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IM 50.560CA UA (B/4-03)
85
DEPOLOX
®
3
PLUS
RESIDUAL ANALYZER
4.3
Membrane Sensor Kit
4.3.1
Maintenance
Daily: Check the entire system including all screw fittings for leakage and
repair any leaks immediately. Using the cell outlet (see Dwg.
50.560.100.030 in Section 2), carry out a manual measurement every day.
NOTE: The same test method should always be used in order to
obtain consistent comparisons between results. Air bubbles at the
membrane effect the accuracy of measurement. The cause must be
determined and rectified.
When there is an obvious difference between the displayed value and the
manually measured value then a calibration must be performed (refer to
paragraph 3.2.2, Membrane Calibration). If the deviation remains, even
after calibration, then the electrodes should be cleaned in accordance with
the manufacturers instructions (see instruction sheet contained in the sen-
sor packaging).
Monthly: Perform a calibration.
4.3.2
Maintenance of the Membrane Probes
Before unscrewing the membrane cap, remove the elastomer seal to allow
air into the vent hole. Unscrew the membrane cap, clean the reference
electrode with distilled water and then dry with a clean paper towel. Cover
the vent hole with the elastomer seal. Refill the cap with new electrolyte
(refer to paragraph 2.3, Membrane Sensor). If the signal is still low or
unstable, it may be necessary to replace the cap with a new one.
After this procedure the probe requires a run-in time of about one to two
hours before recalibration.
4.3.3
Troubleshooting
The following troubleshooting table is provided for determining and cor-
recting most common troubles.
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