Top 10 Thermocouple Manufacturers in the USA

A thermocouple is a temperature sensor with applications ranging across industries and is used to measure temperature in extreme environments.

The thermocouple market in the USA is witnessing significant growth and is expected to increase by 13.2% globally between 2023 and 2030.

Top 10 Thermocouple Manufacturers in the USA

To make the search for high-tech thermocouples and related accessories a little easier for suppliers, distributors, and consumers, we have curated a list of the top 10 thermocouple manufacturers in the USA.

Rama Corporation

Rama Corporation is leading the electronics industry in the USA for more than 76 years now. They are the first Industrial Heating elements manufacturers in the USA. Their product catalog includes- thermocouples, band and strip heaters, immersion heaters, multicell heaters, etc. Rama’s target industries include- pharmaceutical, aerospace, automotive, etc.

Thermocouple Technology, LLC

Thermocouple Technology was established in 1985 and is a pioneer in Precision Temperature measurement and Temperature Control Devices manufacturing and supply. Their products and services expand to industries like – power, chemical, OEM (Original Equipment Manufacturer), industrial controls and instrumentation, pharmaceuticals, food and beverage, cement, import/export supply, non-ferrous metals, pulp and paper, engineering firms, etc.

Thermocouple’s product portfolio includes-

  • Thermocouples – field-cuttable, industrial, power industry
  • RTDs
  • Thermowells
  • Thermocouple wires and accessories
  • Transmitters
  • Indicators

STI Manufacturing, Inc.

STI Manufacturing was established in 1984 and is a leading manufacturer of temperature sensing devices and equipment. Their major products are sold to plastic industries across the US, large engine manufacturers, petrochemical plants, and companies in need of custom temperature sensors. Their product line includes – thermocouples, thermowells, needle and gauge valves, RTDs, and manifold valves.

Kelvin Technologies

Established in 2000, Kelvin Technologies is leading the electronics industry by providing heaters and sensors in security applications, thermal solutions for the medical industry, and highly engineered solutions for the plastics industry. They have a stronghold on industries like- aerospace, medicine, industrial machinery, energy, plastics, transportation, security, semi-conductor, etc. Kelvin’s services include- extruder rebuilds, custom-engineered assemblies, and calibration. Their top-ranking products include- temperature control devices, temperature sensors, heaters, wiring harnesses, thermocouples, manufactured assemblies, relays, and accessories.


Them-X was started in 1983 and is a leader in Industrial heaters, sensors, controllers, and control panels. They are among the known manufacturers and suppliers of robust temperature and process control systems, thermal solutions like thermal design and test, CNC machining, sheet metal manufacturing, metal joining, and integration with electro-mechanical assemblies. They are an AS9100 REV.D/ ISO 9001:2015 accredited company and serve industries including- alternative energy, aerospace, automotive, food and beverage, petrochemical, chemical/environmental conditioning, plastics, and semiconductors. Therm-X’s products include- air heaters, thermocouples, thermistors, container heaters, mantle heaters, transmitters, wires, and accessories.

Thermalogic Corporation

Since its inception in 1971, Thermalogic has been into building temperature, humidity, and process controls. They possess 50+ years of experience in serving temperature sensor assemblies and temperature and humidity transmitters. Thermalogic’s target industries are- environment equipment, food processing equipment, military HVAC, medical, lab and testing equipment, liquid chillers, industrial HVAC, heat treatment equipment, industrial ovens, semiconductor processing equipment, railcar HVAC, etc. They have also made significant advancements in technologies like IoT (Internet of Things) and internet-enabled controls and transmitters.

ThermoSensor Corporation

Thermo Sensors started in 1972 and has been a leading provider of high-tech and robust thermocouples and RTD assemblies to industries like- environment, power, pharmaceutical, chemical, petrochemical, refining, food, etc.

Thermo’s product line includes-

  • MGO Thermocouples
  • Industrial Thermocouples
  • Thermowells
  • Resistance Temperature Detectors (RTDs)
  • Wires and accessories

ARi Industries Inc.

ARi Industries was established in 1952 in Chicago, Illinois. They are among the leading manufacturers of thermocouples, RTDs, heating elements, conductor cables, and thermowells for industrial and commercial applications. Ari’s target industries are- diesel engines, automotive, military, energy, oil/gas, industrial processes, steel, petroleum refineries, national research labs, pharmaceutical, semiconductors, furnaces/kilns, aerospace, nuclear, gas turbine, etc. Their thermocouple range includes-

  • Base Metal
  • HighTemperature
  • Industrial
  • Multi-level
  • Tube-skin

Temperature Specialists, Inc.

Temperature Specialists was founded in 1977 and specializes in special assembly, molding of plastic parts, miniature welding, and manufacturing of custom hot wire anemometers. They are a custom manufacturer of process control temperature sensors, resistance temperature detectors, thermocouples, thermowells, molded handle probes, and thermistors among others. Their target application areas include- home appliances, industrial equipment, automotive, medical, and electronics. Let us look at the range of thermocouples offered –

  • No Sheath Style
  • Non-metallic sheath style
  • Plain sheath style
  • Transition sheath style
  • Double pipe thread style
  • Spring loaded double thread style
  • Thermowell style
  • handheld style
  • Stick-on style


Established in 1962, Pyromation is an ISO-9001 accredited company. They are known for their NVLAP-accredited metrology laboratory. Pyromation’s product catalog includes- thermocouples, transmitters, connection heads, thermowells, wire, and accessories. Their products and services reach industries like- aerospace, food and beverage, HVAC, mining, rubber, chemical, plastics, pharmaceuticals, biomass, metal processing, etc. Pyromation is among the leading manufacturers of thermocouples and RTDs in North America.

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