Honeywell VRX180 Manuale Utente

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

 

PROBE TYPE 

NONE, AACP, SUPER 
SYS, MARATHON, FCC 

Selection which represents the manufacturer of the 
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 

HYDROGEN 

NUMBER, OFF 

Number representing %H

2 

that is used in the dewpoint 

calculation.