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Mineral Insulated RTD-cable

Mineral insulated RTD cables are used in combination with a thin film or wirewound ceramic resistor Pt100 element. The principle of an RTD is that resistance value changes as its temperature changes. RTD pt100 sensors are used to measure temperatures extremely accurate in a certain set temperature range. This range can vary from -200° C to + 850° C. Since the resistors are very delicate, they are often placed in a mineral insulated RTD cable to ensure protection and stability.

Mineral Insulated Thermocouple Cable _ SIDE

Kamet has a large stock of Okazaki mineral insulated RTD cable.

We have an extensive stock (over 200KM) of Okazaki AerOpak® mineral insulated RTD-cable in our warehouse. The Copper, Copper-Nickel, Nickel, nickel-chromium or Constantan alloys in the MI cable provide a stable transmission of the signal and our two different designs (wide-spaced and regular spaced) guarantee efficient mounting for either method. Our mineral insulated RTD cables are typically sheathed with material varying from Inconel to different types of stainless steel.

Types of Mineral Insulated RTD-cable

RTD constantan conductors

Constantan conductors

Mineral insulated RTD cable with constantan conductors is a perfect choice for temperature measurements up to 650°C.

RTD cable Constantan
RTD copper conductors

Copper conductors

Copper conductors have a very stable resistance vs temperature relation

RTD cable Copper
RTD inconel conductors

Inconel conductors

Inconel 600 (2.3816) conductors have a high corrosion resistance

RTD cable Inconel
RTD nickel conductors

Nickel conductors

Due to its higher annealing temperature, RTD cable with nickel conductors can be used at high temperatures.

RTD cable Nickel


Our AerOpak® mineral insulated RTD cables have 2 designs of spacing: wide-spaced (A) and normal (J) spaced conductors. The difference between the two designs is the inner-circle diameter. This allows manufacturers to use different ways of mounting the RTD-element to the inner conductors.

RTD sensor


The thinfilm or ceramic wirewound Pt100 or Pt1000 resistors are usually welded to the inner conductors of a mineral insulated RTD cable. Since the bending process is of mineral insulated RTD cables is easy, the sensor is easily installable at sites with many bends.

Calibration of Okazaki cable

Every single coil of each batch MI cable, manufactured by Okazaki is calibrated to ensure IEC60584-2 class 1, ASTM E230 special limits or AMS2750 E/F. Traceability is assured on every AerOpak® MI cable Kamet has in stock.

Read more about Industry standards

Brochure RTD Cable

To enable our customers decoding the product description, we have created a decipher tool. This tool makes it easier to comprehend the product descriptions of the mineral insulated thermocouple cable. Check our brochure for more information.

Okazaki AerOpak® mineral insulated thermocouple cables


Okazaki has over 60 years of experience in producing mineral insulated thermocouple cable. Besides mineral insulated thermocouple cable, Okazaki also manufactures mineral insulated RTD cables. The mineral insulated RTD cable that Okazaki produces goes under the same trademark as the mineral insulated thermocouple cables: AerOpak®.


Knowledge base

What is the most accurate way of measuring temperature?

The most accurate way to measure temperature is by using a Resistance Temperature Detector (RTD). However, the temperature range of an RTD is limited compared to a thermocouple.
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How to choose the right sensor technology (RTD or TC)

This depends mainly on the temperature range and accuracy. Furthermore, it also depends on other variables, such as costs, ruggedness of the application, vibration resistance, etc.
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Recommended Pt sensors to be used with our AerOpak MI cable

Mineral insulated RTD (resistance temperature detector) cables are used in combination with a thin film or wire wound ceramic resistor Pt100 (PT1000/PT500, etc) element.
Read more…

Do you have a question about RTD cable?

Kamet has many years of experience in the high temperature world. Our specialists are on hand to share their extensive knowledge with you to ensure you select the best sensor for your specific situation.