4165P Luminescent Dissolved Oxygen Analyzer

Ultra-Portable Oxygen Monitoring using Waltron’s Accurate and Dependable LDO Technology


The Waltron 4165P Ultra-Portable Luminescent Dissolved Oxygen Analyzer combines innovative optical technology with superior support for precise oxygen monitoring while on the go. Offering minimal maintenance and long-term stability, it ensures accurate readings at sub-ppb levels. Ideal for critical water analysis, the 4165P delivers reliable performance across various industries.


  • Extremely lightweight and portable, but solid and durable for hard industrial use
  • Easy to configure, capable of displaying dissolved oxygen as ppb, ppm, or %O2
  • Comes with one USB 4-20mA output (optional USB datalogger not included)
  • Simple, intuitive menu, with soft-touch buttons
  • Standard range: 0 to 200ppb (optional ranges 0-2000ppb and 0-20ppm)
  • Internal battery provides over ten hours of continuous use between charges
  • Built-in charger connects to standard 110-240VAC cable
  • Integrated battery charge state display
  • Easy to tap into sample lines with side in- and out- hose connections
  • Integrated carrying handle (optional carrying case)

  • Parameter: Portable Dissolved Oxygen
  • Technology: Luminescent (Optical)
  • Range(s): Standard 0-200ppb and 0-2000ppb
  • Accuracy: ±0.6ppb at 1ppb or 2% of measured value
  • Sample Streams: 1
  • Response Time: One sample every 30 seconds
  • Sample Frequency: Continuous
  • Analog Outputs: (1) 4-20mA current output
  • Calibration Method: Zero
  • Ambient Conditions: 0-55°C (32-131°F)
  • Sample Temperature: 0- 55°C (32°F – 131°F)
  • Sample Flow/Pressure: Max 145psig (10bar)

  • Power: 90-265vAC 15W max
  • IP Rating: IP66
  • Weight: 3kg (6.5 lbs)
  • Mounting: Portable
  • Materials: Durable plastic, rubber
  • Sample Connection: Flexible tubing
  • Maintenance Cycle: Annual zero; factory sensor spot replacement every 4 years

4165P General Arrangement Drawing (2)