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IMO - its a excellent solution - in my old work we use them with success. Because my siphon (around 2400 L/H) end 6 cm from a wall in my sump - I have placed them along the wall - direct in the flow - no need of a measure cellIf I was going to re plumb my setup I might look at using an measurement cell.
Yes - I have used many types of industrial pH-probes much more expensive than GHL:s pH probe - I always go back to the GHL probe. It is rather alike the old probe from Dupla - one that I found outstanding when I work in a Sewage plant 20 years ago. I have used GHL pH and redox probes in high loaded freshwater fish farms. Outstanding compared with others. The two I use now has been running in my aquaria for 6 years.@Lasse can probably attest to this, but the pH probes seam to last for many years.
That´s my experiences too - but I think it has with the temperature compensation to do . In your case - an incorrect reading of 6-7 degrees F can cause that deviation.When my probe is adjusted as far as I can set it, it reads 34.4 when the TM is at 35
My system nominal is 77FAbout the pH probe - at my old work we run several calcium reactors on them (and I think they still do) without any problems. Its - IMO - rock solid
That´s my experiences too - but I think it has with the temperature compensation to do . In your case - an incorrect reading of 6-7 degrees F can cause that deviation.
Sincerely Lasse
I suspect at workplace there will be procedures in place to maintain, clean etc… the probes.at my old work we run several calcium reactors on them (and I think they still do) without any problems.