Platinum & Rhodium Thermocouple (Rare Metal)

UK Manufactured Rare Metal Thermocouples

We manufacture and design rare metal thermocouple assemblies. Rare metal thermocouples are made from conductors containing platinum and rhodium alloys and are suited for measuring high temperatures up to +1700°C. They are a rugged design, suited for tough industrial use.

Rare Metal Designs

The rare metal sensor will need contamination protection from the process it is measuring. Each thermocouple should have a protection sheath best suited to its application.

Common designs are:

If you are unsure exactly what you need, get in touch and we can help identify your requirements.

Rare Metal Thermocouple Assembly with Ceramic Sheath

The sensor can be protected by a ceramic sheath. There are a variety of ceramic sheaths available each with its own properties.


Rare Metal Thermocouple Assembly with Metal Sheath

The sensor can be protected by a stainless or metal alloy sheath. These types of designs are often used in cement works or incinerators.


Rare Metal Thermocouple Assembly with Platinum Thimble

The sensor can be protected by a ceramic sheath with a platinum thimble at the hot end. This design is often used in container glass forehearths to take uniformity measurements but can be applied to other applications if suitable.


Rare Metal Thermocouple Assembly with Full Platinum Thimble

If required the sensor can be protected by a full length platinum thimble. It is a more robust design of the Rare Metal Thermocouple Assembly with Platinum Thimble.

Rare Metal Triplex Thermocouple

Rare Metal Thermocouple Types

There are three types of rare metal thermocouple all made from alloys of platinum and rhodium with slightly different characteristics and specifications.

Type R & Type S Thermocouple

UK and European Standard.

Type B Thermocouple

Very high max temperature.

Special Options

All our rare metal thermocouples are custom made, as such we are able to tailor your sensors exactly to your requirements. There are many options available including:

  • Special materials

    Materials which would work best in your process are available on request.

  • Special coatings

    Wear and chemical resistant coatings can be applied to sensors e.g. ACT™.

  • Calibration

    Full UKAS or UKAS traceable calibration is available. AMS 2750 F to full or traceable calibration is available.

  • Material Certificates

    Material certificates are available on request.

  • Cabling

    High temperature compensating cable can be supplied fitted to sensor.

  • Pressure testing/tight

    Pressure testing can be conducted and pressure tight designs are available.

  • Lining sheaths

    Ceramic lining sheaths can be added to increase heat resistance.

  • Process Fittngs

    Flange or compression fittings can be added such as an adjustable or welded flange on shank

  • Duplex & Triplex

    Thermocouples can be supply duplex or triplex instead of simplex.

  • Reduced tip options

    Reduced hot junction for fast response or cost saving.

Contact us

We’ve made rare metal thermocouples for over 15 years and today we are considered the best choice for custom built temperature sensors in the UK. We continue to apply our expertise and invest in the latest technology to provide our customers with the highest quality temperature sensors available.

Contact us with your requirements if you have an existing sensor design or are unsure what you need we’ll be able to find you get the right sensor for your process.