OTT Hydrolab DS5, User Manual

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Maintenance
6.6 Specific Conductance, Salinity, and TDS Maintenance
Clean the oval measurement cell on the specific conductance sensor with a small,
non-abrasive brush or cotton swab. Use soap to remove grease, oil, or biological growth.
Rinse with water.
6.7 ORP Sensor Maintenance
If the platinum band or stud of the ORP sensor gets dirty and/or discolored, polish it with a
clean cloth and a very mild abrasive, such as toothpaste; or use a fine polishing strip.
Rinse with water. Soak the sensor overnight in tap water to allow the platinum surface to
restabilize.
6.8 pH Electrode Maintenance
If the pH sensor is coated with oil, sediment, or biological growth, clean the glass with a
very clean, soft, wet non-scratching cloth or cotton ball with mild soap. Rinse with
tap water. If the pH sensor becomes dehydrated, soak for 24 hours in a pH 4 buffer
solution.
5.
Secure the membrane with
the O-ring. Make sure there
are no wrinkles in the
membrane or bubbles in the
electrolyte.
6.
Trim away the excess
membrane extending
below the O-ring.
7.
Proper membrane
assembly.
8.
Let the sensor soak a
minimum of 4 hours
(90% relaxed). Ideally,
the sensor should soak
for 24 hours.
Note: Readings may initially
drift if calibrated before the
membrane is fully relaxed.