Apera Instruments PH800

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14 APPENDIX 3: TABLE OF SELF-DI AG NOSIS SYMBOL
Symbol
Self-Diagnosis Information
pH
Conductivity
Wrong calibration solution or the meter recognition of
calibration solution out of range.
√
√
Press key when measuring value is not stable
during calibration.
√
√
During calibration, the measuring value is not stable
for ≥ 3 min.
√
√
pH electrode zero electric potential out of range (<-
60mV or >60mV)
√
pH electrode slope out of range (<85% or >110%)
√
Enter in pre-set due calibration to remind re-calibration
√
√
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