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DOTX-45 - 56 -

Part 9 – System Maintenance

9.1 General

The DOTX-45 Dissolved Oxygen System will generally provide unattended

operation over long periods of time. With proper care, the system should

continue to provide measurements indefinitely. For reliable operation,

maintenance on the system must be done on a regular schedule. Keep in mind

that preventive maintenance on a regular schedule is much less troublesome

than emergency maintenance that always seems to come at the wrong time.

9.2 Analyzer Maintenance

No unusual maintenance of the analyzer is required if installed according to the

guidelines of this operating manual. If the enclosure door is frequently opened

and closed, it would be wise to periodically inspect the enclosure sealing gasket

for breaks or tears.

9.3 Sensor Maintenance

Sensor maintenance is required for accurate measurements. The primary

requirement is simply to keep the sensor membrane clean. The membrane is a

polymer material that is resistant to anything that will be encountered in water

streams. However, deposits or biological growth can form on the surface of the

membrane, and these deposits will reduce the sensitivity to oxygen. Normally,

these coatings can be removed by simply wiping the membrane with a soft cloth

or paper towel.

Should a coating form on the membrane that does not wipe off, it is best to

change the membrane. Chemical cleaning may work as well, but a new

membrane is a more reliable solution. To change a membrane, follow the

Sensor Assembly procedure in this manual. Do not reuse the electrolyte from

the sensor when changing a membrane. Always refill with fresh electrolyte. The

electrolyte is stable and does not have a limited shelf life.

Even if no buildup is apparent on the membrane, it should be changed on a

regular schedule. The recommended membrane change interval is every 6-12

months depending on application. The actual membrane life is often in excess of

one year, but periodic preventive maintenance will simply avoid having to do

service on an emergency basis.

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