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The ST600 probe measures the optical density of bleach solutions using UV light.




(Bleach sensor)

The Pyxis ST-600 inline probe measures the concentration of bleach (sodium hypochlorite) and its optical density using a near UV light. The probe has a built-in reference light source and a reference light detector in addition to the main light source and the main light detector. The wet part of the probe is a 6 inch long, 7 mm OD Teflon tube. This configuration ensures longterm stable measurement of the bleach concentration. The ST-600 probe can be connected to any device that accepts an isolated or non-isolated 4-20mA input.
Manufactured by: Pyxis Lab Inc., USA

  • Bio-control for industrial water
  • Industrial oxidiser generation (i.e. hypochlorite/monochloramine)
  • Swimming pools and spas
  • Hospitals
  •   Key Features 
  • Measures disinfection liquids in high concentration, without dilution or reagent addition
  • Can conveniently be connected to the suction or discharge side of the bleach pump tubing using a union or a quick push-in connector
  • Can be calibrated with a PC or smartphone app via a Bluetooth/WiFi adapter
  • Eliminates color and turbidity interference
  • ST600 measures the percentage of concentration of bleach (0-16%)
  • ST601 measures the percentage of ClO2 (0-0.35%)
  • Realtime measurement
  • Oxidiser control systems
  • 4-20mA and Modbus RS485 connection
  •   Specifications 
  • Method: UV absorbance
  • Power supply: 22-26V DC, power consumption: ~1W
  • Outputs: Isolated 4-20mA analog output, isolated RS-485 digital output, supporting MODBUS protocol
  • Dimensions: 6.8 inch length, 1.44 inch body diameter
  • Weight: 0.37 pounds
  • Installation: 7 mm OD Teflon tubing for measurement flow, customised ¾” tee in PVC also available when ordering
  • Material: CPVC
  • Pressure: Up to 100psi
  • Temperature: Operation 40°F to 120°F, storage 20°F ~140 °F
  • Cable length: 5 feet, terminated with IP67 connectors, 30 feet, 60 feet extension cables available
  • Calibration: Two-point calibration against standard solutions
  • Rating: IP66
  • Regulation: CE marked
  • Long maintenance and calibration cycle: 6 months typically
  • Digital displays via Modbus RTU

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