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MonoExact DF150E

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.

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.

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.

Unrivalled performance

  • MonoExact DF-150E O2 LDL
    0-100: 50 ppb
    0-1000: 250 ppb
    0-10,000: 2.5 ppm
  • 5-year coulometric sensor warranty
  • Non-depleting coulometric sensor
  • Stab-El ™ coulometric sensor now standard



  • Optimized for process control and product qualification applications
  • Compact footprint for simple integration
  • Compatible with DF-150E platform, including hardware wiring inputs and gas inlets
  • 4-20mA and 0-10V DC analog output options†
  • Battery and pump options available but, not in same analyzer†‡
  • External gas filter now mountable on the back of the analyzer (PN 222931)†


Easy to use

  • 5-inch high-brightness touchscreen and intuitive icon driven touchscreen userinterface
  • 6 user ranges available with each sensor offered
  • Servomex proprietary software makes reporting and parameter control simple


Low cost of ownership

  • No sensor zero calibration required
  • Minimal training requirements
  • Downloadable system file log and diagnostics means we can assess issues and upgrade remotely


Benchmark compliance

  • In compliance with Low Voltage, EMC, CE and CSA applicable directives
  • Manufactured by Servomex – over 60 years’ experience innovating, and pioneering gas analysis and thousands of units used in the field every year


‡ Not for use with flammable samples
* Analyzer for use with flammable samples shall be configured with stainless steel inlet and outlet plumbing only
† Configuration dependent

Gases sensed, measurements and technologies

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


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


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.”

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.”

Downloads available for this product

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.

MonoExact DF150EDF310E Operator-Manual

MonoExact DF150EDF310E Operator-Manual

MonoExact DF150EDF310E Operator-Manual

MonoExact DF150E Product Overview

MonoExact DF150E Product Overview

MonoExact DF150E Product Overview

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