Watlow 8LS Controller - Manual (Page 113)

Appendix B: 8LS-CP
8LS User’s Guide 105
Appendix B: 8LS-CP
The 8LS-CP controller with a Zirconia Carbon Probe assembly can
control and record the Dew point of atmosphere generators or the
percentage of Carbon Potential of hardening and sintering furnaces.
The 8LS-CP can accept direct connection of one to four Zirconia carbon
probes without any special external signal conditioning amplifiers. The
high impedance amplifier with the proper filter components mounted in
the 8LS-CP provide a correct reading of the probe millivolt output
without using an external probe amplifier. Direct connection of the
probe reference type N, K, R, or S thermocouple is standard.
Loops that are not used for carbon input may be used as standard inputs
for PID control and recording of other process parameters such as
temperature zones.
Key Features
• Selectable direct reading and control of Dew Point (DP), percentage
of Carbon Potential (CP), or probe Millivolts (mV).
• Automatic indication of probe out of range conditions as to high/low
temperature or high/low probe millivolt.
• Easily adjustable CO+CO2 and Hydrogen percentage levels for cor-
rect atmosphere reading.
• Easily adjustable process variable offset corrects for thermocouple or
probe sensor irregularities.
• Automatic probe Burn Off function with selectable contact or inter-
val timer start.
• Trim Gas temperature warning alarm 1400-2400ºF output per probe
input.
• Independent Ramp/Soak temperature carbon programmer for boost
carbon control.