Rosemount 2051 with Selectable HART with 4-20 mA HART (Revision 5 and 7) protocols Manuals & Guides

Reference Manual

00809-0100-4107, Rev CB

Rosemount™ 2051 Pressure Transmitter

with HART® Revision 5 and 7 Selectable Protocol

September 2020

Safety messages

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.

See listed technical assistance contacts.

Customer Central

Technical support, quoting, and order-related questions.

United States - 1-800-999-9307 (7:00 am to 7:00 pm CST)

Asia Pacific- 65 777 211

Europe/ Middle East/Africa - 49 (8153) 9390

North American Response Center

Equipment service needs.

1-800-654-7768 (24 hours—includes Canada)

Outside of these areas, contact your local Emerson representative.

CAUTION

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 Emerson Sales Representative.

WARNING

Explosions can result in death or serious injury.

Do not remove the transmitter covers in explosive environments when the circuit is live.

Fully engage both transmitter covers to meet explosion-proof requirements.

Before connecting a communicator in an explosive atmosphere, make sure the instruments in the loop are installed in accordance
with intrinsically safe or non-incendive field wiring practices.

Verify the operating atmosphere of the transmitter is consistent with the appropriate hazardous locations certifications.

Electrical shock could cause death or serious injury.

Avoid contact with the leads and terminals.

Process leaks could result in death or serious injury.

Install and tighten all four flange bolts before applying pressure.

Do not attempt to loosen or remove flange bolts while the transmitter is in service.

Replacement equipment or spare parts not approved by Emerson or use as spare parts could reduce the pressure retaining
capabilities of the transmitter and may render the instrument dangerous.

Use only bolts supplied or sold by Emerson as spare parts.

Improper assembly of manifolds to traditional flange can damage SuperModule™ Platform.

For safe assembly of manifold to traditional flange, bolts must break back plane of flange web (i.e., bolt hole) but must not contact
sensor module housing.

2

WARNING

SuperModule and electronics housing must have equivalent approval labeling in order to maintain hazardous location
approvals.

When upgrading, verify SuperModule and electronics housing certifications are equivalent. Differences in temperature class
ratings may exist, in which case the complete assembly takes the lowest of the individual component temperature classes (for
example, a T4/T5 rated electronics housing assembled to a T4 rated SuperModule is a T4 rated transmitter.)

Severe changes in the electrical loop may inhibit HART® Communication or the ability to reach alarm values. Therefore, Emerson
cannot absolutely warrant or guarantee that the correct failure alarm level (HIGH or LOW) can be read by the host system at the
time of annunciation.

Physical access

Unauthorized personnel may potentially cause significant damage to and/or misconfiguration of end users’ equipment. This could
be intentional or unintentional and needs to be protected against.

Physical security is an important part of any security program and fundamental to protecting your system. Restrict physical access
by unauthorized personnel to protect end users’ assets. This is true for all systems used within the facility.

3

4

Reference Manual Contents

00809-0100-4107 September 2020

Contents

Chapter 1 Introduction.............................................................................................................. 7

1.1 Using this manual........................................................................................................................ 7

1.2 Models covered........................................................................................................................... 7

1.3 HART installation flowchart..........................................................................................................8

1.4 Transmitter overview...................................................................................................................9

1.5 Product recycling/disposal.........................................................................................................10

Chapter 2 Configuration...........................................................................................................11

2.1 Overview................................................................................................................................... 11

2.2 Safety messages........................................................................................................................ 11

2.3 System readiness.......................................................................................................................12

2.4 Configuration basics.................................................................................................................. 13

2.5 Verify configuration...................................................................................................................16

2.6 Basic setup of the transmitter.................................................................................................... 18

2.7 Configuring the LCD display.......................................................................................................24

2.8 Detailed transmitter setup.........................................................................................................25

2.9 Performing transmitter tests......................................................................................................31

2.10 Configuring burst mode...........................................................................................................33

2.11 Establishing multidrop communication................................................................................... 34

Chapter 3 Hardware Installation.............................................................................................. 37

3.1 Overview................................................................................................................................... 37

3.2 Safety messages........................................................................................................................ 37

3.3 Considerations...........................................................................................................................38

3.4 Installation procedures.............................................................................................................. 39

3.5 Rosemount 305, 306, and 304 Manifolds...................................................................................49

3.6 Liquid level measurement..........................................................................................................60

Chapter 4 Electrical Installation................................................................................................65

4.1 Overview................................................................................................................................... 65

4.2 Safety messages........................................................................................................................ 65

4.3 LOI/LCD display .........................................................................................................................66

4.4 Configure security and simulation..............................................................................................67

4.5 Setting transmitter alarm.......................................................................................................... 70

4.6 Electrical considerations............................................................................................................ 70

Chapter 5 Operation and Maintenance.....................................................................................79

5.1 Overview................................................................................................................................... 79

5.2 Safety messages........................................................................................................................ 79

5.3 Recommended calibration tasks................................................................................................80

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5.4 Calibration overview..................................................................................................................81

5.5 Determining calibration frequency............................................................................................ 83

5.6 Compensating for span line pressure effects (range 4 and 5)..................................................... 85

5.7 Trim the pressure signal.............................................................................................................86

5.8 Trim the analog output..............................................................................................................89

5.9 Switching HART revision............................................................................................................ 92

Chapter 6 Troubleshooting...................................................................................................... 95

6.1 Overview................................................................................................................................... 95

6.2 Safety messages........................................................................................................................ 95

6.3 Service support..........................................................................................................................96

6.4 Troubleshooting tables..............................................................................................................97

6.5 Diagnostic messages................................................................................................................. 99

6.6 Disassembly procedures.......................................................................................................... 102

6.7 Reassembly procedures...........................................................................................................104

Chapter 7 Safety Instrumented Systems Requirements.......................................................... 107

7.1 Safety certified identification...................................................................................................107

7.2 Installation in SIS applications..................................................................................................107

7.3 Configuring in SIS applications.................................................................................................108

7.4 SIS operation and maintenance............................................................................................... 109

7.5 Inspection................................................................................................................................110

Appendix A Reference data....................................................................................................... 113

A.1 Product certifications.............................................................................................................. 113

A.2 Ordering information, specifications, and drawings.................................................................113

Appendix B Field Communicator Menu Trees and Fast Keys.......................................................115

B.1 Field Communicator menu trees..............................................................................................115

B.2 Field communicator Fast Keys..................................................................................................119

Appendix C Local Operator Interface (LOI) Menu....................................................................... 121

C.1 LOI menu tree..........................................................................................................................121

C.2 LOI menu tree - extended menu.............................................................................................. 122

C.3 Number entry..........................................................................................................................123

C.4 Text entry................................................................................................................................124

6 Rosemount 2051 Pressure Transmitter

Reference Manual

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Introduction

1 Introduction

1.1 Using this manual

The sections in this manual provides information on configuring, troubleshooting,
operating, and maintaining the Rosemount 2051 Pressure Transmitter specifically with
HART® Revision 5 and 7 Selectable Protocol.

The sections in this manual are organized as follows:

• Configuration provides instruction on configuration of the tranmitter, information on

software functions, configuration parameters, and other variables are also included.

• Hardware Installation contains mechanical installation instructions, and field upgrade

options.

• Electrical Installation contains electrical installation instructions, and field upgrade

options.

• Operation and Maintenance provides detailed information on calibrating and changing

HART® Revisions.

• Troubleshooting provides troubleshooting techniques for the most common operating

problems.

• Safety Instrumented Systems Requirements provides identification, installation,

configuration, operation and maintenance, and inspection information for Safety
Instrumented Systems.

• Reference data supplies links to updated specifications, ordering information, intrinsic

safety approval information, European ATEX directive information, and approval
drawings.

• Field Communicator Menu Trees and Fast Keys provides full menu trees and

abbreviated Fast Key sequences for commisioning tasks.

• Local Operator Interface (LOI) Menu provides detailed LOI menu trees.

1.2 Models covered

The following 2051 Transmitters are covered by this manual:

• Rosemount 2051C Coplanar™ Pressure Transmitter
— Measures differential and gauge pressure up to 2000 psi (137.9 bar).

• Rosemount 2051T In-Line Pressure Transmitter
— Measures gauge/absolute pressure up to 10000 psi (689.5 bar).

• Rosemount 2051L Level Transmitter
— Measures level and specific gravity up to 300 psi (20.7 bar).

• Rosemount 2051CF Series Flowmeter
— Measures flow in line sizes from -in. (15mm) to 96-in. (2400 mm).

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Note

For Rosemount 2051 with FOUNDATION Fieldbus, see Reference Manual. For Rosemount
2051 with PROFIBUS PA Protocol, see Reference Manual.

1.3 HART installation flowchart

Figure 1-1: HART Installation Flowchart

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1.4 Transmitter overview

The Rosemount 2051C Coplanar™ design is offered for Differential Pressure (DP) and
Gauge Pressure (GP) measurements. The Rosemount 2051C utilizes capacitance sensor
technology for DP and GP measurements. The Rosemount 2051T utilizes piezoresistive
sensor technology for AP and GP measurements.

The major components of the transmitter are the sensor module and the electronics
housing. The sensor module contains the oil filled sensor system (isolating diaphragm, oil
fill system, and sensor) and the sensor electronics. The sensor electronics are installed
within the sensor module and include a temperature sensor, a memory module, and the
analog-to-digital signal converter (A/D converter). The electrical signals from the sensor
module are transmitted to the output electronics in the electronics housing. The
electronics housing contains the output electronics board, the optional external
configuration buttons, and the terminal block. The basic block diagram of the transmitter
is illustrated in Figure 1-3.

When pressure is applied to the isolating diaphragm, the oil deflects the sensor which then
changes its capacitance or voltage signal. This signal is then changed to a digital signal by
the Signal Processing. The microprocessor then takes the signals from the Signal
Processing and calculates the correct output of the transmitter. This signal is then sent to
the D/A converter, which converts the signal back to the analog signal, then superimposes
the HART® signal on the 4–20 mA output.

An optional LCD display can be ordered that connects directly to the interface board which
maintains direct access to the signal terminals. The display indicates output and
abbreviated diagnostic messages. A glass display cover is provided. For 4-20 mA HART
output, the LCD display features a two-line display. The first line displays the actual
measured value, the second line of six characters displays the engineering units. The LCD
display can also display diagnostic messages.

Note

LCD display utilizes a 5 × 6 character display and can display output and diagnostic
messages. The LOI display uses an 8 × 6 character display and can display output,
diagnostic messages, and LOI menu screens. The LOI display comes with two buttons
mounted on the front of the display board. See Figure 1-2.

Figure 1-2: LCD/LOI display

LCD display

LOI display

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Figure 1-3: Block Diagram Of Operation

A. Sensor Module

B. Electronics Board
C. 4-20 mA Signal to Control System
D. Field Communicator

1.5 Product recycling/disposal

Recycling of equipment and packaging should be taken into consideration and disposed of
in accordance with local and national legislation/regulations.

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2 Configuration

2.1 Overview

This section contains information on commissioning and tasks that should be performed
on the bench prior to installation, as well as tasks performed after installation as described
in Performing transmitter tests.

Field Communicator, AMS Device Manager, and Local Operator Interface (LOI) instructions
are given to perform configuration functions. For convenience, Field Communicator Fast
Key sequences are labeled “Fast Keys,” and abbreviated LOI menus are provided for each
function below.

Full Field Communicator menu trees and Fast Key sequences are available in Field

Communicator Menu Trees and Fast Keys. LOI menu trees are available in Local Operator
Interface (LOI) Menu.

2.2 Safety messages

Procedures and instructions in this section may require special precautions to ensure the
safety of the personnel performing the operation. Refer to the following safety messages
before performing an operation preceded by this symbol.

WARNING

Explosions

Explosions could result in death or serious injury.

Review the approvals section of this manual for any restrictions associated with a safe
installation.

Before connecting a communicator in an explosive atmosphere, ensure the instruments in
the segment are installed in accordance with intrinsically safe or non-incendive field wiring
practices.

In an explosion-proof/flameproof installation, do not remove the transmitter covers when
power is applied to the unit.

Process leaks

Process leaks may cause harm or result in death.

Install and tighten process connectors before applying pressure.

Electrical shocks

Electrical shock could cause death or serious injury.

Avoid contact with the leads and terminals.High voltage that my be present on leads can
cause electrical shock.

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WARNING

Replacement equipment or spare parts not approved by Emerson for use as spare
parts could reduce the pressure retaining capabilities of the transmitter and may
render the instrument dangerous.

Use only bolts supplied or sold by Emerson as spare parts.

Improper assembly of manifolds

Improper assembly of manifolds to traditional flange can damage the SuperModule
Platform.

For safe assembly of manifold to traditional flange, bolts must break black plane of flange
web (i.e., bolt hole) but must not contact module housing.

Physical access

Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or unintentional and
needs to be protected against.

™

Physical security is an important part of any security program and fundamental to
protecting your system. Restrict physical access by unauthorized personnel to protect end
users’ assets. This is true for all systems used within the facility.

2.3 System readiness

• If using HART®-based control or asset management systems, confirm the HART

capability of such systems prior to commissioning and installation. Not all systems are
capable of communicating with HART revision 7 devices.

• For instructions on how to change the HART revision of your transmitter, see Switching

HART revision.

2.3.1

Confirm correct Device Driver

Procedure

1. Verify the latest Device Driver (DD/DTM™) is loaded on your systems to ensure

proper communications.

2. Reference Emerson.com or FieldCommGroup.org for the latest DD.

3. In the browse by member dropdown menu, select Rosemount business unit of

Emerson.

4. Select desired Product.

a) Within Table 2-1, use the HART Universal Revision and Device Revision

numbers to find the correct Device Driver

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Example

Table 2-1: Rosemount 2051 Device Revisions and Files

Software
release
date

NAMUR
software
revision

August
2012

January
1998

(1) NAMUR Software Revision is located on the hardware tag of the device
(2) HART Software Revision can be read using a HART capable configuration tool.
(3) Device Driver file names use Device and DD Revision, e.g. 10_01. HART Protocol is designed to

enable legacy device driver revisions to continue to communicate with new HART devices. To
access new functionality, the new Device Driver must be downloaded. It is recommended to
download new Device Driver files to ensure full functionality.

(4) HART Revision 5 and 7 Selectable, Safety Certified, LOI, Scaled Variable, Configurable Alarms,

Expanded Engineering Units.

Identify device Find Device Driver Review

HART
software

(1)

revision

1.0.0 01 7 10 Rosemount

N/A 178 5 3 Rosemount

(2)

HART
universal
revision

Device
revision

5 9

(3)

Reference
manual

instructions

Changes to
software

2051

Reference
Manual

2051

Reference
Manual

Review
functionality

(4)

N/A

2.4 Configuration basics

CAUTION

Set all transmitter hardware adjustments during commissioning to avoid exposing the
transmitter electronics to the plant environment after installation.

The transmitter can be configured either before or after installation. Configuring the
transmitter on the bench using either a Field Communicator, AMS Device Manager, or LOI
ensures all transmitter components are in working order prior to installation. Verify that
the security switch is set in the unlock ( ) position in order to proceed with configuration.
See Figure 4-2 for switch location.

2.4.1

Configuring on the bench

To configure on the bench, required equipment includes a power supply, and a Field
Communicator, AMS Device Manager, or an LOI (option M4). Wire equipment as shown in

Figure 2-1. To ensure successful HART® communication, a resistance of at least 250 Ωs

must be present between the transmitter and the power supply, see Power supply for
details. Connect the Field Communicator leads to the terminals labeled “COMM” on the
terminal block or 1–5 V configuration, wire as shown in Figure 2-1. The Field
Communicator is connected to the terminals labeled VOUT/COMM.

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Figure 2-1: Wiring the Transmitter (4–20 mA HART)

A. Vdc supply

B. R L ≥ 250 (necessary for HART communication only)

2.4.2

Configuration tools

Figure 2-2: Wiring the Transmitter (1–5 Vdc Low Power)

A. DC power supply

B. Voltmeter

Configuring with a Field Communicator

There are two interfaces available with the Field Communicator: Traditional and
Dashboard interfaces. All steps using a Field Communicator will be described using
Dashboard interfaces. HART® shows the Device Dashboard interface. As stated in System

readiness, it is critical that the latest DD’s are loaded into the Field Communicator. Visit
Emerson.com or FieldCommGroup.org to download latest DD library.

Field Communicator menu trees and Fast Keys are available in Field Communicator Menu

Trees and Fast Keys.

14 Rosemount 2051 Pressure Transmitter

SAVE

1. Overview

2. Configure

3. Service Tools

2088 FT 45B
Online

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Figure 2-3: Device Dashboard

Configuring with AMS Device Manager

Full configuration capability with AMS Device Manager requires loading the most current
Device Descriptor (DD) for this device. Download the latest DD at Emerson.com or

FieldCommGroup.org.

Note

All steps using AMS Device Manager will be described using version 11.5.

Configuring with a LOI

The LOI requires option code M4 to be ordered. To activate the LOI push either
configuration button. Configuration buttons are located on the LCD display (must remove
housing cover to access), or underneath the top tag of the transmitter. See Table 2-2 for
configuration button functionality and Figure 2-4 for configuration button location. When
using the LOI for configuration, several features require multiple screens for a successful
configuration. Data entered will be saved on a screen-by-screen basis; the LOI will indicate
this by flashing “SAVED” on the LCD display each time.

LOI menu trees are available in Local Operator Interface (LOI) Menu.

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Figure 2-4: LOI Configuration Buttons

A. Internal configuration buttons B. External configuration buttons

Table 2-2: LOI Button Operation

Button

Left No SCROLL

Right Yes ENTER

2.4.3 Setting the loop to manual

Whenever sending or requesting data that would disrupt the loop or change the output of
the transmitter, set the process application loop to manual control. The Field
Communicator, AMS Device Manager, or the LOI will prompt you to set the loop to manual
when necessary. The prompt is only a reminder; acknowledging this prompt does not set
the loop to manual. It is necessary to set the loop to manual control as a separate
operation.

2.5 Verify configuration

It is recommended that various configuration parameters are verified prior to installation
into the process. The various parameters are detailed out for each configuration tool.
Depending on what configuration tool(s) are available follow the steps listed relevant to
each tool.

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2.5.1 Verifying configuration with Field Communicator

Configuration parameters listed in Table 2-3 are to be reviewed prior to transmitter
installation. A Full list of configuration parameters that can be reviewed and configured
using a Field Communicator are located in Field Communicator Menu Trees and Fast Keys.

Fast key sequences for the latest DD are shown in Table 2-3. For Fast Key sequences for
legacy DD's contact your local Emerson Representative.

Table 2-3: Device Dashboard Fast Key sequence

From the HOME screen, enter the Fast Key sequences listed

Function Fast Key sequence

HART 7 HART 5

Alarm and Saturation Levels 2, 2, 2, 5 2, 2, 2, 5

Damping 2, 2, 1, 1, 5 2, 2, 1, 1, 5

Primary Variable 2, 1, 1, 4, 1 2, 1, 1, 4, 1

Range Values 2, 1, 1, 4 2, 1, 1, 4

Tag 2, 2, 7, 1, 1 2, 2, 7, 1, 1

Transfer Function 2, 2, 1, 1, 6 2, 2, 1, 1, 6

Units 2, 2, 1, 1, 4 2, 2, 1, 1, 4

2.5.2 Verifying configuration with AMS Device Manager

Right select on the device and select Configuration Properties from the menu. Navigate
the tabs to review the transmitter configuration data.

2.5.3

Verifying configuration with LOI

Press any configuration button to activate the LOI. Select VIEW CONFIG to review the
below parameters. Use the configuration buttons to navigate through the menu. The
parameters to be reviewed prior to installation include:

• Tag

• Units

• Transfer function

• Alarm and saturation levels

• Primary variable

• Range values

• Damping

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2.5.4 Verifying process variables configuration

This section describes how to verify that the correct process variables are selected.

Verifying process variables with a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys 3, 2, 1

Verifying process variables with AMS Device Manager

Procedure

1. Right click the device and select Overview from the menu.

2. Select the All Variables button to display the primary, secondary, tertiary and

quaternary variables.

2.6 Basic setup of the transmitter

This section goes through the necessary steps for basic setup of a pressure transmitter.
When installing in DP level or DP flow applications, refer to Configuring scaled variable for
setup instructions.

2.6.1

Setting pressure units

The pressure unit command sets the unit of measure for the reported pressure.

Setting pressure units with a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

Setting pressure units with AMS Device Manager

Procedure

1. Right select the device and select Configure.

2. Select Manual Setup and select desired units from Pressure Units dropdown menu.

3. Select Send when complete.

2, 2, 1, 1, 4

Setting pressure units with a LOI

Follow Figure 2-5 to select desired pressure and temperature units. Use the SCROLL and
ENTER buttons to select desired unit. Save by selecting SAVE as indicated on the LCD
display screen.

18 Rosemount 2051 Pressure Transmitter

UNITS

PRESS UNITS

TEMP UNITS
BACK TO MENU
EXIT MENU

PRESS UNITS

INH2O
MMHG
CMHG0C
MHG0C
PSI
PSF
ATM
TORR
PA
KPA
...

VIEW CONFIG
ZERO TRIM

UNITS

RERANGE
LOOP TEST
DISPLAY
EXTENDED MENU
EXIT MENU

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Figure 2-5: Selecting Units with LOI

2.6.2 Setting transmitter output (transfer function)

The transmitter has two output settings: Linear and square root. As shown in Figure 2-7,
activating the square root options makes analog output proportional to flow, and includes
a fixed low flow cutoff at five percent.

However, for DP Flow and DP Level applications it is recommended to use scaled variable.
Refer to Configuring scaled variable for setup instructions.

Setting transmitter output with a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

2, 2, 1, 1, 6

Setting transmitter output with AMS Device Manager

Procedure

1. Right click on the device and select Configure.

2. Select Manual Setup and choose output type from analog output transfer function

and select Send.

3. Carefully read the warning and select Yes if it is safe to apply the changes.

Setting transmitter output with a LOI

Reference Figure 2-6 to select either linear or square root transfer function using the LOI.

Reference Manual 19

EXTENDED MENU

CALIBRAT
DAMPING

TRANSFER FUNCT

SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT
VALUES
PASSWORD
SIMLATE
HART REV
BACK TO MENU
EXIT MENU

TRANSFER FUNCT

LINEAR TRANSFER
FUNCTION
SQR ROOT TRANSFER
FUNCTION
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

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Figure 2-6: Set Output with LOI

Figure 2-7: 4–20 mA HART Square Root Output Transition Point

A. Square root curve

B. Five percent transition point

C. Four percent transition point

2.6.3

Rerange the transmitter

The range values command sets each of the lower and upper range analog values (4 and
20 mA/1–5 Vdc points) to a pressure. The lower range point represents 0 percent of range
and the upper range point represents 100 percent of range. In practice, the transmitter
range values may be changed as often as necessary to reflect changing process
requirements.

Select from one of the methods below to rerange the transmitter. Each method is unique;

20 Rosemount 2051 Pressure Transmitter

examine all options closely before deciding which method works best for your process.

• Rerange by manually setting range points with a Field Communicator, AMS Device

Manager, or LOI.

RERANGE

ENTER VALUES

APPLY VALUES
BACK TO MENU
EXIT MENU

ENTER VALUES

LRV
URV
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS

RERANGE

LOOP TEST
DISPLAY
EXTENDED MENU
EXIT MENU

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• Rerange with a pressure input source and a Field Communicator, AMS Device Manager,

LOI, or local zero and span buttons.

Manually rerange the transmitter by entering range points

Entering range points with a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys 2, 2, 2, 1

Entering range points with AMS Device Manager

Procedure

1. Right select the device and select Configure.

2. Select Manual Setup and select Analog Output.

3. Enter upper and lower range values in the Range Limits box and click Send.

4. Carefully read the warning and click Yes if it is safe to apply the changes.

Entering range points with a LOI

Reference Figure 2-8 to rerange the transmitter using the LOI. Enter values using SCROLL
and ENTER buttons.

Figure 2-8: Rerange with LOI

Rerange the transmitter with applied pressure source

Reranging using an applied pressure source is a way of reranging the transmitter without
entering specific 4 and 20 mA (1–5 Vdc) points.

Rerange with an applied pressure source using a Field Communicator

From the HOME screen, enter the Fast Key sequence

Device Dashboard Fast Keys

Rerange with an applied pressure source using AMS Device Manager

2, 2, 2, 2

Reference Manual 21

Procedure

1. Right select the device, select Configure.

2. Select the Analog Output tab.

3. Select Range by Applying Pressure button and follow the screen prompts range the

transmitter.

RERANGE

ENTER VALUES

APPLY VALUES

BACK TO MENU
EXIT MENU

APPLY VALUES

LRV
URV
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS

RERANGE

LOOP TEST
DISPLAY
EXTENDED MENU
EXIT MENU

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Rerange with an applied pressure source using a Field Communicator

Use Figure 2-9 to manually rerange the device using an applied pressure source with
an LOI.

Figure 2-9: Rerange with Applied Pressure Using LOI

Rerange with an applied pressure source using local zero and span buttons

If ordered, local zero and span buttons (option code D4) can be used to rerange the
transmitter with an applied pressure. Refer to Figure 2-10 for analog zero and span button
location.

To rerange the transmitter using the span and zero buttons, perform the following
procedure:

Procedure

1. Loosen the screw holding the top tag of the transmitter housing. Rotate the label to

expose the zero and span buttons.

2. Confirm device has local zero and span buttons by verifying blue retainer under the

tag.

3. Apply transmitter pressure.

4. Rerange the transmitter.

a) To change the zero (4 mA/1 V point) while maintaining the span: press and

hold zero button for at least two seconds then release.

b) To change the span (20 mA/5 V point) while maintaining the zero point:

press and hold the span button for at least two seconds and then release.

Example

Note

4 mA and 20 mA points must maintain the minimum span.

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Figure 2-10: Analog Zero and Span Buttons

A. Zero and span buttons

Note

• If the transmitter security is on, adjustments to the zero and span will not be able to be

made. Refer to Configure security and simulation for security information.

2.6.4

• The span is maintained when the 4 mA/1 V point is set. The span changes when the 20

mA 5 V point is set. If the lower range point is set to a value that causes the upper range
point to exceed the sensor limit, the upper range point is automatically set to the
sensor limit, and the span is adjusted accordingly.

• Regardless of the range points, the transmitter measure and report all readings within

the digital limits of the sensor. For example, if the 4 and 20 mA(1–5 Vdc) points are set
to 0 and 10 inH2O, and the transmitter detects a pressure of 25 inH2O, it digitally
outputs the 25 inH2O reading and a 250 percent of range reading.

Damping

The damping command changes the response time of the transmitter; higher values can
smooth variations in output readings caused by rapid input changes. Determine the
appropriate damping setting based on the necessary response time, signal stability, and
other requirements of the loop dynamics within your system. The damping command
utilizes floating point configuration allowing the user to input any damping value within

0.0–60.0 seconds.

Damping with a Field Communicator

Procedure

1. From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

2. Enter desired Damping Value and select APPLY.

Reference Manual 23

2, 2, 1, 1, 5

EXTENDED MENU

CALIBRAT

DAMPING

TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT VALUES
PASSWORD
SIMLATE
HART REV
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

Configuration Reference Manual

September 2020 00809-0100-4107

Damping with AMS Device Manager

Procedure

1. Right select the device and select Configure.

2. Select Manual Setup.

3. Within the Pressure Setup box, enter desired damping value and click Send.

4. Carefully read the warning and click Yes if it is safe to apply the changes.

Damping with a LOI

Reference Figure 2-11 to enter damping values using an LOI.

Figure 2-11: Damping with LOI

2.7 Configuring the LCD display

2.7.1

24 Rosemount 2051 Pressure Transmitter

The LCD display configuration command allows customization of the LCD display to suit
application requirements. The LCD display will alternate between the selected items.

• Pressure Units

• % of Range

• Scaled Variable

• Sensor Temperature

• mA/Vdc Output

In the following instructions, the LCD display can also be configured to display
configuration information during the device startup. Select Review Parameters at Startup
to enable or disable this functionality.

Reference Configuring the LCD display with LOI for image of LCD display screen.

Configuring LCD display with a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

2, 2, 4

DISPLAY

PRESS (on/off)
SCALED (on/off)
TEMP (on/off)
%RANGE (on/off)
ANALOG (on/off)
STRTUP (on/off)
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST

DISPLAY

EXTENDED MENU
EXIT MENU

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00809-0100-4107 September 2020

2.7.2 Configuring LCD display with AMS Device Manager

Procedure

1. Right select on the device and select Configure.

2. Select Manual Setup, select the Display tab.

3. Select desired display options and click Send.

2.7.3 Configuring LCD display with a LOI

Refer to Figure 2-12 for LCD display configuration using a LOI.

Figure 2-12: Display with LOI

2.8 Detailed transmitter setup

2.8.1 Configuring alarm and saturation levels

Reference Manual 25

In normal operation, the transmitter will drive the output in response to pressure from the
lower to upper saturation points. If the pressure goes outside the sensor limits, or if the
output would be beyond the saturation points, the output will be limited to the associated
saturation point.

The transmitter automatically and continuously performs self-diagnostic routines. If the
self-diagnostic routines detect a failure, the transmitter drives the output to configured
alarm and value based on the position of the alarm switch. See Setting transmitter alarm.

Table 2-4: Rosemount Alarm and Saturation Values

Level 4–20 mA (1–5 Vdc) saturation 4–20 mA (1–5 Vdc alarm

Low 3.90 mA (0.97 V) ≤ 3.75 mA (0.95 V)

High 20.80 mA (5.20 V) ≥ 21.75 mA (5.40 V)

Table 2-5: NAMUR-Compliant Alarm and Saturation Values

Level 4–20 mA (1–5 Vdc) saturation 4–20 mA (1–5 Vdc) alarm

Low 3.80 mA (0.95 V) ≤ 3.60 mA (0.90 V) (.90 –.95 V)

High 20.50 mA (5.13 V) ≥22.50 mA (5.63 V) (5.05 –5.75 V)

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September 2020 00809-0100-4107

Table 2-6: Custom Alarm and Saturation Values

Level 4–20 mA (1–5 Vdc) saturation 4–20 mA (1–5 Vdc) alarm

Low 3.70 mA– 3.90 mA (.90 –.95 V) 3.60–3.80 mA (.90 –.95 V)

High 20.10 mA –22.90 mA (5.025 –5.725 V) 20.20 mA – 23.00 mA (5.05 –5.75 V)

Failure mode alarm and saturation levels can be configured using a Field Communicator,
AMS Device Manager, and the LOI. The following limitations exist for custom levels:

• Low alarm level must be less than the low saturation level

• High alarm level must be higher than the high saturation level

• Alarm and saturation levels must be separated by at least 0.1 mA (0.025 Vdc)

The configuration tool will provide an error message if the configuration rule is violated.

Note

Transmitters set to HART® multidrop mode send all saturation and alarm information
digitally; saturation and alarm conditions will not affect the analog output. See also

Establishing multidrop communication.

Configuring alarm and saturation levels using a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

2, 2, 2, 5

Configuring alarm and saturation levels with AMS Device Manager

Procedure

1. Right select on the device, and select Configure.

2. Select Configure Alarm and Saturation Levels button.

3. Follow screen prompts to configure Alarm and Saturation Levels.

Configuring alarm and saturation levels using LOI

Refer to Figure 2-13 for instructions to configure alarm and saturation levels.

26 Rosemount 2051 Pressure Transmitter

EXTENDED MENU

CALIBRAT
DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG

ALARM SAT VALUES

PASSWORD
SIMULATE
HART REV
BACK TO MENU
EXIT MENU

ALARM SAT VALUES

ROSEMOUNT VALUES
NAMUR VALUES
OTHER VALUES
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

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00809-0100-4107 September 2020

Figure 2-13: Configuring Alarm and Saturation with LOI

2.8.2 Configuring scaled variable

The Scaled Variable configuration allows the user to create a relationship/conversion
between the pressure units and user-defined/custom units. There are two use cases for
Scaled Variable. The first use case is to allow custom units to be displayed on the
transmitter's LCD/LOI display. The second use case is to allow custom units to drive the
transmitter's 4–20 mA (1–5 Vdc) output.

If the user desires custom units to drive the 4–20 mA (1–5 Vdc) output, Scaled Variable
must be re-mapped as the primary variable. Refer to Re-mapping device variables.

The Scaled Variable configuration defines the following items:

• Scaled Variable units - custom units to be displayed.

• Scaled data options - defines the transfer function for the application (linear and square

root)

• Pressure value position 1 - lower known value point with consideration of linear offset.

• Scaled Variable value position 1 - custom unit equivalent to the lower known value

point.

• Pressure value position 2 - upper known value point

• Scaled Variable value position 2 - custom unit equivalent to the upper known value

point

• Linear offset - the value required to zero out pressures effecting the desired pressure

reading.

• Low flow cutoff - point at which output is driven to zero to prevent problems caused by

process noise. It is highly recommended to use the low flow cutoff function in order to
have a stable output and avoid problems due to process noise at a low flow or no flow
condition. A low flow cutoff value that is practical for the flow element in the
application should be entered.

Reference Manual 27

Configuring scaled variable using a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

2, 1, 4, 7

EXTENDED MENU

CALIBRAT
DAMPING
TRANSFER FUNCT

SCALED VARIAB

ASSIGN PV
TAG
ALARM SAT VALUES
PASSWORD
SIMLATE
HART REV
BACK TO MENU
EXIT MENU

SCALED VARIAB

VIEW SCALED

CONFIG SCALED

BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

Configuration Reference Manual

September 2020 00809-0100-4107

Procedure

Follow the screen prompts to configure Scaled Variable.

a) When configuring for level, select Linear under Select Scaled data options.

b) When configuring for flow, select Square Root under Select Scaled data options.

Configuring scaled variable using AMS Device Manager

Procedure

1. Right select on the device and, select Configure.

2. Select the Scaled Variable tab and select the Scaled Variable button.

3. Follow screen prompts to configure Scaled Variable

a) When configuring for level applications, select Linear under Select Scaled

data options.

b) When configuring for flow applications, select Square Root under Select

Scaled data options.

Configuring scaled variable using a LOI

Refer to Figure 2-14 for instructions to configure Scaled Variable using a LOI.

Figure 2-14: Configuring Scaled Variable Using a LOI

28 Rosemount 2051 Pressure Transmitter

H

L

230-in.

200-in.

12-in.

0.94 sg

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00809-0100-4107 September 2020

DP level example

Figure 2-15: Example Tank

A differential transmitter is used in a level application. Once installed on an empty tank
and taps vented, the process variable reading is –209.4 inH2O. The process variable
reading is the head pressure created by fill fluid in the capillary. Based on Table 2-7, the
scaled variable configuration would be as follows:

Table 2-7: Scaled Variable Configuration for Tank Application

Scaled variable units: inch

Scaled data 13: linear

Pressure value position 1: 0 inH2O

Scaled Variable position 1: 12-in.

Pressure value position 2: 188 inH2O

Scaled Variable position 2: 212-in.

Linear offset: –209.4 inH2O

DP flow example

A differential pressure transmitter is used in conjunction with an orifice plate in a flow
application where the differential pressure at full scale flow is 125 inH2O. In this particular
application, the flow rate at full scale flow is 20,000 gallons of water per hour. It is highly
recommended to use the low flow cutoff function in order to have a stable output and
avoid problems due to process noise at a low flow or no flow condition. A low flow cutoff
value that is practical for the flow element in the application should be entered. In this

Reference Manual 29

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September 2020 00809-0100-4107

particular example, the low flow cutoff value is 1000 gallons of water per hour. Based on
this information, the Scaled Variable configuration would be as follows:

Table 2-8: Scaled Variable Configuration for Flow Application

Scaled Variable units: gal/h

Scaled data options: square root

Pressure value position 2: 125 inH2O

Scaled Variable position 2: 20,000 gal/h

Low Flow Cutoff: 1000 gal/h

Note

Pressure value position 1 and Scaled Variable position 1 are always set to zero for a flow
application. No configuration of these values is required.

2.8.3

Re-mapping device variables

The re-mapping function allows the transmitter primary, secondary, tertiary, and
quaternary variables (PV, 2V, 3V, and 4V) to be configured as desired. The PV can be
remapped with a Field Communicator, AMS Device Manager, or a LOI. Variables (2V, 3V,
and 4V) can only be re-mapped via Field Communicator or AMS Device Manager.

Note

The variable assigned to the primary variable drives the 4–20 mA (1–5 Vdc) output. This
value can be selected as Pressure or Scaled Variable. The 2, 3, and 4 variables only apply if
HART® burst mode is being used.

Re-mapping using a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Fast Keys

Re-mapping using AMS Device Manager

Procedure

1. Right select the device and select Configure.

2. Select Manual Setup and click on the HART tab.

3. Assign Primary, secondary, tertiary, and quaternary variables under Variable

Mapping.

4. Select Send.

5. Carefully read the warning and select Yes if it is safe to apply the changes.

2, 1, 1, 3

Re-mapping using LOI

Refer to Figure 2-16 for instructions to remap the primary variable using a LOI.

30 Rosemount 2051 Pressure Transmitter

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

EXTENDED MEN U

CALIBRAT
DAMPING
TRANSFER FUNCT
SCALED VARIAB

ASSIGN PV

TAG
ALARM SAT VALUES
PASSWORD
SIMULATE
HART REV
BACK TO

MENU

EXIT MENU

Reference Manual Configuration

00809-0100-4107 September 2020

Figure 2-16: Re-mapping with LOI

2.9 Performing transmitter tests

2.9.1 Verifying alarm level

2.9.2

If the transmitter is repaired or replaced, verify the transmitter alarm level before
returning the transmitter to service. This is useful in testing the reaction of the control
system to a transmitter in an alarm state. Thus ensuring the control system recognizes the
alarm when activated. To verify the transmitter alarm values, perform a loop test and set
the transmitter output to the alarm value see Configuring alarm and saturation levels.

Note

Before returning transmitter to service, verify security switch is set to the correct position.
Refer to Verify configuration.

Performing an analog loop test

The analog loop test command verifies the output of the transmitter, the integrity of the
loop, and the operations of any recorders or similar devices installed in the loop. It is
recommended that the 4–20 mA (1–5 Vdc) points in addition to alarm levels when
installing, repairing, or replacing a transmitter.

The host system may provide a current measurement for the 4–20 mA (1–5 Vdc) HART
output. If not, connect a reference meter to the transmitter by either connecting the
meter to the test terminals on the terminal block, or shunting transmitter power through
the meter at some point in the loop. For 1–5 V output, voltage measurement is directly
measured from Vout to (–) terminals.

Performing an analog loop test using a Field Communicator

®

Reference Manual 31

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

3, 5, 1

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September 2020 00809-0100-4107

Performing an analog loop test using AMS Device Manager

Procedure

1. Right select on the device and, within the Methods drop down menu, move cursor

over Diagnostics and Test. In the Diagnostics and Test drop down menu select Loop
Test.

2. Select Next after setting the control loop to manual.

3. Follow Screen prompts to perform a Loop Test.

4. Select Finish to acknowledge the method is complete.

Performing analog loop test using a LOI

To perform an analog loop test using the LOI, the 4 mA (1 V), 20 mA (5 V), and custom mA
point may be set manually. Reference Figure 2-17 for instructions on how to perform a
transmitter loop test using an LOI.

Figure 2-17: Performing an Analog Loop Test Using an LOI

2.9.3

Simulate device variables

It is possible to temporarily set the Pressure, Sensor Temperature, or Scaled Variable to a
user-defined fixed value for testing purposes. Once the simulated variable method is left,
the process variable will be automatically returned to a live measurement. Simulate device
variables is only available in HART® Revision 7 mode.

Simulate digital signal with a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

3, 5

Simulate digital signal with AMS Device Manager

Procedure

1. Right select on the device and select Service Tools.

2. Select Simulate.

3. Under Device Variables select a digital value to simulate.

a) Pressure

32 Rosemount 2051 Pressure Transmitter

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00809-0100-4107 September 2020

b) Sensor Temperature

c) Scaled Variable

4. Follow the screen prompts to simulate selected digital value.

2.10 Configuring burst mode

Burst mode is compatible with the analog signal. Because the HART® protocol features
simultaneous digital and analog data transmission, the analog value can drive other
equipment in the loop while the control system is receiving the digital information. Burst
mode applies only to the transmission of dynamic data (pressure and temperature in
engineering units, pressure in percent of range, Scaled Variable, and/or analog output),
and does not affect the way other transmitter data is accessed. However, when activated,
bust mode can slow down communication of non-dynamic data to the host by 50 percent.

Access to information other than dynamic transmitter data is obtained through the
normal poll/response method of HART communication. A Field Communicator, AMS
Device Manager, or the control system may request any of the information that is
normally available while the transmitter is in burst mode. Between each message sent by
the transmitter, a short pause allows the Field Communicator, AMS Device Manager, or a
control system to initiate a request.

2.10.1

2.10.2

Choosing burst mode options in HART® 5

Message content options:

• PV only

• Percent of Range

• PV, 2V, 3V, 4V

• Process Variables

• Device Status

Choosing burst mode options in HART® 7

Message content options:

• PV only

• Percent of Range

• PV, 2V, 3V, 4V

• Process Variables and Status

• Process Variables

• Device Status

2.10.3

Reference Manual 33

Choosing a HART® 7 trigger mode

When in HART 7 mode, the following trigger modes can be selected.

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September 2020 00809-0100-4107

• Continuous (same as HART5 burst mode)

• Rising

• Falling

• Windowed

• On Change

Note

Consult your host system manufacturer for burst mode requirements.

2.10.4 Configuring burst mode using a Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

2, 2, 5, 3

2.10.5 Configuring burst mode using AMS Device Manager

Procedure

1. Right select on the device and select Configure.

2. Select the HART tab.

3. Enter the configuration in Burst Mode Configuration fields.

2.11 Establishing multidrop communication

Multidropping transmitters refers to the connection of several transmitters to a single
communications transmission line. Communication between the host and the
transmitters takes place digitally with the analog output of the transmitters deactivated.

Multidrop installation requires consideration of the update rate necessary from each
transmitter, the combination of transmitter models, and the length of the transmission
line. Communication with transmitters can be accomplished with HART® modems and a
host implementing HART protocol. Each transmitter is identified by a unique address and
responds to the commands defined in the HART protocol. Field Communicators and AMS
Device Manager can test, configure, and format a multidropped transmitter the same way
as a transmitter in a standard point-to-point installation.

Figure 2-18 shows a typical multidrop network. This figure is not intended as an

installation diagram.

34 Rosemount 2051 Pressure Transmitter

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Figure 2-18: Typical Multidrop Network (4–20 mA only)

A. HART modem

B. Power supply

The product is set to address zero (0) at the factory, which allows operation in the
standard point-to-point manner with a 4–20 mA (1–5 Vdc) output signal. To activate
multidrop communication, the transmitter address must be changed to a number from 1
to 15 for HART Revision 5, or 1–63 for HART Revision 7. This change deactivates the 4–
20 mA (1–5 Vdc) analog output, sending it to 4 mA (1 Vdc). It also disables the failure
mode alarm signal, which is controlled by the upscale/downscale switch position. Failure
signals in multidropped transmitters are communicated through HART messages.

2.11.1

Changing a transmitter address

To activate multidrop communication, the transmitter poll address must be assigned a
number from 1 to 15 for HART® Revision 5, and 1–63 for HART Revision 7. Each
transmitter in a multidropped loop must have a unique poll address.

Changing transmitter address using a Field Communicator

From the HOME screen, enter the Fast Key sequence.

HART Revision 5

Device Dashboard Fast Keys 2, 2, 5, 2, 1 2, 2, 5, 2, 2

Changing transmitter address using AMS Device Manager

Procedure

1. Right select on the device and select Configure.

2. In HART Revision 5 mode:

a) Select Manual Setup, select the HART tab.

b) In the Communication Settings box enter polling address in the Polling

Address box, select Send.

3. In HART Revision 7 mode:

HART Revision 7

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September 2020 00809-0100-4107

a) Select Manual Setup, select the HART tab and select the Change Polling

Address button.

4. Carefully read the warning and click Yes if it is safe to apply the changes.

2.11.2 Communicating with a multidropped transmitter

To communicate with a multidrop transmitter, the Field Communicator or AMS Device
Manager has to be set up for Polling.

Communicating with a multidropped transmitter using a Field Communicator

Procedure

1. Select Utility and Configure HART Application.

2. Select Polling Addresses.

3. Enter 0–63.

Communicating with a multidropped transmitter using AMS Device Manager

Procedure

Select on the HART® modem icon and select Scan All Devices.

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3 Hardware Installation

3.1 Overview

The information in this section covers installation considerations for the Rosemount 2051
with HART® protocols. A Quick Installation Guide is shipped with every transmitter to
describe recommended pipe-fitting and wiring procedures for initial installation.
Dimensional drawings for each transmitter variation and mounting configuration are
included on Bolt installation.

Note

For transmitter disassembly and reassembly refer to Disassembly procedures, and

Reassembly procedures.

3.2 Safety messages

Procedures and instructions in this section may require special precautions to ensure the
safety of the personnel performing the operation. Refer to the following safety messages
before performing an operation preceded by this symbol.

WARNING

Explosions

Explosions could result in death or serious injury.

Review the approvals section of this manual for any restrictions associated with a safe
installation.

Before connecting a communicator in an explosive atmosphere, ensure the instruments in
the segment are installed in accordance with intrinsically safe or non-incendive field wiring
practices.

In an explosion-proof/flameproof installation, do not remove the transmitter covers when
power is applied to the unit.

Process leaks

Process leaks may cause harm or result in death.

Install and tighten process connectors before applying pressure.

Electrical shocks

Electrical shock could cause death or serious injury.

Avoid contact with the leads and terminals.High voltage that my be present on leads can
cause electrical shock.

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WARNING

Replacement equipment or spare parts not approved by Emerson for use as spare
parts could reduce the pressure retaining capabilities of the transmitter and may
render the instrument dangerous.

Use only bolts supplied or sold by Emerson as spare parts.

Improper assembly of manifolds

Improper assembly of manifolds to traditional flange can damage the SuperModule
Platform.

For safe assembly of manifold to traditional flange, bolts must break black plane of flange
web (i.e., bolt hole) but must not contact module housing.

Physical access

Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or unintentional and
needs to be protected against.

™

Physical security is an important part of any security program and fundamental to
protecting your system. Restrict physical access by unauthorized personnel to protect end
users’ assets. This is true for all systems used within the facility.

3.3 Considerations

3.3.1 Installation considerations

Measurement accuracy depends upon proper installation of the transmitter and impulse
piping. Mount the transmitter close to the process and use a minimum of piping to
achieve best accuracy. Keep in mind the need for easy access, personnel safety, practical
field calibration, and a suitable transmitter environment. Install the transmitter to
minimize vibration, shock, and temperature fluctuation.

Important

Install the enclosed pipe plug (found in the box) in unused conduit opening. Engage a
minimum of five threads to comply with explosion-proof requirements. For tapered
threads, install the plug wrench tight. For material compatibility considerations, see
Material Selection Technical Note on Emerson.com/Rosemount.

3.3.2

Environmental considerations

Best practice is to mount the transmitter in an environment that has minimal ambient
temperature change. The transmitter electronics temperature operating limits are –40 to
185 °F (–40 to 85 °C). Mount the transmitter so that it is not susceptible to vibration and
mechanical shock and does not have external contact with corrosive materials.

38 Rosemount 2051 Pressure Transmitter

A

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3.3.3 Mechanical considerations

Steam service

For steam service or for applications with process temperatures greater than the limits of
the transmitter, do not blow down impulse piping through the transmitter. Flush lines
with the blocking valves closed and refill lines with water before resuming measurement.

Side mounted

When the transmitter is mounted on its side, position the coplanar flange to ensure proper
venting or draining. Mount the flange as shown in Mounting requirements, keeping drain/
vent connections on the bottom for gas service and on the top for liquid service.

3.4 Installation procedures

3.4.1 Mount the transmitter

Process flange orientation

Mount the process flanges with sufficient clearance for process connections. For safety
reasons, place the drain/vent valves so the process fluid is directed away from possible
human contact when the vents are used. In addition, consider the need for a testing or
calibration input.

Note

Most transmitters are calibrated in the horizontal position. Mounting the transmitter in
any other position will shift the zero point to the equivalent amount of liquid head
pressure caused by the varied mounting position. To reset zero point, refer to Trim the

pressure signal.

Housing rotation

To improve field access to wiring or to better view the optional LCD display follow the
procedure steps.

Figure 3-1: Housing Rotation

A. Housing rotation set screw (5/64 in.)

Procedure

1. Loosen the housing rotation set screw using a 5/64 -in. hex wrench.

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2. Rotate the housing clockwise to the desired location.

3. If the desired location cannot be achieved due to thread limit, rotate the housing

counterclockwise to the desired location (up to 360° from thread limit).

4. Retighten the housing rotation set screw to no more than 7 in-lbs when desired

location is reached.

Electronics housing clearance

Mount the transmitter so the terminal side is accessible. Clearance of 0.75 in. (19 mm) is
required for cover removal. Use a conduit plug in the unused conduit opening. Three
inches of clearance is required for cover removal if a meter is installed.

Environmental seal for housing

For NEMA 4X, IP66, and IP68 requirements, use thread seal (PTFE) tape or paste on male
threads of conduit to provide a watertight seal.

Always ensure a proper seal by installing the electronics housing cover(s) so that metal
contacts metal. Use Rosemount O-rings.

Flange bolts

The Rosemount 2051 can be shipped with a coplanar flange or a traditional flange
installed with four 1.75-inch flange bolts. Mounting bolts and bolting configurations for
the coplanar and traditional flanges can be found on Bolt installation. Stainless steel bolts
supplied by Emerson are coated with a lubricant to ease installation. Carbon steel bolts do
not require lubrication. No additional lubricant should be applied when installing either
type of bolt. Bolts supplied by Emerson are identified by their head markings.

Bolt installation

Only use bolts supplied with the transmitter or sold by Emerson as spare parts. The use of
non approved bolts could reduce pressure. Use the following bolt installation procedure:

Table 3-1: Bolt installation torque values

Bolt material Initial torque value Final torque value

CS-(ASTM-A445) Standard 300 in.-lb (34 N-m) 650 in.-lb (73 N-m)

Austemitic 316 SST—Option L4 150 in.-lb (17 N-m) 300 in.-lb (34 N-m)

ASTM A193 Grade B7M—Option L5 300 in.-lb (34 N-m) 650 in.-lb (73 N-m)

ASTM A 193 Class 2, Grade B8M optionL8300 in.-lb (34 N-m) 650 in.-lb (73 N-m)

40 Rosemount 2051 Pressure Transmitter

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Figure 3-2: Traditional Flange Bolt Configurations

A. Differential transmitter

B. Gauge/Absolute transmitter

C. Drain/vent

D. Plug

E. 1.75 (44) × 4

F. 1.50 (38) × 4

(1)

Note: Dimensions are in inches (millimeters)

Figure 3-3: Mounting Bolts and Bolt Configurations for Coplanar Flange

A. Transmitter with flange bolts

B. Transmitter with flange adapters and flange/adapter bolts

C. 1.75 (44) × 4

D. 2.88 (73) × 4

Dimensions are in inches (millimeters).

For Gauge and Absolute Transmitters: 150 (38) x 2

(1)

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Table 3-2: Bolt configurations values

Description Quantity Size in. (mm)

Differential pressure

Flange bolts 4 1.75 (44)

Flange/adapter bolts 4 2.88 (73)

Gauge/Absolute pressure

Flange bolts 4 1.75 (44)

Flange/adapter bolts 2 2.88 (73)

(1) Rosemount 2051T Transmitters are direct mount and do not require bolts for process

connection.

(1)

Figure 3-4: Mounting Bracket Option Codes B1, B7, and BA

A. 3.75 (95)

B. 1.63 (41)

C. 4.09 (104)

D. 2.73 (69)

E. 4.97 (126)

F. 2.81 (71)

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Figure 3-5: Panel Mounting Bracket Option Codes B2 and B8

A. 3.75 (95)
B. 1.63 (41)
C. 4.09 (104)

D. 2.81 (71)

E. 4.5 (114)

A. 1.40 (36)
B. Mounting holes 0.375 diameter (10)
C. 1.405 (35,7)

D. 1.405 (35,7)

Figure 3-6: Flat Mounting Bracket Option Codes B3 and BC

A. 1.625 (41)

B. 2.125 (54)

C. 2.81 (71)

D. 8.00 (203)

Note: Dimensions are in inches (millimeters).

Procedure

1. Finger-tighten the bolts.

2. Torque the bolts to the initial torque value using a crossing pattern (see Table 3.4.2

for torque values).

3. Torque the bolts to the final torque value using the same crossing pattern.

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Mounting brackets

Rosemount 2051 transmitters may be panel-mounted or pipe-mounted via an optional
mounting bracket. Refer to Table 3-2 for the complete offering and see Figure 3-7 through

Figure 3-6 on pages Figure 3-7 and 39 for dimensional and mounting configuration

information.

Table 3-3: Mounting brackets

Option
code

B4 X X X X X X X

B1 X X X X

B2 X X X X

B3 X X X X

B7 X X X X

B8 X X X X

B9 X X X X

BA X X X X

BC X X X X

Process connections Mounting Materials

Coplanar In-line Traditional Pipe

mount

Panel
mount

Flat
panel
mount

CS
bracket

SST
bracket

CS bolts SST

bolts

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Figure 3-7: Mounting Bracket Option Code B4

A. 5/16 x 1

½ Bolts for panel mounting(not supplied)

B. 3.4 (85)

C. 3/8-16 x 1¼ Bolts for mounting to transmitter

D. 2.8 (71)

E. 3.85 (98)

F. 5.16 (131)
G. 1.99 (51)
H. 4.72 (120)

I. 6.90 (175)

Note: Dimensions are in inches (millimeters).

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1. Carbon steel (CS) head markings

2. Stainless steel (SST) head markings

3. Alloy K-500 head marking

3.4.2

Note

The last digit in the F593_head marking may be any letter between A and M.

Impulse piping

Mounting requirements

Impulse piping configurations depend on specific measurement conditions. Refer to

Figure 3-8 for examples of the following mounting configurations:

Liquid flow measurement

• Place taps to the side of the line to prevent sediment deposits on the process isolators.

• Mount the transmitter beside or below the taps so gases vent into the process line.

• Mount drain/vent valve upward to allow gases to vent.

Gas flow measurement

• Place taps in the top or side of the line.

• Mount the transmitter beside or above the taps so to drain liquid into the process line.

Steam flow measurement

• Place taps to the side of the line.

• Mount the transmitter below the taps to ensure that impulse piping will remain filled

with condensate.

• In steam service above 250 °F (121 °C), fill impulse lines with water to prevent steam

from contacting the transmitter directly and to ensure accurate measurement startup.

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Note

For steam or other elevated temperature services, it is important that temperatures at the
process connection do not exceed the transmitter’s process temperature limits. See

Temperature limits for details.

Figure 3-8: Installation Examples

Best practices

The piping between the process and the transmitter must accurately transfer the pressure
to obtain accurate measurements. There are five possible sources of error: pressure
transfer, leaks, friction loss (particularly if purging is used), trapped gas in a liquid line,
liquid in a gas line, and density variations between the legs.

The best location for the transmitter in relation to the process pipe is dependent on the
process. Use the following guidelines to determine transmitter location and placement of
impulse piping:

• Keep impulse piping as short as possible.

• For liquid service, slope the impulse piping at least 1 in./ft (8 cm/m) upward from the

transmitter toward the process connection.

• For gas service, slope the impulse piping at least 1 in./ft (8 cm/m) downward from the

transmitter toward the process connection.

• Avoid high points in liquid lines and low points in gas lines.

• Use impulse piping large enough to avoid friction effects and blockage.

• Vent all gas from liquid piping legs.

• When purging, make the purge connection close to the process taps and purge

through equal lengths of the same size pipe. Avoid purging through the transmitter.

• Keep corrosive or hot [above 250 °F (121 °C)] process material out of direct contact

with the sensor module and flanges.

• Prevent sediment deposits in the impulse piping.

• Avoid conditions that might allow process fluid to freeze within the process flange.

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3.4.3 Process connections

Coplanar or traditional process connection

Install and tighten all four flange bolts before applying pressure, or process leakage will
result. When properly installed, the flange bolts will protrude through the top of the
sensor module housing. Do not attempt to loosen or remove the flange bolts while the
transmitter is in service.

Flange adapters

Rosemount 2051DP and GP process connections on the transmitter flanges are ¼–18
NPT. Flange adapters are available with standard ½–14 NPT Class 2 connections. The
flange adapters allow users to disconnect from the process by removing the flange
adapter bolts. Use plant-approved lubricant or sealant when making the process
connections. Refer to dimensional drawings on page 113 for the distance between
pressure connections. This distance may be varied ±¼in. (6.4 mm) by rotating one or both
of the flange adapters.

To install adapters to a Coplanar flange, perform the following procedure:

3.4.4

Procedure

1. Remove the flange bolts.

2. Leaving the flange in place, move the adapters into position with the o-ring

installed.

3. Clamp the adapters and the cCoplanar flange to the transmitter sensor module

using the larger of the bolts supplied.

4. Tighten the bolts. Refer to “Flange bolts” on page 36 for torque specifications.

Example

When removing flanges or adapters, visually inspect the PTFE o-rings. Replace with o-ring
designed for Rosemount transmitter if there are any signs of damage, such as nicks or
cuts. Undamaged o-rings may be reused. If you replace the O-rings, retorque the flange
bolts after installation to compensate for cold flow. Refer to the process sensor body
reassembly procedure in Section 5: Troubleshooting.

Note

PTFE O-rings should be replaced if the flange adapter is removed.

Inline process connection

Inline gauge transmitter orientation

CAUTION

Interfering or blocking the atmospheric reference port will cause the transmitter to output
erroneous pressure values.

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The low side pressure port on the inline gauge transmitter is located in the neck of the
transmitter, behind the housing. The vent path is 360 degrees around the transmitter
between the housing and sensor (See Figure 3-9).

Keep the vent path free of any obstruction, such as paint, dust, and lubrication by
mounting the transmitter so that the process can drain away.

Figure 3-9: Inline gauge low side pressure port

A. Low side pressure port (atmospheric reference)

WARNING

3.5 Rosemount 305, 306, and 304 Manifolds

The Rosemount 305 Integral Manifold is available in two designs: Traditional and Coplanar.
You can mount the traditional Rosemount 305 Integral Manifold to most primary
elements with mounting adapters in the market today. The 306 Integral Manifold is used
with the Rosemount 2051T In-Line Transmitters to provide block-and-bleed valve
capabilities of up to 10000 psi (690 bar).

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Figure 3-10: Manifolds

3.5.1

A. 2051C and 304 Conventional

B. 2051C and 305 Integral Coplanar

C. 2051C and 305 Integral Traditional

D. 2051T and 306 In-Line

Install Rosemount 305 Integral Manifold

Procedure

1. Inspect the PTFE sensor module O-rings.

You may reuse undamaged O-rings. If the O-rings are damaged (if they have nicks
or cuts, for example), replace with O-rings designed for Rosemount transmitters.

Important

If replacing the O-rings, take care not to scratch or deface the O-ring grooves or the
surface of the isolating diaphragm while you remove the damaged O-rings.

2. Install the Integral Manifold on the sensor module. Use the four 2.25-in. (57.2 mm).

manifold bolts for alignment. Finger tighten the bolts; then tighten the bolts
incrementally in a cross pattern to final torque value.

50 Rosemount 2051 Pressure Transmitter

H L

Drain/Vent

valve

Drain/Vent

valve

Isolate
(open)

Isolate
(open)

Process

Equalize
(closed)

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See Flange bolts for complete bolt installation information and torque values. When
fully tightened, the bolts should extend through the top of the sensor
module housing.

3. If you have replaced the PTFE sensor module O-rings, re-tighten the flange bolts

after installation to compensate for cold flow of the O-rings.

Note

Always perform a zero trim on the transmitter/manifold assembly after installation
to eliminate mounting effects.

3.5.2 Install Rosemount 306 integral manifold

The Rosemount 306 Manifold is for use only with in-line pressure transmitters such as the
Rosemount 3051T and 2051T.

Assemble the Rosemount 306 manifold to the Rosemount 3051T or 2051T In-Line
Transmitters with a thread sealant.

3.5.3

3.5.4

Install Rosemount 304 Conventional Manifold

Procedure

1. Align the conventional manifold with the transmitter flange. Use the four manifold

bolts for alignment.

2. Finger tighten the bolts; then tighten the bolts incrementally in a cross pattern to

final torque value.
See Flange bolts for complete bolt installation information and torque values.When

fully tightened, the bolts should extend through the top of the sensor module
housing.

3. Leak-check assembly to maximum pressure range of transmitter.

Integral manifold operation

Three-valve configuration shown.

In normal operation the two isolate valves between the process and instrument ports will
be open and the equalizing valve(s) will be closed.

Reference Manual 51

To zero the 2051, close the isolate valve to the low pressure (downstream side) of the
transmitter first.

H L

Drain/Vent

valve

Isolate
(open)

Drain/Vent

valve

Isolate

(closed)

Process

Equalize

(closed)

H L

Drain/Vent

valve

Isolate
(open)

Drain/Vent

valve

Isolate

(closed)

Process

Equalize

(open)

H L

Drain/Vent

valve

Isolate
(open)

Drain/Vent

valve

Isolate

(closed)

Process

Equalize

(closed)

H L

Drain/Vent

valve

Drain/Vent

valve

Isolate
(open)

Isolate
(open)

Process

Equalize
(closed)

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Next, open the center (equalize) valve(s) to equalize the pressure on both sides of the
transmitter.

The manifold valves are now in the proper configuration for zeroing the transmitter. To
return the transmitter to service, close the equalizing valve(s) first.

Next, open the isolate valve on the low pressure side of the transmitter.

Five-valve Natural Gas configurations shown:

In normal operation, the two block valves between the process and instrument ports will
be open, and the equalizing valves will be closed.

52 Rosemount 2051 Pressure Transmitter

H

L

(Plugged)

Isolate
(open)

Isolate
(open)

(Plugged)

Equalize
(closed)

Equalize
(closed)

Process ProcessDrain vent

(closed)

H

L

(Plugged)

Isolate
(open)

Isolate

(closed)

(Plugged)

Process ProcessDrain vent

(closed)

Equalize

(closed)

Equalize
(closed)

(Plugged)

Isolate
(open)

Equalize

(open)

Equalize
(closed)

Process ProcessDrain vent

(closed)

Isolate

(closed)

(Plugged)

H L

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To zero the Rosemount 2051, first close the block valve on the low pressure (downstream)
side of the transmitter.

Note

Do not open the low side equalize valve before the high side equalize valve. Doing so will
overpressure the transmitter.

Open the equalize valve on the high pressure (upstream) side of the transmitter.

Reference Manual 53

(Plugged)

Isolate
(open)

Equalize

(open)

Equalize

(open)

Process ProcessDrain vent

(closed)

Isolate

(closed)

(Plugged)

H L

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Open the equalize valve on the low pressure (downstream) side of the transmitter. The
manifold is now in the proper configuration for zeroing the transmitter.

Operate three and five-valve manifolds

Performing zero trim at static line pressure

In normal operation, the two isolate (block) valves between the process ports and the
transmitter will be open, and the equalize valve will be closed.

A. Drain/vent valve

B. Isolate (open)

C. Equalize (closed)

D. Process

E. Isolate (open)

F. Drain/vent valve

Procedure

1. To zero trim the transmitter, close the isolate valve on the low side (downstream)

side of the transmitter.

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A. Drain/vent valve
B. Isolate (open)
C. Equalize (closed)

D. Process

E. Isolate (closed)

F. Drain/vent valve

2. Open the equalize valve to equalize the pressure on both sides of the transmitter.

The manifold is now in the proper configuration for performing a zero trim on the
transmitter.

A. Drain/vent valve
B. Isolate (open)
C. Equalize (open)

D. Process

E. Isolate (closed)

F. Drain/vent valve

3. After zeroing the transmitter, close the equalize valve.

A. Drain/vent valve
B. Isolate (open)
C. Equalize (closed)

D. Process

E. Isolate (closed)

F. Drain/vent valve

4. Finally, to return the transmitter to service, open the low side isolate valve.

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A. Drain/vent valve
B. Isolate (open)
C. Equalize (closed)

D. Process

E. Isolate (open)

F. Drain/vent valve

Operate five-valve natural gas manifold

Performing zero trim at static line pressure

Five-valve natural gas configurations shown:

In normal operation, the two isolate (block) valves between the process ports and the
transmitter will be open, and the equalize valves will be closed. Vent valves may be open
or closed.

A. (Plugged)

B. Isolate (open)

C. Process

D. Equalize (closed)

E. Equalize (closed)

F. Drain vent (closed)
G. Process
H. Isolate (open)

I. (Plugged)

Procedure

1. To zero trim the transmitter, first close the isolate valve on the low pressure

(downstream) side of the transmitter and the vent valve.

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A. (Plugged)
B. Isolate (open)
C. Process

D. Equalize (closed)

E. Equalize (closed)

F. Drain vent (closed)
G. Process
H. Isolate (closed)

I. (Plugged)

2. Open the equalize valve on the high pressure (upstream) side of the transmitter.

A. (Plugged)
B. Isolate (open)
C. Process

D. Equalize (open)

E. Equalize (closed)

F. Drain vent (closed)
G. Process
H. Isolate (closed)

I. (Plugged)

3. Open the equalize valve on the low pressure (downstream) side of the transmitter.
The manifold is now in the proper configuration for zeroing the transmitter.

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A. (Plugged)
B. Isolate (open)
C. Process

D. Equalize (open)

E. Equalize (open)

F. Drain vent (closed)
G. Process
H. Isolate (closed)

I. (Plugged)

4. After zeroing the transmitter, close the equalize valve on the low pressure
(downstream) side of the transmitter.

A. (Plugged)
B. Isolate (open)
C. Process

D. Equalize (open)

E. Equalize (closed)

F. Drain vent (closed)
G. Process
H. Isolate (closed)

I. (Plugged)

5. Close the equalize valve on the high pressure (upstream) side.

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A. (Plugged)
B. Isolate (open)
C. Process

D. Equalize (closed)

E. Equalize (closed)

F. Drain vent (closed)
G. Process
H. Isolate (closed)

I. (Plugged)

6. Finally, to return the transmitter to service, open the low side isolate valve and vent
valve.

The vent valve can remain open or closed during operation.

3.5.5

A. (Plugged)
B. Isolate (open)
C. Process

D. Equalize (closed)

E. Equalize (closed)

F. Drain vent (closed)
G. Process
H. Isolate (open)

I. (Plugged)

Adjusting valve packing

Over time, the packing material inside a Rosemount manifold may require adjustment in
order to continue to provide proper pressure retention. Not all Rosemount manifolds have
this adjustment capability. The Rosemount manifold model number will indicate what
type of stem seal or packing material has been used.

The following steps are provided as a procedure to adjust valve packing:

Procedure

1. Remove all pressure from device.

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A

D

C

B

E

F

G

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2. Loosen manifold valve jam nut.

3. Tighten manifold valve packing adjuster nut turn.

4. Tighten manifold valve jam nut.

5. Re-apply pressure and check for leaks.

Example

Above steps can be repeated, if necessary. If the above procedure does not result in proper
pressure retention, the complete manifold should be replaced.

Figure 3-11: Valve Components

A. Bonnet

B. Ball seat

C. Packing

D. Stem

E. Packing adjuster

F. Jam nut

G. Packing follower

3.6 Liquid level measurement

Differential pressure transmitters used for liquid level applications measure hydrostatic
pressure head. Liquid level and specific gravity of a liquid are factors in determining
pressure head. This pressure is equal to the liquid height above the tap multiplied by the
specific gravity of the liquid. Pressure head is independent of volume or vessel shape.

3.6.1

Open vessels

A pressure transmitter mounted near a tank bottom measures the pressure of the liquid
above.

Make a connection to the high pressure side of the transmitter, and vent the low pressure
side to the atmosphere. Pressure head equals the liquid’s specific gravity multiplied by the
liquid height above the tap.

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Zero range suppression is required if the transmitter lies below the zero point of the
desired level range. Figure 3-12 shows a liquid level measurement example.

3.6.2 Closed vessels

Pressure above a liquid affects the pressure measured at the bottom of a closed vessel.
The liquid specific gravity multiplied by the liquid height plus the vessel pressure equals
the pressure at the bottom of the vessel.

To measure true level, the vessel pressure must be subtracted from the vessel bottom
pressure. To do this, make a pressure tap at the top of the vessel and connect this to the
low side of the transmitter. Vessel pressure is then equally applied to both the high and
low sides of the transmitter. The resulting differential pressure is proportional to liquid
height multiplied by the liquid specific gravity.

Dry leg condition

Low-side transmitter piping will remain empty if gas above the liquid does not condense.
This is a dry leg condition. Range determination calculations are the same as those
described for bottom-mounted transmitters in open vessels, as shown in Figure 3-12.

Figure 3-12: Liquid level measurement example

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Wet leg condition

Condensation of the gas above the liquid slowly causes the low side of the transmitter
piping to fill with liquid. The pipe is purposely filled with a convenient reference fluid to
eliminate this potential error. This is a wet leg condition.

The reference fluid will exert a head pressure on the low side of the transmitter. Zero
elevation of the range must then be made. See Figure 3-13.

Figure 3-13: Wet leg example

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Bubbler system in open vessel

A bubbler system that has a top-mounted pressure transmitter can be used in open
vessels. This system consists of an air supply, pressure regulator, constant flow meter,
pressure transmitter, and a tube that extends down into the vessel.

Bubble air through the tube at a constant flow rate. The pressure required to maintain flow
equals the liquid’s specific gravity multiplied by the vertical height of the liquid above the
tube opening. Figure 3-14 shows a bubbler liquid level measurement example.

Figure 3-14: Bubbler liquid level measurement example

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4 Electrical Installation

4.1 Overview

The information in this section covers installation considerations for the Rosemount 2051
Pressure Transmitter with HART® protocol. A Quick Start Guide is shipped with every
transmitter to describe pipe-fitting, wiring procedures and basic configuration for initial
installation.

4.2 Safety messages

Procedures and instructions in this section may require special precautions to ensure the
safety of the personnel performing the operation. Refer to the following safety messages
before performing an operation preceded by this symbol.

WARNING

Explosions

Explosions could result in death or serious injury.

Review the approvals section of this manual for any restrictions associated with a safe
installation.

Before connecting a communicator in an explosive atmosphere, ensure the instruments in
the segment are installed in accordance with intrinsically safe or non-incendive field wiring
practices.

In an explosion-proof/flameproof installation, do not remove the transmitter covers when
power is applied to the unit.

Process leaks

Process leaks may cause harm or result in death.

Install and tighten process connectors before applying pressure.

Electrical shocks

Electrical shock could cause death or serious injury.

Avoid contact with the leads and terminals.High voltage that my be present on leads can
cause electrical shock.

Replacement equipment or spare parts not approved by Emerson for use as spare
parts could reduce the pressure retaining capabilities of the transmitter and may
render the instrument dangerous.

Use only bolts supplied or sold by Emerson as spare parts.

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B

C

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WARNING

Improper assembly of manifolds

Improper assembly of manifolds to traditional flange can damage the SuperModule
Platform.

For safe assembly of manifold to traditional flange, bolts must break black plane of flange
web (i.e., bolt hole) but must not contact module housing.

Physical access

Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or unintentional and
needs to be protected against.

Physical security is an important part of any security program and fundamental to
protecting your system. Restrict physical access by unauthorized personnel to protect end
users’ assets. This is true for all systems used within the facility.

™

4.3 LOI/LCD display

Transmitters ordered with the LCD display option (M5) or LOI option (M4) are shipped with
the display installed. Installing the display on an existing transmitter requires a small
instrument screwdriver. Carefully align the desired display connector with the electronics
board connector. If connectors don't align, the display and electronics board are not
compatible.

Figure 4-1: LCD Display

A. Jumpers (top and bottom)

B. LCD display

C. Extended cover

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4.3.1 Rotating LOI/LCD display

Procedure

1. Secure the loop to manual control and remove power to transmitter.

2. Remove transmitter housing cover.

3. Remove screws from the LCD display and rotate to desired orientation.
a) Insert 10 pin connector into the display board for the correct orientation.

Carefully align pins for insertion into the output board.

4. Re-insert screws.

5. Reattach transmitter housing cover; it is recommended the cover be tightened until

there is no gap between the cover and housing to comply with explosion proof
requirements.

6. Re-attach power and return loop to automatic control.

4.4 Configure security and simulation

There are four security methods with the Rosemount 2051 Transmitter.

• Security switch

• HART Lock

• Configuration buttons lock

• LOI password

Figure 4-2: 4–20 mA Electronics Board

without LCD meter

with LCD display

A. Alarm
B. Security

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Note

1-5 Vdc alarm and security switches are located in the same location as 4-20 mA output
boards.

4.4.1 Setting security switch

The security switch is used to prevent changes to the transmitter configuration data. If the
security switch is set to the locked (

sent via HART®, LOI, or local configuration buttons will be rejected by the transmitter and
the transmitter configuration data will not be modified. Reference Figure 4-2 for the
location of the security switch. Follow the steps below to enable the security switch.

Procedure

1. Set loop to manual and remove power.

2. Remove transmitter housing cover.

3. Use a small screwdriver to slide the switch to the locked ( ) position.

4. Replace transmitter housing cover; cover must be fully engaged to comply with

explosion proof requirements.

) location, any transmitter configuration requests

4.4.2

HART Lock

The HART® Lock prevents changes to the transmitter configuration from all sources; all
changes requested via HART, LOI, and local configuration buttons will be rejected. The
HART Lock can only be set via HART communication, and is only available in HART Revision
7 mode. The HART Lock can be enabled or disabled with a Field Communicator or AMS
Device Manager.

Configuring HART Lock using Field Communicator

From the HOME screen, enter the fast key sequence.

Device Dashboard Fast Keys

Procedure

1. Right click on the device and select Configure.

2. Under Manual Setup select the Security tab.

3. Select Lock/Unlock button under HART Lock (Software) and follow the screen

prompts.

Configuring HART Lock using AMS Device Manager

Procedure

1. Right click on the device and select Configure.

2. Under Manual Setup select the Security tab.

3. Select Lock/Unlock button under HART Lock (Software) and follow the screen

prompts.

2, 2, 6, 4

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4.4.3 Configuration Button lock

The configuration button lock disables all local button functionality. Changes to the
transmitter configuration from the LOI and local buttons will be rejected. Local external
keys can be locked via HART® communication only.

Configuring configuration button lock using a Field Communicator

From the HOME screen, enter the fast key sequence

Device Dashboard Fast Keys 2, 2, 6, 3

Procedure

1. Right click on the device and select Configure.

2. Under Manual Setup select the Security tab.

3. Within the Configuration Buttons dropdown menu select Disabled to lock external

local keys.

4. Select Send.

5. Confirm service reason and select Yes.

4.4.4

Configuring configuration button lock using AMS Device Manager

Procedure

1. Right select the device and select Configure.

2. Under Manual Setup select the Security tab.

3. Within the Configuration Buttons dropdown menu select Disabled to lock external

local keys.

4. Select Send.

5. Confirm service reason and click Yes.

LOI Password

A LOI Password can be entered and enabled to prevent review and modification of device
configuration via the LOI. This does not prevent configuration from HART® or external keys
(analog zero and span; Digital Zero Trim). The LOI password is a 4 digit code that is to be
set by the user. If the password is lost or forgotten the master password is “9307”.

The LOI password can be configured and enabled/disabled by HART Communication via a
Field Communicator, AMS Device Manager, or the LOI.

Configuring password with Field Communicator

From the HOME screen, enter the Fast Key sequence.

Device Dashboard Fast Keys

Reference Manual 69

2, 2, 6, 5, 2

EXTENDED MENU

CALIBRAT
DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN P
TAG
ALARM SAT VALUES

PASSWORD

SIMULATE
HART REV
BACK TO MENU
EXIT MENU

PASSWORD

PASSWORD ENABLE
CHANGE PASSWORD
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

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Configuring password with AMS Device Manager

Procedure

1. Right select the device and select Configure.

2. Under Manual Setup select the Security tab.

3. Within the LOI select the Configure Password button and follow the screen

prompts.

Configuring LOI password using LOI

Figure 4-3: LOI Password

4.5 Setting transmitter alarm

4.6 Electrical considerations

70 Rosemount 2051 Pressure Transmitter

On the electronics board is an alarm switch, reference Figure 1 for switch location. Follow
the steps below to change the alarm switch location:

Procedure

1. Set loop to manual and remove power.

2. Remove transmitter housing cover.

3. Use a small screwdriver to slide switch to desired position.

4. Replace transmitter cover; cover must be fully engaged to comply with explosion

proof requirements.

Note

Make sure all electrical installation is in accordance with national and local code
requirements.

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WARNING

Electrical shock

Electrical shock can result in death or serious injury.

Do not run signal wiring in conduit or open trays with power wiring or near heavy electrical
equipment.

4.6.1 Conduit installation

CAUTION

If all connections are not sealed, excess moisture accumulation can damage the
transmitter. Make sure to mount the transmitter with the electrical housing positioned
downward for drainage. To avoid moisture accumulation in the housing, install wiring with
a drip loop, and ensure the bottom of the drip loop is mounted lower than the conduit
connections of the transmitter housing.

4.6.2

Recommended conduit connections are shown in Figure 4-4.

Figure 4-4: Conduit Installation Diagrams

A. Possible conduit line positions

B. Sealing compound

Power supply

4–20 mA HART® (option code A)

Transmitter operates on 10.5–42.4 Vdc at the terminal of the transmitter. The DC power
supply should provide power with less than two percent ripple. A minimum of 16.6 V is
required for loops with a 250 Ω resistance.

Note

A minimum loop resistance of 250 Ω is required to communicate with a Field
Communicator. If a single power supply is used to power more than one Rosemount 2051

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Transmitter, the power supply used, and circuitry common to the transmitters, should not
have more that 20 Ω of impedance at 1200 Hz.

Figure 4-5: Load Limitation

• Maximum loop resistance = 43.5 × (power supply voltage – 10.5)

• The Field Communicator requires a minimum loop resistance of 250 Ω for

communication.

The total resistance load is the sum of the resistance of the signal leads and the load
resistance of the controller, indicator, I.S. Barriers, and related pieces. If intrinsic safety
barriers are used, the resistance and voltage drop must be included.

4.6.3

1–5 Vdc low power HART® (output code M)

Low power transmitters operate on 9–28 Vdc. The DC power supply should provide power
with less than 2 percent ripple. The V

load should be 100 kΩ or greater.

out

Wiring the transmitter

CAUTION

Do not connect the power signal wiring to the test terminals. Incorrect wiring can damage
test circuit.

Note

Use shielded twisted pairs to yield best results. To ensure proper communication, use 24
AWG or larger wire and do not exceed 5000 ft. (1500 m). For 1–5 V 500 ft. (150 m)
maximum are recommended. unpaired three conductor or two twisted pairs is
recommended.

72 Rosemount 2051 Pressure Transmitter

A

B

A

B

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Figure 4-6: Wiring the Transmitter (4–20 mA HART)

A. DC power supply

B. RL≥ 250 (necessary for HART® Communication only)

Figure 4-7: Wiring the Transmitter (1–5 Vdc low power)

A. DC power supply

B. Voltmeter

Perform the following procedure to make wiring connections:

Procedure

1. Remove the housing cover on terminal compartment side. Do not remove the

cover in explosive atmospheres when the circuit is live. Signal wiring supplies all
power to the transmitter.

2. For 4–20 mA HART Output, connect the positive lead to the terminal marked (pwr/

comm+) and the negative lead to the terminal marked (pwr/comm–). Do not
connect the powered signal wiring to the test terminals. Power could damage the
test diode.

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a) For 1–5 Vdc HART Output, connect the positive lead to (PWR +) and the

negative to the (PWR–). Do not connect the powered signal wiring to the test
terminals. Power could damage the test diode.

3. Plug and seal unused conduit connection on the transmitter housing to avoid

moisture accumulation in the terminal side.

4.6.4 Grounding the transmitter

Signal cable shield grounding

Signal cable shield grounding is summarized in Figure 4-8. The signal cable shield and
unused shield drain wire must be trimmed and insulated, ensuring the signal cable shield
and drain wire do not come in contact with the transmitter case. See Transmitter case

groundingTransmitter case grounding for instructions on grounding the transmitter case.

Follow the steps below to correctly ground the signal cable shield.

Procedure

1. Remove the field terminals housing cover.

2. Connect the signal wire pair at the field terminals as indicated in Figure 4-6.

3. At the field terminals, the cable shield and shield drain wire should be trimmed

close and insulated from transmitter housing.

4. Reattach the field terminals housing cover; cover must be fully engaged to comply

with explosion proof requirements.

5. At terminations outside the transmitter housing, the cable shield drain wire should

be continuously connected.

a) Prior to the termination point, any exposed shield drain wire should be

insulated as shown in Figure 4-7 (B).

6. Properly terminate the signal cable shield drain wire to an earth ground at or near

the power supply.

74 Rosemount 2051 Pressure Transmitter

DP

A

B

C

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Example

Figure 4-8: Wiring Pair and Ground

A. Insulate Shield and shield drain wire

B. Insulate exposed shield drain wire

C. Terminate cable shield drain wire to earth ground

Transmitter case grounding

Always ground the transmitter case in accordance with national and local electrical codes.
The most effective transmitter case grounding method is a direct connection to earth
ground with minimal impedance. Methods for grounding the transmitter case include:

• Internal ground connection: The internal ground connection screw is inside the FIELD

TERMINALS side of the electronics housing. This screw is identified by a ground symbol

). The ground connection screw is standard on all Rosemount 2051 Transmitters.

(
Refer to Figure 4-9.

• External ground connection: The external ground connection is located on the exterior

of the transmitter housing. Refer to Figure 4-10. This connection is only available with
option V5 and T1.

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Figure 4-9: Internal Ground Connection

A. Internal ground location

Figure 4-10: External Ground Connection (Option V5 or T1)

A. External ground location

Note

Grounding the transmitter case via threaded conduit connection may not provide
sufficient ground continuity.

Transient protection terminal block grounding

The transmitter can withstand electrical transients of the energy level usually encountered
in static discharges or induced switching transients. However, high-energy transients,
such as those induced in wiring from nearby lightning strikes, can damage the transmitter.

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The transient protection terminal block can be ordered as an installed option (code T1) or
as a spare part to retrofit existing transmitters in the field. See Spare parts for part
numbers. The lightning bolt symbol shown in Figure 4-11 identifies the transient
protection terminal block.

Figure 4-11: Transient Protection Terminal Block

A. Lightning bolt location

Note

The transient protection terminal block does not provide transient protection unless the
transmitter case is properly grounded. Use the guidelines to ground the transmitter case.
Refer to Figure 4-11.

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78 Rosemount 2051 Pressure Transmitter

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5 Operation and Maintenance

5.1 Overview

This section contains information on operation and maintenance procedures.

Field Communicator and AMS Device Manager instructions are given to perform
configuration functions.

5.2 Safety messages

Procedures and instructions in this section may require special precautions to ensure the
safety of the personnel performing the operation. Refer to the following safety messages
before performing an operation preceded by this symbol.

WARNING

Explosions

Explosions could result in death or serious injury.

Review the approvals section of this manual for any restrictions associated with a safe
installation.

Before connecting a communicator in an explosive atmosphere, ensure the instruments in
the segment are installed in accordance with intrinsically safe or non-incendive field wiring
practices.

In an explosion-proof/flameproof installation, do not remove the transmitter covers when
power is applied to the unit.

Process leaks

Process leaks may cause harm or result in death.

Install and tighten process connectors before applying pressure.

Electrical shocks

Electrical shock could cause death or serious injury.

Avoid contact with the leads and terminals.High voltage that my be present on leads can
cause electrical shock.

Replacement equipment or spare parts not approved by Emerson for use as spare
parts could reduce the pressure retaining capabilities of the transmitter and may
render the instrument dangerous.

Use only bolts supplied or sold by Emerson as spare parts.

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WARNING

Improper assembly of manifolds

Improper assembly of manifolds to traditional flange can damage the SuperModule
Platform.

For safe assembly of manifold to traditional flange, bolts must break black plane of flange
web (i.e., bolt hole) but must not contact module housing.

Physical access

Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or unintentional and
needs to be protected against.

Physical security is an important part of any security program and fundamental to
protecting your system. Restrict physical access by unauthorized personnel to protect end
users’ assets. This is true for all systems used within the facility.

™

5.3 Recommended calibration tasks

CAUTION

Absolute pressure transmitters are calibrated at the factory. Trimming adjusts the position
of the factory characterization curve. It is possible to degrade performance of the
transmitter if any trim is done improperly or with inaccurate equipment.

5.3.1

Field installation tasks

Procedure

1. Perform sensor zero/lower trim: Compensate for mounting pressure effects

a) Refer to Install Rosemount 306 integral manifold for manifold operation

instructions to properly drain/vent valves.

2. Set/check basic configuration parameters.

a) Output units

b) Range points

c) Output type

d) Damping value

5.3.2

80 Rosemount 2051 Pressure Transmitter

Bench calibration tasks

Procedure

1. Perform optional 4–20 mA 1–5 Vdc output trim.

Reference Manual Operation and Maintenance

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2. Perform a sensor trim.

a) Zero/lower trim Troubleshooting tables using line pressure effect correction.

Refer to Install Rosemount 306 integral manifold for manifold drain/vent
valve operation instructions.

b) Optional full scale trim. Sets the span of the device and requires accurate

calibration equipment.

c) Set/check basic configuration parameters.

5.4 Calibration overview

The pressure transmitter is an accurate instrument that is fully calibrated in the factory.
Field calibration is provided to the user to meet plant requirements or industry standards.
Complete calibration of the transmitter can be split into two tasks:

1. Sensor calibration

2. Analog output calibration

5.4.1

5.4.2

Sensor Calibration and Analog Output Calibration.

Sensor calibration allows the user to adjust the pressure (digital value) reported by the
transmitter to be equal to a pressure standard. The sensor calibration can adjust the
pressure offset to correct for mounting conditions or line pressure effects. This correction
is recommended. The calibration of the pressure range (pressure span or gain correction)
requires accurate pressure standards (sources) to provide a full calibration.

Like the Sensor calibration, the analog output can be calibrated to match the user
measurement system. The Analog Output Trim (4–20 mA/ 1–5 V output trim) will
calibrate the loop at the 4 mA (1 V) and 20 mA (5 V) points.

The Sensor calibration and the analog output calibration combine to match the
transmitter’s measurement system to the plant standard.

Calibrate the sensor

• Sensor trim: (Perform a sensor trim )

• Zero trim: (Performing a digital zero trim (option DZ))

Calibrate the 4–20 mA output

• 4–20 mA/1–5V Output trim (Performing digital-to-analog trim (4–20 mA/1–5 V

output trim))

• 4–20 mA/1–5V Output trim using other scale (Performing digital-to-analog trim (4–20

mA/1–5 V output trim) using other scale)

5.4.3

Reference Manual 81

Determining necessary sensor trims

Bench calibrations allow for calibrating the instrument for its desired range of operation.
Straight forward connections to pressure source allow for a full calibration at the planned

Operation and Maintenance Reference Manual

September 2020 00809-0100-4107

operating points. Exercising the Transmitter over the desired pressure range allows for
verification of the analog output. Trim the pressure signal discusses how the trim
operations change the calibration. It is possible to degrade the performance of the
transmitter if a trim is done improperly or with inaccurate equipment. The transmitter can
be set back to factory settings using the Recall factory trim—sensor trim.

For transmitters that are field installed, the manifolds discussed in Rosemount 305, 306,
and 304 Manifolds allow the differential transmitter to be zeroed using the zero trim
function. Both 3-valve and 5-valve manifolds are discussed. This field calibration will
eliminate any pressure offsets caused by mounting effects (head effect of the oil fill) and
static pressure effects of the process.

Determine the necessary trims with the following steps.

Procedure

1. Apply pressure.

2. Check digital pressure, if the digital pressure does not match the applied pressure,

perform a digital trim. See Perform a sensor trim .

3. Check reported analog output against the live analog output. If they do not match,

perform an analog output trim. See Performing digital-to-analog trim (4–20 mA/1–

5 V output trim).

5.4.4

Trimming with configuration buttons

Local configuration buttons are external buttons located underneath the top tag of the
transmitter. There are two possible sets of local configuration buttons that can be ordered
with the transmitter and used to perform trim operations: Digital zero trim and LOI. To
access the buttons, loosen screw and rotate top tag until buttons are visible.

• LOI (M4): Can perform both digital Sensor Trim and the 4–20 mA Output Trim (analog

output trim). Follow the same procedures listed in trimming with Field Communicator
or AMS Device Manager listed below.

• Digital zero trim (DZ): Used for performing a sensor zero trim. See Determining

calibration frequency for trim instructions.

All configuration changes should be monitored by a display or by measuring the loop
output. Figure 5-1 shows the physical differences between the two sets of buttons.

Figure 5-1: Local Configuration Button Options

A. LOI - greeb retainer

B. Digital zero trim - blue retainer

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5.5 Determining calibration frequency

Calibration frequency can vary greatly depending on the application, performance
requirements, and process conditions. Use the following procedure to determine
calibration frequency that meets the needs of your application.

Procedure

1. Determine the performance required for your application.

2. Determine the operating conditions.

3. Calculate the Total Probable Error (TPE).

4. Calculate the stability per month.

5. Calculate the calibration frequency.

5.5.1

Sample calculation for Rosemount 2051

Procedure

1. Determine the performance required for your application.

Required Performance 0.30% of span

2. Determine the operating conditions.

Transmitter

Calibrated Span 150 inH2O (374 mbar)

Ambient Temperature
Change

Line Pressure 500 psig (34,5 bar)

3. Calculate total probable error (TPE).

TPE =
of span

Where:

Reference
Accuracy =

± 0.065% of span

Rosemount 2051CD, Range 2 [URL=250
inH2O(623 mbar)]

± 50 °F (28 °C)

= 0.189%

Ambient
Temperature
Effect =

Span Static
Pressure
Effect=

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Note

Zero static pressure effect removed by zero trimming at line pressure.

4. Calculate the stability per month.

5. Calculate calibration frequency.

5.5.2 Sample calculation for Rosemount 2051C with P8 option (0.05% accuracy & 5-year stability)

Procedure

1. Determine the performance required for your application.

Required Performance 0.30% of span

2. Determine the operating conditions.

Transmitter

Calibrated Span 150 inH2O (374 mbar)

Ambient Temperature Change ± 50 °F (28 °C)

Line Pressure 500 psig (34,5 bar)

3. Calculate total probable error (TPE).

TPE =
of span

Where:

Reference
Accuracy =

Ambient
Temperature
Effect =

± 0.05% of span

2051CD, Range 2 [URL=250 inH2O(623 mbar)]

= 0.117%

Span Static
Pressure
Effect=

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Note

Zero static pressure effect removed by zero trimming at line pressure.

4. Calculate the stability per month.

5. Calculate calibration frequency.

5.6 Compensating for span line pressure effects (range 4 and 5)

Rosemount 2051 Range 4 and 5 Pressure Transmitters require a special calibration
procedure when used in differential pressure applications. The purpose of this procedure is
to optimize transmitter performance by reducing the effect of static line pressure in these
applications. The Rosemount Differential Pressure Transmitters (ranges 1 through 3) do
not require this procedure because optimization occurs at the sensor.

5.6.1

The systematic span shift caused by the application of static line pressure is –0.95 percent
of reading per 1000 psi (69 bar) for Range 4 transmitters and –1 percent of reading per
1000 psi (69 bar) for Range 5 transmitters. Using the following procedure, you can correct
the span effect to ±0.2 percent of reading per 1000 psi (69 bar) for line pressures from 0 to
3626 psi (0 to 250 bar).

Use the following example to compute correct input values.

Example

To correct for systematic error caused by high static line pressure, first use the following
formulas to determine the corrected values for the high trim value.

High trim value

HT = (URV – [S/100 ×P/1000 × LRV])

Where:

In this example:

URV =

S = –0.95%

HT = Corrected high trim value

URV = Upper range value

S = Span shift per specification (as a percent of reading)

P = Static Line Pressure in psi

1500 inH2O (3.74 bar)

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P = 1200 psi

LT = 1500 – (–0.95%/100 × 1200 psi/1000 psi × 1500 inH2O)

LT = 1517.1 inH2O

Complete the upper sensor trim procedure as described in #unique_191. However, enter
the calculated correct upper sensor trim value of 1517.1 inH2O with a Field
Communicator.

5.7 Trim the pressure signal

5.7.1 Sensor trim overview

A sensor trim corrects the pressure offset and pressure range to match a pressure
standard. The upper sensor trim corrects the pressure range and the lower sensor trim
(Zero Trim) corrects the pressure offset. An accurate pressure standard is required for full
calibration. A zero trim can be performed if the process is vented, or the high and low side
pressure are equal (for differential pressure transmitters).

Zero trim is a single-point offset adjustment. It is useful for compensating for mounting
position effects and is most effective when performed with the transmitter installed in its
final mounting position. Since this correction maintains the slope of the characterization
curve, it should not be used in place of a sensor trim over the full sensor range.

When performing a zero trim, ensure the equalizing valve is open and all wet legs are filled
to the correct levels. Line pressure should be applied to the transmitter during a zero trim
to eliminate line pressure errors. Refer to Integral manifold operation.

Note

FOUNDATION Fieldbus has no analog signal that needs ranging. Therefore, ranging a new
device prior to installation is usually not necessary or recommended.

Note

Do not perform a zero trim on Rosemount 2051T Absolute Pressure Transmitters. Zero
trim is zero based, and absolute pressure transmitters reference absolute zero. To correct
mounting position effects on an absolute pressure transmitter, perform a low trim within
the sensor trim function. The low trim function provides an offset correction similar to the
zero trim function, but it does not require zero-based input.

Upper and lower sensor trim is a two-point sensor calibration where two end-point
pressures are applied, all output is linearized between them, and requires an accurate
pressure source. Always adjust the low trim value first to establish the correct offset.
Adjustment of the high trim value provides a slope correction to the characterization curve
based on the low trim value. The trim values help optimize performance over a specific
measurement range.

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Figure 5-2: Sensor Trim Example

A. Before Trim

B. After Trim

5.7.2

Perform a sensor trim

When performing a Sensor Trim, both the upper and lower limits can be trimmed. If both
upper and lower trims are to be performed, the lower trim must be done prior to the upper
time.

Note

Use a pressure input source that is at least four times more accurate than the transmitter,
and allow the input pressure to stabilize for 10 seconds before entering any values.

Performing a sensor trim with a Field Communicator

From the HOME screen, enter the Fast Key sequence and follow the steps within the Field
Communicator to complete the sensor trim.

Device Dashboard Fast Keys

To calibrate the sensor with a Field Communicator using the sensor trim function, perform
the following procedure:

Procedure

1. Select 2: Lower Sensor Trim.

Note

Select pressure points so that lower and upper values are equal to or outside the
expected process operation range. This can be done by going toRerange the

transmitter.

3, 4, 1

2. Follow the commands provided by the Field Communicator to complete the
adjustment of the lower value.

3. Select 3: Upper Sensor Trim.

4. Follow the commands provided by the Field Communicator to complete the
adjustment of the upper value.

Reference Manual 87

EXTENDED MENU

CALIBRAT

DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT VALUES
PASSWORD
SIMULATE
HART REV
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

CALIBRAT

ZERO TRIM

LOWER TRIM
UPPER TRIM

ANALOG TRIM
FACTORY RECALL
BACK TO MENU
EXIT MENU

Operation and Maintenance Reference Manual

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Performing a sensor trim with AMS Device Manager

Right click the device and, under the Method drop down menu, move cursor over Calibrate
and, under Sensor Trim, select Lower Sensor Trim.

Procedure

1. Follow the screen prompts to perform a sensor trim using AMS Device Manager.

2. If desired, right select the device and under the Method drop down menu, move
cursor over Calibrate and under Sensor Trim and select Upper Sensor Trim.

Performing a sensor trim using LOI

Perform an upper and lower sensor trim by referencing Figure 5-3.

Figure 5-3: Sensor trim with LOI

Performing a digital zero trim (option DZ)

A digital zero trim (option DZ) provides the same function as a zero/lower sensor trim, but
can be completed in hazardous areas at any given time by simply pushing the zero trim
button when the transmitter is at zero pressure. If the transmitter is not close enough to
zero when the button is pushed, the command may fail due to excess correction. If
ordered, a Digital Zero Trim can be performed by utilizing external configuration buttons
located underneath the top tag of the transmitter, see Figure 5-1 for DZ button location.

Procedure

1. Loosen the top tag of the transmitter to expose buttons.

2. Press and hold the digital zero button for at least two seconds, then release to
perform a digital zero Trim.

5.7.3

88 Rosemount 2051 Pressure Transmitter

Recall factory trim—sensor trim

The recall factory trim-sensor trim command allows the restoration of the as-shipped
factory settings of the Sensor Trim. This command can be useful for recovering from an
inadvertent zero trim of an absolute pressure unit or inaccurate pressure source.

EXTENDED MENU

CALIBRAT

DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT VALUES
PASSWORD
SIMULATE
HART REV
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

CALIBRAT

ZERO TRIM
LOWER TRIM
UPPER TRIM
ANALOG TRIM

FACTORY RECALL

BACK TO MENU
EXIT MENU

FACTORY RECALL

SENSOR RECALL

ANALOG RECALL
BACK TO MENU
EXIT MENU

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Recalling factory trim with a Field Communicator

From the HOME screen, enter the Fast Key sequence and follow the steps within the Field
Communicator to complete the sensor trim.

Device Dashboard Fast Keys 3, 4, 3

Recalling factory trim with AMS Device Manager

Procedure

1. Right select on the device and, under the Method drop down menu, move cursor
over Calibrate and select Restore Factory Calibration.

2. Set the control loop to manual.

3. Select Next.

4. Select Sensor Trim under Trim to recall and click Next.

5. Follow the screen prompts to recall Sensor Trim.

Recalling factory trim with LOI

Refer to Figure 5-4 to recall factory sensor trim.

Figure 5-4: Recall Factory Trim with LOI

5.8 Trim the analog output

The Analog Output Trim commands allow you to adjust the transmitter’s current output
at the 4 and 20 mA (1 – 5 Vdc) points to match the plant standards. This trim is performed
after the digital to analog conversion so only the 4–20 mA analog (1– 5 Vdc) signal will be
affected. Figure 5-5 graphically shows the two ways the characterization curve is affected
when an analog output trim is performed.

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Figure 5-5: Analog Output Trim Example

A. Before trim

B. After Trim

5.8.1

Performing digital-to-analog trim (4–20 mA/1–5 V output trim)

Note

If a resistor is added to the loop, ensure that the power supply is sufficient to power the
transmitter to a 20 mA output with additional loop resistance. Refer to Power supply.

Performing a 4–20 mA/1–5 V output trim with a Field Communicator

From the HOME screen, enter the Fast Key sequence and follow the steps within the Field
Communicator to complete the 4–20 mA output trim.

Device Dashboard Fast Keys

Performing a 4–20 mA/1–5 V output trim with AMS Device Manager

Right select the device and, under the Method drop down menu, move cursor over
Calibrate and select Analog Calibration.

Procedure

1. Select Digital to Analog Trim.

2. Follow the screen prompts to perform a 4–20 mA output trim.

3, 4, 2, 1

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EXTENDED MENU

CALIBRAT

DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT VALUES
PASSWORD
SIMULATE
HART REV
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

CALIBRAT

ZERO TRIM
LOWER TRIM
UPPER TRIM

ANALOG TRIM

FACTORY RECALL
BACK TO MENU
EXIT MENU

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Performing 4–20 mA/1–5 V output trim using LOI

Figure 5-6: 4–20 mA output trim using LOI

5.8.2 Performing digital-to-analog trim (4–20 mA/1–5 V output trim) using other scale

The scaled 4–20 mA output Trim command matches the 4 and 20 mA points to a user
selectable reference scale other than 4 and 20 mA [for example, 2 to 10 volts if measuring
across a 500 Ω load, or 0 to 100 percent if measuring from a Distributed Control System
(DCS)]. To perform a scaled 4–20 mA output trim, connect an accurate reference meter to
the transmitter and trim the output signal to scale, as outlined in the output trim
procedure.

Performing a 4–20/1–5 V mA output trim using other scale with a Field Communicator

From the HOME screen, enter the Fast Key sequence and follow the steps within the Field
Communicator to complete the 4–20 mA output trim using other scale.

Device Dashboard Fast Keys

3, 4, 2, 2

Performing a 4–20 mA/ 1–5 V output trim using other scale with AMS Device Manager

Procedure

1. Right select the device and under the Method drop down menu, move cursor over
Calibrate and select Analog Calibration.

2. Select Scaled Digital to Analog Trim.

3. Follow screen prompts to perform a 4–20 mA/ 1–5 V Output Trim.

Reference Manual 91

EXTENDED MENU

CALIBRAT

DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT VALUES
PASSWORD
SIMULATE
HART REV
BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

CALIBRAT

ZERO TRIM
LOWER TRIM
UPPER TRIM
ANALOG TRIM

FACTORY RECALL

BACK TO MENU
EXIT MENU

FACTORY RECALL

SENSOR RECALL

ANALOG RECALL

BACK TO MENU
EXIT MENU

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5.8.3 Recalling factory trim—analog output

The Recall Factory Trim—Analog Output command allows the restoration of the as­shipped factory settings of the analog output trim. This command can be useful for
recovering from an inadvertent trim, incorrect Plant Standard or faulty meter.

Recalling factory trim - analog output with a Field Communicator

From the HOME screen, enter the Fast Key sequence and follow the steps within the Field
Communicator to complete the digital to analog trim using other scale.

Device Dashboard Fast Keys 3, 4, 3

Recalling factory trim - analog output with AMS Device Manager

Procedure

1. Right select the device and, under the Method drop down menu, move cursor over
Calibrate and select Restore Factory Calibration.

2. Select Next to set the control loop to manual.

3. Select Analog Output Trim under Select trim to recall and click Next.

4. Follow screen prompts to recall analog output trim.

Recalling factory trim - analog output with LOI

Reference Figure 5-7 for LOI instructions.

Figure 5-7: Recall factory Trim – Analog Output with LOI

5.9 Switching HART revision

Some systems are not capable of communicating with HART® Revision 7 devices. The
following procedures list how to change HART revisions between HART Revision 7 and
HART Revision 5.

92 Rosemount 2051 Pressure Transmitter

EXTENDED MENU

CALIBRAT
DAMPING
TRANSFER FUNCT
SCALED VARIAB
ASSIGN PV
TAG
ALARM SAT VALUES
PASSWORD
SIMULATE

HART REV

BACK TO MENU
EXIT MENU

VIEW CONFIG
ZERO TRIM
UNITS
RERANGE
LOOP TEST
DISPLAY

EXTENDED MENU

EXIT MENU

Reference Manual Operation and Maintenance

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5.9.1 Switching HART revision with generic menu

If the HART® configuration tool is not capable of communicating with a HART Revision 7
device, it should load a generic menu with limited capability. The following procedures
allow for switching between HART Revision 7 and HART Revision 5 from a generic menu.

Procedure

1. Locate “Message” field.

2. To change to HART Revision 5, Enter: HART5 in the message field.

3. To change to HART Revision 7, Enter: HART7 in the message field.

5.9.2 Switching HART revision with Field Communicator

From the HOME screen, enter the Fast Key sequence and follow steps within the Field
Communicator to complete the HART® revision change.

From the HOME screen, enter the Fast Key
sequence

Device Dashboard Fast Keys 2, 2, 5, 2, 4 2, 2, 5, 2, 3

HART5 HART7

5.9.3 Switching HART revision with AMS Device Manager

Procedure

1. Select Manual Setup and select HART.

2. Select Change HART Revision, then follow the on screen prompts.

Note

AMS Device Manager versions 10.5 or greater are compatible with HART Revision 7.

5.9.4

Switching HART revision with LOI

Navigate to HART® REV within the extended menu and select either HART REV 5 or HART
REV 7. Use Figure 5-8 below to change HART Revision:

Figure 5-8: Change HART Revision with LOI

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6 Troubleshooting

6.1 Overview

Table 6-1 and Table 6-2 provide summarized maintenance and troubleshooting

suggestions for the most common operating problems.

If you suspect malfunction despite the absence of any diagnostic messages on the Field
Communicator display, consider using Diagnostic messages to identify any potential
problem.

6.2 Safety messages

Procedures and instructions in this section may require special precautions to ensure the
safety of the personnel performing the operation. Refer to the following safety messages
before performing an operation preceded by this symbol.

WARNING

Explosions

Explosions could result in death or serious injury.

Review the approvals section of this manual for any restrictions associated with a safe
installation.

Before connecting a communicator in an explosive atmosphere, ensure the instruments in
the segment are installed in accordance with intrinsically safe or non-incendive field wiring
practices.

In an explosion-proof/flameproof installation, do not remove the transmitter covers when
power is applied to the unit.

Process leaks

Process leaks may cause harm or result in death.

Install and tighten process connectors before applying pressure.

Electrical shocks

Electrical shock could cause death or serious injury.

Avoid contact with the leads and terminals.High voltage that my be present on leads can
cause electrical shock.

Replacement equipment or spare parts not approved by Emerson for use as spare
parts could reduce the pressure retaining capabilities of the transmitter and may
render the instrument dangerous.

Use only bolts supplied or sold by Emerson as spare parts.

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WARNING

Improper assembly of manifolds

Improper assembly of manifolds to traditional flange can damage the SuperModule
Platform.

For safe assembly of manifold to traditional flange, bolts must break black plane of flange
web (i.e., bolt hole) but must not contact module housing.

Physical access

Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or unintentional and
needs to be protected against.

Physical security is an important part of any security program and fundamental to
protecting your system. Restrict physical access by unauthorized personnel to protect end
users’ assets. This is true for all systems used within the facility.

™

6.3 Service support

Within the United States, call the Emerson Instrument and Valve 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.

For inquiries outside of the United States, contact the nearest Emerson representative for
RMA instructions.

To expedite the return process outside of the United States, contact the nearest Emerson
representative.

CAUTION

Individuals who handle products exposed to a hazardous substance can avoid injury if they
are informed of and understand the hazard. The product being returned will require a copy
of the required Safety Data Sheet (SDS) for each substance must be included with the
returned goods.

Emerson Instrument and Valve Response Center representatives will explain the additional
information and procedures necessary to return goods exposed to hazardous substances.

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6.4 Troubleshooting tables

Table 6-1: Rosemount troubleshooting table for 4–20 mA output

Symptom Corrective actions

Transmitter milliamp reading is zero Verify terminal voltage is 10.5 to 42.4 Vdc at

signal terminals

Check power wires for reversed polarity

Check that power wires are connected to signal
terminals

Check for open diode across test terminal

Transmitter not communicating with
Field Communicator

Transmitter milliamps reading is low or high Verify applied pressure

Transmitter will not respond to changes in
applied pressure

Verify terminal voltage is 10.5 to 42.4 Vdc

Check loop resistance, 250 Ω minimum (PS
voltage -transmitter voltage/loop current)

Check that power wires are connected to signal
terminals and not test terminals

Verify clean DC Power to transmitter (Max AC
noise 0.2 volts peak to peak)

Verify the output is between 4 and 20 mA or
saturation levels

Have Field Communicator poll for all addresses

Verify 4 and 20 mA range points

Verify output is not in alarm condition

Perform analog trim

Check that power wires are connected to the
correct signal terminals (positive to positive,
negative to negative) and not the test terminal

Check impulse piping or manifold for blockage

Verify applied pressure is between the 4 and 20
mA points

Verify the output is not in alarm condition

Verify transmitter is not in loop test mode

Verify transmitter is not in multidrop mode

Check test equipment

Digital pressure variable reading is low or high Check impulse piping for blockage or low fill in

wet leg

Verify transmitter is calibrated properly

Check test equipment (verify accuracy)

Verify pressure calculations for application

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Table 6-1: Rosemount troubleshooting table for 4–20 mA output (continued)

Symptom Corrective actions

Digital pressure variable reading is erratic Check application for faulty equipment in

pressure line

Verify transmitter is not reacting directly to
equipment turning on/off

Verify damping is set properly for application

Milliamps reading is erratic Verify power source to transmitter has adequate

voltage and current

Check for external electrical interference

Verify transmitter is properly grounded

Verify shield for twisted pair is only grounded at
one end

Table 6-2: Rosemount troubleshooting for 1–5 Vdc output

Symptom Corrective actions

Transmitter voltage reading is zero Verify terminal voltage is 5.8 to 28.0 Vdc at

signal terminals

Check power wires for reversed polarity

Check that power wires are connected to signal
terminals

Check for open diode across test terminal

Transmitter not communicating with Field
Communicator

Transmitter voltage reading is low or high Verify applied pressure

Verify terminal voltage is 5.8 to 28.0 Vdc

Check loop resistance, 250 Ω minimum (PS
voltage -transmitter voltage/loop current)

Check that power wires are connected to signal
terminals and not test terminals

Verify clean DC Power to transmitter (Max AC
noise 0.2 volts peak to peak)

Verify the output is between 1–5 Vdc or
saturation levels

Have Field Communicator poll for all addresses

Verify 1–5 Vdc range points

Verify output is not in alarm condition

Perform analog trim

Check that power wires are connected to the
correct signal terminals (positive to positive,
negative to negative) and not the test terminal

Transmitter will not respond to changes in
applied pressure

98 Rosemount 2051 Pressure Transmitter

Check impulse piping or manifold for blockage

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Table 6-2: Rosemount troubleshooting for 1–5 Vdc output (continued)

Symptom Corrective actions

Verify applied pressure is between the 1–5 Vdc
points

Verify the output is not in alarm condition

Verify transmitter is not in loop test mode

Verify transmitter is not in multidrop mode

Check test equipment

Digital pressure variable reading is low or high Check impulse piping for blockage or low fill in

wet leg

Verify transmitter is calibrated properly

Check test equipment (verify accuracy)

Verify pressure calculations for application

Digital pressure variable reading is erratic Check application for faulty equipment in

pressure line

Voltage reading is erratic Verify power source to transmitter has adequate

6.5 Diagnostic messages

Listed in the below sections are detailed table of the possible messages that will appear on
either the LCD/LOI display, a Field Communicator, or an AMS Device Manager system. Use
the tables below to diagnose particular status messages.

• Good

• Failed – fix now

• Maintenance – fix soon

• Advisory

Verify transmitter is not reacting directly to
equipment turning on/off

Verify damping is set properly for application

voltage and current

Check for external electrical interference

Verify transmitter is properly grounded

Verify shield for twisted pair is only grounded at
one end

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Table 6-3: Status: Failed – Fix Now

Alert name LCD display

screen

No Pressure
Updates

Electronics
Board Failure

Critical Sensor
Data Error

Critical
Electronics
Data Error

Sensor Failure FAIL SENSOR FAIL

Incompatible
Electronics and
Sensor

NO P
UPDATE

FAIL
BOARD

MEMRY
ERROR

XMTR
MSMTCH

LOI screen Problem Recommended action

NO PRESS
UPDATE

FAIL
BOARD

MEMORY
ERROR

SENSOR

XMTR
MSMTCH

There are no pressure updates
from the sensor to the
electronics

A failure has been detected in
the electronics circuit board

A user written parameter does
not match the expected value

A user written parameter does
not match the expected value

A failure has been detected in
the pressure sensor

The pressure sensor is
incompatible with the
attached electronics

• Ensure the sensor cable connection

to the electronics is tight.

• Replace the transmitter.

• Replace the pressure transmitter.

• Confirm and correct all parameters

listed in Device Information.

• Perform a Device Reset.

• Replace Pressure Transmitter.

• Confirm and correct all parameters

listed in Device Information.

• Perform a Device Reset.

• Replace pressure transmitter.

• Replace pressure transmitter.

• Replace the pressure transmitter.

Table 6-4: Status: Maintenance – Fix Soon

Alert name LCD display

screen

No
Temperature
Updates

Pressure Out of
Limits

Sensor
Temperature
Beyond Limits

NO T
UPDATE

PRES
LIMITS

TEMP
LIMITS

LOI screen Problem Recommended action

NO TEMP
UPDATE

PRES OUT
LIMITS

TEMP OUT
LIMITS

There are no temperature
updates from the sensor to
the electronics

The pressure is either above or
below the sensor limits

The sensor temperature has
exceeded its safe operating
range

• Ensure the sensor cable connection

to the electronics is tight.

• Replace the pressure transmitter.

• Check the transmitter pressure

connection to ensure it is not
plugged or the isolating diaphragms
are not damaged.

• Replace the pressure transmitter.

• Check the process and ambient

conditions are within –85 to 194 °F
(–65 to 90 °C).

• Replace the pressure transmitter.

100 Rosemount 2051 Pressure Transmitter