Thermo Fisher Scientific Eutech PC 700 User Manual

Page 25

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21

PROBLEM

CAUSE

SOLUTION

Calibration error.

Buffer value does not match

displayed value or electrode is

disconnected or failing.

Use fresh buffer solutions.

Check electrode connection.

Clean & recondition electrode.

Replace electrode.

Unstable pH

reading

Broken or worn electrode

Replace electrode

External ‘noises’ or induction

(electrical ‘noise’ caused by a

nearby motor)

Remove or switch off interfering device

Slow response

Dirty electrode.

Clean & rehydrate the electrode

CAL

during pH CAL

mode

Calibration was attempted

using only 1-point that was not

pH 7 (USA) or pH 6.86 (NIST).

Recalibrate using 2 or more pH points

or use pH 7 (USA)

or use pH 6.86 (NIST).

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