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The MonoExact DF150E is an oxygen analyzer for general industrial use

With a new and improved digital touchscreen and icon-driven guided user interface (GUI) for easier operation, the MonoExact DF150E combines the reliability of Servomex’s tried and tested Coulometric oxygen sensor with a more user-friendly package.

Next-generation Coulometric analysis for a range of industrial applications

Using a new and improved digital touchscreen with icon-driven guider user interface (GUI) for easier operation, the MonoExact DF150E combines the reliability of Servomex’s tried and tested Coulometric oxygen sensor in a more user-friendly package.

Built around the latest innovations in software and hardware, including an updated Coulometric digital oxygen sensor, the MonoExact DF150E brings users new operational and maintenance benefits that improve user control and reduce cost of ownership.

Douglas Barth
Senior Global Product Manager

Compatible with existing DF-150E installations

A direct successor to the DF-150E, the MonoExact DF150E delivers the same precise, accurate oxygen measurement in a backwards-compatible design that integrates easily into existing systems. This ensures the MonoExact DF150E complies with existing standards and customer agreements, without the need for re-testing or re-qualification.

A new analyzer platform, optimized for IG customers

IG customers requiring accurate process control and product qualification rely on the precision measurements provided by Servomex’s DF and SERVOPRO analyzers. MonoExact DF150E forms part of Servomex’s next-generation industrial analyzer platform, which advances and standardizes a complete, integrated IG analysis capability through the latest innovations in software, hardware and sensor design. By delivering the same high-quality measurements and ensuring backwards compatibility with previous analyzers, customers get new control and maintenance benefits – while training requirements are minimized, re-testing and re-qualification problems are avoided, and products meets the high standards of global supply agreements.

An upgraded sensor for reduced maintenance

At the heart of the MonoExact DF150E is Servomex’s Hummingbird Coulometric sensor, which builds on the original DF Coulometric sensor’s accurate trace measurements. Significant design improvements have been made that reduce analyzer downtime.

Operation has never been easier

The MonoExact DF150E is built around Servomex’s new advanced user interface, which offers immediate hands-on control via a high brightness touchscreen display. Intuitive to use, Servomex’s software is optimized for a simple user journey, with the touchscreen GUI making reporting or adjusting control parameters effortless. Standard 0-10V output with optional 4-20mA available to export rich data to a control system, managing gas analysis has never been easier.

We’ve got your systems needs covered

If you’re building a gas analysis system, we can help. Our expert team delivers project management from start to finish and skilled engineering for the system that matches your exact process requirements.

Ready to buy? Here’s how it works

It’s easy to find the product you need for your application with Servomex


Get in touch to tell us what you need and the application you plan to use it for


Our expert team will help you select the right product package, ensuring you have the accessories and support to get the best performance from your analyzer


Your analyzer will be assembled in one of our state-of-the-art engineering centers and rapidly dispatched to your site

Precise and proven oxygen analysis

The MonoExact DF150E delivers all the benefits of our industry-trusted Coulometric sensing technology, in an easy-to-operate platform.

A proven solution

The MonoExact DF150E uses our tried and tested digital Coulometric O2 sensor for accurate, stable and reliable performance.

Easy to use

A five-inch color touchscreen interface makes operating the MonoExact DF150E easy and intuitive.

Versatile operation

Designed to meet the requirements of general industrial gas applications, the MonoExact DF150E measures across three ranges, for 0-100, 0-1,000 and 0-10,000 ppm O2.


  • Optimized for process control and product qualification applications
  • Compact footprint for simple integration
  • Back-compatible with DF-150E platform, including hardware wiring inputs and gas inlets
  • 4-20mA analog output and 0-10 VDC output options

Easy to use

  • Advanced 5-inch high-brightness touchscreen GUI for intuitive hands-on operation
  • Servomex proprietary software makes reporting and parameter control simple

Low cost of ownership

  • No sensor calibration required
  • Minimal training requirements
  • Five year warranty on Coulometric sensor

Unrivalled performance

  • Utilizes enhanced Hummingbird digital Coulometric sensing technology for precision process measurement
  • 100, 1000 and 10000 ppm ranges available
  • Manufactured by Servomex – over 60 years’ experience innovating and pioneering gas analysis and thousands of units used in the field every year

Benchmark compliance

  • Complies with Low Voltage, EMC and applicable directives

Gases sensed, measurements and technologies

The MonoExact DF150E utilizes Servomex’s tried and tested Coulometric sensor for reliable, accurate O2 measurements.

Gas Measurement
Oxygen (O₂)ppm, ppb




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

Schematics (select to expand)


210mm (8.5”) Wide x 200mm (8.0”) Height x 210mm (8.5”) Deep, with handle and feet


3.9kg (8lbs)

Get the detailed specifications

“For in-depth specifications you’ll want to download our technical datasheet which includes information on technology, performance, operating environment, sample conditions and compliance along with technical drawings and top-level benefits and applications.”

Douglas Barth
Senior Global Product Manager

Get the complete resource pack

“We’ve packaged together all the information you’ll need about the MonoExact DF150E, in one place. Download it now to learn about its features, benefits and specifications.”

Douglas Barth
Senior Global Product Manager

Manuals and brochures

Want to know more about the MonoExact DF150E? Download the operator manual and product brochure, and get more details about the analyzer and its role in general industrial applications.

SERVOPRO MonoExact DF150E/DF310E Manual

SERVOPRO MonoExact DF150E/DF310E Manual

SERVOPRO MonoExact DF150E Product Brochure

SERVOPRO MonoExact DF150E Product Brochure

MonoExact DF150E Spares

MonoExact DF150E Spares

SERVOPRO MonoExact DF150E expert paper

SERVOPRO MonoExact DF150E expert paper

See for yourself

Our videos give you the chance to watch our products in action and hear from our experts. You can also see our analyzers unboxed, and find out more about our solutions for key applications


Watch the product video for a closer look at this versatile oxygen analyzer

Typical applications

The MonoExact DF150E is easy to install and operate for oxygen gas analysis in a wide range of general industrial applications.

Glove boxes | Heat treating | Solder reflow ovens | Laboratory | Industrial gas production 

UHP Gases / Semiconductors

A comprehensive systems solution

Learn more

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