41
Reference Manual
00809-0100-4853, Rev AB
Operation and Maintenance
January 2017
Operation and Maintenance
4.3.8
Process temperature sensor calibration
The Temperature Calibration allows the user to perform a sensor trim of a process temperature sensor.
Process temperature sensor calibration units can be set in the Sensor Transducer Block.
Process temperature trim
Note
When performing a sensor trim on a sensor, it is possible to degrade the performance of the sensor if
inaccurate calibration equipment is used. Use calibration equipment that is at least three times as
accurate as the sensor of the Rosemount 3051SMV Transmitter.
To calibrate the Process Temperature Input using the sensor trim, use the following procedure.
1. Set up a Temperature Calibrator to simulate a Pt 100 (100-ohm platinum, alpha 385 RTD) per
manufacture recommendations. See
“Install optional process temperature input (Pt 100 RTD
for wiring information.
2. Select
Actions > Methods > Methods > Trim Process Temperature
and select the type of calibration.
Adjust the calibrator/RTD simulator to a test point temperature value that represents a minimum
process temperature (for example, 32 °F or 0 °C) if completing a lower sensor trim. Adjust the
calibrator/RTD simulator to a test point temperature value that represents the maximum process
temperature (for example, 140 °F or 60 °C) if completing an upper sensor trim.
4.4
Field upgrades and replacements
4.4.1
Disassembly considerations
During disassembly, do not remove the instrument cover in explosive atmospheres when the circuit is
live as this may result in serious injury or death. Also, be aware of the following:
Follow all plant safety rules and procedures.
Isolate and vent the process from the transmitter before removing the transmitter from service.
Disconnect optional process temperature sensor leads and cable.
Remove all other electrical leads and conduit.
Detach the process flange by removing the four flange bolts and two alignment screws that secure it.
Do not scratch, puncture, or depress the isolating diaphragms.
Clean isolating diaphragms with a soft rag and a mild cleaning solution, then rinse with clear water.
Whenever the process flange or flange adapters are removed, visually inspect the PTFE O-rings.
Emerson recommends reusing O-rings if possible. If the O-rings show any signs of damage, such as
nicks or cuts, they should be replaced.
4.4.2
Housing assembly including electronics board
Field device labels
The sensor module label reflects the replacement model code for reordering a complete transmitter.
Replacement model codes are also viewable in the host by selecting
Overview > Device Information >
Identification
.
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