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Maintenance and storage
ISE sensors
Do not let the ISE sensor reference electrode junctions dry out. Clean the sensors when deposits, bio-fouling or other
contamination appears on the membrane.
Figure 73 Ammonium and nitrate
maintenance
Ammonium and nitrate sensor maintenance
1. Carefully clean the ammonium or nitrate sensor by using a fine jet
of DI water or rinsing in alcohol followed by soaking in the high
standard calibration solution (Figure 73).
2. Carefully dab the sensor dry with a clean, lint-free cloth.
NOTICE: The ion-selective membranes are very fragile. Do not
use coarse material (e.g. paper towels) to clean the
membranes or permanent damage to the sensor can
occur. The only exception is fine emery cloth on the
chloride sensor.
Figure 74 Chloride maintenance
Chloride sensor maintenance
Carefully clean the chloride sensor by rinsing with alcohol and/or
carefully polishing with fine emery paper in a circular motion to remove
deposits or discoloration (Figure 74).
Carefully rinse with DI water to remove any debris.
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