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The DF-550E is designed to deliver ultra-trace measurements of O2 as a contaminant in ultra-high purity electronic gases. With the highly sensitive 200 ppt LDL delivering superior analytical headroom, the DF-550E’s fast response provides sensitive and dependable process monitoring.

Suitable for use with multiple background gases, the DF-550E is unaffected by sample and flow rate changes, making it ideal for upset prone conditions. Portability is optimized via a hand carry portable option and compact calibration system which can be integrated into the rear of the unit, optimizing device portability.

In addition to its performance and flexible use, the DF-550E minimizes ongoing monitoring costs. The non-depleting nature of our Coulometric sensing technology means the only ongoing maintenance requirement is an annual SPAN calibration, with no programmable cell replacement needed.

Ultra trace Oxygen analyzer optimized for quality measurements in high purity electronic gases

Gas: O2

Measures: ppb and ppt

Application: Quality Control

Sensing Technology: Coulometric


  • Quality control checks for electronics grade gases 
  • Leak detection for electronics grade gases


  • Ultra-trace Coulometric sensing is ideal for upset prone applications and compensates for sample and flow rate fluctuations
  • Monitors multiple background gases with a single unit
  • Low detection limit capabilities: 200ppt Lower Detection Level (LDL)
  • Flexible configuration options: initiation via front panel/digital interconnect

Easy to use

  • Various portability options
  • Simplified ongoing maintenance requirements
  • Optional calibration system for compact integration onto the rear of the panel

Low cost of ownership

  • Factory calibrated sensors for simplified set-up
  • Non-depleting Coulometric sensor with five year warranty
  • Requires only an annual SPAN calibration
  • Expensive and disruptive purifier replacements not required

Unrivalled performance

  • Uses industry-leading, high stability Coulometric ultra-trace sensing, with ultra-low drift potential
  • Highly sensitive 200ppt Low Detection Level (LDL)
  • Fast speed of response in the presence of changeable sample concentrations or flow rates
  • Quick upset recovery avoids “running blind” when process problems occur

Benchmark compliance

  • IEC 61010-1 
  • Overvoltage Category II, Pollution Degree 2 
  • EU EMC Directive 
  • EU Low Voltage Directive


  • 309mm (12.1”) Wide x 226 (8.8”) High x 253mm (9.9”) Deep


  • 8.2kg (18lbs)


  • IEC 61010-1 
  • Overvoltage Category II, Pollution Degree 2 
  • EU EMC Directive 
  • EU Low Voltage Directive


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