Record 186mV of the test data in step (1), clean the electrode and insert it into pH9.18 buffer solution, and read after stabilization, E2'=111mV (absolute value), ΔE'=E1' plus E2'=186 plus 111 =297mV, compared with the ΔE in the table, PTS=97 percent , qualified, generally new electrodes PTS Greater than or equal to 97 percent , long-term electrodes can be relaxed, but generally should be PTS Greater than or equal to 95 percent , unless the test accuracy requirements are very low.
(3) After cleaning the electrode, insert the pH4.00 buffer solution and compare the reading with the data in step (1). The error should be Less than or equal to ±2mV, otherwise it means that the electrode repeatability is poor.
⑷The test reading of the electrode should be stable within 30-60 seconds, otherwise the electrode response is too slow.
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