Watlow Thermocouples

  • Temperatures up to 900 Deg F
  • Outside Diameter 0.125, 0.1875 or 0.25 in.
  • Many Thermocouple Variations and Applications


Watlow Thermocouples meet a broad range of sensing needs. Our extensive line of thermocouples feature flexible SERV-RITE® wire insulated with woven fiberglass or high temperature engineered resins. Additionally, for added protection against abrasion, products can be provided with stainless steel wire braid and flexible armor. Also ASTM E230 color-coding identifies standard catalog thermocouple types. The addition of a metal sheath over the thermocouple provides rigidity for accurate placement and added protection of the sensing junction. Furthermore mounting options include springs, ring terminals, specialized bolts, pipe style clamps and shims.

Companies engaging in critical process control of food and metals rely on Watlow thermocouples. Watlow designs and manufactures sensors to meet customers’ industrial and commercial equipment needs. ASH Equipment Company is an Authorized Distributor of Watlow Thermocouple products.

Performance Capabilities

• Fiberglass insulated thermocouples can reach temperatures up to 900°F (480°C) for continuous operation.

Watlow Tube and Wire Thermocouples Types for Medium Duty Processes

  •  Adjustable Spring Style Thermocouple
  •  Adjustable Armor Style Thermocouple
  •  Rigid Sheath Style, 1/8 and 3/16 inch diameter Thermocouple
  •  Rigid Sheath with Threaded Fitting Style Thermocouple
  •  Fixed Bayonet Style  Rigid Sheath Thermocouple
  •  Large Diameter Style Rigid Sheath Thermocouple
  •  Flange Style Thermocouple
  •  Other Thermocouple options: Flexible Extensions Style, Insulated Wire, Styles 61 and 62, Perfluoroalkoxy (PFA) Encapsulated Style, Ring Terminal Style, Nozzle Style, Pipe Clamp Style, etc…

Additional Watlow Thermocouples Type

  • Base Metal Thermocouples, up to 2300°F
  • MICROCOIL™ Thermocouples – Accurate, Repeatable, Fast Response in Perpendicular Surface Measurement


  • Watlow Series 5750 Temperature Transmitters
  • Watlow Thermocouple Connectors (variations: standard, quick-attach, high temp, 3-pole, miniature)

Typical Applications

  • Food processing equipment
  • De-icing
  •  Plating baths
  •  Industrial processing
  •  Medical equipment
  •  Pipe tracing control
  •  Industrial heat treating
  •  Packaging equipment
  •  Liquid temperature measurement
  •  Refrigerator temperature control
  •  Oven temperature control

Features and Benefits

Standard products including:

  • 32 standard sheath lengths
  •  Lead lengths from six to 360 inches
  •  Stainless steel braid or hose protection
  •  J, K, T and E calibrations
  •  Grounded, ungrounded and exposed junctions
  •  Flat and drill point
  •  Epoxy sealed cold ends
  •  Adjustable depths
  •  Flexible extensions
  •  Washers, nozzles and clamp bands
  •  PFA coated and stainless steel sheaths
  •  Straight, 45° bend or 90° bend
  •  Locking bayonet caps in standard
  •  300 series stainless steel tubing

Additional options available in metric sizing.

We provide engineering and product support for your application.

Technical Documentation

Download PDF Files:

Watlow Thermocouples

Watlow Base Metal Thermocouples

Watlow Microcoil Miniature Thermocouples

Watlow Series 5750 Temperature Transmitters

Watlow Thermocouple Connectors