Ion selective electrodes DrDaq

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Pimentel
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Joined: Wed Mar 13, 2019 11:54 am

Ion selective electrodes DrDaq

Post by Pimentel » Wed Mar 13, 2019 12:06 pm

Hello everybody,
I would like to use a ion selective electrode Kwikcal-2 to measure the Ca composition variations in the DrDaq datalogger. This electrode requires the use of the BNC pH port and to measure in mV. Furthermore, it requires a reference electrode (Dri-ref-450) to be connected on the datalogger. The reference electrode has a 2 mm pin.
Should I connect the reference electrode on the ground pin connector? Is it possible to measure with this electrodes using the DrDaq datalogger?
Thank you in advance.

Gerry
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Joined: Mon Aug 11, 2014 11:14 am

Re: Ion selective electrodes DrDaq

Post by Gerry » Tue Mar 19, 2019 3:57 pm

Hi Pimentel

As you would be replacing our pH sensor, which has the reference and measurement electrode in the same enclosure, I would say that the way to connect up the two independent sensors would be to have reference electrode pin connected to ground at the pH sensor input of the DrDaq, and the measurement electrode pin connected to the signal at the DrDaq input. In theory it is possible to take a measurement this way, after having set up the response of the system (i.e. after having calibrated it) using known pH solutions, and having set up the measurement with an appropriate temperature measurement sensor (as long as the output voltage range from the difference between your 2 sensors is within the full-scale input range of the DrDaq input).

However, setting up the temperature sensor is key to getting accuracy out of your measurement, so depending upon the accuracy you need you may also find this post useful: topic27111.html.

Regards,

Gerry
Gerry
Technical Specialist

Pimentel
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Joined: Wed Mar 13, 2019 11:54 am

Re: Ion selective electrodes DrDaq

Post by Pimentel » Tue Mar 19, 2019 4:04 pm

Hi Gerry,
thank you so much for your reply. I will try to follow your comments, using also the temperature sensors. Let's see...

Regards,

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