Honeywell VRX180 user manual Carbon Potential, Carbon Prompts

Programming Function Blocks and Features

Carbon Potential

The Carbon Potential Control Function Block provides for weight percent (wt%) control of carbon in carburizing, hardening, and atmosphere generating applications.

Table 4-38 Carbon Prompts

Prompt	Range/Selections	Definition
PROBE TYPE	NONE, AACP, SUPER	Selection which represents the manufacturer of the
	SYS, MARATHON, FCC	oxygen probe being used. This determines which
		linearization equations are used for %C and dewpoint
		calculations.
CARBON PROBE IN	NUMBER, PARM, OFF	Analog input that is connected to the oxygen probe mV
		output.
PROBE TEMP INPUT	NUMBER, PARM, OFF	Analog input that is connected to the oxygen probe
		temperature output.
TEMPERATURE UNIT	NONE, F, C, K, R	Temperature scale for this block. This selection must
		match the temperature scale of the analog input that is
		connected to the oxygen probe temperature output.
TEMP LOW LIMIT	NUMBER, OFF	Probe temperature value below which this block’s low
		temperature discrete output (OS) is turned ON. This limit
		and subsequent discrete output may be used to force the
		control loop’s output to a known value when the probe
		temperature is too low for carbon potential control.
CO COMPENSATION	NUMBER, PARM, OFF	Number used in the %C calculation which represents the
		%CO present in the endothermic gas.
FURNACE FACTOR	NUMBER, PARM, OFF	Correction factor used to account for environmental
		variation within the furnace chamber. In units of %C, this
		factor is added directly to the %C value calculated from
		probe output linearization.
SOOTING FACTOR	ON, OFF	Boolean value that determines whether the anti-sooting
		factor output (A1) will be based linearly on probe
		temperature (SOOTING FACTOR=ON) or a constant
		value of 2.0 (SOOTING FACTOR=OFF). If SOOTING
		FACTOR is ON, a probe temperature of 1408 ° F or
		below limits %C output to 0.75% and 2086 ° F or above
		limits %C output to 2.0%.
PERCENTAGE	NUMBER, OFF	Number representing %H2 that is used in the dewpoint
HYDROGEN		calculation.

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