Pyxis ST-500 and ST-500SS Inline PTSA Fluorometer

If your water treatment chemical supplier can provide inhibitor with PTSA fluorescent dye in the formulation, the ST-500 makes it easy for our W600 or W900 controller to measure and control the concentration!

The Pyxis ST-500 inline fluorometer measures traced chemical residual every 4 seconds with 1% accuracy. Turbidity and color in most cooling tower applications interfere with traditional fluorometer measurements, and lead to significant dosing errors. With the ST-500’s proprietary optical design and sophisticated compensation algorithm, even in water containing up to 150 NTU turbidity and 4 ppm iron, errors can be reduced or eliminated.

The Pyxis ST-500SS inline fluorometer supplies the same performance as the ST-500 in a rugged stainless steel body rated to 2 MPa (290 psi) at 65 C (150 F).



Key Features

  • High resistance to color and turbidity interference from sample water
  • Digital communication via Bluetooth to smartphone app for diagnosis and troubleshooting
  • Highly stable and extremely reliable even in harsh applications

Pyxis ST-525SS Inline Fluorescein Fluorometer

The Pyxis ST-525SS inline fluorometer probe measures the concentration of fluorescence tracer fluorescein in water up to 60 ppb. The stainless steel body of the ST-525SS probe makes it ideally suitable for applications of monitoring boiler feedwater or boiler blowdown after being cooled down to near ambient temperature

In addition to measuring fluorescence, the ST-525SS probe has extra photoelectric components that monitor the color and turbidity of the sample water. This extra feature allows automatic color and turbidity compensation to eliminate interferences common in real-world samples.


Pyxis SP-350 and SP-380 Handheld Fluorometers

The Pyxis SP-350 fluorometers measure the concentration of PTSA in a sample and the SP-380 measures both PTSA and Fluorescein. They have a built-in sample cell for ease of use.

Major features of these fluorometers include:

  • Extra color and turbidity parameters measured are used for automatic compensation to eliminate interference.
  • No sample cuvette is needed and variations associated with the cuvette is eliminated
  • Operates using AA batteries for >10,000 measurements per set
  • Single-point (100 ppb) calibration
  • 5 second warm up
  • Low maintenance field fluorometer


Pyxis SP-710 and SP-710B Handheld Multimeters

The Pyxis SP-710 series meters measure more than just fluorophores.

For the SP-710
• pH • Conductivity • PTSA • ORP • Temperature • Free and Total Chlorine

For the SP-710B
• pH • Conductivity • PTSA • Fluorescein • ORP • Temperature



Pyxis ST-500 Fluorometer Brochure

Pyxis SP-300 and 400 Handheld Fluorometer Brochure

Pyxis SP-710 and 710B Handheld Fluorometer Brochure

Pyxis ST-730 Turbidity Brochure

Pyxis MA-102S Submersible Adapter for ST sensors


  Download Pyxis Manuals