45
Table 2.1
Trouble
Probable cause
Remedy
1 With power ON display
shows no indications and
readings
Poor contact in the dry
cell compartment
Open
the
dry
cell
compartment and clean
contacts of dry cells or
batteries
Supply voltage is below
the allowable value
2.3.1. Replace dry cells
or charge batteries
2 With power ON display
shows
all
or
random
segments and signs
Discharged dry cells or
batteries
2.3.1. Replace dry cells
or charge batteries
3 On checking "zero" point
in the range of
measurements MAPK-
303Т analyzer readings go
beyond ±3 ppb
Torn
or
pierced
membrane,
affected
sensor tightness
2.6.6,
2.6.4.
Replace
membrane
and
electrolyte
Moisture ingress into
the convertor unit
Dry up the convertor unit
for 3-4 days
Stretched membrane
2.6.4.
Replace
membrane assembly
Low-quality
"zero"
solution
Replace "zero" solution
Broken (cracked) probe
electrode glass tube-
holder
To be repaired at factory
4 On analyzer calibration
against atmospheric air the
display
with
"CALIBRATION
IMPOSSIBLE.
LOW
PROBE
CURRENT"
message comes up
No electrolyte
2.6.3. Fill electrolyte
Dirty membrane
2.6.2. Clean membrane
Dry membrane
Make membrane wet for
2-3 days without probe
disassembly
Defective membrane
2.6.4.
Replace
membrane assembly
Analyzer probe is in a
medium
other
than
atmospheric air
Place the probe in air
5 Too slow response to
change
in
oxygen
concentration
Dirty membrane
2.6.2. Clean membrane
Dirty
platinum
electrode
2.6.5. Clean platinum
electrode
6 Electrolyte leaks rapidly
Torn membrane
2.6.4.
Replace
membrane assembly
7
Display
with
"ROM
ERROR,
DEFECT
METER" message comes
up. The analyzer responds
to
only
power
key
manipulation.
Unrepairable error
To be repaired at factory
