January 18, 2021, 09:21:02 PM
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### Topic: Connect external reference electrode to cheap meter with a combined input?  (Read 230 times)

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#### AbelianMemes

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##### Connect external reference electrode to cheap meter with a combined input?
« on: June 23, 2020, 11:44:54 AM »
I am trying to put together an inexpensive pH meter setup. The requirements are that I need an iodide specific, ion indicating electrode and a sliver-silver chloride reference electrode. Combined probes such as this exist, but are very expensive (> $250). Alternatively, I can buy just the Chinese made Shanghai Leici iodide electrode from Aliexpress for only$58, but I am uncertain how I would connect an external silver, silver-chloride reference electrode in this case.

The cheap pH meters only have a single BNC connector for a combined electrode. They don't have a separate port for the reference electrode. Can I simply solder the reference electrode wire directly to the outside of the BNC connector?  I am not sure how the electrical setup of these meters actually works.

Can anyone offer me some guidance on how I can convert 2 independent probes, the ion probe with a BNC connector, and the reference electrode with just a ground wire connector, to work with a cheap meter that only has a BNC connector and no separate reference wire input?