IM 50.560CA UA (B/4-03) 79
DEPOLOX
®
3 PLUS RESIDUAL ANALYZER
4.2 Free Chlorine (Bare Electrode) Sensor Kit
4.2.1 Maintenance
• Daily checks
Each day check the complete unit for leaks, including all pipe unions
and glands, and rectify all leaks immediately.
NOTE: All air leaks must receive immediate attention as they will
have a detrimental effect on the operation of the cell unit. Should an
air leak occur upstream of the measuring cell assembly, bubbles are
seen passing through the cell block. With a leak down stream of the cell
assembly, bubbles are seen only in the drain hose from the cell block.
Measure the actual free chlorine residual by any standard colorimetric
or titration method ensuring the equipment manufacturers instruc-
tions are strictly observed.
Draw the sample water from the sample drain nipple (see Dwg.
50.560.160.010 in Section 3).
NOTE: It is very important to obtain consistent results when measur-
ing the residual value of the test sample and it is recommended that
precisely the same method is used every time a sample is tested.
If the indicated residual on the controller or amplifier display varies
from the measured residual by more than is acceptable to the user,
carry out the calibration procedure referred to in paragraph 3.2.1, Free
Chlorine (Bare Electrode) Calibration.
If the variation still remains after recalibration, refer to “Bimonthly
check,” below.
• Weekly checks
With the sample water turned on, check that there is sufficient grit in the
measuring cell block to keep the electrodes clean. This will be indicated
by the amount of grit being swirled about in the vortex of the cell. Lack
of grit will lead to insufficient cleaning and more grit must be added.
NOTE: When fresh grit is added to the cell block a temporary rise in
cell output will normally occur which, generally, will last for two to
three hours. It is important that no calibration adjustments are made
during this period.
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