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Thermocouples consist of two dissimilar metal wires joined at a hot junction and generate a millivolt signal as the temperature changes. RTDs exhibit an increase in resistance as temperature rises. ProSense thermocouples and RTDs are available in a wide range of probe and installation styles.
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Temperature Sensors
Category Selection
- Probes with Connection Head
- Spring-loaded Probes with Connection Head
- Heat Trace Probes with Connection Head
- Probes with Hex Nipple
- Spring-loaded Probes with Hex Nipple
- Probes with Attached Plug
- Probes with Lead Wire Transition
- Probes with M12 Cable Connection
- Probes with Sanitary Connection
- Flange Mount Probes
- Cuttable Length Probes
- Melt Bolt Probes
- Adjustable Immersion Sensors
- Bolt-on Ring Sensors
- Threaded Bolt Sensors
- Room Sensors
- Spade Sensors
- Magnet Mount Sensors
Two of the most commonly used temperature sensors in the automation industry are the resistance temperature detector (RTD) and the thermocouple.
Thermocouples work based on the Seebeck effect, a phenomenon where a small voltage is produced across a junction of two dissimilar metals when exposed to a temperature gradient. The amount of voltage produced within the thermocouple is very small, usually millivolts, and is directly related to the difference in temperature across the junction. There are many types of thermocouples, and each is represented by a letter. The most common ones are J, K, and T which designate a specific temperature range and the wires of each type are color coded to identify them.
- Advantages: low cost, small size, wider temperature ranges and faster response than RTDs
- Disadvantages: less linear and accurate than RTDs, a matching extension wire is needed, and thermocouples are sensitive to electrical noise
RTDs are devices with an internal resistance that changes with temperature in a linear way. They are typically made from a very fine wire wrapped around a ceramic or glass core, or they can be created using thin film technology. The resistance in the wire will change as the temperature does, and by supplying a constant current, the measured voltage drop across this resistance can be used to determine the temperature. RTDs come in a variety of types, with the most common being a Pt100. It's made from platinum that has been calibrated to be 100 ohms at 0 °C. Platinum is an ideal metal for RTDs because of its stability, resistance to corrosion, and higher melting point. RTDs are great for applications up to around 600 °F.
- Advantages: accurate, repeatable results over the long term
- Disadvantages: have longer response times and are more expensive than thermocouples
For part listings and specifications, go to Shop Now
Probes with Connection Head
Thermocouple and RTD probes with IP66 NEMA 4X connection heads offer measuring ranges from -58 to 2100 °F.
- Type J or K thermocouple elements with bendable probe for easy install
- 3-wire PT100 RTD elements with Class A accuracy
- 1/4" diameter, 316 stainless-steel or Inconel sealed sheath
- 6", 12", or 18" probe lengths
- Cast aluminum screw cover head
- Made in the USA
Starting at
$69.00
(THMK-C06-02)
Spring-loaded Probes with Connection Head
Spring-loaded probes ensure tip contact in thermowells for highly accurate temperature readings. Featuring IP66 NEMA 4X connection heads, these probes offer measuring ranges from -58 to 1700 °F.
- Type K or J thermocouple elements
- 3-wire PT100 RTD elements with Class A accuracy
- 1/4" diameter, 316 stainless-steel sheath
- 4", 5", 6", 7", 12", or 13" probe lengths
- Cast aluminum NEMA 4X screw cover head with captive gasket
- Made in the USA
Starting at
$76.00
(THMJ-C04-03)
Heat Trace Probes with Connection Head
Heat trace probes measure the surface temperature of process pipes to detect freeze-up or to help maintain the viscosity level needed for proper flow of the medium inside. These probes offer measuring ranges from -40 to 900 °F.
- Type J thermocouple element
- 3-wire PT100 RTD elements with Class A accuracy
- 1/4" diameter, 316 stainless-steel sheath for protection in harsh environments
- Flexible mounting weld pad can be formed around pipe sizes from 1" to 12"
- 3" hot leg with 1" x 2" weld pad for mounting to a pipe surface
- 4" cold leg allows for electrical connections outside of pipe insulation
- Cast aluminum, NEMA 4X/IP66 connection head with 3/4" NP conduit opening
- Made in the USA
Starting at
$69.00
(THMJ-HT34-01)
Probes with Hex Nipple
Thermocouple and RTD probes with hex nipples allow easy probe replacement and connection to a junction box. These probes offer measuring ranges from -58 to 2100 °F.
- 316 stainless steel, 1/2 x 1/2" NPT hex nipple
- Type K or J thermocouple elements with bendable probe
- 3-wire PT100 RTD elements with Class A accuracy
- 1/4" diameter, 316 stainless steel or Inconel sealed sheath
- 6", 12", or 18" probe lengths
- Made in the USA
Starting at
$47.50
(THMJ-H06L01-01)
Spring-loaded Probes with Hex Nipple
Spring-loaded probes with hex nipples ensure tip contact in thermowells and allow easy probe replacement and connection to a junction box. These probes offer measuring ranges from -58 to 1700 °F.
- Type K or J thermocouple elements with bendable probe
- 3-wire PT100 RTD elements with Class A accuracy
- 316 stainless steel, 1/2" x 1/2" NPT hex nipple
- 1/4" diameter, 316 stainless-steel sheath
- 4", 6", or 12" probe lengths
- Made in the USA
Starting at
$51.00
(THMJ-H04L01-02)
Probes with Attached Plug
Probes with an attached plug allow for quick and easy plug-in connections. These probes offer measuring ranges from -328 to 1700 °F.
- Type K, J, or T thermocouple elements with bendable probe
- 3-wire PT100 RTD elements with Class A accuracy
- 1/8" or 1/4" diameter, 316 stainless-steel sheath
- 6", 12", or 18" probe lengths
- Made in the USA
Starting at
$24.50
(THMJ-P06-01)
Probes with Lead Wire Transition
Probes with heavy-duty 6 ft. lead wire transitions allow easy connection to RTD or thermocouple extension wire. These probes offer measuring ranges from -328 to 2100 °F.
- Heavy duty lead wire transition with relief spring
- 6-foot lead wires with stainless-steel overbraid
- Type K, J, or T thermocouple elements with bendable probe
- 3-wire PT100 RTD elements with Class A accuracy
- 1/8" or 1/4" Diameter, 316 stainless-steel or Inconel sheath
- 6", 12", or 18" probe lengths
- Made in the USA
Starting at
$38.00
(THMT-T06L06-01)
Probes with M12 Cable Connection
RTD probes with integral M12 cable connections are perfect for attaching mating temperature transmitters. These probes offer measuring ranges from -58 to 302 °F.
- 100 ohm platinum RTD 3-wire element
- Class A accuracy
- 316 SS sheath to protect against harsh environments
- 6mm (0.24") diameter 3-wire RTD element or 10mm (0.4") diameter 4-wire RTD probes
- Probe lengths of 30mm, 50mm, 100mm, 150mm, 160mm, 260mm, 360mm, and 560mm
- Process connections include 1/4" or 1/2" male NPT threads, 3-A approved sanitary CIP tri-clamp, or compression fitting for adjustable insertion depth.
- 4-pin M12 cable connector plug for simplified wiring
Starting at
$35.00
(RTD0100-06-010-H)
Probes with Sanitary Connection
RTD probes with sanitary connections are designed for applications where corrosion and product contamination are factors and are used extensively in the food and beverage industry. These probes offer measuring ranges from -58 to 400 °F.
- 100 ohm platinum RTD 3-wire element
- Class A accuracy
- 1/4", 3/8" reduced to 3/16", or 6mm diameter, 316 stainless-steel sealed sheath
- 4", 30mm, 50mm, 100mm, or 150mm temperature probe lengths
- Models with FDA compliant white thermoplastic screw cover head and captive o-ring seal
- Probes with 3-A approved sanitary CIP tri-clamp and M12 cable connector
Starting at
$109.00
(RTD1-S15-030-H)
Flange Mount Probes
Flange mount probes are ideal for use with ovens, freezers, ducts, or any application where through-the-wall temperature sensing is required. These probes offer measuring ranges from -40 to 900 °F.
- Available with Type J or K thermocouple elements
- 3-wire PT100 RTD elements with Class A accuracy
- 1/4" diameter, 316 stainless-steel sheath
- 6", 12", or 18" probe lengths
- Made in the USA
Starting at
$47.50
(THMJ-F06L06-01)
Cuttable Length Probes
Probes with cuttable lengths provide utmost flexibility and can be trimmed to the required length of a specific application. These probes offer measuring ranges from -40 to 900 °F.
- Type J or K thermocouple elements
- 3-wire PT100 RTD elements with Class A accuracy
- 1/4" diameter, 316 stainless-steel sheath
- 24" probe length can be cut using a basic tube cutter to fit the needs of the application
- Made in the USA
Starting at
$39.00
(THMJ-V24L06-01)
Melt Bolt Probes
Melt-bolt probes measure the melt temperature of plastic as it moves down the barrel of an extruder or injection molding machine. These probes offer measuring ranges from -40 to 900 °F.
- Type J thermocouple element with grounded or ungrounded junctions
- 3-wire PT100 RTD elements with Class A accuracy
- 3" or 6" bolt lengths are available
- Flush, 1/8", 1/4" or adjustable tip lengths available
- 1/2-20 UNF thread process connection
- Made in the USA
Starting at
$49.00
(THMJ-MB3T18-01)
Adjustable Immersion Sensors
Adjustable immersion sensors are designed to be inserted into the medium being measured. Used throughout all industries but ideal for the plastics processing industry. These probes offer measuring ranges from -58 to 900 °F.
- Type J or K thermocouple elements with grounded or ungrounded junctions
- 3-wire PT100 RTD elements with Class A accuracy
- Spring adjustable and armor adjustable styles allow for variable immersion depths
- Integral bayonet cap makes installation and removal quick and easy when used with a bayonet adapter or pipe clamp adapter
- Made in the USA
Starting at
$27.00
(THMJ-D08L04-01)
Bolt-on Ring Sensors
Bolt-on ring sensors feature a ring terminal or washer and are bolt or screw mounted for surface temperature measurements. These probes offer measuring ranges from -58 to 900 °F.
- Type K or J thermocouple elements with grounded or ungrounded junctions
- 3-wire PT100 RTD elements with Class A accuracy
- 316 stainless-steel or brass construction
- 6 ft. lead wires with stainless steel overbraid
- Made in the USA
Starting at
$22.00
(THMJ-B01L06-01)
Threaded Bolt Sensors
Threaded bolt sensors are thread-mounted and feature a 1/4-28 UNF threaded stainless steel rotating bolt for easy installation. These probes offer measuring ranges from -40 to 900 °F.
- Type J or K thermocouple elements with grounded or ungrounded junctions
- 3-wire PT100 RTD elements with Class A accuracy
- Typically used to measure the temperature of the nozzle on an injection molding machine
- Ideal for tight installations such as bearing housings and heat plates
- Made in the USA
Starting at
$30.00
(THMJ-N38P14-01)
Room Sensors
Wall-mount room temperature sensors (indoor ambient air temperature sensor) are appropriate for indoor use in offices, warehouses, manufacturing plant floor space, and walk-in freezers. These sensors offer measuring ranges from -40 to 185 °F.
- ABS plastic ventilated cover
- Metal wall mounting subplate
- Available in thermocouple or RTD versions
- Internal terminal strip for wiring connections
- Can be mounted horizontally or vertically
- Made in the USA
Starting at
$43.50
(THMJ-R01-01)
Spade Sensors
Sensors with a spade tip have a thermocouple or RTD sandwiched between two thin shims of stainless steel or sealed in epoxy between two layers of polyimide tape. The tip can be formed and secured to the outside of various sized tubes, pipes, or nozzles. These sensors offer measuring ranges from -40 to 900 °F.
- Type J or K thermocouple elements with grounded or ungrounded junctions
- 3-wire PT100 RTD elements with Class A accuracy
- Ideal for surface temperature measurement
- Made in the USA
Starting at
$27.50
(THMJ-S01L06-01)
Magnet Mount Sensors
Magnetic-mount thermocouple sensors measure the surface temperature of ferrous materials and are affixed with a convenient and non-destructive magnetic attachment. These sensors offer measuring ranges from of 0 to 600 °F.
- Can be mounted vertically or horizontally
- Type J or K thermocouple elements
- Exposed junction
- Made in the USA
Starting at
$112.00
(THMJ-M01L06-01)
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