14 APPENDIX 3: TABLE OF SELF-DI AG NOSIS SYMBOL
Self-Diagnosis Information
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
APERA INSTRUMENTS, LLC
Address: 6656 Busch Blvd, Columbus Ohio 43229
Tel: 1-614-285-3080
Email: info@aperainst.com
Website: www.aperainst.com
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