Hello all,
I am trying to get my old coffeemaker to work after it stopped heating. This is a common issue I think after a few years. We've already bought a new one, so this is strictly for "fun" and to learn a few things. It's a KRUPS KM720 that I always liked. I've already bought two thermal fuses to replace the old ones : Microtemp G4's rated at Tf = 184 C. I'm pretty sure they were identical, placed on either side of the heating element.
My problem now is replacing the small NTC thermistor (glass-encased bead type), which is placed against the element (with some white stuff in between, for thermal conductance ?) and looked very much like these :
http://www.ces-eshop.com/dir/image/cache/data/vnnew/ntc-500x500.jpgUnfortunately I've lost the old one, but before that I was able to measure its resistance at between 10k and 20k Ohms (at room temperature). However at the electronics store, one guy measured it at 100 kOhms on his multimeter. But we were wrongly assuming at that time that it was a zener diode (which can look quite similar except for the black band at one end, not present in my case), so his measurement may have been at the wrong setting.
My question is: does anyone know what specs would make sense to replace the NEC thermistor in this coffee maker? From what I understand, the two parameters are resistance at room temp (25 C) and the B / beta which characterizes the rate of change versus temperature change. From what I see on e.g. Amazon, the most common specs are 10 kOhms and beta = 3950. But of course the original design could have called for different specs.
Thanks for any advice.