Pyxis tagged polymer sensor

Pyxis ST-590

A fluorescent polymer inline sensor, designed for the direct measurement of fluorescent polymer with a 410nm excitation and 450nm emission

The ST-590 inline sensor measures fluorescent “tagged” polymer (410nm ex/ 450nm em) independently. The ST-590 measures for fluorescent polymer at a range of 0–20 ppm. Like our ST-500, the ST-590 offers internal algorithms that compensate for colour & turbidity interference. Connect the ST-590 to your controller using dual 4–20mA or RS-485 Modbus output signals.

PTSA & fluorescent polymer combination monitoring

Through significant research and development, Pyxis has developed the ST-590 inline sensor to be used independently or in conjunction with the world-renowned Pyxis ST-500 inline PTSA sensor. With this unique design the PTSA commonly used in cooling water treatment as a fluorescent tracer will not interfere the ST-590 measurement of the fluorescent polymer.

Product information


Product Range

0.0–20.0 ppm
100 psi
±0.1 ppm
ST-001 tee inc
0.0-20.0 ppm
290 psi
±0.1 ppm
3/4inch FNPT
Low cost CPCC contacting sensor
Toroidal non-contacting PEEK sensor
ST-100: Tee
Low cost CPCC contacting sensor

Typical applications

Built for industrial cooling water and process treatment applications.

Related products

  • Pyxis ST-500 Inline Sensor

    Real-time monitoring of inhibitor dose, accurate & robust

  • Pyxis ST-500 Inline Sensor

    PTSA & tagged polymer
    Dual inline sensor for industrial cooling water applications

  • Pyxis ST-590 Inline Sensor

    PTSA & turbidity
    Utilising both LED UV and warm white light sources

  • Pyxis HM-500

    Oil in water
    Measures for oil in water at a range of 0-10ppm

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Custom build solutions

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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Our focus revolves around installation best practices, ensuring seamless product connectivity, and optimising maintenance procedures. Take the first step towards maximising your team's potential. Email us today to learn more about our bespoke training offerings, check availability, and embark on a journey to enhance your team's expertise.

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Sensys Ltd

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24 Vision Park
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