Rosemount 751 Operating Manual

Rosemount 751 Field Signal Indicator

Reference Manual

00809-0100-4378, Rev CE

February 2014

Reference Manual

NOTICE

00809-0100-4378, Rev CE

Rosemount 751 Field Signal Indicator

Title Page

February 2014

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

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

Technical support, quoting, and order-related questions.
1-800-999-9307 (7:00 am to 7:00 pm CST)
North American Response Center

Equipment service needs.
1-800-654-7768 (24 hours—includes Canada)
Outside of the United States, contact your local Emerson Process Management

representative.

The products described in this document are NOT designed for nuclear-qualified
applications. Using non-nuclear qualified products in applications that require
nuclear-qualified hardware or products may cause inaccurate readings.

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

1

Reference Manual

00809-0100-4378, Rev CE

1Section 1: Introduction

2Section 2: Installation

Table of Contents

February 2014

1.1 LCD display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.2 Analog meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1.3 Service support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.4 Product recycling/disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

2.3 LCD display configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.3.1 Remove the cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

2.3.2 Position the decimal point and select the meter function . . . . . . . . . . . . .11

2.3.3 Store the information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

2.3.4 Set the display equivalent to a 4 mA signal . . . . . . . . . . . . . . . . . . . . . . . . . .12

2.3.5 Set the display equivalent to a 20 mA signal . . . . . . . . . . . . . . . . . . . . . . . . .12

2.3.6 Replace the cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

AAppendix A: Reference data

A.1 Housing specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

A.1.1 Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

A.2 LCD display specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

A.2.1 Functional specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

A.2.2 Performance specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

A.2.3 Physical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

A.3 Analog meter specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

A.3.1 Functional specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

A.3.2 Performance specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

A.3.3 Physical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

A.4 Dimensional drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

A.5 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

BAppendix B: Product Certifications

B.1 European directive information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

B.2 Ordinary location certification for FM approvals . . . . . . . . . . . . . . . . . . . . . . . . . . .21

B.2.1 North America . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

B.2.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Europe22

Table of Contents

B.2.3 International . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

CAppendix C: Approval drawings

C.1 Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

1

Reference Manual

00809-0100-4378, Rev CE

Section 1 Introduction

LCD display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3

Analog meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4

Service support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

Product recycling/disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5

The Rosemount 751 Field Signal Indicators provide a means of displaying important process
variables. These devices operate with any two-wire transmitter that measures input variables
such as pressure, flow, liquid level, or temperature. Rosemount indicators are ideal for
installations where an integral meter would be difficult to view.

Rosemount 751 Indicators are designed for use in industrial environments where all-weather
performance is necessary. These units are vibration- and corrosion-resistant, and explo­sion-proof or intrinsically safe. An LCD display or analog meter may be ordered to meet specific
application requirements.

Section 1: Introduction

February 2014

1.1 LCD display

The LCD display requires an analog 4–20 mA dc output from a two-wire transmitter. It may be
configured from a 4 mA point of –999 to 1000 and a 20 mA point of -999 to 9999. The sum of
the 4 mA point and the span must not exceed 9999. The decimal point can be placed in any of
three positions (X.X.X.X) or not used. Calibration adjustments are made using noninteractive
zero and span buttons. The scaled meter may be labelled with the appropriate engineering
units. A twenty-segment bar graph, on the bottom of the meter faceplate, represents the 4–20
mA signal directly.

The large 2

Figure 1-1. The 4 and 20 mA points may be changed by pressing the buttons on the meter

faceplate. The meter can be rotated in 90-degree increments within the enclosure for
convenient viewing.

Figure 1-1. LCD display

1

/4-inch meter face has 1/2-inch-high characters for easy readability as shown in

LCD display

Introduction

3

Section 1: Introduction

PERCENT

0

20

40

60

80

100

February 2014

1.2 Analog meter

The analog meter requires an analog 4–20 mA dc, 10–50 mA dc, or 40–200 mV dc transmitter
output from a two-wire transmitter. Several meter calibration options are available to suit the
requirements of a particular application. Linear 0 to 100 percent meter scaling is adequate for
the majority of applications. A logarithmic 0 to 100 percent scale is available for use with flow
transmitters. As an option, the user can specify special meter scaling for direct readout in psi,
gph, °F, °C, or other convenient engineering units.

Reference Manual

00809-0100-4378, Rev CE

The large 2

1

/4-inch diameter meter face has a two-inch long scale for easy readability as shown in

Figure 1-2. A meter-zero adjustment is located on the meter faceplate. The meter can be

rotated in 90° increments within the enclosure for convenient viewing.

Figure 1-2. Analog Meter

Analog Meter Face

4

Introduction

Reference Manual

00809-0100-4378, Rev CE

1.3 Service support

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

Within the United States, call the Emerson Process Management Instrument and Valves
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.

Individuals who handle products exposed to a hazardous substance can avoid injury if they
are informed of and understand the hazard. If the product being returned was exposed to a
hazardous substance as defined by OSHA, a copy of the required Material Safety Data Sheet
(MSDS) for each hazardous substance identified must be included with the returned goods.

Section 1: Introduction

February 2014

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

1.4 Product recycling/disposal

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

Introduction

5

Reference Manual

A

B

C

D

E

F

G

H

I

J

K

L

M

N

00809-0100-4378, Rev CE

Section 2 Installation

Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 7

Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 9

LCD display configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 11

2.1 Assembly

The Rosemount 751 Field Signal Indicator is comprised of the components shown in Figure 2-1.
The housing may contain an analog or LCD display. Both meters are independent of component
parts and are completely interchangeable. Both meters plug into the terminal screws on the
housing, as shown in Figure 2-1.

The meter subassembly contains the components shown in Figure 2-2.

Section 2: Installation

February 2014

Figure 2-1. Rosemount 751 Exploded View

A. Terminal Screws
B. Housing O-Ring
C. Field Wiring Terminals
D. Loop Protection Diode
E. Tapped Mounting Boss
F. Optional Mounting Bracket
G. Mounting Bolt with Washer

H. U-Bolt for 2-inch Pipe
I. Housing
J. Optional ¾ to ½-inch Conduit Reducing Bushing (if required)
K. Meter
L. Bushing
M. Foam Spacer
N. Housing Cover

7Installation

Section 2: Installation

A

B

C

D

K

J

I

H

G

F

E

February 2014

Figure 2-2. LCD display exploded view

Reference Manual

00809-0100-4378, Rev CE

A. Retaining Straps
B. Mounting Screw into Housing

C. Washer for Retaining Strap
D. Mounting Screws into Mounting Plate
E. Terminal Screws (2)
F. Mounting Plate
G. Spacer Plate
H. LCD Display
I. Bushing
J. Foam Spacer
K. Configuration Buttons

8

Installation

Reference Manual

Power Supply

Power Supply

751

4–20 dc Input Signal for

Rosemount 2051

4–20 mA dc Input Signal for

Rosemount 3144P

+

+

–

–

Optional Ground

Load Resistor

T

2051

+

–

+

–

3144P

Optional Ground

Load Resistor

–

+

T

751

+

–

Power Supply

Power Supply

4–20 dc Input Signal for

Rosemount 3051S

4–20 mA dc Input Signal for

Rosemount 3051C

+

+

–

–

Optional Ground

Load Resistor

T

3051C

751

+

–

+

+

–

–

Optional Ground

Load Resistor

T

3051S

751

+

–

00809-0100-4378, Rev CE

2.2 Wiring diagrams

Use the following wiring diagrams to wire the Rosemount 751 Field Signal Indicator, in series or
in parallel, with Rosemount transmitters. Use shielded cable for best results in electrically noisy
environments.

It is recommended that the 751 indicator be wired in a series configuration when the 4-20 mA
transmitter does not contain a test terminal. The 751 is designed so the analog or LCD display
can be removed from the housing without impacting the integrity of the 4-20 mA loop.
Removal of the entire 751 device from the series configuration will disrupt the loop.

Figure 2-3. Rosemount 751 Series Wiring Diagrams

Series Wiring Diagrams for Rosemount 3144P Temperature

transmitters and Rosemount 2051, 3051C, or 3051S Pressure

Section 2: Installation

February 2014

Tra ns mitt er s

Installation

9