I have a question reguarding the use of a desktop pH meter, The meter I am using comes with a BNC cap that shorts out the input to the pH meter, but I have to remove the cap to use a pH electrode to make measurements, what is the cap used for? and when would I use it?
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pH meter Use
- Thread starter Rakestraw
- Start date
The shorting cap is probably used to protect the input to the meter from damage, either through handling or ESD.
Considering that DI water is at 18 megohm-cm, one can imagine that the pH meter input is very high impedance and susceptible to static damage.
TTFN
Considering that DI water is at 18 megohm-cm, one can imagine that the pH meter input is very high impedance and susceptible to static damage.
TTFN
The cap simply keeps the terminal clean when you don't have a probe attached. It doesn't actually short anything out (the + and - aren't connected).
Have used all sorts of benchtop and portable pH meters in academic and industrial settings, and never heard of ESD being a problem. Not mentioned in Corning or Fischer manuals, either. High humidities, corrosive atmospheres and sloppy users were sometimes a problem.
Have used all sorts of benchtop and portable pH meters in academic and industrial settings, and never heard of ESD being a problem. Not mentioned in Corning or Fischer manuals, either. High humidities, corrosive atmospheres and sloppy users were sometimes a problem.
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