Pyxis dissolved oxygen sensors

Pyxis ST-772 series

The Pyxis ST-772 series are optical luminescent dissolved oxygen (DO) sensors for measuring the dissolved oxygen content in water

This series of sensors incorporates Pyxis’ advanced technology in the field of fluorescence detection and uses blue/red light detection with excitation and reference light sources, offering a wide detection range and very low detection limit. The sensor also integrates temperature and pressure sensors, which can perform temperature and pressure compensation for the measurement of dissolved oxygen based on ambient environmental conditions present in the application of use.


  • 0.004–20mg/L measurement range
  • No membrane replacement or electrolyte replacement
  • Simple DO cartridge replacement every 2 years
  • Built-in temperature & pressure sensor with automatic compensation
  • Accurate & stable measurement with ultra-low drift requiring no calibration for up to 2 years
  • Built-in transmitter without pre-amplifier or meter head
  • Dual outputs, both 4-20mA isolated signal & RS-485 modbus
  • Wireless calibration, diagnostics, data trend via uPyxis app when used with MA-CR
  • Slope calibration with air or air saturated water / zero calibrate with 5% sulphite solution or nitrogen gas
  • Submersible (ST-772 or ST-772P) or inline pipe tee (ST-772T or ST-772T-P) installation versions available


Typical applications

  • Activated sludge / aeration basin / nutrient removal
  • Wastewater / sewage processing
  • Chemical / process water applications
  • Domestic / drinking water applications
  • Filtration applications
  • Aquaculture
  • Agriculture
  • Compliant USEPA 40CFR part 136.3 as an approved method for measurement of dissolved oxygen in wastewater, drinking water and direct discharge

Product Range:

Pyxis ST-772 T-P
ST-772 T
Pyxis ST-590ss
ST-772 P
Pyxis ST-590ss

Product information

Related products

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  • Galvanic dissolved oxygen
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We offer standard layout that serves as a solid foundation but we can be customise to meet the unique needs of any client site. We tailor the build to achieve optimal performance.

Our custom builds are popular as a comprehensive solution that's wired and seamlessly integrated meeting any site requirements. Email us today to learn more about our bespoke custom built solutions to speed up your installation and reduce operation or project downtime.


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Sensys Ltd

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24 Vision Park
Preston Place
Upper Caldecote
SG18 9GQ

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01438 759 595

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