Connecting DrDAQ to a Pt100

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Bosham
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Connecting DrDAQ to a Pt100

Post by Bosham » Thu Jan 14, 2010 1:46 pm

How do I go about connecting a Pt100 (2-wire) to a DrDAQ?

PeterF
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Re: Connecting DrDAQ to a Pt100

Post by PeterF » Fri Jan 15, 2010 9:07 am

Hi,
That is not a sensible combination. A PT-100 sensor is too low a resistance and varies in resistance by too little. The DrDaq will be unable to get stable temperature readings from it. Please use the standard DrDaq thermistor. If that does not have enough temperature range, you will need to choose another data logger.
Regards,
PeterF.

Bosham
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Re: Connecting DrDAQ to a Pt100

Post by Bosham » Sat Jan 16, 2010 3:47 pm

Hi Peter,

Many thanks for the advice. I rigged up a thermistor( not a DrDAQ one, though) as suggested and it works fine. I've used the voltage i/p on the side of the DrDAQ but I wonder whether it would be better to use the proper i/p socket?

Regards,

David.

PeterF
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Re: Connecting DrDAQ to a Pt100

Post by PeterF » Tue Jan 19, 2010 4:02 pm

What you have done is the best way. If you use the DrDaq thermistor input you will need to use the official DrDaq thermistor which has an identification resistor incorporated.
PeterF.

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