Probe Location on Furnace
If the enriching gas supply has a separate inlet, locate the probe in the following manner:

• close to atmosphere intake, where atmosphere is well mixed and at furnace temperature
• as far away from the fumes of quench oil as possible
• as far away from door opening as possible
• work load should be clean – free from oils
• probe should not be located in a “hot spot”
• avoid hot spots in the furnace
• the probe can be mounted at any angle

Generally, locate the oxygen probe in an area where the furnace gases are known to be thoroughly mixed. Locate in a wall area reasonably free from other pipes and valves to simplify installation and replacement.

Mounting the Probe and Air Supply
The probe is supplied with a compression fitting which has 1” NPT male threads. Install a mounting fitting with 1-1/2” NPT female threads and use a 1” x 1-1/2” reducing bushing. This permits easy removal after soot buildup on the protection tube.

Mount the reference air supply in an area where the ambient temperature is less than 125°F. if mounting on the furnace, have at least 8 inches of air space between the supply and the furnace wall.

Oxygen Sensor Wiring
A cable containing wiring for the thermocouple compensating cable and leadwire for the probe and reference air supply tube should be free from interference from other electrical or heat sources.

Do not place power wiring and sensor wiring in the same conduit or wiring trough. The wires from several oxygen probes may be placed in the same conduit or wiring trough.

Recommended Leadwire: 22 gauge, Teflon insulated. The Barber-Colman Part Number for wire is:

Blue Wire – DYZP 132-622-6-00
Gray Wire – DYZP 132-822-8-00

Readout: For direct millivolt readout, a 4-1/2 digit meter with a basic accuracy of 0.05% or better is recommended.

Thermocouple Wiring
NEVER wire thermocouples using ordinary copper wire. Wire only with thermocouple extension wire.

Observe the correct thermocouple and thermocouple extension wire polarity. The negative wire of both thermocouple and thermocouple extension wire is coded red.

Recommended TC Extension Wire: 20 gauge, solid, duplex, glass braid insulated.