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Capturing PT-104 Data

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Capturing PT-104 Data

Postby achesterton » Wed Apr 19, 2017 9:01 am

Hi Everybody,
I'm relatively new to using the Pico Technology kit, so sorry if this topic has been covered elsewhere, or is something really basic to achieve. I've try to look through the topics, but have had issues searching the forum this morning.

I am using a PT-104 with 2 sensors connected.
Ch.1 is a known 3-wire PT-100 sensor, logging temperature in Deg. C
Ch.2 is a 2-wire temperature sensor with an unknown resistance curve, logging resistance in the 0-10K range.

What I am trying to do is get Picolog to capture the resistance of Ch.2 at various Degree C intervals based on the reading from Ch.1.

Is this possible, and if so how?

Thanks in Advance
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Re: Capturing PT-104 Data

Postby Gerry » Mon Apr 24, 2017 10:33 am

Hi achesterton,

Yes, what you ask is possible. If you want to determine the resistance vs temperature variation of the temperature sensor on channel 2, you can do this to within the accuracy of the measurement setup/method that you are intending to use (which will include, among other factors, the uncertainty of the PT-100 sensor + data Logger). What you would need to do is apply a reasonably linear stepped change in the temperature of the environment for both sensors, while logging the data as temperture versus resistance over the test temperature range.

First, I would recommend running through the guided Tour of Our PicoLog software (which can be found under the help menu) to familiarize yourself with it's operation. You can then set the channel for the PT100 to 4-wire PT100, and the unkown sensor to 2-wire and Resistance 0.10K, in the Edit PT104 Channel window (which you can get to by double clicking on a channel, in PicoLog). Then finally you can create a data file and start the data recording process in PicoLog while you increment the temperature of your test envvironement.

For highest accuracy i would recommend looking at our guide to "Improving the accuracy of temperature measurements" here: https://www.picotech.com/library/applic ... asurements. Then, you should use a well controlled environment (preferably a homogenous liquid bath, with minimal thermal gradients, or failing that, an air heated environment that is draft excluded, such as an oven, and precise enough temperature control, with a long enough dwell at the measurement points).

Regards,

Gerry
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Gerry
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