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The sample chamber should be kept clean as well. It should be inspected regularly for the formation of
deposits or films. Clean the inside of the sample chamber when required as follows:
1. Shut off process flow to the sample chamber.
2. Remove the sensor from the sample chamber.
3. Drain the sample chamber.
4. Rinse the chamber out with a soft brush and clean water. If necessary, use a mild detergent
such as Alconox or Dawn dishwashing liquid. Do not use chemical solvents or abrasive cleaners
on the sample chamber.
5. Rinse the chamber with clean water.
6. Insert the Trace DO sensor back into the flow chamber and secure it with the retaining ring.
7. Resume process flow through the sample chamber.
4.4 Sensor Maintenance – Replacing the Membrane Cap and Electrolyte
If the sensor head has been cleaned and the sensor will still
not calibrate properly, replace the membrane cap and
electrolyte solution per the following procedure:
1. Hold the sensor firmly with the electrode tip facing
down. Remove the existing membrane cap by turning
it counterclockwise. Dispose of the old membrane cap
and electrolyte using an approved method.
2. Fill the new membrane cap with fresh DO electrolyte
and gently agitate it to remove trapped bubbles.
3. Place the sensor head into the new membrane cap
4. Slowly screw the new membrane cap clockwise onto
the sensor head until secure. Place a finger tip on the
outside surface of the membrane and apply slight
pressure to support it as you thread the cap onto the
sensor. Excess electrolyte will be expelled from the
cap as you assemble it.
5. Before returning the sensor to service, allow it to soak
in water at ambient temperature for about an hour to
stabilize the DO membrane.
6. After soaking the sensor, perform an air calibration per
the instructions in Section 5.
7. Reinstall the sensor in the sample chamber and
perform a 1-point calibration to adjust the sensor span
Thermo Scientific AquaSensors
Install slowly! Screwing the membrane cap
on quickly may cause pressurization of the
membrane.
Do not over tighten!
Maximum torque: 10 lbs·in (1.130 N·m)
™
™
AquaTrace
Trace DO System User Guide
15
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