Revision 1.0 SMV800 Modbus User's Guide Page 181
Correcting the Low Point or Lower Range Value (LRV) for Process
Temperature:
Calibrate using SMV Modbus application:
1. Connect power supply and RS485 connectors to the signal terminals of the
Transmitter’s terminal block.
2. Turn on the power supply, and allow the Transmitter to become stable.
3. Ensure that the Damping value for Process Temperature is set to 0 seconds while
performing calibration.
4. Launch SMV Modbus application, connect to the device and go to the PT
Calibration screen as show below. PT Calibration is available at Maintenance-
>Calibration and Correction Records->Process Temperature Calibration.
5. Adjust the temperature source to apply value equal to the Lower Calibration Point,
and when the temperature stabilizes, wait for 5 seconds and press ok
6. Click on “PT Low Point Calibration” button and follow the on-screen prompts
Calibrate manually by writing to Modbus registers:
1. Write the low point calibration value for which the correction is required to the
registers 1025-1026.
2. Write the date in the DDMMYY-- format in the calibration time and date register.
(Register address 125-126)
The date to be written as month and day followed by the year.
Year to be entered as year -1900.
For example, to enter calibration date as June 10
th
2018 write to register 125-126 as
0x0A067600
3. Adjust the temperature source to apply value equal to the Lower Calibration Point,
4. Write to single coil address 12 as ON
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