I would like to have one display and multiple probes, so that I can switch between the probes and get a reading. I took a close look at the flat temperature probe (thermistor?) of my probe, and it is written "103" on it. I would guess it to be 10*10^3=10K ohm. So I took out some 10K ohm NTS thermistor I have, and measured the resitivity. The values were a bit different. Original Probe - 10.3K ohm Thermistor 1 - 11.2K ohm Thermistor 2 - 11.7K ohm Naturally all three gave different temperature when connected to the display. Room temp was about 26 deg C. Anyway, I got a cup of hot water, placed all 3 probes hanging off the top of the cup (in the way of the steam). Original Probe - 7.xK ohm Thermistor 1 - 4.xK ohm (low 4K) Thermistor 2 - 4.xK ohm (high 4k) This means that the probe is not a normal thermistor? Is there some where I can buy the same probe? Thanks in advance.
It's probably a "normal" thermistor, but a different Beta-value to the others. The Beta-value affects the slope of the temp/resistance curve, so the hard way is to calculate it from a few readings at different temperatures, or find some specs with resistance at two or more temps you could compare. Plenty of links for 102 thermistor, but mostly pdf The 10k is usually at 25C, so it's a better reading than your others though my Senfu is off a few degrees compared to a mercury thermometer.
