0
\$\begingroup\$

I purchased this cigarette lighter unit that is a voltage meter, temperature sensor, and USB charger. The temperature sensor appears to be on a wire lead that comes out of the case.

I took apart the unit and its construction is very simple. I can solder to the circuit board if need be. What type of thermistor does this unit likely use? How far can I extend the leads of the temperature sensor and have the unit continue to give an accurate reading?

enter image description here

enter image description here

\$\endgroup\$
  • \$\begingroup\$ Are you sure it's a thermocouple and not a thermistor? (Measure its resistance.) \$\endgroup\$ – ThreePhaseEel Aug 26 '17 at 15:56
2
\$\begingroup\$

In a consumer product such as this, the "thermocouple" is "likely" to be a thermistor. A thermistor are just a temperature sensitive resistor, so you can solder extension wires to it without any adverse effect. Their resistance is normally in the kilo-ohm range, so don't worry about the resistance of the wires.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.