17. Operation and Maintenance of Neon pR
Dr. A. Kuntze
I
Gutes Wasser mit System
Robert-Bosch-Str. 7a
40668 Meerbusch
+49 (0) 2150-7066-0 / Fax -60
www.kuntze.com
69
17.2.1.
Cleaning of sensors
Handle and clean sensors very carefully. Always use water and perhaps a soft paper
tissue as the first cleaning agent. The pH-sensitive glass bulb of pH sensors is very
thin and must not be mechanically damaged.
We recommend diluted hydrochloric acid to remove coatings of lime or hydroxides,
and commercially available detergents to remove oil and grease. With organic
coatings, hydrochloric acid with pepsine or thiourea is usually efficient, especially to
open blocked junctions. Ceramic junctions can be cleaned mechanically, even
abraded. Make sure not to scratch the glass membrane in the process.
Clean the metal electrodes of ORP sensors regulary to remove coatings and grease.
Use commercially available detergents and rinse thoroughly with water. Mind that
after cleaning, the measurement takes a while to recover. You can speed up the
process by storing the sensor in KCl after cleaning.
17.2.2.
Refilling the KCl vessel (with refillable sensors)
When using refillable sensors, make sure that the level of the filling solution is always
higher than the water level, and that the internal pressure is always slightly higher
than the water pressure, to protect the sensor and to ensure its function.
Regular refilling of the vessel is especially important when the vessel is not visible,
for example if it is installed in an immersion-type assembly.
Note
If due to neglected refilling, process water could enter the sensor,
see the chapter
“Trouble-shooting”.
Summary of Contents for Neon pR
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