Emerson Rosemount 751 User manual

Quick Start Guide

00825-0100-4378, Rev AE

February 2019

Rosemount™ 751 Field Signal Indicator

About this guide

This guide provides basic guidelines for Rosemount 751 Remote Indicator. It does not provide

instructions for configuration, diagnostics, maintenance, service, troubleshooting, Explosionproof,

Flameproof, or intrinsically safe (I.S.) installations. Refer to the Rosemount 751 Reference Manual for

more instruction. This manual is also available electronically on Emerson.com/Rosemount.

WARNING

Explosions could result in death or serious injury.

•Installation of this indicator in an explosive environment must be in accordance with the

appropriate local, national, and international standards, codes, and practices. Review the Product

Certifications section for any restrictions associated with a safe installation.

•In an explosion-proof/flameproof installation, do not remove the indicator cover when power is

applied to the unit.

Electrical shock could cause death or serious injury.

•Avoid contact with the leads and terminals. High voltage that may be present on leads can cause

electrical shock.

Contents

Installation.....................................................3

Configuration.................................................9

Product Certification....................................12

Declaration of Conformity............................18

China RoHS.................................................. 21

Quick Start Guide February 2019

2 Rosemount 751

1 Installation

1.1 Assembly

The Rosemount 751 Field Signal Indicator is comprised of the components

shown in Figure 1-1. The housing may contain an analog or LCD display meter.

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 1-1.

The meter subassembly contains the components shown in Figure 1-2.

February 2019 Quick Start Guide

Quick Start Guide 3

Figure 1-1: 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-in. Pipe

I. Housing

J. Optional ¾ to ½-in. Conduit Reducing bushing (if required)

K. Meter

L. Bushing

M. Foam Spacer

N. Housing Cover

Quick Start Guide February 2019

4 Rosemount 751

Figure 1-2: Meter Exploded View

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

February 2019 Quick Start Guide

Quick Start Guide 5

1.2 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 Rosemount 751 indicator be wired in a series

configuration when the 4-20 mA transmitter does not contain a test terminal.

The Rosemount 751 is designed so the analog or LCD display meter can be

removed from the housing without impacting the integrity of the 4-20 mA

loop. Removal of the entire Rosemount 751 device from the series

configuration will disrupt the loop.

Figure 1-3: Rosemount 751 Series Wiring Diagrams

+−

A B

3144P

−

751

+−

A B

2051

+−T

751

−

4–20 mA dc Input Signal for Rosemount

3144P

4–20 dc Input Signal for Rosemount 2051

Quick Start Guide February 2019

6 Rosemount 751

+−

A B

751

−

3051C

+−T

+−

751

−

3051S + −T

4–20 mA dc Input Signal for Rosemount

3051C

4–20 dc Input Signal for Rosemount

3051S

A. Power supply

B. Load resistor

C. Optional ground

It is recommended that the Rosemount 751 indicator be wired in a parallel

configuration when the 4-20 mA transmitter includes a test terminal.

Utilization of the test terminal is required in a parallel configuration.

Connecting the 751 indicator across the positive and negative terminals of

the 4-20 mA transmitter could impact the loop.

A parallel configuration will allow the removal of the 751 indicator without

affecting the integrity of the 4-20 mA loop. Additionally, spare 751 indicators

can be added without disrupting the loop.

February 2019 Quick Start Guide

Quick Start Guide 7

Figure 1-4: Rosemount 751 Parallel Wiring Diagrams

T3144P

751

+ -

+-T2051

751

- +

4–20 mA dc Input Signal for Rosemount

3144P

4–20 dc Input Signal for Rosemount 2051

+-T

3051C

751

+-T 3051S

- +

751

4–20 mA dc Input Signal for Rosemount

3051C

4–20 dc Input Signal for Rosemount

3051S

A. Power supply

B. Load resistor

C. Optional ground

Quick Start Guide February 2019

8 Rosemount 751

2 Configuration

2.1 LCD display configuration

The 20-segment bar graph is factory calibrated and represents 4–20 mA

directly, but the end points of the LCD display are user-definable. The meter

requires a current between 4 and 20 mA in order to be scaled, but the actual

value of the current is not significant.

2.1.1 Remove the cover

WARNING

Explosions could result in death or serious injury.Do not remove the

transmitter cover in explosive atmospheres when the circuit is live.

Procedure

Unscrew and remove the transparent housing cover from the LCD display

body.

2.1.2 Position the decimal point and select the meter function

Procedure

1. Press the left and right configuration buttons simultaneously and

release them immediately.

2. To move the decimal point to the desired location, press the left

configuration button.

Note

The decimal point wraps around.

3. To scroll through the mode options, press the right configuration

button repeatedly until the meter displays the desired mode (SeeTable

2-1).

Note

The LCD display time-out is approximately 16 seconds. If you do not

press the configuration buttons within 16 seconds, the indicator will

revert to reading the current signal.

Table 2-1: LCD Display Mode Options

Options Relationship between Input Signal

and Digital Display

L in Linear

LinF Linear with five-second filter

February 2019 Quick Start Guide

Quick Start Guide 9

Table 2-1: LCD Display Mode Options (continued)

Options Relationship between Input Signal

and Digital Display

Srt Square root

SrtF Square root with five-second filter

Square root function only relates to the digital display. The bar graph output

remains

linear with the current signal.

Square root response

The digital display will be proportional to the square root of the input current

where 4 mA = 0 and 20 mA = 1.0, scaled per the calibration procedure. The

transition point from linear to square root is at 25 percent of full scale flow.

Filter response operates upon “present input” and “input received in the

previous five

second interval” in the following manner:

Display = (0.75 previous input) + (0.25 present input)

This relationship is maintained provided that the previous reading minus the

present

reading is less than 25 percent of full scale.

2.1.3 Store the information

Procedure

Press both configuration buttons simultaneously for two seconds.

Note

The meter displays “- -” for approximately 7.5 seconds while the information

is being stored.

2.1.4 Set the display equivalent to a 4 mA signal

Procedure

1. Press the left configuration button for two seconds.

2. To decrease the display numbers, press the left configuration button.

To increase the numbers, press the right configuration button. Set the

numbers between –999 and 1000.

3. To store the information, simultaneously press both configuration

buttons for two seconds.

Quick Start Guide February 2019

10 Rosemount 751

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