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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 77 Ammonium and nitrate
maintenance
Figure 78 Chloride maintenance
Ammonium and Nitrate Sensor Maintenance
1. Carefully clean the ammonium or nitrate sensor by rinsing with DI
water followed by soaking in the high standard calibration solution
(Figure
77).
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.
Chloride Sensor Maintenance
Carefully clean the chloride sensor by carefully polishing with fine emery
paper in a circular motion to remove deposits or discoloration
Carefully rinse with DI water to remove any debris.
Maintenance and Storage
(Figure
78).
69
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