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'+E2'=186+111 =297mV, compared with the ΔE in the table, PTS=97%, qualified, generally new electrodes PTS ≥ 97%, long-term electrodes can be relaxed, but generally should be PTS ≥ 95%, 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 ≤±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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