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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.
Problem is probes are in the salt water (harsh environment) all the time. Things will grow on them, corrode them, react with them etc… I suspect they can make better probes but the price of admission will be prohibitive.I guess what I don't understand is - Hanna and Milwaukee Instrument make a digital saltwater refractometer that is highly accurate.
Hanna even makes a saltwater testing "pen" which is highly accurate.
Yet no one can seem to make a monitoring probe that's accurate.
I´m not sure on thisI guess what I don't understand is - Hanna and Milwaukee Instrument make a digital saltwater refractometer that is highly accurate.
Hanna even makes a saltwater testing "pen" which is highly accurate.
Yet no one can seem to make a monitoring probe that's accurate.
Except none of the devices that you mentioned are accurate or repeatable. You can calibrate your conductivity electrode against a Tropic Marin Hydrometer and use the hydrometer as the reference standard.I guess what I don't understand is - Hanna and Milwaukee Instrument make a digital saltwater refractometer that is highly accurate.
Hanna even makes a saltwater testing "pen" which is highly accurate.
Yet no one can seem to make a monitoring probe that's accurate.