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4.2 System Shut-Down and Sensor Storage
The sensor membrane must be kept wetted at all times. The sensor is shipped with a protective cover
over the membrane cap. This should be kept on the sensor until it is put into service. If the sensor is
going to be removed from service for any length of time, it should be stored as follows:
1. Rinse the sensor with clean water.
2. Clean the sensor head as necessary per the cleaning procedure in Section 4.3 of this user
3. Fill the protective vinyl cap with clean water.
4. Secure the protective cap on the end of the sensor.
If the entire system will be taken out of service for any prolonged period, prepare it for storage as
follows:
1. Shut off process flow to the sample chamber.
2. Remove the Trace DO sensor from the sample chamber.
3. Clean and cap the Trace DO sensor as noted above.
4. Drain the sample chamber and rinse it with clean water. If necessary, clean any deposits as
5. Dry the interior of the sample chamber.
6. Place the capped Trace DO sensor back in the flow chamber for storage.
4.3 System Maintenance – Cleaning
In order to maintain an accurate measurement value, the sensor will need occasional maintenance. The
maintenance interval will be dictated by the process in which it is installed. The harsher the process, the
more often the sensor will require maintenance. Regular maintenance will yield a longer sensor life.
Clean the sensor as follows:
1. Remove the sensor from the sample chamber.
2. Rinse or spray the sensor with warm water to remove any heavy deposits.
3. If fine deposits are still present, soak the sensor in a container of warm detergent water for one
4. Rinse the sensor with clean warm water.
5. If deposits are still present on the membrane, repeat the soaking and rinsing steps.
Before returning the sensor to service, allow it to soak in water at ambient temperature for about an hour
to stabilize the DO membrane.
After cleaning the sensor, perform an air calibration per the instructions in Section 5.
Reinstall the sensor in the sample chamber and perform a 1-point calibration to adjust the sensor span
as necessary. See section 5 for instructions on performing a 1-point calibration.
Thermo Scientific AquaSensors
guide.
noted below.
hour. Do not use detergents that contain oily skin softeners like aloe or lanolin that can coat the
membrane. Alconox® and Dawn® dishwashing liquid work well.
™
AquaTrace
™
Trace DO System User Guide
14
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