5 Service and maintenance
266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB | 59
Calibrating
Calibration of the transmitter is performed using the on-board HMI and the user’s calibration equipment. Once calibrated by the
user, this field calibration can be saved in the transmitter's protected memory. The user can toggle between the original factory
calibration and the user-saved calibration performed at the site.
IMPORTANT NOTES: Prior to calibration, it is very important to ensure the system is leak-free or errors will be
introduced into the readings. Follow the instructions in section 4.3.2, Leak-testing manifold connections.
It is also recommended to use the Easy Setup menu to set the Units, LRV (Lower Range Value), and URV
(Upper Range Value) for Differential Pressure, Static Pressure, and Temperature to match the calibration
equipment.
The Calibration menu selections (Table 14) are used to calibrate the main pressure sensors (differential and static) and process
temperature. In this menu, the user may save the calibration (Save to User), revert to the factory calibration (Reset to Factory)
or revert to the user saved calibration (Reset to User) for individual sensors or for the entire calibration. For more details
concerning calibration, go to section 5.12.8, Additional calibration menu commands.
Table 14: Calibration menu
Stores DP sensor settings in the
transmitter's nonvolatile memory
Reverts to the last Save to User DP
settings
Reverts to DP sensor settings as
shipped from the factory
Stores SP sensor settings in the
transmitter's nonvolatile memory.
Reverts to the last Save to User SP
settings.
Reverts to SP sensor settings as
shipped from the factory.
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