Quick Start Guide
00825-0100-4378, Rev CB
September 2020
Rosemount™ 751 Field Signal Indicator
Quick Start Guide September 2020
About this guide
This guide provides basic guidelines for Rosemount 751 Field Signal 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.
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.
Contents
Installation................................................................................................................................... 3
Configuration...............................................................................................................................8
Product Certification.................................................................................................................. 11
Declaration of Conformity..........................................................................................................17
China RoHS................................................................................................................................ 20
2 Rosemount 751
September 2020 Quick Start Guide
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 liquid crytal
display (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.
Quick Start Guide 3
A
B
C
D
E
F
G
H
I
J
K
L
M
N
Quick Start Guide September 2020
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
4 Rosemount 751
A
B
C
D
K
J
I
H
G
F
E
September 2020 Quick Start Guide
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
Quick Start Guide 5
+
−
A B
C
3144P
+
−
751
+
−
A B
C
2051
+−T
751
+
−
+
−
A B
C
751
+
−
3051C
+−T
+
−
A
B
C
751
+
−
3051S +
−
T
Quick Start Guide September 2020
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 indicator 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 device from the series configuration will
disrupt the loop.
Figure 1-3: Rosemount 751 Series Wiring Diagrams
4–20 mA dc Input Signal for Rosemount
3144P
4–20 mA dc Input Signal for Rosemount
6 Rosemount 751
A. Power supply
B. Load resistor
C. Optional ground
3051C
4–20 dc Input Signal for Rosemount
2051
4–20 dc Input Signal for Rosemount
3051S
A
+
B
C
-
+
T
3144P
-
+
751
A
+
B
C
+
-
T
2051
751
- +
A
+
B
C
+-T
3051C
751
-
+
+
-
A
B
C
+
-
T 3051S
- +
751
September 2020 Quick Start Guide
It is recommended that the device 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 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 indicator without
affecting the integrity of the 4-20 mA loop. Additionally, spare indicators can
be added without disrupting the loop.
Figure 1-4: Rosemount 751 Parallel Wiring Diagrams
4–20 mA dc Input Signal for Rosemount
3144P
4–20 mA dc Input Signal for Rosemount
3051C
4–20 dc Input Signal for Rosemount
2051
4–20 dc Input Signal for Rosemount
3051S
A. Power supply
B. Load resistor
Quick Start Guide 7
C. Optional ground
Quick Start Guide September 2020
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 (see
Table 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
L in Linear
LinF Linear with 5-second filter
8 Rosemount 751
and Digital Display
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