5.
The Male Connector Body (A) may now be completely unthreaded from the
reducing coupling and the sensor removed for servicing.
6.3
pH Electrode Cleaning
If the electrode is coated or dirty, it may be cleaned as follows:
1.
Remove the sensor from process as instructed in Section 6.2.
2.
Wipe the glass bulb with a soft, clean, lint free cloth or tissue. If this does not remove the
dirt or coating, proceed to step 3. If the sensor appears to be clean, go to step 5.
3.
Wash the glass bulb in a strong detergent solution and thoroughly rinse with tap water. If
the bulb still appears to have a coating, proceed to step 4.
4.
Following the caution above, wash the glass bulb in dilute 5% hydrochloric acid solution
and then rinse it thoroughly in tap water. Replace the sensor if it cannot be cleaned. If the
glass bulb appears clean, proceed to step 5.
5.
Buffer calibrate the sensor (Refer to Section 5). If the sensor appears to respond
sluggishly to pH change, soaking it overnight in a weak acid solution (5% hydrochloric acid)
may improve its response. Be sure to follow the CAUTION above and to rinse the sensor’s
tip thoroughly with tap water. If the sensor will not calibrate, it must be replaced.
6.4
Cleaning Platinum Electrode
The electrode is never exposed to these undesirable compounds. In the event poisoning is
suspected, the electrode can be restored to normal operation by simply cleaning the platinum
electrode with baking soda. Polish it by rubbing it with a damp paper towel and baking soda until
a bright, shiny appearance is attained.
46
Maintenance
WARNING
Before removing the sensor from the ball valve, be absolutely certain that the ball valve is fully closed.
Leakage from the male connector threads may indicate that the male connector is still under pressure.
Leakage through a partially open valve could be hazardous, however with the ball valve closed, some
residual process fluid may leak from the connector's pipe threads.
If the male connector leaks during insertion or retraction, replace the O-ring (PN 9550099) in the male
connector A.
CAUTION
Maintenance
Instruction Manual
March 2017
LIQ-MAN-396R-396RVP
The solution used in the following step is an acid and should be handled with care. Follow the directions
of the acid manufacturer. Wear the proper protective equipment. Do not let the solution come in
contact with skin or clothing. If contact with the skin is made, immediately rinse with clean water.
CAUTION
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