Temperature sensors are available in a wide range of probe, installation, and sensing styles. Thermocouples are made from two dissimilar metals joined at a hot junction and generate a millivolt signal as the temperature changes, while RTDs and thermistors exhibit a change in their resistance.
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The most commonly used temperature sensors in the automation industry are thermocouples, resistance temperature detectors (RTDs), and thermistors.
Thermocouples work based on the Seebeck effect, where a small voltage is produced across a junction of two dissimilar metals exposed to a temperature gradient. The thermocouple voltage is small, usually millivolts, and is directly related to the temperature difference across the junction. Thermocouples have a low cost, small size, wider temperature ranges, and faster response times than RTDs, but they are less accurate, are sensitive to electrical noise, and require a matching extension wire.
RTDs are devices with an internal resistance that varies with temperature in a linear way. They are typically made from fine wire wrapped around a ceramic or glass core or can be created using thin film technology. When a constant current is applied, the voltage drop across the resistance can be used to determine the temperature. RTDs have accurate, repeatable results over the long term but have longer response times and are more expensive than thermocouples.
Thermistors are sensitive, temperature-dependent resistors made from metal oxide semiconductors. The specific combination of metal oxides determines their unique temperature-dependent resistance characteristics. They are accurate, have fast response times, a compact size, and low cost, but have a limited temperature range.
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ProSense adjustable immersion probes are designed to be inserted directly into the measured medium. They are used throughout all industries but are ideal for the plastics processing industry. These probes offer measuring ranges from -58 to 900 °F.
Starting at
$27.00
(THMJ-D08L04-01)
Newest Additions!
ProSense probes with an attached plug allow for quick and easy plug-in connections. These probes offer measuring ranges from -328 to 1700 °F.
Starting at
$24.50
(THMJ-P06-01)
New!
The ProSense bead probe is a miniature sensor adaptable to restricted space applications. It includes a 6-foot cable pre-stripped for easy connection to the monitoring device and offers measuring ranges from -40 to 257 °F.
Priced at
$23.50
(NTC10K3-BR01L06-01)
Newest Additions!
ProSense bolt-on ring probes 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.
Starting at
$21.50
(THMJ-B02L06-01)
Newest Additions!
ProSense thermocouple, thermistor, and RTD connection head probes combine the sensing element with a protective housing that encloses the wires and connections. Spring-loaded probes ensure tip contact in thermowells. These probes offer measuring ranges from -58 to 2100 °F.
Starting at
$67.00
(NTC10K3-C06-02)
Newest Additions!
ProSense cuttable probes 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.
Starting at
$39.00
(THMJ-V24L06-01)
Newest Additions!
ProSense 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.
Starting at
$37.50
(NTC10K3-F06L06-01)
ProSense 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.
Starting at
$69.00
(THMJ-HT34-01)
Newest Additions!
ProSense thermocouple, thermistor, 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. Spring-loaded probe options ensure tip contact in thermowells for highly accurate temperature readings.
Starting at
$47.50
(THMJ-H06L01-01)
New!
ProSense thermistor junction box probes feature a sensing element attached to a galvanized box with knockouts for convenient connection to conduit and other electrical connectors. Spring-loaded probes ensure tip contact in thermowells. These probes offer measuring ranges from -40 to 257 °F.
Starting at
$51.50
(NTC10K3-JB06-02)
Newest Additions!
ProSense probes with heavy-duty 6 ft. lead wire transitions are adaptable to a variety of applications and allow easy connections to extension wire. These probes offer measuring ranges from -328 to 2100 °F.
Starting at
$33.50
(NTC10K3-T06L06-02)
ProSense RTD probes with integral M12 cable connections are perfect for attaching mating temperature transmitters. These probes offer measuring ranges from -58 to 302 °F.
Starting at
$40.50
(RTD0100-06-010-H)
ProSense magnetic-mount thermocouple probes measure the surface temperature of ferrous materials and are affixed with a convenient and non-destructive magnetic attachment. These sensors offer measuring ranges from 0 to 600 °F.
Starting at
$112.00
(THMJ-M01L06-01)
ProSense 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.
Starting at
$49.00
(THMJ-MB3T18-01)
ProSense RTD probes with sanitary connections are designed for applications where corrosion and product contamination are factors. They are used extensively in the food and beverage industry and offer measuring ranges from -58 to 400 °F.
Starting at
$109.00
(RTD1-S15-030-H)
Newest Additions!
ProSense spade probes have a sensing element sandwiched between two thin shims of stainless steel or sealed in epoxy between two layers of polyimide tape. Their tip can be formed and secured to the outside of tubes, pipes, or nozzles. These sensors offer measuring ranges from -40 to 900 °F.
Starting at
$27.50
(THMJ-S01L06-01)
Newest Additions!
ProSense threaded bolt probes are thread-mounted and feature a 1/4-28 UNF threaded stainless steel rotating bolt for easy installation. They offer measuring ranges from -40 to 900 °F and are typically used to measure the nozzle temperature of an injection molding machine without being in direct contact with the molten plastic.
Starting at
$30.00
(THMJ-N38P14-01)
Newest Additions!
ProSense wall-mount room temperature probes (indoor ambient air temperature sensors) 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.
Starting at
$28.25
(THMJ-R01-02)
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