PT 100 3 interfacing

Thread Starter

anujab9

Joined May 16, 2008
4
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
 

beenthere

Joined Apr 20, 2004
15,819
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.
 

thingmaker3

Joined May 16, 2005
5,084
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.
 
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