LXT-220-DO9 PPB Dissolved Oxygen Analyzer

     The LXT-220-DO9 utilizes a unique amperometric sensor design combined with functionality of the proven LXT-220 to create a dissolved oxygen analyzer capable of sensitivity down to 1 ppb. 

     Unlike most two-electrode DO sensors, the LXT-220-DO9 consists of a three-electrode design. Diffusing oxygen molecules reducing at the cathode receive electrodes released from the oxidizing anode. This current flow measured across the two electrodes is proportional to dissolved oxygen concentration. The third electrode is used by the electronics to continuously optimize the polarization of the sensor, resulting in improved signal resolution and linearity across the scale including at ultra-low levels. 

     Signal conditioning, calibration and diagnostics functions are all integral to the sensor. This makes the LXT-220 controller truly universal so it can easily be interchanged with other controllers in the field. 

    The LXT-220 controller is weatherproof NEMA-4X ½ DIN form factor with universal mounting bracket available for panel, wall, handrail or pipe mounting. The membrane keypad and backlit LCD display provides an easy-to-use interface with menu-driven functionality. 4-20mA output is provided as standard and configurable alarm contacts can be provided optionally. Information is digitally communicated between sensor and control units which ensures EMI/RFI robustness and enables separation distances up to 200 meters. 


  • Boiler feedwater monitoring
  • Deaerator
  • Injection well