I have been using a seneye monitor for over six months. My tank water is 4.5 - 5.0dKH and GH is 8 degrees. The seneye consistently reads high on pH. I have checked it against an Extech PH100 pH meter (freshly calibrated using buffer solutions). When the seneye was reading 7.42, the Extech reads 7.10. That's quite an error. I do not understand the relevance of the graph on the seneye website talking about ionic strength. Starting with RO water, I make up the water in my tank to a conductivity of around 400uS/cm. Besides which, the seneye does not rely on ionic strength as it uses an optical system for measuring pH.
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Help me choose a pH meter
- Thread starter Sacha
- Start date
GlassWalker
Member
While the reading may be optical, it is reading the colour change on some chemical reactant on the slide. Presumably if the "ionic strength" gets too low, there is insufficient reaction to give a proper colour change and therefore reading.
Hi GW,
Yes, you have a valid point. Although there is a good deal of material on the Net about electronic colorimetric methods, I have not been able to ascertain the accuracy of these methods. But, I haven't given up looking.
JPC
