The Pyxis ST-587SS Series inline sensor measures PTSA concentration in water, using both LED UV and warm white light sources. PTSA is commonly used as a fluorescent tracer in cooling and process water treatment applications, particularly where turbidity measurement is a critical parameter. This 316L stainless steel version is built for high-pressure water systems (above 100psi / 6.9 Bar), operating up to 290psi.

The sensor connects to any device accepting isolated or non-isolated 4-20mA input, or RS-485 Modbus. Extra photo-electric components measure sample colour and turbidity, giving automatic compensation to eliminate interference as high as 150NTU, along with in-situ sensor cleanliness diagnostics. The short fluidic channel design is easier to clean than fluorometers with a flat distal sensor surface or a long, narrow fluidic cell.

A narrow-wavelength-band gallium phosphide photodiode paired with temperature- and humidity-resistant optical filters keeps the sensor stable across a wide range of ambient conditions. Diagnosis, cleaning, and calibration are handled via the MA-CR Bluetooth/USB adapter and the uPyxis mobile or desktop app.

The ST-587SS is well suited to data centre cooling applications, including condenser and technology cooling water quality monitoring, with low power demand (under 1.5W) and built-in transmitters for direct DCS/PLC integration.

Key specifications:

• PTSA range: 0–500ppb
• Turbidity range: 0–200NTU (compensated up to 150NTU interference)
• Outputs: 4-20mA (isolated/non-isolated) and RS-485 Modbus
• Material: 316L stainless steel
• Max operating pressure: 290psi
• Power: 24VDC, under 1.5W