Sometimes the probe gets a coating on it and doesn't read correctly even after being calibrated. Needs to be sufficiently clean all around the measuring area. "The probe surface is where the instrument takes the reading of the solution or soil/media. If the probe face is dirty or contaminated, the readings may be inaccurate. Much like the windshield of a car, if it’s dirty you can’t see out! If the probe face is dirty, it cannot read the solution or soil accurately. pH probes specifically, should be kept wet at all times for optimal performance and life." Possible Solutions: Clean pH probe with distilled water and KIM wipe. Hydrate the pH probe in KCl storage solution Ensure calibration solutions are fresh and accurate (replace if in doubt) Wait longer for readings to stabilize before calibrating Check the pH probe for damage. If damaged, replace. In my experience, probes get damaged if they are tapped or wires are crimped in any way. I've also seen Buffer Solutions that have been used too many times. They get diluted or soiled from improper probe cleaning and need to be replaced frequently, depending on number of readings per day. Solutions have expiration dates on them as well.
Why there is a part, "porous plug" in the tube's end? If we immerse this tube into a water, are there possibly any water penetrate to the "Reference solution(KCl)" to mix the KCl? Will this make the the KCl solution contaminated?
very nice but sound is 'scratchy' and skips in some places. Thanks for putting this up.
Sigsite723 the porous plus let only ion to travel across then not the liquid
this video is very helpful.. i wasted a lot time trying to study this stuff on my own.. thanks a bunch
Thank you. Any idea on how one would get one working again once it seems to have stopped working?
Sometimes the probe gets a coating on it and doesn't read correctly even after being calibrated. Needs to be sufficiently clean all around the measuring area. "The probe surface is where the instrument takes the reading of the solution or soil/media. If the probe face is dirty or contaminated, the readings may be inaccurate. Much like the windshield of a car, if it’s dirty you can’t see out! If the probe face is dirty, it cannot read the solution or soil accurately. pH probes specifically, should be kept wet at all times for optimal performance and life."
Possible Solutions:
Clean pH probe with distilled water and KIM wipe.
Hydrate the pH probe in KCl storage solution
Ensure calibration solutions are fresh and accurate (replace if in doubt)
Wait longer for readings to stabilize before calibrating
Check the pH probe for damage. If damaged, replace.
In my experience, probes get damaged if they are tapped or wires are crimped in any way.
I've also seen Buffer Solutions that have been used too many times. They get diluted or soiled from improper probe cleaning and need to be replaced frequently, depending on number of readings per day. Solutions have expiration dates on them as well.
Why there is a part, "porous plug" in the tube's end? If we immerse this tube into a water, are there possibly any water penetrate to the "Reference solution(KCl)" to mix the KCl? Will this make the the KCl solution contaminated?
no, the bulb is only sensitive to hidrogen ion changes and will never change its original ionic composition only active ion composition
nice explanation, thank you
very good ..