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TCFW Series – Fine Wire Thermocouple Probes

Product Details

Measure Gas Temperatures with milliseconds response time 

Our fine wire thermocouple probes provide a rugged mounting method for inserting ultra-fine wire thermocouple junctions for precise rapid response gas temperature measurements. These probes are designed for applications such as air compressors, internal combustion engines, and wind tunnels where vibration, shock, or bending conditions in the environment preclude use of ordinary fine wire thermocouples. 

Thermocouple wires as small as 0.0005 inch are made capable of extended life by use of a unique fine wire mounting technique. Large (.010 – .013 inch diameter) thermocouple wires are swaged with magnesium oxide insulation within a corrosion resistant metal sheath. The ends of the wires are flattened and 0.005 inch dia. holes are drilled through the flattened ends. Each fine wire is then welded to the appropriate large wire, coiled around it, passed through the drilled hole and fusion welded at the hot junction. The welds to the large wire are then encapsulated in high  temperature ceramic cement. With this construction, the fine wires can be bent or vibrated without weakening the welded connection of the fine wire at its weld to the large wire. This feature assures a longer life for the fine wire thermocouple than would a conventional welded connection. 

These probes provide a rugged mounting method for inserting ultra-fine wire thermocouple junctions for precise rapid response gas temperature measurements in difficult environments. 

  • Wind tunnel single points or rakes 
  • Air bag inflation testing. 
  • Qualified for aerospace flight base gas temperature measurements. 
  • Explosive environment gas temperature measurements. 
  • Inside internal combustion engines….inside air compressors. 
  • Wire diameters down to 0.0005”…radiation shields and mounting options. 
Type C Fine Wire Thermocouple;1/8 Dia. Sheath  Part No. TCFW-202-02(W5W26)100-MP-11358

Fine wire probes are available in either 1/16″ sheath diameter for minimum cross section or in 1/8″ sheath diameter for sturdier mount or support of a radiation shield.  The 1/16″ sheath diameter probes can be ordered with 1/4″ of #1-72 thread on the sheath end and the 1/8″ sheath diameter probes may be ordered with 1/4″ of #5-56 thread on the sheath end for mounting in close quarters or for attachment of radiation shields or diffusers.  The probes may be bent to within 3/4″ of the hot end. 

The standard probes are supplied 5″ long with 3 feet of fiberglass insulated lead wire.  Other lengths may be specified.  Probes may also be ordered with other terminations, such as a quick disconnect thermocouple plug attached directly to the sheath or a miniature thermocouple head with cover.  Custom designs are available, including makeup of thermocouple rakes to customer specification. 

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