7. Questions and Answers28
7. Questions and Answers
Question Possible causes Possible solution
Readings instable. Static charge. Rinse off pH electrode
with tap water or
low concentration
soap water.
Air cushion from measurement
Shake pH electrode in a
electrode gets into measurement downward direction like
tip. with a fever thermometer.
pH electrode has dried out.
Place pH electrode for
several hours in water or
diluted hydrochloric acid.
lights up. Remaining capacity of battery Change battery (See
< 10h. 6.4 Changing battery,
P. 11)
Instrument switches Auto Off function is switched on.
Auto Off.
itself off. (See 5.2 Setting
instrument, P. 8)
Er1 lights up. Invalid gradient value
Recalibrate instrument,
of pH electrode. a new buffer solution
could be used.
pH electrode defective.
Change probe.
Er2 lights up. Invalid offset value Recalibrate instrument,
of the pH electrode. a new buffer solution
could be used.
pH electrode defective.
Change probe.
Er3 lights up. Invalid gradient value Recalibrate instrument,
of pH electrode following a new buffer solution
3 point calibration. could be used.
pH electrode defective.
Change probe.
Er4 lights up. Probe not inserted correctly. Check connection.
pH electrode defective.
Change probe.
If we have not answered your question, please contact your
nearest distributor or Testo Customer Service point. For contact
data, see back of this document or web page www.testo.com/
service-contact
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