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Contact Sensors Guide
Watlow contact temperature sensors come in a variety of types and constructions.
Types include:
  • Thermocouples; in ASTME 230 and non-ASTM Types, available in standard and special tolerances
  • Platinum wire wound RTDs; available in DIN temperature coefficients
  • Thermistors; negative temperature coefficient in a variety of base resistances. Positive coefficient thermistors are available on made-to-order units.
Constructions cover the wide variety of packages available to meet specific application needs.

Watlow Thermocouples
Tube & Wire

Good, general purpose thermocouple available in a wide variety of constructions and mounting methods. Over 5,000,000 stock variations available for next day shipment. Fiberglass insulated Type E, J, K and T thermocouples capable of temperatures up to 900°F (480°C). Available as a probe, washer, pipe clamp, shim, melt bolt and grommet sensor. Mounting methods include bayonet, flange, nozzle, magnetic and peel-and-stick. Probes come in straight, forty five and ninety degree bend constructions in both SAE and metric sizes.

Applications

  • Plastic injection molding machinery
  • Food processing equipment
  • Deicing
  • Plating baths
  • Industrial processing
  • Medical equipment
  • Pipe tracing control
  • Packaging equipment
  • Industrial heat treating
  • Liquid temperature measurement
  • Refrigeration equipment
  • Oven temperature control

  • Mineral Insulated

    Mineral insulated thermocouples are fast responding and durable, capable of temperatures up to 1200°C (2200°F). Available in a variety of sheath materials and diameters to meet environment and response time needs. Exposed, grounded and ungrounded junctions meet response and electrical isolation requirements. ASTME 230 available in calibration Types E, J, K, N, R, S and T with a variety of sheath materials for environmental protection. Terminations include a variety of standard and mini plugs and jacks, connection heads and more. Mountings include fittings, bayonets and thermowells as well as weld pads on select styles.

    Applications

  • Heat treating
  • Furnace/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
  • Special Applications

    Capable of temperatures up to 2315°C (4200°F). Available in Types B, C, R and S with a wide selection of sheath and insulation materials to meet specific application conditions. Probe style construction offers application flexibility. Unique multi-point thermocouple permits a single sensor assembly to measure thermal gradients. True surface thermocouple offer superior accuracy for measuring flat surface temperatures.

    Applications

  • Turbines
  • Power stations and steam generators
  • Laboratory research
  • Diesel and jet engines
  • Nuclear environments
  • Storage tanks

  • Semiconductor manufacturing
  • Rocket engines
  • Turbines
  • Vacuum furnaces
  • Exhaust gas sensing
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    Base Metal

    Well suited for metal processing, chemical and storage tank temperature measurement. Type J and K calibrations are capable of temperatures up to 1260°C (2300°F). Constructions include insulated wire, bare and ceramic insulated elements. Thermocouples with protection include straight and angle types with connection heads and a variety of materials to meet application needs.

    Applications

  • Metal processing such as aluminum, zinc, brass (with appropriate protection tube)
  • Chemical and petrochemical processing
  • Industrial storage tanks

  • Noble Metal

    Platinum alloy thermocouples Types B, R and S are capable of temperatures up to 1700°C (3100°F). Available as bare elements, elements with insulators or assemblies. A typical assembly includes a head, alumina insulators and a protecting tube.

    Applications

  • Heat treating and control sensors
  • Semiconductor
  • Class manufacturing
  • Ferrous and non-ferrous metals

  • Watlow RTDs & Thermistors
    RTDs

    Platinum resistance elements ensure precise and repeatable temperature measurement and deliver interchangeability without recalibration. A wide temperature range of -200 to 650°C (-328 to 1200°F) makes RTDs suitable for many applications. Single element with, 2-, 3- and 4-wire constructions address leadwire resistance considerations. Available in a wide variety of probes including thermowell and optional connection head constructions. Versatile mounting methods extend application flexibility.

    Applications

  • Air conditioning and
         refrigeration servicing
  • Furnace servicing
  • Stoves and grills
  • Textile production
  • Plastics processing

  • Petrochemical processing
  • Exhaust gas temperature measurement
  • Air, gas and liquid temperature
         measurement
  • Micro electronics
  • Thermistors

    Available in negative temperature coefficients, with temperature ranges from -80 to 300°C (-112 to 570°F) in a range of base resistances. Constructions include probe, open air, cartridge, surface mount, bayonet and more.

    Applications

  • HVAC servicing
  • Textile production
  • Plastics processing
  • Petrochemical processing
  • Air, gas and liquid temperature measurement

  • Application Assistance
    For application assistance specific to your temperature measurement need, please contact your nearest Watlow sales office.

    Hytrel® is a registered trademark of E.I. du Pont de Nemours & Company.
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