Hello All,

I want to interface the PT 100 to meshnetics module(Zigbee wireless platform).
This module has inbuilt ADC.
Its 3 wire PT100
The temperature range is -20 ºC to 400 ºC.
Right now I am using Wheatstone bridge with INA326 instrumentation amplifier.
This works well with Range of 0ºC to 400 ºC
So, What changes should I made to measure negative temperature?

Regards,
Anujaa

 

Can you state the problem you are having? Is the signal from the INA a problem? We would need a schematic to have some idea of the circuit.

 

This link to a Maxim Integrated Products appnote might be helpful in your quest for answers

 

Hello
its just interconnection of brige and instrumentation amplifier

 

You won't be able to read negative temperature directly with a single supply amplifier. You'll either need an old-fashioned dual supply amp or you'll need to offset the output from your bridge.