22
Table 2.2 (Continue)
Trouble, symptoms
Probable cause
Remedy
8 During measurements,
Е5
(excess measured sen-
sor current) is displayed on
the screen. Analyzer does
not respond to pressed but-
tons, except button
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
Broken analyzer
Factory repair
9 During measurements,
indication of exceeded dis-
play digit capacity appears
on the screen:
“Е6 mg/dm
3
”
readings less than minus
199,9 mg/dm
3
;
“Е7 mg/dm
3
”
− readings
exceeding 199,9 mg/dm
3
.
Operator’s errors in an-
alyzer calibrations
Para.2.6.6. Perform op-
erations to set initial ana-
lyzer parameters
Broken analyzer
Factory repair
10 During measurements,
Е8
is displayed on the
screen.
Faulty
temperature
measuring
channel
(heat probe breakage)
Factory repair
11
Е9
is displayed on the
screen.
Writing
error
in
ЕЕРRОМ memory
Factory repair
2.6.2 Membrane cleaning
The sensor membrane may be cleaned with a wad of alcohol-soaked cotton.
The sensor membrane may also be submerged in a weak solution (2 %) of
sulfuric acid for about 1 h, and then wash it in running water.
2.6.3 Filling the sensor with electrolyte, electrolyte replacement
As it is supplied in a dry state (without electrolyte), the sensor needs to be
filled with electrolyte after its receipt from the manufacturer.
Unscrew and remove the protective bushing from the sensor as per Fig.2.3.
