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MW180 pH / mV / EC / TDS / NaCl / Temperature Bench Meter
y
“WRONG OLD POINTS INCONSISTENT” is displayed if there is discrepancy between
new calibration value and old value recorded when calibrating with the same
probe in a buffer of the same value. Clear the previous calibration and calibrate with
fresh buffers. See Clear Calibration section for details.
y
“CLEAN ELEC” indicates poor electrode performance (the offset is out of the accepted
window, or the slope is under the accepted lower limit). Clean the probe to improve
response time. See pH Electrode Conditioning and Maintenance for details. Repeat
calibration after cleaning.
y
“CHECK PROBE CHECK BUFFER” is displayed when the electrode’s slope exceeds the
highest accepted slope limit.
Inspect the electrode and make sure the buffer solution is fresh. Clean the probe to
improve response time.
