8
Sensor Maintenance and Precaution
The ST-773 sensor is designed to provide reliable and continuous dissolved oxygen readings even when in-
stalled in moderately contaminated industrial waters. Although the optics are compensated for the effects
of moderate fouling, heavy fouling will prevent the light from reaching the sensor, resulting in low readings
and the potential for product overfeed if the ST-773 sensor is used as part of an automated control system.
When used to control product dosing, it is suggested that the automation system be configured to provide
backup to limit potential product overfeed, for example by limiting pump size or duration, or by alarming if
the pumping rate exceeds a desired maximum limit.
The ST-773 sensor is designed to be easily removed, inspected, and cleaned if required. It is suggested
that the ST-773 sensor be checked for fouling and cleaned/calibrated on a monthly basis. Heavily contami-
nated waters may require more frequent cleanings. Cleaner water sources with less contamination may not
require cleaning for several months. The need to clean the ST-773 sensor can be determined by the
Clean-
liness and Selflife Check
using either the
uPyxis®
Mobile App (see the
section) or
the
uPyxis®
Desktop App (see the
section). If the
Cleanliness and Selflife Check
continues to return a
Please replace the DO membrane cap
, use an Allen wrench to remove the protective
cover, unscrew the current membrane cap, check whether the inside of the ST-773 sensor flashes blue and
red light, then screw on a new membrane cap and re-fasten the protective cover.
8.1
Methods to Cleaning the ST-773 Sensor
Any equipment in contact with industrial cooling systems is subject to many potential foulants and con-
taminants. Our inline sensor cleaning solutions below have been shown to remove most common foulants
and contaminants. The surface of the DCC-6 Dissolved Oxygen Membrane Cap can be cleaned with a cot-
ton swab. Please do not use sharp instruments to clean the membrane cap. In addition, the Pyxis Inline
Probe Cleaning Solution Kit may also be used to removal of heavy deposits, especially inorganics, and can
be purchased at our online E-Store
https://pyxis-lab.com/product/probe-cleaning-kit/
ST-773 User Manual
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