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The DF-140E allows for reliable oxygen measurement in a wide variety of environments, including outdoors in a NEMA 4x enclosure and in explosive environments with a NEMA 7 remote sensor enclosure. 

Using highly stable Coulometric sensing technology, the DF-140E delivers reliable readings without frequent recalibration and periodic sensor replacement. It is specifically designed for reactor process control, pressure wing absorber nitrogen skids, and blanketing and inerting applications. With the STAB-EL system option it neutralizes trace contaminants, enabling accurate measurement in the presence of acid gases.

Thanks to its flexible and reliable measuring response, the DF-140E offers considerable cost savings over its product life, and can be configured as a single range or three-range analyzer to meet specific application requirements.

Reliable results in a testing range of hazardous environments

Gas: O2

Measures: %, ppm

Application: Process Control

Sensing Technology: Coulometric


  • Reactor process control

  • Pressure swing absorber nitrogen skids

  • Blanketing and inerting


  • Coulometric sensor ideal for upset prone applications

  • Durable – can be used in Class 1, Div 1 or 2 areas

  • Three-range or single-range configuration available

Easy to use

  • Factory calibrated for simple set-up

  • Simplified ongoing maintenance requirements 

  • NEMA 4x enclosure allows easy installation in non-protected environment

Low cost of ownership

  • Long-life Coulometric sensor with five-year warranty 

  • Only an annual SPAN calibration needed

Unrivalled performance

  • Uses industry-leading high stability Coulometric trace and percent O2sensing with ultra-low drift potential

  • Rapid response in the presence of changeable sample concentrations or flow rates

  • STAB-EL option allows for accurate measurement in the presence of acid gases

  • Manufactured by Servomex – more than 60 years of experience innovating and pioneering gas analysis and thousands of units used in the field every year

Benchmark compliance

  • IEC 61010-1

  • Installation Category II, Pollution Degree 2

  • EU EMC Directive

  • EU Low Voltage Directive


  • 19.7cm (7.75") Width x 21.6cm (8.5") Height x 25.4cm (10") Depth


  • 7kg (15lbs)


  • Low Voltage Directive (2002/73/23EEC)

  • EMC Directive (2001/89/336/EEC)


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