Starting at $55.95
  • Call for availability



  • Special mineral insulation protects thermocouple form moisture and thermal shock
  • Permits operation in high termperature and pressure environments
  • Small diameters are ideal when physical space or extremely fast response are critical
  • Flexible NACTPAK material allows forming and bending of the thermocouple
  • Outer sheath protects wires from oxidation and hostile environments
  • Wide range of sheath materials, diameters and calibrations to meet specific requirements


Metal transitions are the distinguishing feature of style AQ thermocouples. The transition provides a durable, potted connection between the XACTPAK sheathed thermocouple material and the flexible SERV-RITE® insulated wire.

The style AQ miniature transition thermocouple is designed for limited space applications where size and/or response time are critical. It is designed to give instant readings in various mediums. More accurate readings are possible because of its small size and fast response.

Mineral Insulated Thermocouples

Watlow's mineral insulated thermocouples are fast-responding, durable and capable of handling higher temperatures.

These thermocouples are manufactured with XACTPAK®, Watlow's trademark for metal-sheathed, mineral insulated (MI) thermocouple material. XACTPAK responds fast because the protective metal outer sheath allows the use of smaller diameter thermocouple conductors. The rock hard compacted MgO insulation further enhances the sensor's ability to "read" temperature by transferring heat quickly to the measuring junction.

The XACTPAK protecting sheath and compacted insulation outperforms bare wire thermocouples in most applications.


  • Heat treating
  • Furnaces/kilns
  • Turbines
  • Bearing temperature
  • Power stations
  • Steam generators
  • Diesel engines
  • Nuclear reactors
  • Atomic research
  • Jet engines and test cells
  • Rocket engines
  • Semiconductor manufacturing
  • Refineries/oil processing
  • Catalytic reformers
  • Food Processing