The sensor utilizes a precision thermistor that has been potted in a solid bronze rod, bored to accept the thermistor in its very end, along with potted wiring. The thermistor is a solid-state device that changes its resistance inversely proportional to temperature from 150,000 Ω at the low end, to 1500 Ω at the high end.

The sensor utilizes a precision thermistor that has been potted in a solid bronze rod, bored to accept the thermistor in its very end, along with potted wiring. The thermistor is a solid-state device that changes its resistance inversely proportional to temperature from 150,000 Ω at the low end, to 1500 Ω at the high end.