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Temperature Measurement · Glossary

What is Mineral Insulated Cable?

Symbol: MIsheathed thermocouple or RTD cableTemperature Measurement

Mineral insulated cable has sensor wires packed in compressed magnesium oxide inside a metal sheath; it is used to make robust, bendable sensors.

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Mineral Insulated Cable Explained

MI thermocouples and RTDs withstand high temperature, pressure and vibration, and can be bent to follow the process. Small diameters give fast response.

Sheath material is chosen for temperature and corrosion, such as 316 stainless steel or Inconel 600.

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Calculators for Mineral Insulated Cable

CalculatorSensor Response Time CalculatorFree online calculator with formula and worked example.CalculatorThermocouple CalculatorFree online calculator with formula and worked example.

Frequently Asked Questions

What is Mineral Insulated Cable?

Mineral insulated cable has sensor wires packed in compressed magnesium oxide inside a metal sheath; it is used to make robust, bendable sensors.

Can MI cable be bent?

Yes, to a minimum radius of a few sheath diameters; check the maker data.

Why does MI insulation fail?

Magnesium oxide absorbs moisture if the end seal fails, reducing insulation resistance.

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