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Economy Carbon Probe

Available with quick-connect plugs to suit most probe installations. 

Redundant Carburizing System

Coupled with our 3504 atmosphere controller this can be used as a well priced redundant carburizing system. As our 1/4DIN flagship Programmable controller - the 2-loop 3504  includes options for control of both furnace atmosphere as well as precision temperature control throughout the furnace program cycle. This can be used for the Gas Nitriding process (utilizing a Hydrogen sensor) or Gas Carburizing processes (using an Oxygen/Carbon Probe).

Rugged Design

The AP8 series carbon probe provides the benefit of low cost without compromising quality. Economy has been achieved with off the shelf components and a simplified design. The AP8 uses the same proven Zirconia cell as our AP1 series probe. All of the other components are top quality as well. The protection tube is 1/2 inch, NPT full schedule 40, RA 330 pipe. The screw cover Aluminum connection head is the same as used on our thermocouples, providing further cost reduction. All non-immersed components are rated for 260°C (500°F) or higher.

Reduced Catalytic Effects

AP8 Connectors
Carbon Probe

FEATURES:

  • Reduced cost - improved design

  • High flow-through tip design

  • New seal doesn’t restrict spring tension

  • RA 330 protection tube

Several connection options :

  • Screw terminal block

  • Eurotherm QD plug

  • Marathon QD plug

  • Accucarb QD plug

Heat treatment atmospheres contain excess Methane, which provides the enrichment reactions:

CO2 + CH4  <-->  2CO + 2H2

and:

H2O + CH4  <-->  CO + 3H2 

 

Methane is a stable molecule that requires a catalyst to crack. Unfortunately, the protection tube of a carbon probe is a good catalyst. The enrichment reactions occur with atmosphere within the probe, causing an indication of a higher carbon potential than in the remainder of the furnace. Our new open tip design with ten side ports minimizes the residency time of the atmosphere, thereby reducing the enrichment reactions. Using RA 330 as the tube material also helps reduce undesired reaction. RA 330 has a lower Nickel content than most other heat resistant alloys, yet it has a proven history in carburizing applications.

Connections

The AP8 has a ceramic terminal block for connections similar to that of a thermocouple. In addition, quick disconnect plugs are available in Eurotherm/Barber-Colman, Marathon and Accucarb formats. These plugs can be ordered with the probe and are also available as separate line items. Plug adapters can also be easily moved from one probe to another.

AP8 Tip
AP8 Drawing

Specifications

Operating Temperature Range: 760°C to 980°C

Thermocouple Options: Types K, N, R & S (Types R & S available in either 24 or 30 Gauge)

Immersion Depth: 3 to 6 inches past insulation

Accuracy: ±0.05 points carbon, in most applications

Response Time: Less than one second

Reference Air Fitting: Barbed, for 1/8 inch I.D. tubing

Purge Air Fitting: Barbed, for 1/8 inch I.D. tubing

Downloads

Specification & User Documentation

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