Table 8-3: Transducer Block Parameter Descriptions
(continued)
Parameter mnemonic Valid range Units Description
COMB_SECONDARY_VALUE N/A N/A The combustibles cell
temperature. This is
determined from the
value of the
combustibles reference
resistance temperature
device (RTD).
COMB_SECONDARY_VALUE_
RANGE
N/A N/A The high and low range
limit values, the
engineering units code,
and the number of digits
to the right of the
decimal point for the
combustibles cell
temperature reading.
COMB_SENSOR_CAL_DATE N/A N/A See FF-903, Section 3.3
COMB_SENSOR_EXCITATIO
N
N/A mA Combustible reference
current.
COMB_SENSOR_TYPE N/A N/A See FF-903, Sections 3.3
and 4.3.
COMB_SETPOINT N/A ° C Combustibles heater
temperature set point.
COMB_SLOPE 200-450 ppm/Ohms The combustibles
calibration slope.
COMB_SLOPE_WARNING 25.0 - 99.0 % of FS The combustibles slope
warning threshold.
COMB_T90 0 - 300 Seconds The amount of time that
the combustibles
process variable will take
to reach 90% of the
actual process variable.
COMB_TEMP_MAX N/A ° C The highest
combustibles
temperature since power
on.
COMB_THERMOCOUPLE_
INPUT
N/A mV Combustible block
thermocouple (T/C)
voltage (valid only with
Type 3 sensor).
COMB_TIME_TO_NEXT 0 - 9999 Hours The time until the next
automatic calibration of
the combustibles sensor.
COMB_TOL_CHECK 0: No
1: Yes
N/A Combustible calibration
gas tolerance check.
Manual FOUNDATION
™
Fieldbus
00809-0500-4880 December 2022
Rosemount OCX8800A 133
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