Questions And Answers - TESTO 206 Instruction Manual

34

7. Questions and Answers

7. Questions and Answers
Question
Readings instable.
lights up.
Instrument switches itself
off.
Er1 lights up.
Er2 lights up.
Er3 lights up.
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Possible causes
Static charge.
Air cushion from measure-
mentelectrode gets into
measurement tip.
pH electrode has dried out.
Remaining capacity of bat-
tery < 10h.
Auto Off function is
switched on.
Invalid gradient value of pH
electrode.
pH electrode defective.
Invalid offset value of the pH
electrode.
pH electrode defective.
Invalid gradient value of pH
electrode following 3 point
calibration.
pH electrode defective.
Possible solution
f Rinse off pH electrode
with tap water or low con-
centration soap water.
f Shake pH electrode in a
downward direction like
with a fever thermometer.
f Place pH electrode for
several hours in water or
diluted hydrochloric acid.
f Change battery (See 6.6
Changing battery 33)
f Auto Off.
(See 5.2 Setting instru-
ment 26)
f Recalibrate instrument, a
new buffer solution could
be used.
f When using a probe
without temper-
aturesensor: check set
temperature value.
f Change probe.
f Recalibrate instrument, a
new buffer solution could
be used.
f Change probe.
f Recalibrate instrument, a
new buffer solution could
be used.
f Change probe.