| Electronics > Beginners |
| Temperature probes PT100 / K type accuracy/calibration |
| (1/1) |
| cowasaki:
I have a couple of cheap Chinese stand alone temperature measuring devices using K types, a K type on my uni-t 60 DMM and I've just bought a 3 wire PT100 which I've wired up as four wires and connected to my Keighley 6100..... The PT100 reads 21 at room temp & 35 against skin (both about right) but 190 against my soldering iron tip which is supposed to be at 290. The two Chinese stand alone are about 5% out from each other. They all read different values. How do people check them? How can you calibrate them? I could try for 100 degrees using the kettle but not many other repeatable temps. |
| Kleinstein:
The soldering iron temperature is not at all an accurate point. Here it really depends on the thermal contact. +-10 K is considered good for a soldering iron. Boiling water is a much better reference point. Meting ice is another. For the 35-45 C range there are rather good medical thermometers. The meting point of pure zinc is another (even official) test point - though not really easy to use. Pt100 sensors often only need a 1 or 2 point check. |
| cowasaki:
I'm going to bring the Keithley and the cheapo Chinese K type thermometers into the kitchen tomorrow and check the 100C point with all three. I wanted the PT100 as accurate as possible as I wanted to use that to effectively calibrate some thermometers for home automation etc.... |
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