Proper way to measure thermistor

Any hardware type questions or problems for all other Phidget devices.
Rhybot
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Proper way to measure thermistor

Postby Rhybot » Fri Nov 08, 2019 5:21 pm

Hello Phidget Forums,

I have a 2-wire 2252 Ω thermistor, and am trying to use Phidgets to measure the thermistor's temperature.

I have the TMP1200_0 Phidget right now. I wired it like a 2-wire RTD (per the TMP1200_0's User Guide), with:
1. EXC+ jumpered into RTD+
2. EXC- jumpered into RTD-
3. Thermistor+ going into RTD+ as well
4. Thermistor- going into RTD- as well

Via the ResistanceInput API, I set the RTD type to be RTD_WIRE_SETUP_2WIRE.

Is this the proper way of measuring a 2-wire thermistor? Is there a better Phidget I could be using, or a more standard wiring method?

Just checking, it's not super explicitly stated in the TMP1200_0's User Guide.

KUROCHAMAME
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Is it possible to connect 2 or more TMP1200s and record with Artisan?

Postby KUROCHAMAME » Fri Nov 08, 2019 6:24 pm

I have a 4-channel Phidgets 1048 already but I would like to change the device to 2 or more of the Phidgets TMP1200s to avoid noise coming from the moters.
Is it possible to connect two of more of the TMP1200 to the Vint Hub and use it with Artisan?
Do I need to buy some special probes for the TMP1200?
Or simple K type probe is OK on the TMP1200?

jdecoux
Labview Developer
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Re: Proper way to measure thermistor

Postby jdecoux » Tue Nov 12, 2019 4:16 pm

@Rhybot - Yes, that sounds like the proper way to measure a thermistor with Phidgets.

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@KUROCHAMAME - The TMP1200 is an RTD/resistance Phidget. It is not intended to measure thermocouples, but instead for use with RTD probes. You can find RTD probes linked in its product page under Connection and Compatibility.

It sounds like you could be looking for the TMP1100 Isolated Thermocouple Phidget, which will use K-type thermocouple probes. Yes, you can connect multiple TMP1100 (or any VINT Phidget) to the same VINT Hub. I cannot speak to how these are used with third-party software such as Artisan.


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