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Thermocouple Sensors

Thermocouple Sensors


Temperature Sensor Basics


Thermocouples have two dissimilar metal wires joined at the hot junction. As temperature changes, a millivolt signal is read at the cold junction. The most common types of temperature thermocouples are type j thermocouples and type k thermocouples. Advantages of thermocouple sensors include: low cost, small size, wider temperature ranges and faster response than RTDs. The disadvantages of using temperature thermocouples include: they are less linear and accurate than RTDs, a matching extension wire is needed, and thermocouples are sensitive to electrical noise.

Resistance Temperature Detectors (RTDs) have a linear increase in resistance as temperature rises. RTDs come in 2-,3- or 4-wire versions. A 2-wire RTD signal is affected by the distance to the controller. 3-wire or 4-wire RTDs can compensate for line losses.

AutomationDirect offers a variety of industrial thermocouple temperature sensors:


  • Thermocouple Probes (with Connection Head)
  • Thermocouple Probes (Spring-loaded with Connection Head)
  • Thermocouple Probes (with Hex Nipple)
  • Thermocouple Probes (Spring-loaded with Hex Nipple)
  • Thermocouple Probes (with Attached Plug)
  • Thermocouple Probes (with Lead Wire Transition)
  • Thermocouple Sensors (Adjustable Immersion)
  • Thermocouple Sensors (Bolt-on Ring)
  • Thermocouple Sensors (Ambient Air Room Temperature Sensors)

  • Inconel Alloy 600 sealed sheath probes for higher temperature measurements (Type K) up to 2100 F
  • Bolt-on sensors with larger diameter ring
  • ProSense wall-mount room temperature sensors (Thermocouple and RTD types)
  • More thermocouple connectors, thermocouple panel jacks, adjustable pipe clamp adapters, other accessories and extension wire

Probes (with Connection Head)Probes (with Connection Head)

  • Type K or Type J thermocouple elements
  • 1/4" diameter, 316 SS or Inconel sealed sheath
  • Magnesium Oxide (MgO) insulation
  • 6", 12" or 18" probe lengths
  • Bendable thermocouple probe for easy install
  • Cast aluminum NEMA 4X screw cover head
  • Ceramic terminal base - brass terminals with stainless steel screws
Probes (with Hex Nipple)Probes (with Hex Nipple)

  • 316SS, 1/2 x 1/2 NPT Hex Nipple
  • Type K or Type J thermocouple elements
  • 1/4" diameter, 316 SS or Inconel sealed sheath
  • Magnesium Oxide (MgO) insulation
  • 6", 12" or 18" probe length
  • Bendable probe to adapt to installation
Probes (with Attached Plug)Probes (with Attached Plug)

  • Attached plug for quick and easy wiring connections
  • Type K, J or T thermocouple elements
  • 1/8" or 1/4" diameter, 316 SS sheath
  • Magnesium Oxide (MgO) insulation
  • 6", 12" or 18" bendable probe
Probes (with Lead Wire Transition)Probes (with Lead Wire Transition)

  • Heavy duty lead wire transition with relief spring
  • 6-foot lead wires with SS overbraid
  • Type K, J or T thermocouple elements
  • 1/8" or 1/4" Diameter, 316 SS or Inconel sheath
  • Magnesium Oxide (MgO) insulation
  • 6", 12" or 18" bendable thermocouple probe
Sensors (Bolt-on Ring)Sensors (Bolt-on Ring)

Ideal temperature thermocouple for nozzles, extruder barrels, die heads, molds and other surface temperature sensing applications.
  • Type K or Type J thermocouple elements
  • 316 SS or brass construction
  • Grounded or ungrounded junctions
  • 6 foot thermocouple lead wires with stainless steel overbraid
Sensors (Room)Sensors (Room)

Suitable as indoor ambient air temperature sensors.
  • 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
  • Temperature sensing range of -40 to 185F
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