Problem Possible cause Recommended actions
Measuring signal is
not stable
Membrane cracked
→ Change the membrane. See chap. 9.3.3.
Bubbles in the electrolyte
→ Empty the membrane cap and fill it again with new electrolyte without
bubbles. See chap. 9.3.2.
Gas bubbles on the membrane → Increase the flow rate temporarily.
→ If necessary check the installation and correct it.
The original colour (brown or grey) of
the reference electrode turns white or
shiny silver
→ Send the sensor back to Bürkert.
Output signal is
0 mA (only sensors
with 4...20 mA
output)
The sensor is not correctly wired to the
controller
→ Correctly connect the sensor to the remote controller type 8619.
The connection cables are defective → Change the cables.
The remote controller type 8619 is
defective
→ Do a check of the remote controller type 8619.
→ Do the slope calibration.
The sensor is defective → Send the sensor back to Bürkert.
Unstable values or
too low values are
measured
The electrolyte is too old
→ Change the electrolyte. See chap. 9.3.2.
If the electrolyte has just been changed,
the membrane holder (and the internal
holder if any) is defective
→ Change the membrane cap (and the internal holder if any). See
chap. 9.3.3.
The reference
electrode is shiny
silver or white
The reference electrode is damaged
due to chemical exchanges between
the measuring water and the electrolyte
→ Send the sensor back to Bürkert.
28
Maintenance and troubleshooting
Type 8232
english
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