Starting at $1,996.00
  • Call for availability



  • Models available:
    • ST-500: 0 to 200 ppb, CPVC housing
    • ST-500RO: 0 to 40 ppb, CPVC housing
    • ST-500SS: 0 to 200 ppb, 304 SST housing
  • ±1% accuracy
  • Two-point calibration against standard solution
  • 5ft cable with IP67 connectors
  • Bluetooth communication
  • 3/4in NPT, panel mount installation
  • Operation pressure:
    • ST-500/ST-500RO: Up to 0.7 MPa (100psi)
    • ST-500SS: Up to 2.0 MPa (290psi)


The Pyxis ST-500 Series Inline Fluorometers are very popular models for real-time monitoring of inhibitor doses with their extreme accuracy and proven robustness in the application of fluorescence traced cooling programs. They are mostly used for feedback control to maintain the dosed concentration within a narrow band around the set point regardless of changes in cycle or heat load dynamics.

The ST-500 series expands the target of measurements to a broad range of analytes, including fluorescein and naphthenic disulfonic acid (NDSA) to bring your success of traced cooling programs to boiler and other applications.