RobbyG
Active member
I know everybody is going to say yes it's absolutely needed. Let me explain and you be the judge.
I have noticed that my ORP probe almost never needs calibration. If I soak it for 45 minutes in Kent probe cleaner and then calibrate it in 240mv fluid it will usually read 237 or 239, just about exactly right. My Salinity probe is just about the same, it is off by only a fraction after I clean it.
So based on that, I decided on my last cleaning routine (3 week intervals) to soak my Pinpoint pH probe in the kent cleaner for 40 Minutes, much longer than the 10 minutes that I normally do. This time when I calibrated it with the Pinpoint solution the 10.00 fluid read exactly 10.00 and the 7.00 read 6.98
After seeing that I realized that the probe might not need calibration if I cleaned it properly.
My conclusion on ORP and Salinity probes is that they don't change because they don't have anything that could change. The only thing that effects there reading is the coatings that develop on their surface and once that's removed they return to the exact reading they had when they where clean. The thing is, I am not so sure about the pH probe since it depends on a liquid inside the probe. Does anybody know if that liquid's composition changes over time or does it stay the same and just run out over time?
Any thought s or idea's on the subject would be welcomed
I have noticed that my ORP probe almost never needs calibration. If I soak it for 45 minutes in Kent probe cleaner and then calibrate it in 240mv fluid it will usually read 237 or 239, just about exactly right. My Salinity probe is just about the same, it is off by only a fraction after I clean it.
So based on that, I decided on my last cleaning routine (3 week intervals) to soak my Pinpoint pH probe in the kent cleaner for 40 Minutes, much longer than the 10 minutes that I normally do. This time when I calibrated it with the Pinpoint solution the 10.00 fluid read exactly 10.00 and the 7.00 read 6.98
After seeing that I realized that the probe might not need calibration if I cleaned it properly.
My conclusion on ORP and Salinity probes is that they don't change because they don't have anything that could change. The only thing that effects there reading is the coatings that develop on their surface and once that's removed they return to the exact reading they had when they where clean. The thing is, I am not so sure about the pH probe since it depends on a liquid inside the probe. Does anybody know if that liquid's composition changes over time or does it stay the same and just run out over time?
Any thought s or idea's on the subject would be welcomed
Last edited: