Noggin
Member
I'm in need of some food grade temperature probes. I purchased some replacement probes for a DTTC thermometer and planed on using them for a project, but I can't seem to figure out their curve. I made an Excel spreadsheet that generates resistance values for different temperatures a while back. The spreadsheet is based on the Steinhart-Hart equations and has worked well in the past for characterizing thermistors, but it chokes on these DTTC probes.
The data I've gathered on these probes is 445000 ohms at 5.6°C, 285000 ohms at 20.6°C and 24500 ohms at 88.9°C.
Are there any thermistors that, for lack of a better word, don't "thermist" in some temperature ranges? Do I need to get temperature/resistance values at higher temperatures?
As an alternative, does anyone have a good, low cost source, for food grade thermistors? I've had a difficult time finding anything from a good source. Coming with a datasheet (or at least a known beta) would be an awesome plus.
The data I've gathered on these probes is 445000 ohms at 5.6°C, 285000 ohms at 20.6°C and 24500 ohms at 88.9°C.
Are there any thermistors that, for lack of a better word, don't "thermist" in some temperature ranges? Do I need to get temperature/resistance values at higher temperatures?
As an alternative, does anyone have a good, low cost source, for food grade thermistors? I've had a difficult time finding anything from a good source. Coming with a datasheet (or at least a known beta) would be an awesome plus.