Mineral Insulated RTDs

Learn more about our Mineral Insulated RTDs

Special Options

All our mineral insulated resistance thermometers are custom made, as such we are able to tailor your sensors exactly to your requirements. There are many options available including:

Element Options

Pt100 B as standard with Pt100 A, 1/3,1/5,1/10 DIN, Pt 50, Pt 500, Pt 1000 and Pt 2000 available on request.

Process Fittings

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


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


Resistance thermometers can be supplied duplex instead of simplex.

Material Certificates

Material certificates are available on request.

Reduced tip options

Reduced hot junction for fast response or cost saving.

High Temperature Versions

High temperature options for plugs, sockets and cable can be supplied.


Your own serial, product number or other information attached to sensors via heat shrink cable or metal tags.

Wire Configuration

3 wire as standard, marked red/red/white, with 2 or 4 wires on request.

Bent to shape

MI RTDs can be bent to any shape to fit your process or application.

UK Manufactured Mineral Insulated RTDs

We manufacture and design mineral insulated resistance thermometers. Resistance thermometers are often called platinum resistance thermometers (PRTs), resistance thermometer detectors (RTDs) or simply Pt100 sensors. Mineral insulated resistance thermometers consists of an external metal sheath which protects the P100 element from damage and contamination. This outer sheath is insulated with magnesium oxide powder, tightly packed so no air is trapped inside. This not only gives great thermal conductivity but mineral insulated RTD can be bent into a variety of shapes to suit your application.

Made to your specification

There are a wide range of options for our MI resistance thermometers. They can be constructed with various diameters and materials of sheath, many different RTD types (Pt100, Pt1000 etc) and with our laser welder, mineral insulated RTD lengths are practically limitless.

Need some help?

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

Contact us

We’ve made mineral insulated resistance thermometers for over 25 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 to get the right sensor for your process.

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