Emerson Rosemount 848T, Reference Manual, Page: 59 / 136

51
Reference Manual
00809-0100-4697, Rev GA
Section 3: Configuration
November 2014
Configuration
Sensor calibration in the sensor transducer block
If the F
OUNDATION
fieldbus configuration tool or host system does not support the use of DD
methods for device configuration, the following steps illustrate how to calibrate the sensor from
the sensor transducer block.
Note
Active calibrators should not be used in conduction with RTDs on any multiple input
temperature transmitter such as the 848T.
1. Under SENSOR_CALIB, the SENSOR_NUMBER to the number of the sensor to calibrate.
2. Set CALIB_UNIT to calibration unit.
3. Set CALIB_METHOD to User Trim (see Table on page 41 for valid values).
4. Set the input value of the sensor simulator to be within the range defined by
CALIB_LO_LIMIT and CALIB_HI_LIMIT.
5. Set CALIB_POINT_LO (CALIB_POINT_HI) to the value set at the sensor simulator.
6. Read CALIB_STATUS and wait until it reads “Command Done”
7. Repeat steps 3 to 5 if performing a two-point trim. Note that the difference in values
between CALIB_POINT_LO and CALIB_POINT_HI must be greater than
CALIB_MIN_SPAN.