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Instruction Manual
IM-106-880C, OI
September 2009
Hazardous Area OCX 8800
7-14
COMB
_SENSOR_CAL_WHO
See FF-903 section 3.3.
COMB_AUTOCAL_
INTERVAL
0-9999 Hours The time between automatic calibrations of the combustibles sensor.
COMB_CAL_POINT 0-55000 PPM The value of the combustibles test gas.
COMB_CONSTANT -99.0-99.0 PPM The combustibles calibration constant.
COMB_DELTA_
RESISTANCE
Ohms The raw value of the combustibles level input. This is the difference
between the active and reference RTDs.
COMB_FAILED_CONSTANT PPM This is the constant value calculated from the last failed Combustibles
calibration.
COMB_FAILED_SLOPE PPM/Ohm This is the slope value calculated from the last failed Combustibles
calibration.
COMB_HTR_DUTYCYCLE Combustibles heater duty cycle.
COMB_PERCENT_OF_
RANGE
% The percent of range of the current combustibles reading.
COMB_PREVIOUS_
CONSTANT
PPM The combustibles calibration constant from the previous good calibration.
COMB_PREVIOUS_SLOPE PPM/Ohm The combustibles calibration slope from the previous good calibration.
COMB_PRIMARY_VALUE The value and status of the combustibles concentration reading.
COMB_PRIMARY_VALUE_
RANGE
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
reading.
COMB_PRIMARY_VALUE_
TYPE
See FF903
section 4.1
See FF-903 section 3.3.
COMB_REFERENCE_
OHMS
Ohms The raw value of the combustibles reference input.
COMB_SECONDARY_
VALUE
The combustibles cell temperature. This is the determined from the value
of the combustibles reference RTD.
COMB_SECONDARY_
VALUE_RANGE
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
See FF-903 section 3.3.
COMB_SENSOR_
EXCITATION
mA Combustible Reference current.
COMB_SENSOR_TYPE See FF-903 section 3.3 and 4.3.
COMB_SETPOINT
°C
Combustibles heater temperature set point.
COMB_SLOPE 200-4500 PPM/Ohm The combustibles calibration slope.
COMB_SLOPE_WARNING 25.0-99.0 % of FS The combustible 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 °C The highest Combustibles temperature read since power on.
COMB_THERMOCOUPLE_
INPUT
mV Combustible Block T/C voltage (Valid only with Type 3 sensor).
COMB_TIME_TO_NEXT_
CAL
0-9999 Hours The time until the next automatic calibration of the combustibles sensor.
COMB_TOL_CHECK 0: No – 1: Yes Combustible calibration gas tolerance check.
COZERO_DURATION 120-600 Seconds The duration of the Combustibles sensor zero cycle.
COZERO_ENABLED 0: Off – 1: On Enumerated Indicates whether Combustibles sensor zero is enabled.
COZERO_INTERVAL 60-480 Minutes The time between Combustibles sensor zero cycles.
COZERO_OUTTRAK 0, 1, 2, 3 Enumerated Indicates whether the Combustibles analog output should track the input
during Combustibles sensor zero or lock at the last process reading.
(0=None, 1=O
2
, 2=CO
2
, 3= Both)
Parameter Mnemonic Valid Range Units Description