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
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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.
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Figure 1-1: Rosemount 751 Exploded View
A
BC
DE
FG
H
I
J
K
L
M
N
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
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Figure 1-2: Meter Exploded View
A
B
C
D
K
J
I
H
G
F
E
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
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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
C
3144P
+
−
751
+−
A B
C
2051
+−T
751
+
−
4–20 mA dc Input Signal for Rosemount
3144P
4–20 dc Input Signal for Rosemount 2051
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+−
A B
C
751
+
−
3051C
+−T
+−
AB
C
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.
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Figure 1-4: Rosemount 751 Parallel Wiring Diagrams
A
+-
B
C
-
+
T3144P
-+
751
A
+ -
BC
+-T2051
751
- +
4–20 mA dc Input Signal for Rosemount
3144P
4–20 dc Input Signal for Rosemount 2051
A
+-
BC
+-T
3051C
751
-+
+-
A
BC
+-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
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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
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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.
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10 Rosemount 751

2.1.5 Set the display equivalent to a 20 mA signal
Procedure
1. Press the right 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 9999.
Note
The sum of the 4 mA point and the span must not exceed 9999.
3. To store the information, simultaneously press both configuration
buttons for two seconds. The LCD display meter is now configured.
2.1.6 Replace the cover
Procedure
Make sure the rubber gasket is seated properly, and thread the transparent
housing cover onto the LCD display meter body.
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3 Product Certification
Rev 1.8
3.1 European Directive Information
A copy of the EU Declaration of Conformity can be found at the end of the
Quick Start Guide. The most recent revision of the EU Declaration of
Conformity can be found at Emerson.com/Rosemount.
3.2 Ordinary Location Certification
As standard, the transmitter has been examined and tested to determine that
the design meets the basic electrical, mechanical, and fire protection
requirements by a nationally recognized test laboratory (NRTL) as accredited
by the Federal Occupational Safety and Health Administration (OSHA).
3.3 North America
The US National Electrical Code® (NEC) and the Canadian Electrical Code (CEC)
permit the use of Division marked equipment in Zones and Zone marked
equipment in Divisions. The markings must be suitable for the area
classification, gas, and temperature class. This information is clearly defined in
the respective codes.
3.4 USA
3.4.1 E5 USA Explosion-proof
Certificate 0T2H8.AE
Standards FM Class 3600: 1989, FM Class 3615: 1989
Markings XP CL I, DIV 1, GP B, C, D; DIP CL II/III, DIV 1, GP E, F, G; -40 °C ≤
Ta ≤ +85 °C; Type 4X
3.4.2 I5 USA Intrinsically Safe; Nonincendive
Certificate 0T9H2AX
Standards FM Class 3600: 2011, FM Class 3610: 2010, FM Class 3611:
2004, FM Class 3810: 1989, NEMA-250: 1991, ANSI/ISA
60079-0: 2009, ANSI/ISA 60079-11: 2009
Markings IS CL I/II/III, DIV 1, GP A, B, C, D, E, F, G; T5; IS CL I, Zone 0, AEx
ia IIC T5; NI CL I, DIV 2, GP A, B, C, D T5; (-60 °C≤ T a ≤ +60 °C);
when installed per 00751-0074; Type 4X
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12 Rosemount 751

Special Conditions for Safe Use (X):
1. The apparatus enclosure contains aluminum and is considered to
constitute a potential risk of ignition by impact or friction. Care must
be taken into account during installation and use to prevent impact or
friction.
3.5 Canada
3.5.1 E6 Canada Explosionproof
Certificate 1718395
Standards CSA Std C22.2 No. 25-1966; CSA Std C22.2 No. 30-M1986;
CAN/CSA-C22.2 No. 94-M91; CSA Std C22.2 No. 142-M1987
Markings Explosionproof for CL I, DIV 1, GP C, D; CL II, DIV 1, GP E, F, G; CL
III; DIV 1; CL I DIV 2, GP A, B, C, D; Type 4X
3.5.2 I6 Canada Intrinsically Safe
Certificate 1718395
Standards CSA Std C22.2 No. 25-1966; CSA Std C22.2 No. 30-M1986;
CAN/CSA-C22.2 No. 94-M91; CSA Std C22.2 No. 142-M1987;
CAN/CSA-C22.2 No. 157-92; CSA Std C22.2 No. 213-M1987
Markings Intrinsically Safe for CL I DIV 1; when installed per 00751-0068;
Type 4X
3.6 Europe
3.6.1 E8 ATEX Flameproof
Certificate DEMKO 18 ATEX 1958X
Standards EN 60079-0:2012+A11:2013; EN 60079-1:201
Markings
II 2 G Ex db IIC T5/T6 Gb, T6(-40 °C ≤ Ta ≤ +40 °C), T5(-40
°C ≤ Ta ≤ +70 °C) Vmax = 60 Vdc; Imax = 50 mA; Pmax=1.5 W
Installation Instructions
1. Only use plugs, adapters, glands, or conduit with a compatible thread
form when closing conduit entries.
2. The 751 may be provided with a 3/4NPT to 1/2NPT thread adapter.
This thread adapter has not been assessed under DEMKO 18 ATEX
1958X. When installing this thread adapter, refer to manufacturer’s
installation instructions
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Special Conditions for Safe Use (X):
1. Flameproof joints are not intended for repair.
2. Painted enclosures may cause risk from electrostatic discharge. Avoid
installation that could cause electrostatic build-up on painted surfaces,
and only clean the painted surfaces with a damp cloth.
3.6.2 I8 ATEX Intrinsic Safety
Certificate Baseefa03ATEX0448X
Standards EN 60079-0:2012, EN 60079-11:2012
Markings
II 1 G Ex ia IIC T5/T6 Ga; T6(-60 °C ≤ Ta ≤ +40 °C), T5(-60
°C ≤ Ta ≤ +80 °C)
Special Conditions for Safe Use (X):
1. The enclosure may be made from aluminum alloy and given a
protective polyurethane or epoxy polyester paint finish; however, care
should be taken to protect it from impact or abrasion if located in a
zone 0 environment.
3.6.3 N1 ATEX Type n
Certificate Baseefa03ATEX0454
Standards EN 60079-0:2012; EN 60079-15:2010
Markings
II 3 G Ex nA IIC T6 Gc; (-40 °C ≤ Ta ≤ +70 °C)
3.7 International
3.7.1 E7 IECEx Flameproof
Certificate IECEx UL 18.0040X
Standards IEC 60079-0:2011; IEC 60079-1:2014-06
Markings Ex db IIC T5/T6 Gb, T6(-40 °C ≤ Ta ≤ +40 °C), T5(-40°C ≤ Ta ≤ +70
°C) Vmax= 60 Vdc; Imax= 50 mA; Pmax=1.5 W
Installation Instructions
1. Only use plugs, adapters, glands, or conduit with a compatible thread
form when closing conduit entries.
2. The 751 may be provided with a 3/4NPT to 1/2NPT thread adapter.
This thread adapter has not been assessed under IECEx UL 18.0040X.
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14 Rosemount 751

When installing this thread adapter, refer to manufacturer’s
installation instructions.
Special Conditions for Safe Use (X):
1. Flameproof joints are not intended for repair.
2. Painted enclosures may cause risk from electrostatic discharge. Avoid
installations that could cause electrostatic build-up on painted
surfaces, and only clean the painted surfaces with a damp cloth.
3.7.2 I7 IECEx Intrinsic Safety
Certificate IECEx BAS 11.0064X
Standards IEC 60079-0: 2011; IEC 60079-11: 2011
Markings Ex ia IIC T5/T6 Ga; T6(-60 °C ≤ Ta ≤ +40 °C), T5(-60 °C ≤ Ta ≤ +80
°C)
Special Conditions for Safe Use (X):
1. The enclosure may be made of aluminum alloy and given a protective
polyurethane or epoxy polyester paint finish; however, care should be
taken to protect it from impact or abrasion if located in a Zone 0
environment.
3.8 Brazil
3.8.1 E2 INMETRO Flameproof
Certificate UL-BR 16.0054X
Standards ABNT NBR IEC 60079-0:2008 + Errata 1:2011, ABNT NBR IEC
60079-1:2009 + Errata 1:2011
Markings Ex d IIC T5/T6 Gb; T6(-20 °C ≤ Ta ≤ +40 °C), T5(-20 °C ≤ Ta ≤ +70
°C)
Special Conditions for Safe Use (X):
1. The manufacturer should be contacted for information on the
dimensions of the flameproof joints.
3.8.2 I2 INMETRO Intrinsic Safety
Certificate UL-BR 15.1094X
Standards ABNT NBR IEC 60079-0:2008 + ERRATA 1:2011, ABNT NBR IEC
60079-11:2009
Markings Ex ia IIC T5/T6 Ga; T6(-60 °C ≤ Ta ≤ +40 °C), T5(-60 °C ≤ Ta ≤ +80
°C)
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Special Conditions for Safe Use (X):
1. The enclosure may be made of aluminum alloy and given a protective
polyurethane or epoxy polyester paint finish; however, care should be
taken to protect it from impact or abrasion if located in places where
EPL Ga is required.
3.9 China
3.9.1 E3 China Flameproof
Certificate GYJ12.1034X
Standards GB 3836.1-2010, GB 3836.2-2010
Markings Ex d IIC T6 Gb
Special Conditions for Safe Use (X):
1. Symbol “X” is used to denote specific conditions of use: Contact the
original manufacturer when repair work relates to the flamepath.
2. Ambient temperature range is: -20 °C ≤ Ta ≤ +60 °C.
3. The earth connection facility in the enclosure should be connected
reliably.
4. During installation, there should be no mixture harmful to flameproof
housing.
5. During installation in hazardous location. Cable glands, conduits and
blanking plugs, certified by state-appointed inspection bodies with Ex
d IIC Gb degree, should be used.
6. During installation, use and maintenance in explosive gas
atmospheres, observe the warning “Do not open when energized.”
7. End users is not permitted to change any components insides, but to
settle the problem in conjunction with manufacturer to avoid damage
to the product.
8. When installation, use and maintenance of this product, observe
following GB3836.13-1997 “Electrical apparatus for explosive gas
atmospheres Part 13: Repair and overhaul for apparatus used in
explosive gas atmospheres.” GB3836.15-2000 “Electrical apparatus
for explosive gas atmospheres Part 15: Electrical installations in
hazardous area (other than mines).” GB3836.16-2006 “Electrical
apparatus for explosive gas atmospheres Part 16: Inspection and
maintenance of electrical installation (other than mines).”
GB50257-1996 “Code for construction and acceptance of electric
device for explosion atmospheres and fire hazard electrical equipment
installation engineering.”
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16 Rosemount 751

3.10 EAC - Belarus, Kazakhstan, Russia
3.10.1 EM Technical Regulation Customs Union TR CU 012/2011 (EAC)
Flameproof
Certificate RU C-US.GB05.B.00285
Markings 1Ex db IIC T6…T5 Gb X; T5 (-40 °C ≤ Ta ≤ +70 °C); T6 (-40 °C ≤ Ta
≤ +40 °C); See certificate for Special Conditions for Safe Use.
3.10.2 IM Technical Regulation Customs Union TR CU 012/2011 (EAC)
Intrinsic Safety
Certificate RU C-US.GB05.B.00285
Markings 0Ex ia IIC T6…T5 Ga X; T5 (-60 °C ≤ Ta ≤ +80 °C); T6 (-60 °C ≤ Ta ≤
+40 °C); See certificate for Special Conditions for Safe Use
3.11 Combinations
K2 Combination of E2 and I2
K5 Combination of E5 and I5
C6 Combination of E6 and I6
KM Combination of EM and IM
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4 Declaration of Conformity
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18 Rosemount 751

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20 Rosemount 751