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Thermocouples – Precision Temperature Measurement Solutions

Caldor Heat Engineering supplies high-quality thermocouples, engineered for accurate and reliable temperature measurement in demanding industrial environments. Thermocouples are essential temperature sensors that convert temperature differences into a measurable electrical signal, enabling precise thermal monitoring across a wide range of applications.


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A thermocouple is a robust temperature sensor consisting of two dissimilar metal wires joined at a measuring junction. When exposed to temperature differences, the junction generates a voltage proportional to the temperature, which can be interpreted for accurate temperature measurement. Thermocouples are cost-effective, durable, and suitable for a broad temperature range, making them widely used in industrial processes, scientific equipment, and control systems.

Key Features

  • Wide Temperature Range – Capable of measuring from low to very high process temperatures, depending on configuration.
  • Fast Response – Rapid thermal response supports real-time process control.
  • Robust and Reliable – Durable construction makes them suitable for harsh industrial environments.
  • Cost-Effective – Low-cost sensor solution with long service life and minimal maintenance needs.
  • Versatile Use – Compatible with various industrial sectors and temperature control systems.

Applications

Thermocouples supplied by Caldor Heat Engineering are used in a wide range of industrial applications, including:

  • Industrial furnaces and kilns

  • Extrusion and plastics processing

  • Oil, gas, and energy systems

  • Chemical and process automation

  • HVAC and environmental control

  • Laboratory and test equipment

Thermocouple Categories

Caldor Heat Engineering offers a comprehensive range of thermocouple types and configurations, including but not limited to:

  • Mantel Type Thermocouples – Standard sheathed sensors for general industrial use.

  • Metal Tube Sheathed Thermocouples – Enhanced protection for demanding environments.

  • Bayonet and Screw Type Thermocouples – Designed for insertion into process ports.

  • Headed Thermocouples – Thermocouples with connection heads for robust electrical interfacing.

  • Ceramic Tube Thermocouples – Suitable for ultra-high temperature applications.

  • Custom Configurations – Tailored designs based on application requirements.

Thermocouples – Bayonet, Screw-In & Mould Type Assemblies

Caldor Heat Engineering manufactures custom thermocouple assemblies for accurate temperature measurement in plastics machinery, extrusion, injection moulding and general process heating. Select your assembly type below.

Bayonet Thermocouples Screw-In Thermocouples Mould Type Thermocouples

Bayonet Thermocouples

Overview

Bayonet thermocouples are widely used in extrusion and plastics processing where compact installation and quick replacement are required. They typically use a twist-and-lock bayonet fitting with spring-loaded tip pressure for stable contact at the measuring point.

Typical Applications

  • Extruder barrels and cylinders
  • Injection moulding machines
  • Hot runner plates and manifolds (application dependent)
  • Packaging machinery and heated process blocks
Technical Options
  • Thermocouple types: J / K / N / E / T
  • Max temperature: construction dependent, up to ~1250 °C
  • Bayonet caps: single-slot / double-slot; optional locking styles
  • Spring: length and compression tailored to installation depth
  • Termination: standard / mini connectors, tails, extension cable
What We Need From You (Fast Quotation)
  • Bayonet style (single/double slot) and adaptor/thread (if applicable)
  • Insertion length + spring length
  • Type (J/K/N/E/T), junction (grounded/ungrounded/exposed)
  • Lead length and termination (mini/standard/tails)
  • Operating temperature and environment

Screw-In Thermocouples

Overview

Screw-in thermocouples provide a secure threaded process connection for direct measurement in ports, manifolds and machine blocks. They are configured to match thread standards, insertion depths and sealing requirements.

Typical Applications

  • Process ports on machinery and industrial heating equipment
  • Manifolds, blocks and heated assemblies
  • General process measurement where robust mounting is required
Technical Options
  • Thread standards: Metric (M…), BSP (G…), NPT
  • Junction: grounded / ungrounded / exposed (application dependent)
  • Sheath: stainless steel or high-temperature alloys (as required)
  • Sealing: gasket/washer, metal-to-metal or application-specific sealing
  • Termination: connector head, mini/standard plug, tails, cable
What We Need From You (Fast Quotation)
  • Thread type/size and sealing method
  • Insertion length + probe diameter
  • Type (J/K/N/E/T) and required operating range
  • Lead length and termination style
  • Media/environment (oil, air, polymer, etc.)

Mould Type Thermocouples

Overview

Mould thermocouples are designed for compact installation where fast response and limited space are critical—typically within mould tools, hot runner plates and heated zones. Geometry, tip style and lead routing are engineered to the tool.

Typical Applications

  • Injection mould tools
  • Hot runner plates and compact heated assemblies
  • Process blocks requiring small tips and fast response
Technical Options
  • Tip styles: standard / reduced / fast-response (application dependent)
  • Small diameters: engineered to fit tool pockets and channels
  • Lead protection: spring strain relief, braided protection (as required)
  • Termination: mini connectors, tails, extension cable
  • Custom builds: based on tool drawing or sample
What We Need From You (Fast Quotation)
  • Tool pocket depth and available space (drawing/photo)
  • Required tip style and insertion depth
  • Type (J/K/N/E/T) + required response priority
  • Lead routing constraints and termination preference
  • Operating temperature and cycles

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