8
Sensor Maintenance and Precaution
The ST-590 sensor is designed to provide reliable and continuous Fluorescent Polymer readings even when
installed in moderately contaminated industrial cooling 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-590 sensor is used as part of an automated
control system. When used to control product dosing, it is suggested that the automation system be config-
ured 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-590 sensor is designed to be easily removed, inspected, and cleaned if required. It is suggested
that the ST-590 sensor be checked for fouling and cleaned/calibrated on a monthly basis. Heavily contam-
inated waters may require more frequent cleanings. Cleaner water sources with less contamination may
not require cleaning for several months.
8.1
Methods to Cleaning the ST-590Sensor
Any equipment in contact with industrial cooling systems is subject to many potential foulants and contam-
inants. Our inline sensor cleaning solutions below have been shown to remove most common foulants and
contaminants. A small, soft bristle brush, Q-Tips cotton swab, or soft cloth may be used to safely clean the
sensor housing and the quartz optical sensor channel. These components and more come with a Pyxis Lab
Inline Probe Cleaning Solution Kit
(P/N: SER-01) which can be purchased at our online E-Store
lab.com/product/probe-cleaning-kit/
Figure 18.
Inline Probe Cleaning Solution Kit
ST-590 User Manual
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