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Reference Manual
00809-0400-4728, Rev AA
June 2011
Rosemount 644
3-18
Sensor Transducer Block Sensor Calibration, Lower and Upper Trim Methods
In order to calibrate the transmitter, run the Lower and Upper Trim Methods. If
your system does not support methods, manually configure the Transducer
Block parameters listed below.
1. Set MODE_BLK.TARGET to OOS.
2. Set SENSOR_CAL_METHOD to User Trim.
3. Set CAL_UNIT to supported engineering units in the
Transducer Block.
4. Apply temperature that corresponds to the lower calibration point and
allow the temperature to stabilize. The temperature must be
between the range limits defined in PRIMRY_VALUE_RANGE.
5. Set values of CAL_POINT_LO to correspond to the temperature
applied by the sensor.
6. Apply temperature, temperature corresponding to the upper
calibration.
7. Allow temperature to stabilize.
8. Set CAL_POINT_HI.
NOTE
CAL_POINT_HI must be within PRIMARY_VALUE_RANGE and greater than
CAL_POINT_LO + CAL_MIN_SPAN
9. Set SENSOR_CAL_DATE to the current date.
10. Set SENSOR_CAL_WHO to the person responsible for the
calibration.
11. Set SENSOR _CAL_LOC to the calibration location.
12. Set MODE_BLK.TARGET to AUTO.
NOTE
If trim fails, the transmitter will automatically revert to factory trim.
Excessive correction or sensor failure could cause device status to read
“calibration error.” To clear this, trim the transmitter.