Page 1
Quick Installation Guide
Step 1: Mount the Transmitter
Step 2: Connect Wiring and Power Up
Step 3: Configure the Transmitter
Step 4: Trim the Transmitter
Product Certifications
Star t
Bench Calibration
Yes
No
Configure/Verify
End
00825-0100-4362, Rev CA
June 2007
Rosemount 951
Rosemount 951 Dry Gas Pressure Transmitter
www.rosemount.com
¢00825-0100-4809[¤
Page 2
Quick Installation Guide
IMPORTANT NOTICE
WAR NI NG
Rosemount Inc.
8200 Market Boulevard
Chanhassen, MN USA 55317
T (US) (800) 999-9307
T (Intnl) (952) 906-8888
Fax (952) 949-7001
Emerson Process
Management
Argelsrieder Feld 3
82234 Wessling
Germany
Tel 49 (8153) 9390
Fax 49 (8153) 939172
Emerson Process
Management Asia Pacific
Private Limited
1 Pandan Crescent
Singapore 128461
T (665) 777 8211
F (665) 777 0947/665 777 0743
00825-0100-4362, Rev CA
Rosemount 951
Rosemount and the Rosemount logotype are a registered trademarks of Rosemount Inc.
This installation guide provides basic guidelines for Rosemount® 951 transmitters. It does
not provide detailed instructions for configuration, diagnostics, maintenance, service, or
troubleshooting. For more information, Rosemount Inc. has two toll-free assistance
numbers:
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 8211
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 Process Management
representative.
June 2007
Life Support Policy
Emerson Process Management warrants the Rosemount 951 Pressure Transmitter will
perform according to its published specifications. This device is not recommended for use
as a critical component in a life support device or system. A critical component is any
component of a life support device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or system, or to affect its safety or
effectiveness.
Electrostatic Discharge (ESD)
Electrostatic discharge to the wiring terminals may cause permanent damage to the
device. Always use proper ESD procedures during installation and maintenance.
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Quick Installation Guide
STEP 1: MOUNT THE TRANSMITTER
Power ±signal
4-20 mA Connection
Process Connections
1
/8 inch NPT fitting *
H = High Pressure
* or factory installed adaptors
L = Low Pressure
Note: Screws
provided by installer
depending on surface.
00825-0100-4362, Rev CA
June 2007
Rosemount 951
SERVICE/APPLICATION
Differential pressure measurement of non-corrosive, non-combustible, non-condensing,
clean, dry gas only. Intended for indoor, climate controlled ambient environments.
NOTE
Remove the device from humidity resistant packaging in climate-controlled, indoor
environment only.
Mounting Considerations
• Restrain
• Process connections should be mounted horizontally or vertically for best performance.
• Maximum pressure may be limited by user-supplied connection fittings or adaptors.
Figure 1. Rosemount 951 Transmitter
5
/8 Hex when torquing process adaptors or connections.
Figure 2. Rosemount 951 Transmitter with Optional Flush Mount Bracket
3
Page 4
Rosemount 951
Note: Screws provided by
installer depending on
surface.
Note: Screws
provided by installer
depending on surface.
Figure 3. Rosemount 951 Transmitter with Optional Panel Mount Bracket
Figure 4. Rosemount 951 Transmitter with Optional Side Mount Bracket
Quick Installation Guide
00825-0100-4362, Rev CA
June 2007
4
Page 5
Quick Installation Guide
STEP 2: CONNECT WIRING AND POWER UP
Power
Supply
RL ≥ 250 Ω
Rosemount
951
HART
Communicator
+
-
H
L
Voltage (V dc)
Communication requires a minimum loop resistance of 250 ohms.
Max. Loop Resistance = 43.5 ⫻ (Power Supply Voltage – 10.5)
Operating Region
Load (Ohms)
1388
1000
500
0
10.5
20
30
40
36
1109
00825-0100-4362, Rev CA
June 2007
1. Use proper Electrostatic Discharge (ESD) procedures when connecting wiring to the
device.
2. Connect the positive lead to the "+" terminal, and the negative lead to the "–" terminal.
NOTE
Twisted pairs yield best results; shielded signal wiring is not necessary. Use 24 AWG or
larger wire and do not exceed 5,000 feet (1,500 meters).
Figure 5 shows the wiring connections necessary to power a Rosemount 951 and enable
communications with a hand-held HART communicator.
Figure 5. Rosemount 951 Wiring
Rosemount 951
Power Supply
The dc power supply should provide power with less than two percent ripple. The total
resistance load is the sum of the resistance of the signal leads and the load resistance of the
controller, indicator, and related pieces.
Figure 6. Power Supply Load Limitations, 4–20 mA Transmitters
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Quick Installation Guide
STEP 3: CONFIGURE THE TRANSMITTER
STEP 4: TRIM THE TRANSMITTER
00825-0100-4362, Rev CA
Rosemount 951
A check (⻫) indicates the basic configuration parameters. At minimum, these parameters
should be verified as part of the configuration and startup procedure if a HART
Communicator is used.
Function HART Fast Key Sequence
Alarm Level Config. 1, 4, 2, 7, 6
Alarm and Saturation Levels 1, 4, 2, 7
Analog Output Alarm Direction 1, 4, 2, 7, 1
Analog Output Trim 1, 2, 3, 2
Burst Mode On/Off 1, 4, 3, 3, 3
Burst Options 1, 4, 3, 3, 4
⻫ Damping 1, 3, 6
Date 1, 3, 4, 1
Descriptor 1, 3, 4, 2
Digital To Analog Trim (4-20 mA Output) 1, 2, 3, 2, 1
Field Device Information 1, 4, 4, 1
Loop Test 1, 2, 2
Lower Sensor Trim 1, 2, 3, 3, 2
Message 1, 3, 4, 3
Number of Requested Preambles 1, 4, 3, 3, 2
Poll Address 1, 4, 3, 3, 1
Poll a Multidropped Transmitter Left Arrow, 4, 1, 1
Rerange- Keypad Input 1, 2, 3, 1, 1
Saturation Level Config. 1, 4, 2, 7, 7
Scaled D/A Trim (4–20 mA Output) 1, 2, 3, 2, 2
Self Test (Transmitter) 1, 2, 1, 1
Sensor Information 1, 4, 4, 2
Sensor Temperature 1, 1, 4
Sensor Trim 1, 2, 3, 3
Sensor Trim Points 1, 2, 3, 3, 5
Stat us 1, 2, 1, 2
⻫ Tag 1, 3, 1
⻫ Transfer Function (Setting Output Type) 1, 3, 5
⻫ Units (Process Variable) 1, 3, 2
Upper Sensor Trim 1, 2, 3, 3, 3
Zero Trim 1, 2, 3, 3, 1
June 2007
NOTE
Transmitters are shipped from Rosemount Inc. fully calibrated per request or by the factory
default of full scale (span = upper range limit.)
Zero Trim
A zero trim is a single-point adjustment used for compensating mounting position. When
performing a zero trim, ensure that the equalizing valve is open (if present).
If zero offset is less than 3% of true zero, follow the “Using the 275/375 HART
Communicator” instructions below to perform a zero trim. If zero offset is greater than 3% of
true zero, follow the “Local Re-ranging and Trim” instructions below to rerange.
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Quick Installation Guide
00825-0100-4362, Rev CA
June 2007
Rosemount 951
Using the 275/375 HART Communicator
HART Fast Keys Steps
1, 2, 3, 3, 1
1. Equalize or vent the transmitter and connect HART communicator.
2. At the menu, input the HART Fast Key sequence.
3. Follow the commands to perform a zero trim.
Local Re-ranging and Trim
Both 4 and 20 mA points can be adjusted at the transmitter to a desired zero and full scale
using the adjustment key or LCD adjustment buttons while powered.
Caution: Make sure no high voltage is present.
NOTE
More comprehensive adjustment is possible with a HART Communicator.
Zero - 4 mA point
Without an LCD display
1. Using an appropriate quality pressure source, apply a pressure equivalent to the desired
lower range value to the transmitter. If zero, make sure the High (H) and Low (L)
pressure ports are at the same pressure.
2. Touch the key to the terminals, as shown in Figure 7, for at least two seconds but no
longer than ten seconds.
With an LCD display
1. Using an appropriate quality pressure source, apply a pressure equivalent to the desired
lower range value to the transmitter. If zero, make sure the High (H) and Low (L)
pressure ports are at the same pressure.
2. Push and hold the zero LCD adjustment button for at least two seconds but no longer
than ten seconds.
Figure 7. Zero 4 mA
7
Page 8
Quick Installation Guide
PRODUCT CERTIFICATIONS
00825-0100-4362, Rev CA
Rosemount 951
Span - 20 mA point
Without an LCD display
1. Using an appropriate quality pressure source, apply a pressure equivalent to the desired
upper range value.
2. Touch the key to the terminals, as shown in Figure 8, for at least two seconds but no
longer than ten seconds.
With an LCD display
1. Using an appropriate quality pressure source, apply a pressure equivalent to the desired
upper range value.
2. Push and hold the span LCD adjustment button for at least two seconds but no longer
than ten seconds.
NOTE
The Span is maintained when the 4 mA point is set. The span changes only when the 20 mA
point is set. Changing the span should not be required as a result of installation.
Figure 8. Span 20 mA
June 2007
Approved Manufacturing Locations
Rosemount Inc. — Chanhassen, Minnesota USA
European Directive Information
The EC declaration of conformity for all applicable European directives for this product can be
found on the Rosemount website at www.rosemount.com. A hard copy may be obtained by
contacting an Emerson Process Management representative.
Ordinary Location Certification for Factory Mutual
As standard, the transmitter has been examined and tested to determine that the design meets
basic electrical, mechanical, and fire protection requirements by FM, a nationally recognized
testing laboratory (NRTL) as accredited by the Federal Occupational Safety and Health
Administration (OSHA).
8
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