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Reference Manual
00809-0100-4697, Rev EA
October 2011
3-23
Rosemount 848T
Table 3-20. Validation Config
Sub-Parameter Structure
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.
Validation Value Sub-Parameter
Structure
Parameter Description
VALIDATION_MODE
Activates the measurement validation data gathering
process
0 = Disable
1 = Enable
SAMPLE_RATE
Number of seconds per sample used for measurement
validation data collection. This shouldn't exceed 10 seconds
per sample, but currently there are no upper limits.
DEVIATION_LIMIT
Sets the limit for the deviation diagnostic. DD limits the upper
range to 10.
DEVIATION_ENG_UNITS Units tied to the deviation output value
DEVIATION_ALERT_SEVERITY
Advisory, Maintenance, Failure
0 = Disabled = Does not use the limits, but provides an
output
1 = Advisory = No effect on sensor status, sets advisory
PWA
2 = Maint = Sets sensor status to uncertain, sets
advisory PWA
3 = Failure = Sets sensor status to Bad, sets advisory
PWA
DEVIATION_PCNT_LIM_HYST
Deviation Hysteresis Limit = (1 -
DEVIATION_PCNT_LIM_HYST/100) * DEVIATION_LIMIT
RATE_INCREASING_LIMIT Increasing Rate of Change limit set point
RATE_DECREASING_LIMIT Decreasing Rate of Change limit set point
RATE_ENG_UNITS Units tied to the rate of change output value
RATE_ALERT_SEVERITY
Advisory, Maintenance, Failure
0 = Disabled = Does not use the limits, but provides an
output
1 = Advisory = No effect on sensor status, sets advisory
PWA
2 = Maint = Sets sensor status to uncertain, sets
advisory PWA
3 = Failure = Sets sensor status to Bad, sets advisory
PWA
RATE_PCNT_LIM_HYST
Rate of Change Increasing Hysteresis Limit = (1 -
RATE_PCNT_LIM_HYST/100) *
RATE_INCREASING_LIMIT