POX CO Reactor Thermocouple Probe

What is a POX Thermocouple Probe?

POX probe

A POX Probe, sometimes know as a CO reactor thermocouple, is a special design of thermocouple sensor found in partial oxidation plants. Partial Oxidation Plants are used to form hydrogen, carbon monoxide, carbon dioxide or Synthesis Gas (syngas). A typical assembly consists of a ceramic sheath at the hot end of the probe. Followed by an Inconel coating for further temperature resistance. A forged flange, which is them fitted and welded to the sheath. Finally an RTJ is used to press the flange and the sheath together, forming a pressure seal. This assembly can work effectively at temperatures with a maximum of 1500°C.

Type Designation:


Temperature Range:

0 to 1500 ° C

Lengths Available:

Up to 1500mm

Common Sheathing:

Recrystalised Alumina+ Inconel Shank

Conductor Pairs:


Sensor Type:



BSEN 60584 Class 1 (R,S)
BSEN 60584 Class 2 (B)


Full Pressure Test
Insulation Test

Application Notes:

Designed for Partial Oxidation/SynGas Plants.
Typically used in 5 to 10 piece sets.

Special Options:

  • 4” 600lb Ring-type Joint (RTJ) forged flange is common.
  • Available with full certification documents.

POX Probe Expertise

We have made POX probes since we were established in 1997, and our sensors are in use in POX plants all over the globe. All of our POX probes are pressure tested to 160 bar to reassure you of their strength, reliability and quality manufacture. All welding is completed to ASME Standards.

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