What type is this copper temperature sensor?
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At room temperature, it’s over 2200 ohms; this is the temperature measurement point of the Sanyo refrigeration unit
The temperature sensor you are referring to, which is made of copper and has a resistance of around 2200 ohms at room temperature, is likely an NTC thermistor (a type of temperature sensor with a negative temperature coefficient). The temperature sensing elements commonly used in Sanyo refrigeration units are mostly of the NTC type, with their resistance value decreasing as the temperature rises. .