Testing a faulty Thermistor
- Thread starter steved101
- Start date
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turn the power off then test it 
10K at 25c NTC. Drop with temp rise, PTC rise with temp rise!!
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ok ! I know the resistance shoukd change with temperature change, wasn't sure though the best way to test - as some go faulty and not just on open circuit..
So basically - fire boiler up - turn off power, take temperature reading of pipe close to thermstor and check resistance reading.......
So basically - fire boiler up - turn off power, take temperature reading of pipe close to thermstor and check resistance reading.......
yes sounds good!
some only go out of calibration when they heat up, so the boiler might work ok until say it gets to 55c then the boiler might go off because your thermister might read 1k say, even tho it should read 8.5 k for instance
hope that helps
some only go out of calibration when they heat up, so the boiler might work ok until say it gets to 55c then the boiler might go off because your thermister might read 1k say, even tho it should read 8.5 k for instance
hope that helps
ok thanks for that - is a type K thermococuple (with clip on temepartrue sensor) suitable ?
so when testing, if not open circuit, you need to watch the resistance reading doesn't go too low to prove it is faulty?
so when testing, if not open circuit, you need to watch the resistance reading doesn't go too low to prove it is faulty?
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