59
Maintenance and Storage
4.10
ISE Sensor
Figure 77 Ammonium and nitrate
maintenance
Figure 78 Chloride maintenance
ISE sensors are shipped with their tips in a storage bottle. Keep this bottle for long-term storage.
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.
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.
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
1. Carefully clean the chloride sensor by carefully polishing with
fine emery paper in a circular motion to remove deposits or
discoloration.
2. Carefully rinse with DI water to remove any debris.
Figure 79 ISE short-term storage
Short-term Storage:
When in regular field use, ISEs should remain on the bulkhead with the
calibration/storage cup installed. Place a small amount of tap or surface
water in the cup prior to storage or transport. The probes should be kept
in this water-saturated air chamber between uses; not submerged. Make
sure the storage cup makes a tight connection to prevent evaporation
(Figure 79).
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