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Reference Manual
00809-0100-4021, Rev DA
November 2004
4-21
Rosemount 3144P
FOUNDATION Fieldbus
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_X to OOS
2. Set SENSOR_CAL_METHOD_X to User Trim
3. Set CAL_UNIT_X 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_X.
5. Set values of CAL_POINT_LO_X 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_X
NOTE
CAL_POINT_HI_X must be within PRIMARY_VALUE_RANGE_X and greater
than CAL_POINT_LO_X + CAL_MIN_SPAN_X.
9. Set SENSOR_CAL_DATE_X to the current date.
10. Set SENSOR_CAL_WHO_X to the person responsible for the
calibration.
11. Set SENSOR _CAL_LOC_X to the calibration location.
12. Set MODE_BLK.TARGET_X 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
Recall Factory Trim
To recall a factory trim on the transmitter, run the Recall Factory Trim. If your
system does not support methods, manually configure the Transducer Block
parameters listed below.
1. Set MODE_BLK.TARGET_X to OOS
2. Set SENSOR_CAL_METHOD_X to Factory Trim.
3. Set SET_FACTORY_TRIM_X to Recall.
4. Set SENSOR_CAL_DATE_X to the current date.
5. Set SENSOR_CAL_WHO_X to the person responsible for the
calibration.
6. Set SENSOR _CAL_LOC_X to the calibration location.
7. Set MODE_BLK.TARGET_X to AUTO.
NOTE
When changing the sensor type, the transmitter reverts to the factory trim and
any other trim performed on the transmitter is lost.