Emerson Rosemount 848T, Reference Manual, Page: 58 / 136

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Reference Manual
00809-0100-4697, Rev GA
Section 3: Configuration
November 2014
Configuration
Table 3-24. Validation Value Sub-parameter Structure
Table 3-25. Validation Config Sub-parameter Structure
Validation value sub-parameter structure
Parameter Description
VALIDATION_STATUS State of the channel specific measurement validation measurement
DEVIATION_VALUE Deviation output value
DEVIATION_STATUS Status of the deviation output
RATE_OF_CHANGE_VALUE Rate of change value output
RATE_OF_CHANGE_STATUS Status of Rate of change output
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