21
Table 2.2 (Continue)
Trouble, symptoms
Probable cause
Remedy
3 When the zero point of
measuring
range
is
checked, analyzer readings
go beyond ±0,050 mg/dm
3
Ruptured or punctured
membrane,
sensor
seal failure
Para.2.6.3, 2.6.4. Replace
the membrane and elec-
trolyte
Moisture inside the
converter unit
Dry the converter unit for
3-4 days
Overstretched
mem-
brane
Para.2.6.4. Replace the
membrane assembly
Bad null solution
Replace the null solution
Broken
(cracked)
glass holder of sensor
electrodes
Factory repair
4 When the analyzer is cal-
ibrated by outside air,
Е3
(sensor current below rat-
ing) is displayed.
Electrolyte has leaked
out
Para.2.6.3. Fill in electro-
lyte
Contaminated
mem-
brane
Para.2.6.2.
Clean
the
membrane
Dry membrane
Keep the membrane in
water for 2-3 days without
dismantling the sensor
Defective membrane
Para.2.6.4. Replace the
membrane assembly
Analyzer sensor off
the outside air
Position the sensor in air
5 Electrolyte leaking out
fast
Ruptured membrane
Para.2.6.4. Replace the
membrane assembly
6.1 Sharp change in and
increased instability of ana-
lyzer readings.
6.2 During analyzer calibra-
tion by outside air,
Е4
(ex-
cess sensor current) is dis-
played on the screen.
Ruptured membrane
Para.2.6.4. Replace the
membrane assembly
Contaminated electro-
lyte
Para.2.6.3. Replace elec-
trolyte
Moisture inside the
converter unit
Dry the converter unit for
3-4 days
Ruptured teflon film
Para.2.6.4. Replace teflon
film
Analyzer sensor off
the outside air
Position the sensor in air
7 Extended time of re-
sponse to oxygen concen-
tration variations
Contaminated
mem-
brane
Para.2.6.2.
Clean
the
membrane
Contaminated
plati-
num electrode
Para.2.6.5. Clean the plat-
inum electrode
