Dissolved Oxygen water quality monitoring is critical for aeration system process control. Optimization of the biological process, whether it’s removal of organic material, nitrification, or nitrification/denitrification, depends on maintaining proper DO levels. Controlling air flow to within the optimal range eliminates excess aeration, which translates into significant energy savings.

ATI’s Model Q46D Dissolved Oxygen Monitor is designed to provide reliable oxygen measurement and help reduce operating costs. Two types of sensing technologies are available for use with the Q46D system: Membraned Electrochemical and Optical (fluorescence). Both sensors will provide reliable long-term performance with minimal maintenance. No hardware modifications are required to change from one sensor type to the other. The monitor can be configured for AC or DC power supplies, and a portable battery-powered unit is available to meet a variety of monitoring needs.

When process conditions require frequent sensor cleaning, our unique Q-Blast Auto-Cleaner can be used to keep the system operating nearly maintenance free. This time-proven system has been instrumental in providing years of worry-free operation.

Key Facts

  • Sensor Options: Choice of using either optical or galvanic membraned sensors. Electronics handle either sensor option without adjustments or special programming.
  • Auto-Cleaning: Automatic “Air Blast” sensor cleaning system available for reducing maintenance in applications where sensor fouling is a problem.
  • Cal Check: Automatic calibration check at the end of an auto-clean cycle ensures sensor is clean and responding to changing oxygen concentration.
  • AC or DC Power Options: Power options include universal 90-260 VAC or 12-24 VDC.
  • Analog Output Options: Two isolated 4-20 mA outputs are standard, with an option for a third output if required. Default setting provides analog outputs for D.O. and temperature.
  • PID Output: Standard PID control function assignable to one analog output.
  • Digital Communications: Three digital communication protocols are available: Profibus DP Modbus RTU or Ethernet IP.
  • Relay Outputs: Three SPDT relays are standard, with relay functions programmable for alarm, control, or trouble indication. An additional three internal low-power relays provide control of the automatic sensor cleaning function.
  • Flexible Mounting: NEMA 4X (IP-66) enclosure is suitable for wall, pipe, or panel mounting.
  • Clear Display: Back-lit large LCD display provides clear visibility in any lighting conditions. A scrolling second line on the display provides additional information and
    programming prompts.

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