PTC Thermistors?

Can anyone tell me what type/standard do PTC thermistors follow commonly
found in motors in the UK.
Also, is there a calculator available online or for download for these
thermistors.
I have a submersible pump and the resistance is measured at 148 Ohms. I
assume there are three thermistors in the motor connected in series.
I would like to know the winding temperature from measuring thermistor
resistance, not just for this pump, but for all motors with thermistors at
our sites.
TIA
Reply to
BIGEYE
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