Pyxis ST-500W Inline PTSA Sensor for Industry Standard Tee Assemblies
Stainless steel inline PTSA sensor built to drop directly into WALCHEM and other industry-standard tee assemblies. Measures PTSA 0–300ppb with colour and turbidity compensation, no plumbing modification needed.
Pyxis ST-500W Inline PTSA Sensor for Industry Standard Tee Assemblies
The Pyxis ST-500W is a stainless steel inline PTSA sensor built to drop directly into WALCHEM and other industry-standard fluorometer tee assemblies without plumbing modifications. It uses LED UV light sources for direct PTSA measurement and applies Pyxis's proprietary compensation algorithms to hold accuracy even where sample turbidity or colour would otherwise distort the reading. Output is via 4-20mA analog and RS-485 Modbus, with Bluetooth-enabled calibration and diagnostics through the uPyxis app.
Description
The Pyxis ST-500W is a stainless steel inline PTSA sensor designed to drop directly into WALCHEM® and other industry-standard fluorometer tee assemblies, without needing plumbing modifications. It is internally identical to the standard ST-500 Series in design and function, using LED UV light sources for direct PTSA measurement, with output over a 0-200ppb scale (extendable to 0-300ppb via the uPyxis app) at ±1ppb accuracy.
The ST-500W applies Pyxis’s proprietary compensation algorithms to hold PTSA accuracy even where sample turbidity or colour would otherwise distort a standard fluorometer reading, making it suited to industrial cooling water and process water treatment applications with variable water quality.
Output is via 4-20mA analog and RS-485 Modbus in 8-pin cable format, with Bluetooth enabled for wireless cleanliness diagnostics and calibration via the MA-CR adapter and uPyxis app. The unit ships with a 1.5m bulkhead cable and a 1.5m flying lead cable for rapid wiring to a PLC, DCS, or third-party controller.
Why Use This
No plumbing modification needed
Drops directly into WALCHEM and other industry-standard tee assemblies, simplifying retrofits and replacements.
Accurate readings in variable water quality
Proprietary compensation algorithms correct for sample turbidity and colour that would otherwise distort a standard fluorometer.
Wireless calibration and diagnostics
Bluetooth connectivity via the MA-CR adapter and uPyxis app allows cleanliness checks and calibration without opening the line.
Applications
- WALCHEM-style tee retrofits — drop-in PTSA sensor replacement with no plumbing changes
- Industrial cooling water treatment — PTSA tracer monitoring with turbidity/colour compensation
- Process water treatment with variable water quality — accurate PTSA readings despite turbidity or colour interference
FAQ
Can this sensor replace my existing WALCHEM fluorometer without re-plumbing?
Yes. The ST-500W is designed to drop directly into WALCHEM and other industry-standard fluorometer tee assemblies without plumbing modifications, installing via a provided ST-001 inline tee and 3/4″ FNPT fitting.
What is the PTSA measurement range and accuracy?
The output scale is 0-200ppb, extendable up to 0-300ppb via the uPyxis app, at ±1ppb accuracy.
How does it handle turbid or coloured water samples?
It applies Pyxis’s proprietary compensation algorithms to hold PTSA accuracy even where sample turbidity or colour would otherwise distort a standard fluorometer reading.
What are the operating temperature and power requirements?
Operating temperature is 4-49°C, and power requirement is 22-26VDC at 1W.
How is calibration and diagnostics handled?
Bluetooth is enabled for wireless cleanliness diagnostics and calibration via the MA-CR adapter and the uPyxis app.
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