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Sensors • Resistance Temperature Detectors (RTDs)

One of the two most common ways of measuring industrial process temperatures, resistance temperature detectors (RTDs) contain resistors that change resistance value as its temperature fluctuates.RTDs offer a number of advantages over thermocouples or thermistor sensors including: better accuracy, long-term stability, repeatability, interchangeability, and a wide temperature range – from -200 to 850°C.Typically made of platinum, RTDs are not affected by corrosion or oxidation. The most widely used types of RTDs are carbon resistors, film, and wire-wound, which are available in two-, three-, and four-wire configurations.

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  • Sensing Devices, Inc.

    Sensing Devices, Inc. offers high accuracy resistance temperature detectors for precision measurement, as well as thin film products, platinum wirewound elements, and custom probe sub-assemblies. Additionally, they also offer calibration services, such as NIST traceable services, for metrology equipment, and fixed standard reference resistors.

  • C-Temp International

    C-Temp makes resistance temperature detectors, with eight standard styles with a temperature range from -200 to 1200F, in platinum, nickel, and copper. These RTDs can use varying thermocouple heads, including HECAT, HUCI, HECA, HUCA, HMWH, HSCI, HSCA, HLCA, HMCA, HMWS, or without a head. They also feature 2, 3, 4, or 6 wire models, their two wire, white and black; the 3 wire, 1 white and 2 black; the 4 wire, 2 white and 2 black; and the six wire, dual, two black and one white, two red and one white. These require a 3-pin plug and ground wire, with supply matching jack.

  • Enercorp Instruments Ltd

    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

    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.

  • Precision Measurements, Inc.

    Precision Measurements offers resistance temperature sensors, with a sheath diameter of 0.125", 0.188", 0.250", 0.313", or 0.375", with types including a spring loaded model for standard head, a general purpose stem sensitive model, a spring loaded explosion proof head, a 316SS standard sheath, or custom. Fitting types include hex nipple, hex bushing with head or process connection, hex nipple oil seal, bayonet spring loaded, or hex niple spring loaded.

  • Madison Co.

    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.

    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.

  • Lake Shore Cryotronics

    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.

  • Minco

    Minco makes RTD sensor probes which are mineral insulated to 650C, with single and dual elements. Types include tip sensitive RTDs, electrically isolated RTDs, bayonet mount tip sensitive type, fast response types, and 550C RTD types. Their fast response RTDs are encased in stainless steel with a copper alloy tip, with a max case length of 48", and can withstand 10 to 2000Hz at 20Gs minimum vibration.

  • Pyromation

    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.

  • Autonics USA

    Autonics offers RTD and thermocouples such as CA, IC, CC, CRC, and PT100 OHM, with their TH-L product with a 0.3 or 0.65mm/min, while their TW-N model has a standard compensating wire length of 1.5 mm, a sensing head diameter of 4.8mm, a sensing head length of 30mm, and screw specification of 1/8". They also offer fiber-optic sensors, photoelectric sensors, proximity sensors, and rotary encoders.

  • General Resistance, a div of Prime Technologies

    Prime Technology offers RTD simulators, including their RTD-200 model, with a shunt decade design, resistance range from 20.00 to 1121.10, switch life rating  > 50,000 hours, breakdown voltage of 750VRMS, temperature range from -55C to 75C, and overall accuracy statement of +/- 0.02% absolute. Their RTD-500 model features programming with keypad data entry.

  • MTI Industrial Sensors

    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.

  • DeviceTec, Inc.

    DeviceTech sells Hayashi Denko high tech temperature detectors, thin film platinum models with three resistance values of 100, 500, or 1000 OHM and is made to meet DIN, IEC, and JIS standards with temperature ranges from -50C to 650C and a temperature coefficient 0.003851. These RTDs use ceramic surface for greater resistance to shock and vibration.

  • Temperature Specialists, Inc.

    Temperature Specialists offers thin film platinum RTDs, wire wound platinum RTDs, connector style assemblies, transition style assemblies, bayonet assemblies, and sheath style assemblies. Their platinum resistance temperature detectors use temperature coefficients of 0.00391 OHM. They also offer industrial assemblies and hollow elements, and process control sensors.

  • Thermocouple Technology, Inc.

    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 Corp.

    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.

  • Quality Thermistor, Inc.

    Quality Thermostator Inc. makes platinum resistance temperature detector probes, made from a Class 1/3 DIN, Class B, Class A, or Class 2B thin film platinum elements, in 100 OHM, 500 OHM, or 1,000 OHM models. These probes operate from -70C to 500C in temperature, depending on the model, and are housed in stainless steel, titanium, plastic, molded, brass or Kapton housing.

  • Harco Laboratories, Inc.

    Harco Laboratories Inc offers resistance temperature detectors or RTDs of high accuracy. Their RTDs feature platinum materials, wire wound elements, hermetically sealed construction, low excitation current, high signal to noise ratio, fast linear response, wide temperature range and low maintenance. They are used to monitor aircraft products including engine fuel, cabin temperature control, compressor discharge, brake pads, engine bearing oil and inlet air ducts.

  • Furnace Parts LLC

    Furnace Parts LLC designs resistance temperature devices in 2, 3 and 4 wire designs with up to 100 Ohm resistance. Leads include standard temperature, Teflon insulation, high temperature and fiberglass insulation. Termination heads include aluminum, cast iron, tube adapter with connector, terminal block and transmitter.