Emerson Rosemount OCX 8800, Instruction Manual

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Instruction Manual
IM-106-880C, OI
Section 7: Foundation
Fieldbus
April 2017
COMB_PERCENT_OF_
RANGE
COMB_PREVIOUS_
CONSTANT % The percent of range of the current combustibles reading.
PPM The combustibles calibration constant from the previous good cali-
bration.
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
COMB_PRIMARY_VALUE_
TYPE
COMB_REFERENCE_
OHMS
COMB_SECONDARY_
VALUE
COMB_SECONDARY_
VALUE_RANGE
COMB_SENSOR_CAL_
DATE
COMB_SENSOR_
EXCITATION
See FF903
section 4.1
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.
See FF-903 section 3.3.
Ohms The raw value of the combustibles reference input.
The combustibles cell temperature. This is the determined from the
value of the combustibles reference RTD.
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.
See FF-903 section 3.3.
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
COMB_TIME_TO_NEXT_
CAL mV Combustible Block T/C voltage (Valid only with Type 3 sensor).
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)
COZERO_PURGE_TIME 60-180 Seconds The duration of the Combustibles sensor zero purge.
COZERO_STATE 0, 1, 2 The current step of the Combustibles sensor zero cycle. (0=Idle,
1=Flowing, 2=Purging)
COZERO_UPDATE 0: Off – 1: On Enumerated Indicates whether the Combustibles calibration constants should be
updated after Combustibles sensor zero.
DETAILED_STATUS_1 0-16777215 Bit Enum A bit-enumerated value used to communicate the status of the OCX.
(This is similar in nature to the command 48 status bits in HART).
DETAILED_STATUS_2 0-16777215 Bit Enum A bit-enumerated value used to communicate the status of the OCX.
(This is similar in nature to the command 48 status bits in HART).
Transducer Block Parameters 105
Parameter Mnemonic Valid Range Units Description