Electronics > Projects, Designs, and Technical Stuff
Temperature sensor technology
Niklas:
This manual in German is not from the B48, but from a similar equipment also produced by 2E:
https://pitec.ch/media/wysiwyg/technische_informationen/B11-Pitec_-_de.pdf
Page 8 and forward might be of interest.
Most of the info about 2E's water mixer equipment seems to have an adjustable temperature in the range of 0-60'C with 1'C resolution, so your mystery sensor is most likely not a bimetallic switch. If it were a thermocouple, then you would have special wires and connectors, not that kind of screw terminals marked as 762 on page 10.
The different error indications on page 8 can also give some clues if the B48 has similar indications. The two t messages at the bottom indicates high temp/sensor open circuit and low temp/short circuit. If you can get a temperature reading form the display, then you can also use that to figure out what sensor type and resistance the mystery sensor was. NTC resistance is given at room temperature and Pt100/Pt1000 at 0'C. I would have tried with standard resistance values like 47k, 22k, 10k, 4.7k, 2.2k, 1k etc and watched the output on the display. Map the indicated temperature and sensor resistance and look at the resistance at 0'C and 20'C to decide whether it is Pt100/Pt1000 or NTC.
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