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Copper temperature sensors are often used in less critical industrial applications because they are not as accurate as platinum sensors, but their advantage is low cost and linearity.

10Ω copper temperature sensor at 25°C

Copper is considered a material that does not resist well in oxidizing atmospheres. Due to the fact of low resistance and a long period of exposure it could decrease the reading accuracy in oxidizing atmospheres. On the other hand, it is commonly used in many applications free from oxidizing atmospheres.

 

They are usually manufactured with some insulating material for the core, which can be ceramic, epoxy resin with fiberglass, mica, etc.

 

The outer casing can also be PTFE (Teflon), epoxy resin with fiberglass, metal sheath and other materials that can be specified depending on the working temperature of the application.

 

Copper sensors were designed and determined to have a resistance of 10Ω at 25°C and comply with a temperature coefficient of α = 0.00427 Ohms/Ohms/°C.

 

The most commonly used copper sensor tolerance class is ±0.2%.

Applications from -190 to 260°C

The applications can be diverse, although it is commonly used to determine the working temperature in motor and generator stator windings.