Enercorp Instruments makes temperature sensors and transducers, including a general purpose industrial sensor, an accurate platinum RTD with thermocouple calibrations and a rugged construction. It also features a threaded cast aluminum head with gasket, with a 3/4" NPT female opening for piping or standard electrical fittings. It also has a standard process connector of 1/2", a standard sheath of 1/4", and is for temperatures up to 200C, 400C, or 600C with a thin-film RTD sensor.

Watlow makes resistance temperature sensors with ceramic elements for a temperature range of -200 to 650C, with a high signal-to-noise output, with insulation resistance values exceeding DIN-IEC-751 standards which minimizes self heating and ensures sensor sensitivity. These RTDs are available in a 6 or 12 inch adjustable spring style, an adjustable armor style, an open air (with or without flange) type, a cartridge with flange model, and a surface mount model.

Madison Co. offers resistance temperature detectors, including industrial 100 OHM probes (rigid mount), closed-tip probes, and their Madison-Omni RTDs, with a platinum probe and stainless steel (316) sheath, an analog 4-20 mA output signal with supply voltage of 10-30 VDC. This probe also has an electrical connection with an M12x1 thread, a process connection with a G 1/2 or 1/2" NPT thread, meeting IP67 standards.

Omega Engineering Inc. offers RTD probes, elements, and assemblies, including sanitary sensors, such as their PRS-M12 series RTD sensors, 3-A spprived with an M-12 connector, for hygienic, clean-in-plae, and sanitary applications with a 4-pin connector and 1.5" 16 AMP tri-grip fitting, in prove lengths of 3", 4", 5" or 6", with a temperature range from -50 to 200C and is compatible with 3-wire and 2-wire RTD instruments and transmitters.

LakeShore makes cryogenic resistance temperature detectors, including positive and negative temperature coefficient models, the positive types in platinum or rhodium-iron while the negative temperature types in Cernox, Cernox HT, Germanium, Carbon-Glass, or Ruthenium oxide. The Cernox sensors can be used from 100 mK to 420K, with magnetic fields up to 30T and are resistant to ionizing radiation.

Pyromation makes resistance temperature detectors and sensors, including bearing sensors, non-intrusive single and double wall sensors, tri-clamp sensors, can-style sensors, plastic detectors, explosion proof sensors, Teflon-coated RTD assemblies, heat tracing RTDs, averaging sensors, thermostat sensors, and variable length RTD sensors. Their plastic sensors include melt-bolt type, spring- or armor-adjustable immersion RTDs, threaded nozzle sensors, and ring RTDs.

Ultra Electronics offers several types of resistance temperature detectors, including spring loaded types, explosion proof models, 1/2" NPT hex nipple models, direct immersion sanitary models, non-intrusive flow through sanitary sensors, autoclave temp sensors, embedded temp sensors, spring loaded bayonet fitting sensors, and more for applications including furnaces, plastics processing, textile production, medical research, and others.

MTI Industrial Sensors has general purpose RTDs, in 2, 3, and 4 wire designs in single, dual, or triplex construction. Their sheath diameters measure from .125" to .500" OD, with a mineral insulation for high temp or mechanical vibration applications. They also offer RTD elements including platinum (100, 200, 500, or 1000 OHM), Copper-10OHM, and nickel 120 OHM.

TTEC sells precision platinum RTDs including those with a weatherproof head and stainless steel fitting, spring-loaded 1/2" NPT connections, low temperature models, and other sensors. These RTDs come in single or dual element types with 2, 3, 4, 6, or 8 wire leads and a maximum temperature of 400F, 900F, or 1200F.

Nanmac offers Resistance Temperature Detectors, with conduit heads or plugs and leads. They also offer RTD cable assemblies. Their standard probe has a 100 OHM platinum element with alpha of 0.00385, sheath made of 304SS, and a 3/16" or 1/4" diameter and a length of five inches. This probe typically comes with a three pronged plug when ordered with a plug, and those with a lead wire can be in two or three conductor type. This RTD is also available with a stainless steel overbraid.