unit that you have e.g. model 3491. You will be directed to the
sections that are appropriate for your particular system.

NOTE:

If you want to edit or view parameters (e.g. Bottom Reference) of a
Rosemount 3100 Series transmitter, it is recommended you refer to the
transmitter manual. See also “Health Check: Rosemount 3102/3105 Series
transmitters“ on page 5-8 and Appendix C of this manual.

Models 3491 or 3493

If you have model 3491 or model 3493, there is support for one transmitter
connection. Consequently, there is one input channel named
Input Channel 1.

In Table 4-1, identify the type of transmitter connected and refer to the
corresponding sections.

Table 4-1. Transmitter options
for models 3491 and 3493

Table 4-2. Transmitter options
for model 3492

Transmitter 1 Instructions

4-20mA "Set-up Input Channel 1 as guided on page 4-14.
HART "Set-up Input Channel 1 as guided on page 4-20

Model 3492

If you have model 3492, there is support for two HART transmitters, but not
two 4-20mA transmitters. Consequently, there are two channels and they are
named Input Channel 1 and Input Channel 2.

Transmitter 1 Transmitter 2 Instructions

4-20mA (Not allowed) Set-up Input Channel 1 using Section “Setting up Input

Channel 1 for a 4-20mA input“ on page 4-14

HART HART Set-up Channels 1-2 using Sections “Setting up Input

Channel 1 for a HART input“ on page 4-20.and
“Setting up Channel 2 for a HART input (Model 3492
only)“ on page 4-22

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Rosemount 3490 Series

Setting up Input Channel 1 for a 4-20mA input

This section is applicable if a transmitter with a 4-20mA output is connected.
Models 3491 and 3493 support the connection of a single 4-20mA transmitter
Do not connect a second 4-20mA transmitter.

It is important at this stage to ensure that the units of the 3490’s PV are set
correctly. Navigate now to parameter P200 and select the required units.

NOTE:

The "Duty" Wizard is recommended for configuring an application after P111
is configured.
Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

To configure parameter P111 for analogue measurements, do the following:

1. Navigate to the Ch1 I/P Source menu for parameter P111.

2. Select "mA in 1" from the option list.

Figure 4-15 on page 4-15 illustrates an overview of the data flow through
Input Channel 1.

Analog measurements are presented to the 3490 Series Control Unit as a
4-20mA signal (mA input), and pass through a conditioning (to remove spikes)
and damping stage. The mA input damping can be set using P321.

The signal is then checked to ensure it is within the expected range (3.7mA to

20.75mA). Signals outside this range cause an alarm condition, which may be

externally signalled using a 3490 Series Control Unit relay - see P545 in
Section “Alarm indication selection“ on page 4-60.

By default, the mA signal (readable on D840) is normalised into a percentage
in the range 0 - 100% (readable on D842), where 4mA is 0% and 20mA is
100% (although in practise the 3490 Series Control Unit can process mA
input values in the range 3.8mA to 20.5mA (-1.25% to +103.125%).

P112 is a +ve or -ve % input offset for optimal adjustment of the normalised
percentage i.e. D802 = D842 + P112. As an example, this feature may be
used to accommodate a standing value of level in a tank. The output is
readable on D802 and is the Tertiary Value (TV) of the 3490.

P114 is not applied when the PV units (see P200) are configured to be "%" i.e.
D801 = D802.

If the 3490’s PV units have been changed from a percentage (see P200), the
4-20mA signal is still normalised into a percentage as shown on D802.
However, a value entered into P114 will change the signal from a % value to a
new scaled value, typically in level units where:

D801 = (D802/100) * P114

The value of D801 is the Secondary Value (SV) of the 3490.

The level measurement can be converted into a content (or flow)
measurement using a selected profile calculation (P113). The programming
for various supported profiles can be found in Section “Profile Calculations for
Contents and Flow Applications“ on page 4-24.

P117 is a low cut-off parameter that allows the user to force channel 1 output
(D851) to be zero when the calculated value falls below a user defined value:

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Rosemount 3490 Series

Table 4-3. P117 Options

P117 Channel 1 Output Action

+ve value Drop immediately to zero.
None Continue measuring.

0.0 Hold output at zero.

-ve value Rise immediately to zero.

This feature is particularly useful in an Open Channel Flow application (OCF)
where a small standing or remaining liquid level in the channel would cause
continued totalising of flow when no actual flow exists. For example, set P117
to a +ve (positive) value of flow units, usually around 2% of maximum flow, to
overcome this problem.

P210 allows the user to apply damping to the calculated value of D851.

The final output of Input Channel 1 is readable on D800 and is the PV of the
3490 Series Control Unit, which is shown on the factory default display.

Figure 4-15. 4-20mA Txr Input
Blocks and Parameters (Ch. 1)

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May 2007

P111 = “mA in”

mA Input

P321

Conditioning

and damping

Channel

Profile
Select

P113

<3.7mA

mA mA

4-20mA Limit
Alarm Check

>20.75mA

Scaled

Profiles

P115 P116

Non-Linear Profile Post Scale NLP

Notes:

Optional damping of mA readings:
mA = [mA_before + ((mAnow - mA_before)/(1+10 * P321))], @ 10Hz.

P111 Channel 1 Input Source
Select "mA In 1" from list of options. (All other options are for HART.)

P112 Channel 1 input Offset
Use for optional adjustment to the D842 value.

D840

mA

Normalise

mA to %

P111

%%

D842

Input

Source

Select

P112

(CH1 O/P)

D851

(TV)

D802

PV

Damping

P210

%%%

Apply

Input

Offset

Low
Cut-off
Check

P117

P114

Apply

Input

Scaling

(SV)

D801

(PV)
D800

4-14

P113 Channel 1 profile selection. Keep the "Scaled" option unless requiring a
profile calculation (see “Profile Calculations for Contents and Flow
Applications“ on page 4-24)

P114 Channel 1 Scaling Factor
This is for scaling the D802 value into required units (P200).

If PV value is liquid level, set P114 to the level measurement represented by
the 20mA output from transmitter.

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P117 Channel 1 Low Cut-off
Use for forcing D800 to zero while D851 is less than P117

P20x Displayed measurement units
P200 for PV (D800), P201 for SV (D801) and P202 for TV (D802)

P210 Optional damping of MCU PV (at 10 Hz)
Using D800 = [D800_before + ((D800_now - D800_before)/(1+10 * P210))]

For use of P115 and P116, refer to Section “Profile Calculations for Contents
and Flow Applications“ on page 4-24.

D800 is the PV (Process Variable) value of the 3490 Series Control Unit.

D801, D802, D840 and D842 are intermediate results. (They are useful for
trouble-shooting - see “Service and Health Checks“ on page 5-1.)

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Rosemount 3490 Series

Setting up Input Channel 2 for a 4-20mA input (model 3492 only)

Model 3492 supports the connection of a single 4-20mA transmitter. Do not
connect a second 4-20mA transmitter.

This section is applicable if a transmitter with a 4-20mA output is connected
and supplying the same analog measurements to both input channels; this
may be appropriate in some applications, perhaps where an offset is used.

It is important at this stage to ensure that the units of the 3490’s PV are set
correctly. Navigate now to P200 and select the required units.

NOTE:

The "Duty" Wizard is recommended for configuring an application after P121
is configured.
Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

To configure parameter P121 for analogue measurements, do the following:

1. Navigate to the Ch2 I/P Source menu for parameter P121.

2. Select "mA in 1" from the option list.

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May 2007

Figure 4-16 on page 4-18 illustrates an overview of the data flow through
Input Channel 2.

Analogue measurements are presented to the 3490 Series Control Unit as a
4-20mA signal (mA input), and pass through a conditioning (to remove spikes)
and damping stage. The mA input damping can be set using P321.

The signal is then checked to ensure it is within the expected range (3.7mA to

20.75mA). Signals outside this range cause an alarm condition, which may be
externally signalled using the 3490’s relay - see P545 in Section “Alarm
indication selection“ on page 4-60.

By default, the mA signal (readable on D840) is normalised into a percentage
in the range 0 - 100% (readable on D842), where 4mA is 0% and 20mA is
100% (although in practise the 3490 Series Control Unit can process mA
input values in the range 3.8mA to 20.5mA (-1.25% to +103.125%).

P122 is a +ve or -ve % input offset for optimal adjustment of the normalised
percentage i.e. D802 = D842 + P122. As an example, this feature may be
used to accommodate a standing value of level in a tank. The output is
readable on D802 and is the Tertiary Value (TV) of the 3490 Series Control
Unit.

P124 is not applied when the PV units (see P200) are configured to be "%"
i.e. D801 = D802.

If the 3490’s PV units have been changed from a percentage (see P200), the
4-20mA signal is still normalised into a percentage as shown on D802.
However, a value entered into P124 will change the signal from a % value to a
new scaled value, typically in level units where:

4-16

D801 = (D802/100) * P124

D801 is the Secondary Value (SV) of the 3490 Series Control Unit.

The level measurement can be converted into a content (or flow)
measurement by using a selected profile calculation (P123). The
programming for various supported profiles can be found in Section “Profile
Calculations for Contents and Flow Applications“ on page 4-24.

Reference Manual

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May 2007

Table 4-4. P127 Options

Rosemount 3490 Series

P127 is a low cut-off parameter that allows the user to force the channel 2
output (D852) to be zero when the calculated value falls below a user defined
value:

P127 Channel 2 Output Action

+ve value Drop immediately to zero.
None Continue measuring.

0.0 Hold output at zero.

-ve value Rise immediately to zero.

This feature is particularly useful in an Open Channel Flow application (OCF)
where a small standing or remaining liquid level in the channel would cause
continued totalising of flow when no actual flow exists. For example, set P127
to a +ve (positive) value of flow units, usually around 2% of maximum flow, to
overcome this problem.

P210 allows the user to apply damping to the calculated value of D852.

The final output of Channel 2 is readable on D800 and is the 3490’s second
PV, which is not shown on the factory default display.

Figure 4-16. 4-20mA Txr Input
Blocks and Parameters (Ch. 2)

P121 = “mA in”

mA Input

P321

Conditioning

and damping

Channel

Profile
Select

P123

<3.7mA

mA mA

4-20mA Limit
Alarm Check

>20.75mA

Scaled

Profiles

mA

D840

P125 P126

Non-Linear Profile Post Scale NLP

Normalise

mA to %

%%

D842

P121

Input

Source

Select

P122

(CH2 O/P)

D852

(TV)

D802

PV

Damping

P210

%%%

Apply

Input

Offset

Low
Cut-off
Check

P127

P124

Apply

Input

Scaling

(SV)

D801

(PV)
D800

Notes:

Optional damping of mA readings:
mA = [mAbefore + ((mAnow - mAbefore)/(1+10 * P321))], ten times a second

P121 Channel 2 Input Source
Select "mA In 1" from list of options. (All other options are for HART.)

P122 Channel 2 Input Offset
Use for optional adjustment to the D842 value.

P123 Channel 2 Profile Selection
Keep the "Scaled" option unless requiring a profile calculation (see Section
“Profile Calculations for Contents and Flow Applications“ on page 4-24.)

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Rosemount 3490 Series

P124 Channel 2 Scaling Factor
This is for scaling the D802 value into required units (P200). If PV value is the
liquid level, set P124 to the level measurement represented by the 20mA
output from transmitter.

P127 Channel 2 Low Cut-off
Use for forcing D800 to zero while D851 is less than P127

P20x Displayed Measurement Units
P200 for PV (D800), P201 for SV (D801) and P202 for TV (D802)

P210 Optional damping of MCU PV where
D800 = [D800before + ((D800now - D800before)/(1+10 * P210))], at 10 Hz.

For an explanation of P125 and P126, see P115 and P116 in “Profile
Calculations for Contents and Flow Applications“ on page 4-24.

D800 is the PV (Process Variable) value of the 3490 Series Control Unit

D801, D802, D840 and D842 are intermediate results. (They are useful for
trouble-shooting - see “Service and Health Checks“ on page 5-1.)

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Rosemount 3490 Series

Setting up Input Channel 1 for a HART input

This section is applicable if a HART transmitter is connected.

NOTE:

The "Duty" Wizard is recommended for configuring an application.
Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

The HART transmitter digitally communicates pre-calculated values of the
four variables (PV, SV, TV and FV) to the 3490 Series Control Unit. The
values are received continuously by the 3490 Series Control Unit and stored
in parameters D900 to D903. Parameter P111 nominates one of these four
variables to be the source for the PV value of Input Channel 1.

Figure 4-17 on page 4-21 is an overview of the data flow through the channel.

P112 is a +ve or -ve % input offset for optimal adjustment of the normalised
percentage i.e. D802 = D842 + P112. As an example, this feature may be
used to accommodate a standing value of level in a tank. The output is
readable on D802 and is the Tertiary Value (TV) of the 3490 Series Control
Unit.

Table 4-5. P117 Options

Where pre-calculated content or flow values are coming from the transmitter,
P113 need only be set to "scaled". In such a case, parameter P114 is used
only to adjust the value into units that match the display units you may have
changed (P200).

Where pre-calculated level values are coming in from the HART transmitter,
P113 can be set to "scaled" if wanting just level measurement; use P114 as
above. Otherwise, P113 can be set to a profile for generating content or flow
values. For the programming details involving various supported profiles, refer
to Section “Profile Calculations for Contents and Flow Applications“ on
page 4-24.

P117 is a low cut-off parameter that allows the user to force the channel 1
output (D851) to be zero when the calculated value falls below a user defined
value:

P117 Channel 1 Output Action

+ve value Drop immediately to zero.
None Continue measuring.

0.0 Hold output at zero.

-ve value Rise immediately to zero.

This feature is particularly useful in an Open Channel Flow application (OCF)
where a small standing or remaining liquid level in the channel would cause
continued totalising of flow when no actual flow exists. For example, set P117
to a +ve (positive) value of flow units, usually around 2% of maximum flow, to
overcome this problem.

P210 allows the user to apply damping to the calculated value of D851.

The final output of Channel 1 is readable on D800 and is the PV of the 3490
Series Control Unit, which is shown on the display.

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Rosemount 3490 Series

Figure 4-17. HART Txr Input
Blocks and Parameters (Ch. 1)

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P111 = “Tx1 : PV”

Txr

HART

Variables

D900
D901
D902
D903

P111

Input

Source

Select

PV, SV,

TV or FV

SV, TV and FV

P115 P116

P112

Apply

Input

Offset

P114

Apply
Input
Scale

P113

Profile
Select

Profiles

Scaled

Non-Linear

Profile

Post

Scale

NLP

P117

Low

Cut-off

Check

(CH1 O/P)

D851

SV

FV

P210

PV

Damping

(SV)

(TV)

(FV)

D801

D802

D803

Output

Map

TV

Notes:

Parameters from the HART transmitter are available via the Control Unit from
P000 to P099 and D900 to D999. They are accessible from the DIRECT
menu and the MONITOR menu, selectable from the main menu.

D900 'Primary Variable' value from HART transmitter.
D901 'Secondary Variable' value from HART transmitter.
D902 'Tertiary Variable' value from HART transmitter.
D903 'Fourth Variable' value from HART transmitter.

P111 Channel 1 input source - select which HART variable is 'input source'.

P112 Channel 1 input offset - use for optional adjustment to the value from the
nominated 'input source'.

(PV)

D800

P113 Channel 1 profile selection. Keep the "Scaled" option unless requiring a
profile calculation (see “Profile Calculations for Contents and Flow
Applications“ on page 4-24.)

P114 Channel 1 scaling factor - for scaling the 'input source' value into
required units (P200). If PV value is the volume of liquid in a linear vessel, see
“Profile Calculations for Contents and Flow Applications“ on page 4-24 for use
of parameter P114.

P117 Channel 1 low cut-off - use for forcing D800 to zero whenever D851 is
less than P117

P20x Displayed units - P200 for PV (D800), P201 for SV (D801),
P202 for TV (D802), and P203 for FV (D803).

P210 Optional damping of MCU PV where:
D800 = [D800before + ((D800now - D800before)/(1+10 * P210))]
This is calculated 10 times a second before the MCU PV value is finalized.

For an explanation of P115 and P116, see “Profile Calculations for Contents
and Flow Applications“ on page 4-24.

D800 is the PV (Process Variable) value of the 3490
D801 value is the same value as D901
D802 value is the same value as D902
D803 value is the same value as D903

4-20

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Setting up Channel 2 for a HART input (Model 3492 only)

This section is applicable only if a second HART transmitter is connected to
model 3492.

NOTE:

The "Duty" Wizard is recommended for configuring an application.
Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

The HART transmitter digitally communicates pre-calculated values of the
four variables (PV, SV, TV and FC) to the 3490 Series Control Unit. The
values are received continuously by the 3490 Series Control Unit and stored
in parameters D900 to D903. Parameter P121 nominates one of these four
variables to be the source for the PV value of Input Channel 2.

Figure 4-18 on page 4-23 illustrates an overview of the data flow through
Input Channel 2.

P122 is a +ve or -ve % input offset for optimal adjustment of the normalised
percentage i.e. D802 = D842 + P122. As an example, this feature may be
used to accommodate a standing value of level in a tank. The output is
readable on D802 and is the Tertiary value of the 3490 Series Control Unit.

Table 4-6. P127 Options

Where pre-calculated content or flow values are coming from the transmitter,
P123 need only be set to "scaled". Parameter P124 can be used only to
adjust the value into alternative units that match the display units you may
have changed (P200).

Where level values are coming in from the HART transmitter, P123 can be set
to "scaled" if wanting just level measurement, otherwise P123 can be set to a
profile for generating content or flow values. For the programming details
involving various supported profiles, refer to Section “Profile Calculations for
Contents and Flow Applications“ on page 4-24.

Parameter P150 determines how corresponding values from Channels 1 and
2 are processed - sum, difference or product calculation - before being output
to parameters D800 - D803 ('Answers'). P150 can also allow values from
Channel 1 to go straight to D800 - D803; the factory default is for Input
Channel 1 ("Ch1") to do this.

P127 is a low cut-off parameter that allows the user to force the channel 2
output (D852) to be zero when the calculated value falls below a user defined
value:

P127 Channel 2 Output Action

+ve value Drop immediately to zero.
None Continue measuring.

0.0 Hold output at zero.

-ve value Rise immediately to zero.

This feature is particularly useful in an Open Channel Flow application (OCF)
where a small standing or remaining liquid level in the channel would cause
continued totalising of flow when no actual flow exists. For example, set P127
to a +ve (positive) value of flow units, usually around 2% of maximum flow, to
overcome this problem.

P210 allows the user to apply damping to the calculated value of D852.

4-21

Rosemount 3490 Series

The final output of Input Channel 1 is readable on D800 and is the PV of the
3490 Series Control Unit, which is shown on the (factory default) display.

Figure 4-18. HART Input Blocks
and Parameters (Channel 2)

P121 = “Tx2 : PV”

Txr (Tx2)

HART

Variables

D900
D901
D902
D903

P121

Input

Source

Select

PV, SV,

TV or FV

P122

Apply

Input

Offset

P124

Apply
Input
Scale

P123

Profile
Select

P125 P126

Non-Linear

Profile

Profiles

Scaled

Tx1

Tx2

Post

Scale

NLP

PV, SV,

TV and FV

PV, SV,

TV and FV

P127

Low
Cut-off
Check

P151

FV

Select

Reference Manual

00809-0100-4841, Rev. AA

May 2007

(CH2 O/P)

D852

P150

D851

(CH1 O/P)

(SV)

(TV)

(FV)

P210

PV

Damping

D801

D802

D803

(PV)

D800

Notes:

Parameters from the HART transmitter are available on the 3490 Control Unit
from P000 to P099 and D900 to D999. They are accessible from the DIRECT
menu and the MONITOR menu, selectable from the main menu.

D900 'Primary Variable' value from HART transmitter
D901 Secondary Variable' value from HART transmitter
D902 Tertiary Variable' value from HART transmitter
D903 'Fourth Variable' value from HART transmitter

P121 Channel 2 input source - select which HART variable is 'input source'.

P122 Channel 2 input offset - use for optional adjustment to the value from
the nominated 'input source'.

P123 Channel 2 profile selection. Keep the "Scaled" option unless requiring a
profile calculation (see Section “Profile Calculations for Contents and Flow
Applications“ on page 4-24.)

P124 Channel 2 scaling factor - for scaling the 'input source' value into
required units (P200). If PV value is the volume of liquid in a linear vessel, see
“Profile Calculations for Contents and Flow Applications“ on page 4-24 for use
of parameter P114 (CH1) / P124 (CH2)

P127 Channel 2 low cut-off - use for forcing D800 to zero while D852 < P127

P20x Displayed units - P200 for PV (D800), P201 for SV (D801), P202 for TV
(D802) and P203 for FV (D803).

4-22

P210 Optional damping of PV where:

D800 = [D800before + ((D800now - D800before)/(1+10 * P210))], @ 10 Hz

For description of P125 and P126, see P115 and P116 in the section “Profile
Calculations for Contents and Flow Applications“ on page 4-24.

D800 is the PV (Process Variable) value of the 3490 Series Control Unit
D801 value is the same value as D851
D802 value is the same value as D852
D803 value is the same value as the transmitter variable selected by P151

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Profile Calculations for
Contents and Flow
Applications

The 3490 Series Control Unit can use level measurements to calculate the
content in linear or non-linear shaped closed-vessels. In addition, flow in
open-channels can be calculated and totalled. The 3490 Series Control Unit
has a library of pre-programmed profiles and supports a user-defined profile.

The data flow diagrams in “Transmitter inputs to the 3490“ on page 4-13 show
how the various parameters are used to calculate the final 3490’s PV.

NOTE:

You are strongly recommended to use the "Duty" Wizard for setting up
content and flow applications, as this will automatically calculate and populate
the relevant parameters. The Wizard will guide you through all the setting up
and populate parameters with values and settings.
Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

Linear Profile (Content from Level)

Parameter P113 must be set to "Scaled", which establishes that the
relationship between the liquid level and the content (PV value) derived from
that level is linear.

For the linear profile, e.g. vertical cylinder or rectangular vessel, parameter
P114 either defines the maximum content (if 4-20mA transmitter used) or area
of the vessel's cross-section (if HART transmitter used). The PV value (D800)
for the content is then calculated as the live level measurement multiplied by
the value in parameter P114.

Standard 4-20mA input (Figure 4-15 on page 4-15):

• P200 (units) must have changed from "%" to the required units of
measurement.

• P114 is used to define maximum contents of the linear profile vessel.

• The PV value (D800) is calculated using: D800 = P114 x (D802 / 100)

• Note that P115 and P116 are bypassed in this scenario.

HART digital input (Figure 4-17 on page 4-21):

• P200 (PV units) must be set to the required units of measurement.

• P114 is used to define the contents of the linear vessel per unit of level
measurement. If the input from the HART transmitter is in metres, the
value of P114 is the contents of the vessel per metre of height. If the input
from the HART transmitter is in feet, the value of P114 is the contents of
the vessel per foot of height.

• The PV value (D800) is calculated using: D800 = ( P114 x Level
measurement).

• Note that P115 and P116 are bypassed in this scenario.

Non-linear Profiles (Content from Level)

• Non-linear profiles for content:

• Horizontal cylinder with flat ends.

• Spherical vessel.

• Horizontal cylinder with domed ends.

• Special (plotted).

4-23

Rosemount 3490 Series

The 3490 Series Control Unit has a library of non-linear profiles. After a profile
is selected through parameter P113, the 3490 automatically recalls the profile
from memory and populates P115. The standard non-linear profiles require an
input signal over the range 0 - 1.0. Parameter P114 is therefore used to scale
the input signal over the range 0 - 1.0, as described below:

Standard 4-20mA input (Figure 4-15 on page 4-15):

• P200 (PV units) must have changed from "%" to the required units of
measurement.

• The transmitter's 4-20mA output should be scaled to give a 4-20mA signal
over the full height of the vessel, in which case P114 may be left at the
default value of 1.0.

• If the transmitter's 4-20mA output is not scaled to give a 4-20mA signal
over the full height of the vessel, P114 must be used to re-scale the signal
ready for input to the NLP calculation.

• For example, if the maximum current input is below 20mA for a full vessel,
say 18mA, re-scale using P114, calculating: P114 = (Current span Actual
current span) = 16 (18-4) = 1.143

• Refer now to “Non-linear Profile (NLP) calculation”.

Reference Manual

00809-0100-4841, Rev. AA

May 2007

HART digital input (Figure 4-17 on page 4-21):

• P200 (PV units) must be set to the required units of measurement.

• The maximum value of level from the HART transmitter must be equal to
the height of the liquid when the vessel is full.

• The level measurement, after any input offset has been applied, must be
re-scaled to the range 0 - 1.0 ready for input to the NLP calculation.

For example, if the level range is 0 - 4.0, then P114 = (1.0 / 4.0) = 0.25.

• Refer now to Section “Non-linear Profile (NLP) calculation”.

Non-linear Profile (NLP) calculation

With P113 set to the NLP required and P114 correctly calculated, P115 will
have been automatically programmed with the correct NLP. P116 is always
programmed with the maximum contents of the vessel in the units chosen
(P200).

Some examples of popular NLP applications are shown below:

4-24

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Figure 4-19. examples of
popular NLP applications

P113 = “Spherical”

Rosemount 3490 Series

P113 = “Horiz Cyl Flat”
(Horizontal Cylinder, Flat Ends, Slope Ignored)

P114 = (1.0 / Diameter of tank)
P115 = Plotted profile of tank *
P116 = Full volume of ideal spherical tank

P113 = “Conical” ‡

P114 = (1.0 / Maximum level)
P115 = Plotted profile of tank *
P116 = Full volume

* The non-linear profile (NLP) is plotted automatically when editing P113, or when using “Duty” Wizard.

Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

‡ P115 is plotted with a simple cone if P113 is edited manually.

Using the 20-point manual plot feature in a contents application

P114 = (1.0 / Diameter of tank)
P115 = Plotted profile of tank *
P116 = Full volume of ideal cylindrical tank

P113 = “Horiz Cyl Flat”
(Horizontal Cylinder, Domed, Slope Ignored)

P114 = (1.0 / Diameter of tank)
P115 = Plotted profile of tank *
P116 = Full volume

When parameter P113 is set to be "special", P115 (CH1 NLP Data) is used for
defining a 20-point look-up table that represents the non-linear profile of a
tank/vessel that is not in the 3490’s library.

Each point is a Cartesian co-ordinate (X, Y). The X points are at user-defined
intervals, typically in equal increments (5%) of maximum height. The X value
represents a level. The Y value is the corresponding volume.

Alternatively, these values may be entered in actual level (e.g. in metres) and
volume (e.g. m3) in which P114 and P116 are both 1.000. The volume is
derived from the plotted profile using interpolation between the plot points.

4-25

Rosemount 3490 Series

The X and Y values may be 'normalised' (range 0 to 1). In this case, the
volume is derived from automatic linearisation of the profile using the live level
measurements that are pre-'normalised' (0 to 1) by P114. A Post Scale NLP
(P116) must then be applied to the result of linearisation to obtain the volume
for the PV.

Figure 4-20. P115 = 3490
Plotted Profile for "Spherical"

P115 = Plotted Profile for “Spherical” option

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Y

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Normalised units (range 0 to 1) Actual level (X) and Volume (Y) units

Y

2000.0

1800.0

1600.0

1400.0

1200.0

1000.0

800.0

600.0

400.0

200.0

X

0.0

0.40.81.21.62.02.42.83.23.64.0

X

How to edit the 'look-up' table (P115):

(Note: Parameter P113 must be set to be "Special".)

1. Navigate to the P115 parameter screen (see Figure 4-21 on page 4-28).

2. Press the red (ENTER) button once to select point 0. (Before editing, you

can use the DOWN-ARROW button to page down to another point or use
the ESC button to return to the menu.)

3. With the "X0:" text highlighted, use the RIGHT-ARROW button to move

across to the X0 value.

4. Use the arrow buttons to edit the X0 value.

5. Press the red (ENTER) button once to confirm the new X0 value.

6. With the "Y0:" text highlighted, use the RIGHT-ARROW button once to

move across to the Y0 value.

7. Use the arrow keys to edit the Y0 value.

8. Press the red (ENTER) button once to confirm the new Y0 value.

9. To re-edit X0 and Y0, press the red (ENTER) button and repeat as before.

Otherwise, use the DOWN-ARROW button to display the page with X1
and Y1. (The parameter number P115 does not change until beyond X20,
Y20.)

10. Repeat for all points in the profile. To return to the menu at any time, use

the ESC button.

4-26

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Table 4-7. Default 20-point
Look-up Table Values (P115)

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

X 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Y 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Notes:

• It is not necessary to define all points. However, an X value of 0.0
terminates the profile (unless it is point X0, Y0).

• Whilst editing, the ESC button can be used to abort editing and restore
the original value; it needs to be pressed again to move back to the 'X' or
'Y' text.

Figure 4-21. Figure 17
Navigation to P115 parameter
screen

Rosemount 3490 Series

Non-linear Profiles (Flow from Level)

Standard non-linear profiles for flow:

•Flume 3/2

• V-Notch 5/2

• Manning formula

• Special (plotted)

NOTE:

The "Duty" Wizard is the easiest way to set-up a flow application.
Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

The 3490 Series Control Unit has a library of profiles for open-channel flow
measurement, two of which are illustrated in Section “Non-linear Profile (NLP)
calculation“ on page 4-29.

When selecting "V Notch", "Flume/Weir" or "Manning" through parameter
P113, the 3490 Series Control Unit automatically populates parameter P115
with a look-up table for the non-linear profile.

The standard flow profiles require an input signal in the range 0 - 1.0.
Parameter P114 is therefore used to scale the input signal over the range
0 - 1.0 as described below.

4-27

Rosemount 3490 Series

Standard 4-20mA input (Figure 4-15 on page 4-15):

P200 (PV units) must have been changed from "%" to the required units of
measurement.

The transmitter's 4-20mA output should be scaled to give a 4-20mA signal
over the full level range expected in the flow channel. If this is the case,
parameter P114 may be left at the default value of 1.0.

If the transmitter's 4-20mA output is not scaled over the full level range of the
liquid in the channel, P114 must be used to re-scale the signal ready for input
to the NLP calculation.

For example, if the maximum current input is below 20mA for the maximum
height of liquid in the channel, say 12mA, re-scale via P114:

P114 = (Current span Actual current span) = 16 (12-4) = 2.0

Refer now to the Section Non-linear Profile (NLP) calculation.

HART digital input (Figure 4-17 on page 4-21):

P200 (PV units) must be set to the required units of measurement.

Reference Manual

00809-0100-4841, Rev. AA

May 2007

The maximum value of level from the HART transmitter must be equal to the
maximum height of the liquid in the channel.

The level measurement must be re-scaled to the range 0 - 1.0 ready for input
to the NLP calculation. For example, if the level measurement range is
0 - 1.5m, parameter P114 = (1.0 1.5) = 0.667

Refer now to the Section Non-linear Profile (NLP) calculation.

Non-linear Profile (NLP) calculation

With P113 set to the NLP required and P114 correctly calculated, P115 will
have been automatically programmed with the correct NLP.

P116 is always programmed with the maximum flow expected in the channel,
which will occur at the maximum liquid level in the channel.

The PV value (D800) for the flow rate is derived by applying the normalised
transmitter input (range 0 to 1) to the profile, and then scaling by parameters
P114 and P116.

Figure 4-22 shows a typical open channel flow structure.

4-28

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Figure 4-22. Non-linear profiles

Rosemount 3490 Series

P113 = “Flume (3/2)” (using 3/2 power law) (To BS3680)

P114 = (1.0 / Maximum height of liquid)
P115 = Plotted profile of channel *
P116 = Maximum flow at maximum height (P114)

* The non-linear profile (NLP) is plotted automatically when editing P113, or when using “Duty” wizard.

Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard

Pre-programmed flat, parabolic, and Parshall flumes

The 3490 Series Control Unit has a library of flat, parabolic, and Parshall
flumes that will automatically populate parameters with pre-defined values.
Alternatively, you can manually enter parameter values.

When selecting one of the flumes through P113, the Control Unit uses P115 in
a different way to when a plotted NLP is required. For flumes, P115 is used to
store pre-defined values for the flow calculation where flow Q is given by:

Q = k x (h x mul)

Pwr

where h is the height of liquid in the channel, and k and Pwr are factors.

This modified version of the more standard "Q=k x h

Pwr

" flow formula allows
the use of a multiplier (mul) factor. This extra factor can account for
irregularities or errors in the flow structure, but should only be manually
entered where such errors can be quantified.

Pre-defined values for factors k, mul and Pwr of each standard flow structure
in the library are shown in Table 4-8 and Table 4-9. Depending on the
derivation of k and the level units, the h value is scaled by a different mul
factor.

Experienced users may wish to manually enter the values of k, mul or Pwr for
specific applications. To edit these, set P113 to be "Flume***" and then edit
parameter P115. Use the DOWN-ARROW button to display the mul value.

The display units (P200) are also automatically changed to flow units of either
g/m (imperial for Parshall) or m

3

/hr (metric for other flumes). P116 is also

automatically populated to get the correctly scaled PV for these display units.

4-29

Rosemount 3490 Series

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Table 4-8. Pre-programmed
flow calculation factors (flumes)

Profile (P113)

Flume Flat 1 0.1347877 1.5 0.01 3600.0
Flume Flat 2 0.1782664 1.5 0.01 3600.0
Flume Flat 3 0.3134177 1.5 0.01 3600.0
Flume Flat 4 0.5417157 1.5 0.01 3600.0
Flume Flat 5 0.8111058 1.5 0.01 3600.0
Flume Flat I 0.1322 1.5 0.01 3600.0
Flume Flat II 0.1777 1.5 0.01 3600.0
Flume Flat III 0.21758 1.5 0.01 3600.0
Flume Flat III bis
Flume Flat III ter 0.272 1.5 0.01 3600.0
Flume Flat IV 0.3521726 1.5 0.01 3600.0
Flume Flat V 0.442932 1.5 0.01 3600.0
Flume Flat V bis 0.4005 1.5 0.01 3600.0
Flume Flat VI 0.4990569 1.5 0.01 3600.0
Flume Flat VII 0.6237 1.5 0.01 3600.0
Flume Flat VIII 0.88116 1.5 0.01 3600.0
Flume Flt VIII bis 0.798 1.5 0.01 3600.0
Flume Flat IX 1.065186 1.5 0.01 3600.0
Flume Flat IX bis 0.8148 1.5 0.01 3600.0
Flume Flat X 1.3222761 1.5 0.01 3600.0
Flume Flat X bis 1.609 1.5 0.01 3600.0
Flume Flat X ter 1.064884 1.5 0.01 3600.0
Flume Flat XI 1.65099 1.5 0.01 3600.0
Flume Para 1 0.39885 2.3 0.01 3600.0
Flume Para 2 0.44187 2.3 0.01 3600.0
Flume Para 3 0.46362 2.2 0.01 3600.0
Flume Para 4 0.54419 2.2 0.01 3600.0
Flume Para 5 0.61851 2.1 0.01 3600.0
Flume Para 6 0.71726 2.1 0.01 3600.0
Flume Para 7 0.77152 2.1 0.01 3600.0
Flume*** (User) (User) (User) 3600.0

(1) After selecting a flat or parabolic flume using P113, parameter P115 (Pwr, k, and mul factors) and

parameter P116 are populated for measuring flow in metric units of cubic metres per hour (m
For flow measurement in alternative units (with automatic scaling of MCU PV), use the Duty Wizard.
(Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard)
The choice of units offered depends on whether the transmitter is measuring in metric or imperial units.

(1)

k (P115) Pwr (P115) Mul (P115) P116

0.32835

1.5 0.01 3600.0

3

/hour).

4-30

NOTE:

When a flume is selected from this list, the 3490 Series Control Unit also
populates parameters P401 and P401 (4-20mA output), P530 (Totaliser
factor), and P531 (Totaliser units of m3 or galx100).

Standard flow calculations of form Q=k x h

When P113=“Flume***”, the flow calculation is of the standard flow law form
of Q=k x h

Pwr

. This option is applicable when the flow structure does not

Pwr

match one of the pre-programmed standard structures.

Enter your pwr, k and mul factors into parameter P115. Then, use P200 to
select the display units. Finally, use P116 to get the correctly scaled MCU PV
for the chosen display units.

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Table 4-9. Pre-programmed
flow calculation factors (Parshall
flumes)

Profile P113

Parshall 1 in 1.550 151.7 1.0 1.0
Parshall 2 in 1.550 303.4 1.0 1.0
Parshall 3 in 1.547 445.2 1.0 1.0
Parshall 6 in 1.580 924.5 1.0 1.0
Parshall 9 in 1.530 1378 1.0 1.0
Parshall 1 ft 1.522 1795 1.0 1.0
Parshall 1.5 ft 1.538 2693 1.0 1.0
Parshall 2 ft 1.550 3590 1.0 1.0
Parshall 3 ft 1.566 5386 1.0 1.0
Parshall 4 ft 1.578 7181 1.0 1.0
Parshall 5 ft 1.587 8976 1.0 1.0
Parshall 6 ft 1.595 10770 1.0 1.0
Parshall 8 ft 1.607 14360 1.0 1.0
Parshall 10 ft 1.600 17672 1.0 1.0
Parshall 12 ft 1.600 20982 1.0 1.0

(1) After selecting a Parshall flume using P113, parameter P115 (Pwr, k, and mul factors) and parameter

P116 are populated for measuring flow in imperial units of US gallons per minute (GPM).
For flow measurement in alternative units (with automatic scaling of MCU PV), use the Duty Wizard.
(Menu: SETUP / [CONTROL UNIT /] DUTY(Mode) / Duty Wizard)
The choice of units offered depends on whether the transmitter is measuring in metric or imperial units.

(1)

Pwr (P115) k (P115) mul (P115) P116

Kindsvater Shen (V-notch)

P113 = “Kindsvater Shen”

The Kindsvater Shen calculation requires just the angle of the V-notch to
calculate a flow value over the weir. The head level is in units of metres and
the resultant flow value is in cubic metres per second (m

3

/s).

Exponential flow law

P113 = “Flow calculation”

Exponential laws are supported by selecting this profile option, and manually
entering values of k-factor, power, and mul.

The output is derived from the input value using:

Q = k x (mul x Input)

pwr

Using the 20-point manual (DIY) plot feature in a flow application

When parameter P113 is set to "Special", parameter P115 is used for defining
a 20-point look-up table that represents the flow profile of the channel. The
flow profile is established by entering the flow/liquid height relationship as a
series of Cartesian co-ordinates.

As an example, a 3/2 flume is shown in Figure 4-23.

The X points are at user-defined intervals, typically in equal (5%) increments
of height. However, this may be changed if it is required to concentrate points
at a particular level in the channel of flow structure. The Y points are the
corresponding flow rates.

Enter data in normalised form or in actual level/flow units.

For further details of programming the points, refer to page 4-26.

4-31

Rosemount 3490 Series

Figure 4-23. P115 = 3490
Plotted Profile for "Flume (3/2)"

P115 = Plotted Profile for “Flume (3/2)”

Y

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

0.1 0. 2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Normalised units (range 0 to 1)

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May 2007

X

4-32

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May 2007

Rosemount 3490 Series

Digital Inputs IN1 and IN2 Digital inputs IN1 and IN2 can be individually set-up to perform an action

whenever they are activated.

NOTE:

Digital input status icons are shown on the left-hand side of the Primary
Display: o = inactive or = active.
In addition, parameter D835 shows the status of the inputs: active (1) or
inactive (0). First digit represents IN1.

How to allocate an action to IN1 or IN2:

1. Navigate to:

MAIN MENU / SETUP / [CONTROL UNIT /] DIGITAL INPUT

2. Select a 'Digital Input' menu: Action, Delay or On-State.

3. Allocate a function by editing the Action Select parameter P340 (for IN1)

or P345 (for IN2).

Table 4-10 lists all the options and explains their purpose

4. If you require a delay before an action is performed, edit the Delay

parameter P341 (for IN1) or P346 (for IN2).

Table 4-10. Digital Input Actions

The parameter value format is m:s (minutes and seconds).

5. To change the logic of the input for triggering an action, edit the On State

parameter P342 (IN1) or P347 (IN2).

Options are "Closed" (active when voltage-free contact is closed: default
setting) and "Open" (active when open).

Action Action that occurs while digital input is active

Free Digital Input has no allocated action. (Default).
Alarm Forces an alarm condition, which is indicated if specified in the ALARM

menu. For information about alarms and features they affect, see Section

“About Alarms“ on page 4-60.
Go Offline Changes the operating mode to off-line (open padlock).
Hold totaliser Freezes the internal totaliser.
Hold MCU PV Prevents the PV value (D800) from being updated while the digital input is

Suppress Alarm The Alarm relay is held on. If the digital input is active when an alarm

Display Msg Displays a user-defined message (P241).
Log Input When the next logging interval elapses, flag the data logged as a 'bad

Pump-down

Lock Params Prevent 'P' prefixed parameters from being edited.
Protect totaliser 1 Protect totaliser 1 from being reset.
Reset totaliser 2 Reset totaliser 2. (Models 3492 and 3493 only).

(1) SETUP / [MCU CONTROL UNIT /] Duty(Mode)/ Message.
(2) Pump-down feature available on models 3491 and 3492 only.

active.

condition is present, a message is displayed indicating the alarm is being

overridden.

sample' if the digital input has been active. (Model 3493 only)

(2)

Invoke a pump-down operation

(see Section “Pump-down (Models 3491 and 3492 only)“ on page 4-54).

(1)

4-33

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Rosemount 3490 Series

Logging (3493 Only) Menu: MAIN MENU / SETUP / [CONTROL UNIT /] LOGGING

Overview

Model 3493 will log up to 7000 events at regular intervals. An event is the
value of a parameter. The parameter to be logged is the one selected for the
middle section of the Primary Display (see “Primary Display Options“ on
page 4-72). This parameter is typically the MCU Primary Variable (MCU PV).

If model 3493 has been set-up to totalise the parameter value, the daily value
of the totaliser at midnight is also logged. Up to 60 midnight totalised values
will be held in memory. (This is in addition to the memory for 7000 events.)

In addition, the maximum instantaneous value of the parameter recorded in
each 24-hour period is logged.

Logged data may be downloaded at any time using the RS232 data port
socket provided for connection details (see “RS232 Connections“ on
page 3-13). You can download data using a PC with optional logger software.

NOTE:

See “Serial Communications“ on page 4-74 for associated parameters.

May 2007

Model 3493 gives a visual indication that logging of data is underway by
flashing "LOG" in the bottom, right-hand corner of the Primary Display.

P590: Logging Interval

The logging interval is the period over which the parameter-to-be-logged
(e.g. MCU PV) is sampled every 5 seconds and then averaged at the end.
The averaged value is then logged.

An interval value of 15 minutes will log the averaged value at 15-minute
intervals, which equates to 50 days elapsed time.

P591: Fast Log Mode

If the (logged) parameter value exceeds a user-entered value (P591), model
3493 automatically moves to a fast log mode and then logs the PV once every
minute until the (logged) parameter value falls below that user-entered value.
Fast log values are tagged, and so are easily identified when examining
logged data.

P593: Low Memory Alarm

The user may allocate an alarm to indicate when the memory remaining falls
to a user-defined percentage (P593). The user must also set the action to be
taken when this occurs. A choice of activating a relay, driving the output
current to a set level, or doing both is available (P542).

If no action is taken, the memory will fill, and then logged data will either be
overwritten or the logging will stop, as determined by parameter P592.

4-34

Parameter D846 shows the percentage of free memory remaining for data
logging.

P592: Do/Do not Overwrite Old Data

Once the logging memory is full, there is a choice to continue logging, in
which case the earliest data is overwritten, or logging may be stopped at that
time.

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Figure 4-24. Navigating to the
LOGGING Menu

Rosemount 3490 Series

Starting, stopping and resetting the logger

To start logging, simply change the logging interval (P590) from 0 to the
interval required. Logging is now activated.

To stop logging, simply change the logging interval (P590) back to 0. Note,
when the logging interval is re-set, all logged data will be cleared from the
logging memory.

Changing the logging interval from 0 to a logging interval in minutes will clear
all data logged (i.e. clear the 7000 event-memory plus the 60 midnight totals).

Changing the log interval from a non-zero interval (e.g. 15 minutes) to a new
non-zero interval (e.g. 5 minutes) will clear the 7000 event-memory).

Figure 4-25. Menu Map for
LOGGING screens

The SELECT INSTRUMENT menu does not appear unless a HART transmitter is connected

4-35

Rosemount 3490 Series

Logging Wizard - Logging of level measurements

The Logging Wizard is the easiest way to configure a data logging application
after the main duty (e.g. level) is set-up.

Consider data logging of the MCU PV value (D800) every 5 minutes, whereby
the PV value is a level measurement in metres. When the level measurement
is at one metre or more, the Fast Log Mode is required to activate. When the
memory is full, old data is overwritten.

1. Navigate the menu system to get to the "Logging Wizard" screen, as
guided in Figure 4-24 on page 4-36.

2. Start the "Logging " Wizard by pressing the red (ENTER) button once.

3. Work through the "Duty" Wizard prompts (Figure 4-26) until completion;
this occurs when the menu system re-appears. Keypad hints, for the
illustrated Wizard sequence on the next page, are provided alongside the
prompts. If applicable, adapt the example to suit your application.

4. Circled numbers in the illustrated Wizard sequence relate to these notes:

(1) Press the red (ENTER) button once.

(2) Set the logging interval to once every 5 minutes (see P590).

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Figure 4-26. Logging Wizard ­Logging of level measurements

(3) Set Fast Log Mode to activate at one metre or more (see P591). Units

are dependent on PV units (P200).

(4) Select the "None" option if no digital inputs are to be configured.

5. Return to the main menu by holding the ESC button for a few seconds,
releasing it when the main menu appears. Next, go on-line by selecting
the "Go on-line" menu option and then pressing the red (ENTER) button
once. Finally, press the ESC button repeatedly until the primary display
appears. You will now see "LOG" flashing on the primary display to
indicate logging is underway.

4-36

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May 2007

Rosemount 3490 Series

Logging Wizard - Logging of flow measurements

The Logging Wizard is the easiest way to configure a data logging application
after the main duty (e.g. flow) is set-up.

Consider data logging of the MCU PV value (D800) every 15 minutes, where
the PV value is a flow measurement in cubic metres per second. When the
flow measurement is at 1 cubic metre per second or more, the Fast Log Mode
is required to activate. When the memory is at 90% of capacity, a relay is
activated instead of overwriting old data.

1. Navigate the menu system to get to the "Logging Wizard" screen, as
guided in Figure 4-24 on page 4-36.

2. Start the "Logging " Wizard by pressing the red (ENTER) button once.

3. Work through the "Duty" Wizard prompts (Figure 4-27) until completion;
this occurs when the menu system re-appears. Keypad hints, for the
illustrated Wizard sequence on the next page, are provided alongside the
prompts. If applicable, adapt the example to suit your application.

4. Circled numbers in the illustrated Wizard sequence relate to these notes:

(1) Press the red (ENTER) button once

Figure 4-27. Logging Wizard ­Logging of flow measurements

(2) Set the logging interval to once every 15 minutes (see P590)

(3) Set Fast Log Mode to activate at 1 m

dependent on PV units (P200).

(4) Relay 4 is to activate when there is a low memory condition (see

Section “P593: Low Memory Alarm“ on page 4-35)

(5) Low memory condition when memory is at 90% of capacity.

5. Return to the main menu by holding the ESC button for a few seconds,
releasing it when the main menu appears. Next, go on-line by selecting
the "Go on-line" menu option and then pressing the red (ENTER) button
once. Finally, press the ESC button repeatedly until the primary display
appears. You will now see "LOG" flashing to indicate logging is underway.

3

/s or more (see P591). Units are

4-37

Rosemount 3490 Series

Current Output NOTE:

The current output of the 3490 Series Control Unit is FROZEN when the unit
is in the "off-line" mode.

The Current Output Channel

The Current Output channel is for transmitting the MCU PV value (D800) as a
4-20mA signal.

For example, consider a PV value of 5 metres and the PV range is 0 to 10
metres. This would mean 0 metres is represented by a 4mA signal (0%), 10
metres is represented by 20mA signal (100%) and 5 metres is represented by
a 12mA signal (50%). Therefore, the Current Output channel would output the
PV value as a 4-12mA signal.

Programming involves specifying the PV range with low range (minimum) and
upper range (maximum) values.

Menu:
MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / CURRENT OUTPUT

P400 Low Range Val (Factory default is 0.0)

Reference Manual

00809-0100-4841, Rev. AA

May 2007

This is the PV value represented by 4mA.

P401 Up Range Val (Factory default is 100.0)

This is the PV value represented by 20mA.

P402 Alarm Actions (Factory default is 3.6mA)

Optional parameter for determining how an alarm, if selected in the ALARM
menu, is indicated on the Current Output channel. Options for P402 are:

• "3.6mA" - fix current output to 3.6 mA to force a low current limit alarm.

• "3.75mA" - fix current output to 3.75 mA to force a low current limit alarm.

• "Hold"- freeze the current output at the present value.

• "21mA"- fix current output to 21 mA to force high current limit alarm.

• "21.75mA"- fix current output to 21.75 mA to force high current limit alarm.

• "22.5mA"- fix current output to 22.5 mA to force high current limit alarm.

NOTE:

The “3.75mA” and “21.75mA” options are the Rosemount standard.
The “3.6 mA” and “22.5 mA” options are the NAMUR NE43 standard.

Alarms and indications are as explained in “About Alarms“ on page 4-60. See
also Table 4-15 on page 4-62 for summary of reporting methods for Alarms.

NOTE:

There is another alarm condition when the current output has reached the
linear limit i.e. saturated. For the Rosemount Standard, this is

≥ 20.8mA. For the NAMUR NE43 standard, this is ≤ 3.8mA or ≥ 20.5mA.

≤ 3.9mA or

4-38

Reference Manual

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May 2007

P404 mA Mode (Factory default is “Instantaneous”)

On model 3493, this optional parameter is for assigning the Current Output to
follow a rolling average of the calculated MCU PV (typically flow). To do this,
select the Rolling option.

The time period for the rolling averaging is defined using P590, which is also
for defining the logging interval (see “Logging (3493 Only)“ on page 4-35).

P210 MCU PV Damping (Factory default is 0)

The 3490’s current output is proportional to the calculated MCU PV. It is
possible to apply damping to the MCU PV using P210, which will have the
effect of damping the current output.

Relays NOTE:

Relay states are frozen when 3490 Series Control Unit is in "off-line" mode.

Menu Navigation List: (for locating relay parameters)

1. MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / RELAY

2. MAIN MENU / SETUP / [CONTROL UNIT /] DUTY(Mode) / OVERRIDES

3. MAIN MENU / SETUP / [CONTROL UNIT /] DUTY(Mode) / CUSTOM

Rosemount 3490 Series

Overview of Relay Functions

Relay outputs 1 to 4 are normally On Point / Off Point control relays which
may be used to start/stop pumps or open/close valves at different levels. They
normally energise at one level and de-energise at a different level. For further
details, see Section “On/Off Point Control“ on page 4-42.

Alternatively, they can be programmed as out-of-limit alarms; they energise
between defined points and will de-energise outside those points. They may
also be programmed to perform a variety of auto-sequences and auxiliary
functions, such as pump-down operations, pump rotations to equalise wear,
and de-sludge/cleaning. For further details, see Section “Alternative Duties“
on page 4-43.

Relay output 5 is normally a fail safe fault relay but may be re-allocated to
another duty.

NOTE:

Relays are frozen while the 3490 Series Control Unit is off-line, preventing all
relay operations apart from Totaliser and Sampler relays.

Relay Wizard

Relay outputs can be set-up easily using the "Relay" Wizard, accessible by
navigating to the RELAYS menu screen. The Wizard also forms a part of the
"Duty" Wizard.

4-39

Rosemount 3490 Series

Figure 4-28. Navigating to the
RELAY Screen

The SELECT INSTRUMENT menu is skipped automatically if there are no HART transmitters.
(Model 3491 screens shown.)

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May 2007

4-40

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Rosemount 3490 Series

Relay (RL) Status

The relay status icons on the primary display have the following meanings:

= energised: Relay is presently energised.

0 = de-energised: Relay is presently de-energised.

A = Alarm: Relay allocated to alarm duty (see page 4-60 about alarms.)

S = Sampler: Relay is allocated to sampling duty.

T = Totalising: Relay is allocated to totalising duty.

Relay parameter reset

To reset all relay parameters to their factory defaults, do the following:

4. Navigate to:
MAIN MENU / SETUP / [C. UNIT /] OUTPUT / RELAY / Reset RL param

5. If you wish to proceed, press the red (ENTER) button once. (Otherwise,
use the ESC button to exit to the menu).

6. Wait until the "Please wait…" message disappears.

7. Press the ESC button to return to the menu.

NOTE:

Setting the relays to their factory default state in this way does NOT reset any
other parameters to their default state.

On/Off Point Control

Relay outputs 1 to 4 can be set-up to be On Point and Off Point control relays:

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / RELAY

Relay 1 (RL1):

If mode is "Set Point" (P410) - relay energised at P411 (On) and de-energised
at P412 (Off)

Relay 2 (RL2):

If mode is "Set Point" (P420) - relay energised at P421 (On) and de-energised
at P422 (Off)

Relay 3 (RL3):

If mode is "Set Point" (P430) - relay energised at P431 (On) and de-energised
at P432 (Off)

Relay 4 (RL4):

If mode is "Set Point" (P440) - relay energised at P441 (On) and de-energised
at P442 (Off)

In a basic emptying application, the On point (e.g. P411) is programmed to be
greater than the Off point (e.g. P412). Relay 1 in this case will energise when
the PV value (D800) exceeds the On point (P411) and de-energise when the
PV value drops below the Off point (P412).

4-41

Rosemount 3490 Series

In a basic filling applications, the On point (e.g. P411) is programmed to be
less than the Off point (e.g. P412). Relay 1 in this case will energise when the
PV value (D800) drops below the On point (P411) and de-energise when the
PV value rises above the Off point (P412).

When the relay mode is "Set Point" (as above), the PV value is used to control
the relays. There are set point modes for the SV value (D801), TV value
(D802) and FV value (D803). For details of these, see Section “Transmitter
inputs to the 3490“ on page 4-13.

Relay Safeguard Options

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / RELAY

P413 RL1 Min On (Factory default: 0:00 m:s)

Defines the minimum time (minutes and seconds) that relay RL1 will stay
energised before de-energising. This is an optional override (safeguard) to
allow sufficient time for connected equipment to respond.

P414 RL1 Max On Factory default: 0:00 m:s)

Defines the maximum time (minutes and seconds) that relay RL1 will stay
energised before de-energising. This is an optional override (safeguard) to
prevent overuse of connected equipment.

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00809-0100-4841, Rev. AA

May 2007

P415 RL1 Min Off (Factory default: 0:00 m:s)

Defines the minimum time (minutes and seconds) that relay RL1 will stay
de-energised before energising. This is an optional override (safeguard) to
avoid overuse of connected equipment.

P423 to P425 are the equivalents for relay RL2

P433 to P435 are the equivalents for relay RL3

P443 to P445 are the equivalents for relay RL4

P453 to P455 are the equivalents for relay RL5

Alternative Duties

Relays can perform alternative duties beside the "On/Off point control"
operation described in Section “On/Off Point Control“ on page 4-42.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / RELAY

P410 Relay 1 Mode (Factory default is "None")

P420 Relay 2 Mode (Factory default is "None")

P430 Relay 3 Mode (Factory default is "None")

P440 Relay 4 Mode (Factory default is "None")

P450 Relay 5 Mode (Factory default is "Fault")

Table 4-11 on page 4-44 lists all relay modes (duties) and what they do. Relay
modes automatically enable and disable special control functions, special
alarms and pumped volume totalising as shown in Table 4-12 on page 4-45.
Descriptions of the relay modes and the auxiliary functions follow Table 4-12.

4-42

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Table 4-11. Relay Modes

Rosemount 3490 Series

Relay Mode Purpose of Relay Mode

"None" Relay is not used No
"Set point SV" On/Off Point Control using SV (D801).

(See Section “On/Off Point Control“ on page 4-42).

"Set point TV" On/Off Point Control using TV (D802).

(See Section “On/Off Point Control“ on page 4-42).

"Set point FV" On/Off Point Control using FV (D803).

(See Section “On/Off Point Control“ on page 4-42).

"Assist" Duty Assist - On/Off Point Control

(See “On/Off Point Control“ on page 4-42)
and Auto Sequence
(See “Auto-Sequence (Models 3491 and 3492 only)“ on
page 4-53).

"Stby com off" Duty Standby, Common Off

(See “Standby, Common Off Relay“ on page 4-46)
and Auto Sequence
(See “Auto-Sequence (Models 3491 and 3492 only)“ on
page 4-53).

"Stdby split off" Duty Standby, Split Off

(See “Standby, Split Off Relay“ on page 4-49)
and Auto Sequence
(See “Auto-Sequence (Models 3491 and 3492 only)“ on

page 4-53)
"Digital Input 1" Relay energises while Digital Input 1 (IN1) is active. Yes
"Digital Input 2" Relay energises while Digital Input 2 (IN2) is active. Yes
"Sampler" Relay outputs sampler pulses.

(See “Sampler Relay“ on page 4-52
"RoC" Relay is energised if the Rate of Change of the PV is

out-of-limits

(See “Rate of Change Relay“ on page 4-53).
"Digital input 1+2" Relay is energised while Digital Input 1 (IN1) and 2 (IN2)

are both active
"Off" Relay is always de-energised No
"Set Point" On/Off Point Control using PV (D800)

(See Section “On/Off Point Control“ on page 4-42). No

auto sequencing.
"Desludge" To set-up the de-sludge operation, use the section

“Custom“ on page 4-55.
"Alarm" Relay is allocated to alarm indication duty - see Section

“About Alarms“ on page 4-60 for details of alarm handling.
"Totaliser" Relay outputs totaliser pulses. (model 3491 only)

(See Section “Totaliser Relay“ on page 4-52).
"Totaliser 1" Relay outputs totaliser 1 pulses (models 3492/3493 only).

(See Section “Totaliser Relay“ on page 4-52).
"Totaliser 2" Relay outputs totaliser 2 pulses (model 3492/3493 only).

(See “Totaliser Relay“ on page 4-52).
"Fault" Indicate fault condition by de-energising relay

(See “Fault Relay“ on page 4-52).
"Cleaning" To set-up a cleaning operation, use section “Custom“ on

page 4-55.
"PV limits" Relay energises while PV value (D800) is within limits.

(See “PV limits Relay“ on page 4-53).
"On" Relay is always energised No

(Table 4-12)

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

No

No

No

No

No

Yes

Auxiliary

functions

4-43

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May 2007

Rosemount 3490 Series

4-44

Table 4-12. Auxiliary functions
valid for a given relay mode

SPECIAL CONTROL FUNCTIONS SPECIAL ALARMS

RELAY MODE

SET

POINTS

(1)

AUTO

SEQUENCE

ENERGY

SAVING

SCUM LINE

(1)

PUMP

DOWN

(1)

CUSTOM

RELAY

OPS

RELAY RUN

TIME

NO

ACTIVITY

RISING
LEVEL

PUMP
EFFICIENCY

PUMPED
VOLUME

None

Set Point (SV)

Y Y Y Y Y Y Y Y

Set Point (TV) Y YYY YYY Y
Set Point (FV) Y Y Y Y Y Y Y Y

Assist YYYYY YYYY Y Y
Stby Com-off Y Y Y Y Y Y Y Y Y Y Y
Stby Split-offYYYYY YYYY YY
(Digital Inputs) Y Y Y
Sampler
Rate change Y Y Y Y
Off
Set point (PV) Y Y Y Y Y Y Y Y
De-sludge Y Y Y Y Y
Alarm Y
Tot a li s er
Fault
Cleaning
PV Limits Y Y Y y
On

See

page 4-42

See

page 4-53

See

page 4-54

See

page 4-54

See

page 4-54

See

page 4-55

See

page 4-56

See

page 4-56

See

page 4-57

See

page 4-57

See

page 4-57

See

page 4-59

(1) Option available on models 3491 and 3492 only.

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00809-0100-4841, Rev. AA
May 2007

Figure 4-29. Wet well application

- Stage 1 of example

Rosemount 3490 Series

Standby, Common Off Relay

This function requires two or more Standby, Common Off mode relays - only
one is energised at any one time. The On/Off points of a relay are utilised as
set points. To illustrate how the function works, here are two examples of
applications. To keep this simple, the auto-sequencing options are not
considered.

Wet Well Application (Emptying due to rising level):

Consider an application with two relays, RL1 and RL2, connected to individual
pumps in a Wet Well. The PV value (D800) is a liquid level measurement in
metres.

Initially, both pumps are off since the liquid level is at a satisfactory level,
which in this case is below 5 metres.

Figure 4-30. Wet well application

- Stage 2 of example

When the measured level exceeds 5 metres (P411, On point), the relay RL1
will be energised to start Pump 1.

If the measured level exceeds 8 metres (P421, On point), the relay RL2 will
be energised to start Pump 2. Relay RL1 is then de-energised to switch off
Pump 1.

4-45

Rosemount 3490 Series

Figure 4-31. Wet well application

- Stage 3 of example

In an emptying application, the Common Off point is always the Off point of
the Standby, Common Off mode relay with the lowest On point, which in this
example is P412 of Relay RL1 at 2 metres

Pump 2 continues to pump until the measured level falls below 2 metres
(P412, Common Off), at which relay RL2 will de-energise to switch off
Pump 2.

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May 2007

Figure 4-32. Filling tank
application - Stage 1 of example

However, if Pump 1 kept the measured level below 8 metres, it would stay
switched on until the level is 2 metres. (Safeguards to prevent over-use of the
pump are in Section “Relay Safeguard Options“ on page 4-43).

Filling Tank Application:

Consider an application with two relays, RL1 and RL2, connected to individual
valves controlling the delivery of liquid into a tank. In addition, the PV value
(D800) is a liquid level measurement in metres.

Initially, both valves are closed since the liquid level is at a satisfactory level,
which in this case is above 5 metres.

4-46

When the measured level falls below 5 metres (P411, On point), the relay RL1
will be energised to open Valve 1.

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May 2007

Figure 4-33. Filling tank
application - Stage 2 of example

Figure 4-34. Filling tank
application - Stage 3 of example

Rosemount 3490 Series

However, if the measured level falls below 2 metres (P421, On point), the
relay RL2 will be energised to open Valve 2. Relay RL1 is de-energised to
close Valve 1.

In a filling application, the Common Off point is always the Off point of the
Standby, Common Off mode relay with the highest On point, which in this
example is P412 of Relay RL1.

When the measured level rises above 8 metres (P412, Common Off), the
relay RL2 will de-energise to close Valve 2.

However, if the measured level did not fall below 2 metres, the relay RL1
would remain energised to keep Valve 1 open until the level rises to 8 metres.
(Safeguards to prevent overuse of the relay (valve) are in Section “Relay
Safeguard Options“ on page 4-43.)

4-47

Rosemount 3490 Series

Standby, Split Off Relay

This function requires two or more Standby, Split Off mode relays - only one is
energised at any one time. The On/Off points of a relay are utilised as set
points but their usage does differ to their parameter descriptions. To illustrate
how the function works, here are two examples of applications. To keep this
simple, auto sequencing is not considered.

Wet Well Application (Emptying due to rising level):

Consider an application with two relays, RL1 and RL2, connected to individual
pumps in a Wet Well. In addition, the PV value (D800) is a liquid level
measurement in metres.

Initially, both pumps are off since the liquid level is at a satisfactory level,
which in this case is below 5 metres

Figure 4-35. Stage 1 of Standby
split-off wet well example

Reference Manual

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May 2007

Figure 4-36. Stage 2 of Standby
split-off wet well example

When the measured level exceeds 5 metres (P411, On point), the relay RL1
will be energised to start Pump 1.

If the measured level exceeds 8 metres (P421, On point), the relay RL2 will
be energised to start Pump 2. Relay RL1 is then de-energised to switch off
Pump 1.

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May 2007

Figure 4-37. Stage 3 of Standby
split-off wet well example

Rosemount 3490 Series

When the measured level falls below 3.5 metres (P422, Off point), relay RL2
will de-energise to switch off Pump 2.

Relay RL1 is then energised to start Pump 1 again.

When the measured level falls below 2 metres (P412, Off point), relay RL1 will
de-energise to switch off Pump 1.

Figure 4-38. Stage 1 of Standby
split-off filling tank example

However, if Pump 1 kept the measured level below 8 metres, it would stay
switched on until the level is 2 metres. (Safeguards to prevent overuse of the
pump are in Section “Relay Safeguard Options“ on page 4-43.)

Filling Tank Application:

Consider an application with two relays, RL1 and RL2, connected to individual
valves controlling the delivery of liquid into a tank. In addition, the PV value
(D800) is a liquid level measurement in metres.

Initially, both valves are closed since the liquid level is at a satisfactory level,
which in this case is above 5 metres.

When the measured level falls below 5 metres (P411, On point), the relay RL1
will be energised to open Valve 1.

4-49

Rosemount 3490 Series

Figure 4-39. Stage 2 of Standby
split-off filling tank example

However, if the measured level falls below 2 metres (P421, On point), the
relay RL2 will be energised to open Valve 2. Relay RL1 is de-energised to
close Valve 1.

Figure 4-40. Stage 3 of Standby
split-off filling tank example

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May 2007

4-50

When the measured level rises above 6.5 metres (P422, Off point), the relay
RL2 will de-energise to close Valve 2. Relay RL1 is then energised to open
Valve 1.

When the measured level rises to 8 metres (P412, Off point), the relay RL1
de-energises to close Valve 1.

However, if the measured level did not fall below 2 metres, the relay RL1
would remain energised to keep Valve 1 open until the level rises to 8 metres.
(Safeguards to prevent overuse of the relay (valve) are in Section “Relay
Safeguard Options“ on page 4-43.)

NOTE:

For optional auto-sequences, see “Auto-Sequence (Models 3491 and 3492
only)“ on page 4-53.

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

Totaliser Relay

Menu:
MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER

Each time the internal totaliser count (D828) increments, a relay may be
allocated to provide a pulse. The duration of the pulse may set via P534.

P534 Totaliser Pulse Width (Factory default is 100)

The duration controls both the 'On' time and the 'Off' time - i.e. the pulse width

- and may be set to a value between 10ms and 2.5 seconds in steps of 10ms.

If the totaliser count is running faster than the relay can produce pulses, an
internal accumulator stores the excess pulses; they will be produced by the
Totaliser relay once the totaliser count rate reduces.

Sampler Relay

Sampler relays output pulses at a slower rate than a Totaliser relay. The
Sampler relay can be used as a coarse totaliser or as a trigger to an external
event.

Menu:
MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER

P535 Sampler Factor (Factory default is 0)

This is for defining the frequency of the Sampler pulse. For example, a value
of 100 means that the Sampler relay outputs a single pulse for every 100th
increment to the Totaliser Count (D828/D829). The pulse width is the same as
selected for the Totaliser relay (P534). For information on setting up the
totaliser, see page 4-63 onwards.

Fault Relay

A Fault relay is de-energised when a particular fault condition exists.
Parameter D831 is a fault report and shows a list of active faults. Table 4-15
on page 4-62 has a summary of reporting methods for faults.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / FAULT

P560 System Fault (Factory default is "Both")

The Fault relay is de-energised when there is a system fault and the option
selected is "Both" or "Relay".

P561 CU Temp Fault (Factory default setting is "None")

The Fault relay is de-energised if the temperature of the CPU rises above
65°C, and the option selected is "Both" or "Relay". Parameter D844 shows
the operating temperature of the 3490 Series Control Unit.

P562 Xmtr Fault (Factory default setting is "None")

The Fault relay is de-energised when the transmitter signals a fault and the
option selected is "Both" or "Relay".

Faults can be indicated on the Current Output if you select the "Current" or
"Both" options. See also the Alarm Action parameter (P402) description in
Section “Current Output“ on page 4-39.

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Rosemount 3490 Series

PV limits Relay

This relay mode uses the On/Off points (e.g. P411 and P412) as an Alarm
relay. The points are used as limits for the PV value (D800). Limit values can
be in any order - the relay is energised while the PV value exceeds the higher
limit value or while it is below the lower limit value.

Rate of Change Relay

A rate of change value for the parameter D800 (PV value) is calculated every
5 seconds in units of PV per minute:

D809 = (PVnow - PV5 seconds ago) * 12

The On and Off points of a Rate of Change (RoC) mode relay are used as
high and low limits for D809. Limit values are in units of PV per minute
(PV/min) and can be in any order - the relay is energised while D809 exceeds
the higher limit value or falls below the lower limit value.

Typically, where the PV value is a liquid level measurement, the RoC relay
can be used to warn of a quickly rising (or falling) liquid level. Alternatively, the
RoC mode relay can be used for controlling the rate of liquid flow.

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Table 4-13.
Auto-Sequence Options

Also, see “Pump Efficiency Alarm (Models 3491 and 3492 only)“ on page 4-57
and “Pumped Volume Totalising“ on page 4-59 for further uses of D809.

Auto-Sequence (Models 3491 and 3492 only)

(Special Control Function - see Table 4-12 on page 4-45)

Optional rotation of leading (most used) relay can be applied to Assist or
Standby mode relays, but not both. To use these options, two or more relays
must have the same mode. The lowest numbered relay is initially the lead
relay.

NOTE:

Rotation of relays is performed without the actual swapping of values between
relay parameters.

P270 Auto Seq Enable (Factory default is "Off")

Select a rotation auto-sequence. All options are summarised in Table 10
(below).

P271 Auto Seq Qual (Factory default is 0)

This defines the threshold to be established (e.g. how many times, ratio of
starts, etc.) before applying an auto-sequence to rotate the 'lead' to the next
relay with the same mode.

Option Rotation basis

Standby Starts For Standby mode relays only - rotation is based on how many times

Stdby On Time For Standby mode relays only - rotation is based on the hours that the

Stdby Ratio T For 2 Standby mode relays only - rotation is based on the ratio of ON

Stdby Ratio S For 2 Standby mode relays only - rotation based on the ratio of starts

the 'leading' relay has been energised compared to parameter P271.

'leading' relay has been energised compared to parameter P271.

time for 2 relays compared to P271.

(times energised) compared to P271.

(1)

(1)

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May 2007

Rosemount 3490 Series

Option Rotation basis

Assist Starts Rotation of 'leading' Assist relay is based on how many times it has

been energised compared to P271.

Assist On Time Rotation of 'leading' Assist relay is based on the hours that it has been

energised compared to P271.

Assist Ratio T For 2 Assist relays only - rotation based on the ratio of ON time for the

2 relays compared to P271.

Assist Ratio S For 2 Assist relays only - rotation based on the ratio of starts (times

energised) compared to P271.

Off, No rotation required.

(1) Ratio is based on the first two lowest numbered relays with the same mode.

Energy Saving

(Special Control Function - see Table 4-12 on page 4-45)

P275 Engy Save Strt (Factory default is 0:00 h:m)

Set the time of day at which selected relays (P276) will energise until each
relay Off Point is reached. The energy saving start time is valid for one
minute; if missed by the 3490 Series Control Unit being off-line, no action is
taken when subsequently put back on-line.

(1)

(1)

P276 Engy Save RL (Factory default is 00000)

Select relays for the operation associated with parameter P275. Each digit
represents a relay. Relay RL1 is selected by editing the first digit to be a "1".
Similarly, relay RL5 is selected with the fifth digit. To de-select a relay, change
the appropriate digit back to a "0".

Scum line prevention (models 3491 and 3492 only)

(Special Control Function - see Table 4-12 on page 4-45)

P277 Scum line var (Factory default is 0.0)

This parameter defines the maximum overall variance in the programmed
On/Off point of selected relays (P278). The variance is in the units of the
On/Off point, spaced in 10 equal increments inside the On/Off points. Each
time the selected relays (P278) de-energise, the variance moves on an
increment.

P278 Scum line RL (Factory default is 00000)

Select relays for the operation associated with parameter P277. Each digit
represents a relay. Relay RL1 is selected by editing the first digit to be a "1".
Similarly, relay RL5 is selected with the fifth digit. To de-select a relay, change
the appropriate digit back to a "0".

Pump-down (Models 3491 and 3492 only)

(Special Control Function - see Table 4-12 on page 4-45)

Normally, when pumping out a wet-well, the lowest Off point ('pump off' level)
will be a fixed level above the Bottom Reference point. However, it is
sometimes required to make the pumps continue to run for a period past the
Off point or run down to the Bottom Reference Point. This will clear the sump
of sludge that may have collected at the bottom.

4-53

Rosemount 3490 Series

Pump-down can be initiated automatically at pre-set intervals. A digital input
can also initiate pump-down at any time and this will re-set the interval before
the next pump-down. For details on configuring a digital input, see Section
“Digital Inputs IN1 and IN2“ on page 4-34.

Pump-down will automatically stop when the parameter D800 (PV) is zero or
after 20 minutes (maximum) if a pump-down duration (P274) has not been
programmed, whichever is the shorter period.

P272 Pump down RL (Factory default is 00000)

This is for allocating individual relays to pump-down duty. However, the mode
of the relay must be Set point, Assist or Standby. Each of the five digits
represents a relay. Relay RL1 is selected by editing the first digit to a "1".
Similarly, relay RL5 is selected by editing the fifth digit. To de-allocated, edit
the appropriate digit back to a "0".

P273 Pump down Int (Factory default is 000:00 h:m)

This defines a fixed interval (hours and minutes) between pump-downs.

P274 Pump down Dur (Default setting is 00:00)

This defines the period (hours and minutes) that the relay will remain
energised for the pump-down. (Safeguards may extend or reduce this period ­see Section “Relay Safeguard Options“ on page 4-43.)

Reference Manual

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May 2007

NOTE:

For any of the alarms below to be indicated by a relay or current output, an
indication method must be selected. See Section “Alarm indication selection“
on page 4-60 for details.

D845 Next pump-down h:m (Factory default is 000:00)

This shows the time remaining before the next pump-down is invoked. Display
shows 000:00 if pump-down is in progress or it is not used.

Custom

(Special Control Function - see Table 4-12 on page 4-45)

Menu:
MAIN MENU / SETUP / [CONTROL UNIT /] DUTY(Mode) / CUSTOM

P250 Start On (Factory default is "None")

Relay energises when the criteria, as set by an option code, is true. See Table
4-14 on page 4-56.

P251 Stop On (Factory default is "None")

Relay de-energises when the criteria, as selected by an option code, is true.
See Table 4-14 on page 4-56.

P252 Stop If (Factory default is "None")

Relay de-energises when the criteria, as selected by the option code, is true.
See Table 4-14 on page 4-56. This is a fail-safe for P251.

4-54

P253 Start Time (Factory default is "7:00" - i.e. 7AM)

This defines the clock time that a Custom relay operation will
begin (if P250 = "Time"), or end (if P251 = "Time").

Reference Manual

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May 2007

Rosemount 3490 Series

P254 Interval (Factory default is "1:00" i.e. 1hr 0min)

This is for defining the interval for repeating a Custom relay operation. P255
and P256 are for setting up a second starting time and an associated interval.

P257 Max Retries (Factory default is 10)

This defines the maximum number of failed attempts to perform Custom relay
operations before it is deemed an alarm condition. This situation can occur if
the 3490 Series Control Unit is off-line, preventing all Custom relay operations
from starting. In addition, it can occur when the maximum On time (relay
safeguard, page 4-43) for a relay prevents a Custom relay operation from
completing. For alarm indication options, see Section “About Alarms“ on
page 4-60.

Table 4-14.
P250/P251/P252 Options

Options

None Switched off Yes Yes Yes
Time P253 and P254 determine when the relay

PV > Level While PV value (D800) is greater than On

PV < Level De-energise relay when PV value (D800)

Ext Trig Energise a relay only while a digital input

Ext Trig Xs If Digital Input is active, energise relay

(1)

Purpose of option P250 P251 P252

is to be energised

point for relay, energise relay

less than the On point for relay

is active. This does not require Digital
Input IN1 or IN2 to be allocated an action

after X seconds delay. This does not
require Digital Input IN1 or IN2 to be
allocated an action

(1) Abbreviations: "Ext Trig" = External Trigger (Digital Input)

Yes Yes -

Yes - -

- Ye s Ye s

-YesYes

- - Ye s

Relay Operations Alarm

(Special alarm - see Table 4-12 on page 4-45)

P491 RL operations (Factory default is 0)

It is an alarm condition when the number of operations of a specified relay
(P492) exceeds the number in P491. For alarm indication options, see “About
Alarms“ on page 4-60.

P492 RL ops rly sel (Factory default is "Disabled")

Select the relay for the monitoring operation associated with parameter P491.

Relay operation counters are parameters D811 to D815, located in the
MONITOR menu - see “Health Check: 3490 Series Control Unit“ on page 5-2.

Relay Run Time Alarm

(Special alarm - see Table 4-12 on page 4-45)

P493 RL runtime (Factory default is 0:00 h:m = OFF)

It is an alarm condition when a specified relay (P494) has been energised for
longer than the period (hours and minutes) defined by P493. For alarm
indication options, see “About Alarms“ on page 4-60.

P494 RL run rly sel (Factory default is "Disabled")

Select the relay for the monitoring operation associated with parameter P493.

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Rosemount 3490 Series

Run time counters for all relays are D821 to D825, located in the MONITOR
menu - see “Health Check: 3490 Series Control Unit“ on page 5-2.

No Activity Alarm

(Special alarm - see Table 4-12 on page 4-45)

P497 No Activity Del (Factory default is 0:00 h:m)

It is an alarm condition if there is no relay activity for the period (hours and
minutes) defined by parameter P497. This is to be used with parameter P498.
The alarm condition is cleared when any monitored relay is energised. For
alarm indication options, see “About Alarms“ on page 4-60.

P498 No Activity RL (Factory default is 00000)

Select relays for monitoring operation associated with relay inactivity. Each
digit represents a relay. Relay RL1 is selected for monitoring by editing the
first digit to be a "1". Similarly, relay RL5 is selected with the fifth digit. To
de-select a relay, change the appropriate digit back to a "0". This parameter is
to be used with parameter P497.

Rising Level Alarm

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May 2007

(Special alarm - see Table 4-12 on page 4-45)

P490 R Lev alrm del (Factory default is 0:00 m:s)

The rising level alarm requires at least one Assist or Standby relay.

If any Standby relay is energised, monitoring of the rising level is enabled.
However, in the case of Assist relays, they must all be energised for
monitoring of the rising level to be enabled.

Once the monitoring is enabled, a timed delay (P490) starts. After the delay
time (P490) and the level is still rising, there will be a 'Rising Level' alarm
condition if the Rate of Change of the PV is positive. The alarm stops when
the Rate of Change of the PV is negative, indicating a falling level.

For the Rising Level Alarm to be indicated by a relay or the Current Output, a
method must be selected - see “About Alarms“ on page 4-60.

Also, see Section “Rate of Change Relay“ on page 4-53 for details of the Rate
of Change calculation.

Pump Efficiency Alarm (Models 3491 and 3492 only)

(Special alarm - see Table 4-12 on page 4-45)

The pump efficiency feature allows you to indicate an alarm (P550, P4x1) if
the calculated pump efficiency falls below a defined limit (P495).

P495 Pump effy limit (Factory default is 0% = OFF)

It is an alarm condition if the calculated pump efficiency falls below the limit
defined by P495 in %. The pump efficiency calculation is based on the Rate of
Change of the 3490’s PV and is independently monitored for each selected
relay (P496),

4-56

For alarm indication options, see “About Alarms“ on page 4-60.

P496 Pump effy RL (Factory default is 0000)

Reference Manual

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May 2007

Rosemount 3490 Series

Select relays for monitoring operation associated with the pump efficiency
limit. Each digit represents a relay. Relay RL1 is selected by editing the first
digit to be a "1". Similarly, relay RL4 is selected with the fourth digit. (Relay
RL5 does not support this feature.) To de-select a relay, change the
appropriate digit to a "0". This parameter is to be used with parameter P495.

Pump efficiency values for relays are saved in D861 to D864, located in the
MONITOR menu - see “Health Check: 3490 Series Control Unit“ on page 5-2.

Pump Efficiency Explanation

Pump efficiency (PE) is calculated based upon the rate of Change (RoC) of
the MCU PV whilst any single pump is on.

The pump efficiency value, (D86*, where “*” is the number of the associated
pump relay 1 - 4) is calculated only whilst that pump is operating. The
calculations will pause when the pump stops or when other pumps start.
Calculations re-start when the relevant pump starts again.

To calculate the pump efficiency, the 3490 Series Control Unit assumes that
liquid continues to enter the well or tank during pump operation at the rate just
prior to the pump starting.

The 3490 Series Control Unit continuously calculates the RoC of the PV,
making a new measurement every 5 seconds, as described in Section “Rate
of Change Relay“ on page 4-53. Once the selected pump starts, the 3490
Series Control Unit will monitor and record the change in RoC over the next 5
measurements. Over the next 9 pump starts, a further 9 change of RoC
values are stored such that the 3490 can then calculate an average value in
change of RoC. This average value, "RoC100" is then taken as being
equivalent to the pump operating at 100% efficiency. A value of 100% is then
stored in D86*.

Each pump start, and change in RoC thereafter, is used in a rolling average
calculation for a new average value in change of RoC, RoCnew, which is then
compared to the previous value "RoC100" and a new PE percentage value
calculated using:

PE % = (RoCnew / RoC100) * 100

If the resulting percentage is greater than 100%, then the RoC100 is updated
to the new value and the PE re-stated as 100% based on this new value.

If the resulting percentage is less than 100%, then the PE is calculated as
above and stored in D86*

If the PE is below the limit set (P495), the PE alarm condition is true - to
indicate an alarm by relay or current output, a method must be selected - refer
to “About Alarms“ on page 4-60.

NOTE:

The alarm condition is automatically cleared if the calculated PE rises above
the limit (P495) by 5% or more.

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Rosemount 3490 Series

Pumped Volume Totalising

(Totaliser Option - see Table 4-12 on page 4-45)

This function may be used to determine the total throughput of a well.

NOTE:

The "Totaliser" Wizard can be used to set-up Pumped Volume Totalising - see
Section “Totaliser Wizard“ on page 4-67.

The 3490 Series Control Unit monitors what goes into the well when no
pumps are running. It calculates the Rate of Change (RoC) of PV every 5
seconds and then converts it to a Rate of Change per minute for displaying as
parameter D809.

When a pump is turned on, the 3490 Series Control Unit assumes that the
rate of inflow remains the same as it was just before starting the pumps. The
RoC value (D809) is frozen whilst the pumps are on, i.e. when any Assist or
Standby relay is energised.

In order to totalise pumped volume, the PV value (D800) must be in volume
units so that the RoC value is in volume units per minute. The 3490 Series
Control Unit integrates this volume every second and increments the totaliser
for every integer unit.

Therefore, if the RoC value (D809) is 12m
(P530) is set to 1.0 (m
5 seconds (1/12th of a minute = 5 seconds).

Reference Manual

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May 2007

3

3

), the Totaliser Count (D828) will increment every

per minute and the total factor

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER

P530 Total factor (Factor default is 0.0)

One count is added to the Totaliser Count (D828) for a quantity of liquid as
defined by this parameter.

P531 Total units (Factory default is "None")

Pumped Volume Totalising is selected by the totaliser units (P531) being set
to "PVol". (This parameter defines the display units for parameter D828).

NOTE:

For other associated parameters, see “About Totalising On Model 3491“ on
page 4-63.

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May 2007

About Alarms Alarms

The 3490 Series Control Unit can detect the following alarm conditions:

• PV value out-of-limits.

• Current Output saturated
(Standard:

• Logging memory filling (model 3493 only).

• Logging memory full (model 3493 only).

• Digital input is configured to force an alarm when active.

• Maximum number of failed Custom relay operation attempts.

• Current Input saturated.

• Rising liquid level.

• Relay operation count limit exceeded.

• Relay run time limit exceeded.

• Low pump efficiency (models 3491 and 3492 only).

• Relay inactivity.

Rosemount 3490 Series

≤ 3.9mA or ≥ 20.8mA, NAMUR NE43: ≤ 3.8mA or ≥ 20.5mA)

Parameter D830 shows a list of active alarms. In addition, alarms are
indicated by means of Relays, Current Output, or both (see below).
Table 4-15 on page 4-62 has a summary of reporting methods for alarms.

Alarm indication selection

For each alarm listed in Section “Alarms“ on page 4-60, there is a dedicated
parameter in the ALARM menu for selecting the method of indication for that
alarm.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / ALARM

P540 PV Over Limits (Factory default is "None")

Select the indication method for the alarm condition that occurs if the PV
value is outside pre-set limits.

See also Section “PV limits Relay“ on page 4-53.

P541 mA Out Sat (Factory default is "None")

Select the indication method for the alarm condition that occurs if the
Current Output is

P542 Log mem filling (Factory default is "None")

Select the indication method for the alarm condition that occurs if the
available logging memory is low. See also Section “P593: Low Memory
Alarm“ on page 4-35.

P543 Digital Input (Factory default is "None")

≤ 3.8mA or ≥ 20.5mA

Select the indication method for the alarm condition that only occurs if a digital
input is configured to force this alarm and that digital input is active - see
Section “Digital Inputs IN1 and IN2“ on page 4-34.

P544 Max retries (Factory default is "None")

Select the indication method for the alarm condition that only occurs if a
Custom relay operation is unable to complete as specified, even after a
pre-set number of attempts (P257). See also Section “Custom“ on page 4-55.

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Rosemount 3490 Series

P545 mA In Sat (Factory default is "None")

Select the indication method for the alarm condition that occurs if the Current
Input is

P547 Rising Level (Factory default is "None")

Select the indication method for the alarm condition that occurs if the PV
value is increasing (or decreasing) at a rate that exceeds is a programmed
threshold. See also Section “Rising Level Alarm“ on page 4-57.

P548 RL Operations (Factory default is "None")

Select the indication method for the alarm condition that occurs if a relay
operation counter exceeds a pre-set limit.

See also Section “Relay Operations Alarm“ on page 4-56.

P549 RL runtime (Factory default is "None")

Select the indication method for the alarm condition that occurs if a relay is
energised for longer than a pre-set period.

See also Section “Relay Run Time Alarm“ on page 4-56.

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May 2007

≤ 3.7mA or ≥ 20.75mA.

P550 Pump efficiency (Factory default is "None")

On models 3491/3492 only. Select the indication method for the alarm
condition that occurs if the calculated pump efficiency falls below a pre-set
limit. See also Section “Pump Efficiency Alarm (Models 3491 and 3492 only)“
on page 4-57.

P531 No activity (Factory default is "None")

Select the indication method for the alarm condition that occurs if any
selected relay is de-energised for longer than a pre-set period. See also
Section “No Activity Alarm“ on page 4-57.

Options for parameters P540 to P551 are:

• None - if the alarm will not to be indicated

• Both - alarm indicated by Relay Output (see below) and Current Output

• Current - alarm will be indicated by the Current Output

• Relay - alarm will be indicated by Relay Output (see below)

If the indication method for a particular alarm is a Relay Output (e.g. RL1), the
mode of a relay (e.g. P411) must first be set to the "Alarm" option. After this is
set-up, all 'Alarm duty' relays are energised while the alarm condition exists.
When there is no alarm condition (or the alarm condition has ceased), 'Alarm
duty' relays are de-energised.

More than one Relay Output can be allocated to alarm duty, if required. On
the primary display, the relay status icon shows an "A" if it is allocated to alarm
duty and the relay is energised.

4-60

(For information on relays, see also “Relays“ on page 4-40.)

If the indication method is the Current Output, parameter P402 is used to
determine how the Current Output will indicate an alarm condition - see
Section “Current Output“ on page 4-39 for alarm action options.

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May 2007

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Rosemount 3490 Series

Table 4-15. Reporting of Alarms and Faults

CATEGORY SOURCE CAUSE AS SEEN ON-SCREN

STATUS

LED

PRIMARY

DISPLAY

Pxxx

SCREEN

RELAY

CURRENT

OUTPUT

ALARM

REPORT

(D830)

FAU LT

REPORT

(D831)

ALARM 3490 Current Output reached linear limit mA o/p Sat Yes Yes Yes

Logging memory almost full Lg Mem Filling Yes Ye s Ye s
Logging memory is full Log Mem Full Yes Yes
Digital Input 1 active Digital In 1 Ye s Yes Ye s
Digital Input 2 active Digital In 2 Yes Yes Yes
Alarm suppressed by digital input Alarm Suppressed Yes
Custom relay operation retries exceeded Max Retries Yes Yes Yes
Current input below lower linear limit mA In Low Ye s Yes Yes
Current input above higher linear limit mA In High Yes Yes Yes
Raising level despite relays on Rising Level Yes Yes Ye s
Relay number of operations exceeded Relay Operations Yes Yes Yes
Relay run-time exceeded Relay Runtime Yes Yes Ye s
Pump efficiency below limit

(1)

(1) Pump efficiency feature is on models 3491 and 3492 only.

Pump Efficiency Yes Yes Yes

No activity of Control Relay No activity Ye s Yes Yes

XMTR Transmitter PV out-of-limits PV OL Yes Yes

FAU LT 3 490

Rom checksum error ROM Error On Yes Yes Yes Ye s
RAM test error RAM Error On Yes Yes Yes Yes
Real Time Clock Fault Clock fault On Ye s Ye s Ye s Ye s
EEPROM Signature Error EEPROM Sig err On Yes Yes Yes Yes
EEPROM checksum error EEPROM CKS err On Yes Yes Yes Ye s
ADC error ADC_error On Yes Yes Yes Yes
Control Unit temperature out-of-limits CU Temp OL On Yes Y Ye s

Xmtr Field Device Malfunction Xmtr Fault On Yes Yes Yes Yes

Rosemount 3490 Series

Reference Manual

00809-0100-4841, Rev. AA

May 2007

About Totalising On
Model 3491

Totaliser (Cumulative totalised flow) on Model 3491

Model 3491 has one internal, 8-digit, totaliser, which is updated several times
per second. A Totaliser relay can be configured to output a pulse for each
increment to the Totaliser Count parameter. For information on setting up a
relay to output 'totaliser' pulses, see “Relays“ on page 4-39.

NOTE:

For totalising examples, see “Totalising examples“ on page 4-67.

NOTE:

Totalisers are set-up to operate with an input of PV in units/second. If the PV
value is a volumetric flow rate (e.g. m
volume of flow, therefore giving the total volume throughput.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER

P530 Total factor (Factor default is 0.0)

One count is added to the Totaliser Count (D828) for a quantity of liquid as
defined by this parameter. The display units for D828 is defined by P531.

P531 Total units (Factory default is "None")

This parameter defines the units for the Totaliser Count (D828).

When using units of gal (US gallons), an 8-digit totaliser increments rapidly
and rolls over too frequently. To help with this, alternative totaliser units of
galx10, galx100, and galx1000 are available for selection. When these
special units are selected after selecting gal units, the totaliser factor (P530)
is automatically re-scaled by x10, x100, or x1000 depending on the selection.

3

/hour), the totaliser can accumulate this

NOTE:

If requiring Pumped Volume Totalising, see page 4-58.

P534 Pulse Width (Factory default is "100ms")

A Totaliser relay is energised for a programmed duration (P534) each time the
Totaliser Count (D828) is incriminated. Parameter P534 controls the 'On' time
and 'Off' time - i.e. the pulse width - and may be a value of between 10ms and

2.5s, changeable in steps of 10ms.

The rate at which the unit can output a totaliser pulse is entirely dependent on
the pulse width. Parameter P534 also determines the width of a pulse that is
output by a Sampler relay (see “Sampler Relay Output“ on page 4-66).

Menu:
MAIN MENU / MONITOR / [CONTROL UNIT /] READINGS / TOTALISER

D828 Totaliser

This parameter displays the Totaliser Count. To add this to the primary
display, see “Primary Display Options“ on page 4-71.

Resetting the totaliser On Model 3491

To re-set a totaliser to zero, display the Totaliser Count parameter e.g. D828,
and then press the button corresponding to "Reset" on display line 4.

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Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

This parameter displays the Totaliser Count. To add this to the primary
display, see “Primary Display Options“ on page 4-72.

Resetting the totaliser On Model 3491

To re-set a totaliser to zero, display the Totaliser Count parameter e.g. D828,
and then press the button corresponding to "Reset" on display line 4.

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Rosemount 3490 Series

Reference Manual

00809-0100-4841, Rev. AA

May 2007

About Totalising on
Model 3492

Model 3492 has two independent, internal, 8-digit, totalisers - Totaliser 1 and
Totaliser 2 - which are updated several times per second.

Totaliser 1 is dedicated to totalising the PV value (D800). When the PV value
is a volumetric flow rate (e.g. m3/hour), the totaliser can accumulate this flow,
therefore giving the total volume throughput.

Totaliser 2 operates in the same way as Totaliser 1, but counts the parameter
selected by P536. Parameter P536 offers a choice of PV, SV, TV, and FV.

A Totaliser relay can be configured to output a pulse for each increment (by
one) to the Totaliser 1 or 2 Count parameter. For information on setting up a
relay to output 'totaliser' pulses, see Sections “Relays“ on page 4-40 and
“Totalising examples“ on page 4-68.

NOTE:

For totalising examples, see “Totalising examples“ on page 4-68.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER

P530 Total 1 factor (Factor default is 0.0)

One count is added to the Totaliser Count (D828) for a quantity of flow as
defined by this parameter. The unit of measurement for D828 is defined by
parameter P531.

P531 Total 1 units (Factory default is "None")

This parameter defines the units for the Totaliser 1 Count (D828)

When using units of gal (US gallons), an 8-digit totaliser increments rapidly
and rolls over too frequently. To help with this, alternative totaliser units of
galx10, galx100, and galx1000 are available for selection. When these
special units are selected after selecting gal units, the totaliser factor (P530)
is automatically re-scaled by x10, x100, or x1000 depending on the selection.

NOTE:

If requiring Pumped Volume Totalising, see page 4-59.

P532 Total 2 factor (Factor default is 0.0)

One count is added to the Totaliser 2 Count (D829) for a quantity of liquid as
defined by this parameter. The units for D829 is defined by P533.

P533 Total 2 units (Factory default is "None")

This parameter defines the units for the Totaliser 2 Count (D829).

When using units of gal (US gallons), an 8-digit totaliser increments rapidly
and rolls over too frequently. To help with this, alternative totaliser units of
galx10, galx100, and galx1000 are available for selection. When these
special units are selected after selecting gal units, the totaliser factor (P530)
is automatically re-scaled by x10, x100, or x1000 depending on the selection.

NOTE:

If requiring Pumped Volume Totalising, see page 4-59.

4-64

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

P534 Pulse Width (Factory default is "100ms")

A Totaliser relay is energised for a programmed duration (P534) each time a
Totaliser Count (D828/D829) is incriminated. Parameter P534 controls the
'On' time and 'Off' time - i.e. the pulse width - and may be a value of between
10ms and 2.5s, changeable in steps of 10ms.

The rate at which the unit can output a totaliser pulse is entirely dependent on
the pulse width. Parameter P534 also determines the width of a pulse that is
output by a Sampler relay - see “Sampler Relay Output“ on page 4-67.

P536 Totaliser 2 Source (Factory default is "None")

If requiring Totaliser 2, select a parameter to be totalised.

Menu:
<MAIN MENU>/<MONITOR>/[<CONTROL UNIT>/] <READINGS>/ <TOTALISER>

D828 Totaliser 1

This parameter displays the Totaliser 1 Count. To add this to the primary
display, see “Primary Display Options“ on page 4-72.

D829 Totaliser 2

About Totalising on
Model 3493

This parameter displays the Totaliser 2 Count. To add this to the primary
display, see “Primary Display Options“ on page 4-72.

Resetting the totaliser

To re-set a totaliser to zero, display the Totaliser Count parameter e.g. D828,
and then press the button corresponding to "Reset" on display line 4.

Model 3493 has two totalisers:

Totaliser 1 (Cumulative totalised flow) on Model 3493

This is an 8-digit totaliser showing cumulative totalised flow through a flow
structure. It can only be re-set manually.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER

P530 Total 1 Factor (Factor default is 0.0)

One count is added to the Totaliser Count (D828) for a quantity of liquid as
defined by this parameter. The display units for D828 is defined by P531.

P531 Total 1 Units (Factory default is "None")

This parameter defines the units for the Totaliser Count (D828).

When using units of gal (US gallons), an 8-digit totaliser increments rapidly
and rolls over too frequently. To help with this, alternative totaliser units of
galx10, galx100, and galx1000 are available for selection. When these
special units are selected after selecting gal units, the totaliser factor (P530)
is automatically re-scaled by x10, x100, or x1000 depending on the selection

P534 Pulse Width (Factory default is "100ms")

A Totaliser relay is energised for a programmed duration (P534) each time the
Totaliser Count (D828 / D829) is incremented. Parameter P534 controls the
'On' time and 'Off' time - i.e. pulse width - and may be a value of between
10ms and 2500ms (0.01 to 2.5 seconds), changeable in steps of 10ms.

4-65

Rosemount 3490 Series

The maximum rate at which the unit can output a totaliser pulse is entirely
dependent on the pulse width. Parameter P534 also determines the width of a
pulse that is output by a Sampler relay. (See “Sampler Relay“ on page 4-52).

Menu:
MAIN MENU / MONITOR / [CONTROL UNIT /] READINGS / TOTALISER

D828 Totaliser 1

This displays the Totaliser 1 count, which is the cumulative totalised flow. To
add this to the primary display, see “Primary Display Options“ on page 4-72.

Totaliser 2 (Daily totalised flow) on Model 3493

This is an 8-digit totaliser showing daily total flow (midnight to midnight)
through a flow structure. It is automatically re-set to zero at each midnight.

A Totaliser relay can be configured to output a pulse for each increment (by
one) to the Totaliser Count parameter. For information on setting up a relay to
output 'totaliser' pulses, see Section “Relays“ on page 4-40.

NOTE:

For totalising examples, see “Totalising examples“ on page 4-68.

Reference Manual

00809-0100-4841, Rev. AA

May 2007

NOTE:

Totalisers are set-up to operate with an input of PV in units/second. If the PV
value is a volumetric flow rate (e.g. m
volume of flow, therefore, giving the total volume throughput.

Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / TOTALISER

P532 Total 2 Factor (Factor default is 0.0)

One count is added to the Totaliser 2 Count (D829) for a quantity of liquid as
defined by this parameter. The display unit of measurement for D829 is
defined by parameter P533.

P533 Total 2 Units (Factory default is "None")

This parameter defines the units for the Totaliser 2 Count (D829).

P534 Pulse Width (Factory default is "100ms")

A Totaliser relay is energised for a programmed duration (P534) each time the
Totaliser Count (D828 or D829) is incremented. Parameter P534 controls the
'On' time and 'Off' time - i.e. pulse width - and may be a value of between
10ms and 2500ms (0.01 to 2.5 seconds), changeable in steps of 10ms.

The maximum rate at which the unit can output a totaliser pulse is entirely
dependent on the pulse width. Parameter P534 also determines the width of a
pulse that is output by a Sampler relay - see “Sampler Relay Output“ on
page 4-67.

3

/hour), the totaliser can accumulate this

4-66

P536 Total 2 Source (Factory default is "MCU PV")

Use this parameter to select whether the MCU PV (D800), MCU SV (D801),
MCU TV (D802) or MCU FV (D803) value is to be totalised over a 24 hours
period for the Totaliser 2 Count (D829). Alternatively, select "None" if not
requiring Totaliser 2.

Reference Manual

00809-0100-4841, Rev. AA
May 2007

Rosemount 3490 Series

For details of (MCU) PV, SV, TV, and FV, see “Transmitter inputs to the 3490“
on page 4-13.

P537 Total 2 dec pl (Factory default is 1)

Use this parameter to set the number of decimal places to be shown when
displaying the Totaliser 2 Count (D829).

Menu:
MAIN MENU / MONITOR / [CONTROL UNIT /] READINGS / TOTALISER

D829 Totaliser 2

This parameter displays the Totaliser 2 Count, which is the daily flow total for
the present day. It is reset to zero at midnight.

To add this value to the primary display, see “Primary Display Options“ on
page 4-72. When showing on the Upper display, use the LEFT-ARROW or
RIGHT-ARROW buttons to scroll through daily flow totals from the previous
365 days. The ESCAPE button restores the Upper display to show the daily
flow total value for the present day.

Resetting the totalisers on Model 3493

To reset a totaliser to zero, display the Totaliser Count parameter (e.g. D828),
and then press the button that corresponds to "Reset" option on display line 4.

Totaliser 1 may have password (PIN) protection to prevent unauthorised
persons from re-setting the total. See “PIN Security“ on page 4-75 for full
details of PIN security.

Totaliser 2 does not have password (PIN) protection and may be reset at any
time using the procedure above for parameter D829.

Sampler Relay Output

A Sampler mode relay can be used as a coarse totaliser or as a trigger to an
external event. They output a pulse at a slower rate than a Totaliser relay.

Parameter P535 is a Sampler Factor that defines the frequency of the
Sampler pulse. For example, a value of 100 means that the Sampler relay
outputs a single pulse for every 100th increment to the Totaliser Count
(D828/D829).

The pulse width is the same as selected for the Totaliser relay (P534).

For information on setting up a Sampler relay, see Sections “Relays“ on
page 4-40 and “Totalising examples“ on page 4-68.

Totaliser Wizard

A Totaliser can be set-up easily using the "Totaliser" Wizard, accessible by
navigating to the TOTALISER menu screen.

This Wizard requires the totaliser source parameter (e.g. PV value) to have
suitable units selected (e.g. m
message and then exit to the menu upon pressing the appropriate button.

See “Totalising examples“ on page 4-68 for examples using this Wizard.

3

/hour). Otherwise, it will display a 'invalid units'

4-67

Rosemount 3490 Series

Figure 4-41. Navigating to the
TOTALISER Menu

The SELECT INSTRUMENT menu is skipped automatically if there are no HART transmitters.
(Model 3491 screens are shown.)

Totalising examples NOTE:

Totalisers are set-up to operate with an input of flow in units of flow/second.

Example 1

Reference Manual

00809-0100-4841, Rev. AA

May 2007

Consider a flow measurement application where the PV value is a flow rate in
units of litres per second and the maximum flow rate is 200 litres per second.

For the Totaliser to count every m
(P530/P532) must be set to 1000, and the Totaliser Units (P531/P533) must
be set to m

3

.

3

(1000 litres), the Totaliser Factor

The 3490 Series Control Unitt will then add 1 to the Totaliser Count (D828 /
D829) for every 1000 litres that flows. The Totaliser Count (D828 / D829) will
be automatically displayed in m

3

by setting the Totaliser Units.

Figure 4-42 shows how the "Totaliser" Wizard is used to set-up this totalising
example. It is assumed the PV value is a flow rate in units of litres per second,
which is set-up using the "Duty" Wizard.

In addition, for this example:

• Relay 4 (RL4) will be a Totaliser relay and output a 100 millisecond pulse
(P534) for every m

3

added to the Totaliser Count.

(To set-up this manually, see Section “Relays“ on page 4-40.)

• Relay 3 (RL3) will be a Sampler relay that will output a pulse for every
200th m

3

added to the Totaliser Count.

(To set-up this manually, see Section “Relays“ on page 4-40.)

• The Totaliser will not freeze while a digital input is active.

4-68