Pyxis ST-565, Руководство пользователя, Страница: 16 / 18

7 Outputs
7.1 4–20mA Output Setup
The 4–20mA output of the ST-565 probe is scaled as:
• Halogenated Tolytriazole (HST):
– 4 mA = 0 ppm
– 20 mA = 7.5 ppm
The 4–20mA output of the ST-565T probe is scaled as:
• Tolytriazole (TTA):
– 4 mA = 0 ppm
– 20 mA = 10.0 ppm
7.2 Communication using Modbus RTU
The ST-565 Series probe is configured as a Modbus slave device. In addition to the ppm Fluorescent Polymer
and ppb PTSA values, many operational parameters, including warning and error messages, are available
via a Modbus RTU connection. Contact Pyxis Lab Customer Service (
service@pyxis-lab.com ) for more infor-
mation.
8 Sensor Maintenance and Precaution
The ST-565 Series probe is designed to provide reliable and continuous Fluorescent Polymer and PTSA read-
ings 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-565 Series probe 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-565 Series probe is designed to be easily removed, inspected, and cleaned if required. It is suggested
that the ST-565 Series probe be checked for fouling and cleaned/calibrated on a monthly basis. Heavily con-
taminated 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-565 Series probe can be determined by
the
Cleanliness Check using the uPyxis® Mobile App (see the Mobile Diagnosis Screen section).
8.1 Methods to Cleaning the ST-565 Series Probe
Any equipment in contact with industrial cooling systems is subject to many potential foulants and con-
taminants. Our inline probe 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 probe 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 Estore/Catalog
https://pyxis-lab.com/product/probe-cleaning-kit/
ST-565 Series User Manual service@pyxis-lab.com | +1 (866) 203-8397 13