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PT100 sensor for measuring liquid resin, fully submerged

Electrical Engineering Asked by Sanchit Agarwal on October 29, 2021

Edited

Link to Pt100 sensor (That’s the best i could do)

https://www.intech.co.nz/products/temperature/mrh.html

Link to ESP8266 datasheet

http://www.handsontec.com/pdf_learn/esp8266-V10.pdf

Original

First of all, I am bit of a noob in electronics so i beg your forgiveness.

So i have a question. I have a manufacturing process where we “melt” resin into liquid form and i want to keep track of the temperature (range probably about 100-200 ‘C ) in an IOT way (Web dashboard, MQTT).

I am thinking of using a 3 wire PT100 with a ESP8266 Nodemcu using wheatstone bridge configuration. The sensor i am thinking of using will look something like this

enter image description here

Questions:

  1. The equipment on which i will be fitting this sensor will be essentially a very large vessel and most probably there will be chances of the whole probe getting submerged in the liquid resin. How this will effect my reading ? Can this create complications or even damage the probe.

  2. I am not able to find a circuit schematics for a 3 wire Pt-100. I will be really glad if somebody could literally spoon-fed me on how to make the circuit.

Thanks !!!

One Answer

enter image description here

Found this on Bing. The opamps are obviously r-r and low voltage so they would not be easy to substitute. You may or may not want to calibrate this depending on the accuracy you need.

https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0337.pdf

Answered by Robert Endl on October 29, 2021

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