Read raw mV value from DrDAQ's pH channel from the SDK

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MaximeDL
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Joined: Thu Mar 25, 2021 2:22 pm

Read raw mV value from DrDAQ's pH channel from the SDK

Post by MaximeDL »

Hello,

Is it possible to retrieve the raw mV value from the pH channel of a DrDAQ from the SDK?

I'm writing my own C# application and need access to the raw mV value from a pH probe connected to he pH channel, not the pH calculated by the DrDAQ.

Thank you,
Maxime

Gerry
PICO STAFF
PICO STAFF
Posts: 923
Joined: Mon Aug 11, 2014 11:14 am

Re: Read raw mV value from DrDAQ's pH channel from the SDK

Post by Gerry »

Hi MaximeDL,

Last time I checked, this was done in the Driver (in order to provide Temperature compensation based on the sensed connection of the DD100 Temperature sensor to the relevant input channel). That was for PicoLog 5, but I wouldn't expect that to be different for PicoLog 6.

However, one of our users has written a post on how to perform very accurate pH measurements, including getting accurate mV values from the pH sensor, which I would encourage you to look at here: topic27111.html. He also, includes the ability to compensate for temperature with an alternative (low mass NTC sensor) to the DrDaq standard DD100 sensor.

When using the pH sensor you are advised to re-calibrate it for any kind of usable accuracy (in the DrDaq User Guide) so you may as well use the procedure, suggested in the link, to create a function or table that provides an accurate conversion, which you can then add a 'calibration' function to.

Regards,

Gerry
Gerry
Technical Specialist

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