what is the life of pH Electrode ?

Question

i am residant of india and working in private concern.we are using ph meter of Palmon global etc.some ph electrodes are working properily since last 10 years but some becomes showing wrong reading just after 2-3 months while all are used under same situations.so i would like to know do you help me.

Answer 1

typical pH electrode life is expected to be one year from the date of manufacture for most warranty purposes. They do depend on application and application variances (i.e. how stable the solution being tested is.. amount of variance, temperature , etc). these factors all shorten electrode expected life. As far as having 10 year working electrodes.. i have heard of this, but I wouldnt count on the quality of these elctrodes over a wide pH range. They should be tested and verified. They are most likely indicating near correct pH in a vary stable solution and not very responsive over a large range ( in other words they're currently zeroed into reading correctly and wont if the solution varies a lot). The failure rate after 2 months maybe the case with electrodes that have been on a shelf for long periods beore being commissioned for use or less likely but I have seen it - a bad "batch" of electrodes you received from stock. Consult your supplier for support. If these are being used in low temperature conditions (under say 45 degrees F) you may require thermal compensation to read correctly over the 32-45 degree range.