I am trying to repair several reasonably expensive pieces of equipment (ABI Veriti thermocyclers) in our lab which report the same error. They were all bought at the same time and must have a bad batch of components (they failed immediately after the warranty period).
I believe I have tracked the issue down to a failed thermistor. ABI (now ThermoFisher) will not sell me the part or tell me the specs.
The specs I have ascertained (on a good component) with a lab thermometer and multimeter are:
- Radial PTC
- 1.1kohm @25°C
- 1.293 @ 76°C
- Beta(k) ??
- Length: 5mm
- Diameter: 2.1mm
- Shape: cylindrical
A slightly smaller diameter is probably OK but larger will not fit in the orifice machined into the heat sink.
I can not find anything even vaguely close to this on Mouser or a couple of other sites I have tried.
Any suggestions would be appreciated. We're a cancer research lab if that info motivates you.