Main Site Documentation

Temperature E-Block with another Thermistor


#1

Does anyone have experience using a different thermistor with the Temperature E-Block? I need to be able to measure temperatures up to 110C. The maximum limit for the thermistor supplied with the Temperature E-Block is 54C. Has anyone tried replacing the original thermistor with another one?

Since I’d like to understand the E-Block better, I’d like to look at the schematic. I’m new to the Fez but I understood it was all open source. Could someone point me to the schematics for the E-Blocks?

Thanks to all for any help.


#2

You’d probably be changing the other resistor on the e-block, not the thermistor. Maybe. I don’t know a lot about thermistors, but 110C seems like a lot.

Maybe you should look into a thermocouple?


#3

Glass bead thermometers can handle up to 300C. One important parameter is the resistance of the thermistor. Since I don’t know any specs for the one on the E-Block, I don’t know whether or not the resistor will work, nor do I know if simply changing it would be sufficient.

Hmm. Looks like what I really need is the schematic and parts list. But any experience anyone has had with other thermistors would be helpful also.

Thanks for the response!


#4

There’s a formula out there to determine (some of) the specs for a thermistor, but I don’t know it, and I don’t remember what it’s called.

Other than that, the E-Block may have come from inexglobal, so they may have more information.


#5

Remember at that kind of temperature, your bigger concern may well be your plastics etc. What is the application you’re looking at? Like @ godefroi suggests, thermocouple might be better (and at least you get yourself some distance :))


#6

Thanks for the helpful replies!

Yes, there is a formula. But you have to know what model thermistor you’re dealing with to know which formula to use, as I understand it.

Noting about E-Blocks is mentioned on the Inexglobal site - and there is no search capability. Googling for info leads to TinyCLR/GHI.

Note that I’m only concerned with temperatures around boiling - nothing excessive here. Most plastics handle this just fine.

The application is a heated bed controller for a RepRap 3D Printer.


#7

Is it the SCI-BOX Temperature Sensor, shown here:

http://inexglobal.com/products.php?type=SCIENCE&cat=SCIENCE&model=Sciencesensors

If so, inexglobal may have information on it.


#8

Here is the device I’m using:
http://www.ghielectronics.com/catalog/product/156

Sorry I didn’t post this earlier.


#9

No, that’s not the same at all. GHI would need to chime in here and provide information on the thermistor.