Pyxis PTSA & tagged polymer

Pyxis ST-588

An inline sensor designed to measure both PTSA and fluorescent polymer, for use in industrial cooling water and process treatment applications

The ST-588 inline sensor is a proprietary design for the direct measurement of both PTSA (365nm ex/ 410nm em) and “Fluorescent Polymer” (410nm ex / 450nm em). Through significant research and development, Pyxis Lab has developed the ST-588 combination inline sensor to independently measure both PTSA on a present scale of 0-200ppb (500 ppb capable) and fluorescent polymer on a scale of 0-20ppm. Customised scales are also available on request.


The ST-588 offers Pyxis proprietary algorithms to determine the concentrations of PTSA and active polymer residual simultaneously while measuring sample turbidity and colour in highly contaminated waters (ie. <150 NTU and 10 ppm Fe) for internal compensation. The ST-588 offers a combination of dual (2x) 4-20mA as well as RS-485 Modbus output signals, one for PTSA and one for Fluorescent Polymer.

The ST-588 is provided in CPVC with the standard Pyxis ST-001 inline 3⁄4” FNPT tee assembly, 5-foot bulk-head cable with quick adapter and 1.5ft flying lead cable with quick adapter, enabling rapid wiring to any microprocessor controller, PLC or DCS system. The ST-588SS is offered in 304L stainless steel with 3⁄4” FNPT ports for high pressure applications.

The ST-588 is bluetooth enabled for wireless cleanliness diagnostics and calibration when used with MA-CR bluetooth or PowerPACK series bluetooth adapters and the uPyxis app for mobile or desktop devices.

Product information


Product Range:

100 psi
ST-001 tee inc
290 psi
3/4" thread
ST-588: CPVC
Low cost CPCC contacting sensor
ST-588SS: Steel
Toroidal non-contacting PEEK sensor
ST-100: Tee
Low cost CPCC contacting sensor

Typical applications

Built for industrial cooling water and process treatment applications.

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Redefine simplicity and flexibility in cooling tower solutions with our plug-and-play service that delivers rapid installation.

We offer standard layout that serves as a solid foundation but we can be customise to meet the unique needs of any client site. We tailor the build to achieve optimal performance.

Our custom builds are popular as a comprehensive solution that's wired and seamlessly integrated meeting any site requirements. Email us today to learn more about our bespoke custom built solutions to speed up your installation and reduce operation or project downtime.


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Sensys Ltd

Head Office
24 Vision Park
Preston Place
Upper Caldecote
SG18 9GQ

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01438 759 595

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