The MonoExact DF310E oxygen and moisture analyzer is designed for industrial gas applications

A range of standard variants and customized options are available to ensure the best-fit analytical solution for your process.

Designed specifically for accurate measurements of oxygen and moisture in industrial gas (IG) applications, the SERVOPRO MonoExact DF310E is a digital analyzer combining precision trace-level measurement with a new icon-driven guided user interface (GUI) and advanced digital communications.

  • High stability coulometric trace and percent measurements
  • A no compromise solution
  • Simple maintenance and reduced ongoing costs

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

We’ve got a solution to suit your process

The MonoExact DF310E is available in standard formats for common application requirements, and can also be customized to suit your unique process conditions.

Standard Variant 02

  • 0-100ppm High Resolution Sensor
  • Flow driven with flow switch
  • Configurable software options
  • Selectable mounting options
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A touchscreen oxygen and moisture analyzer for IG applications

A next-generation oxygen (O2) and moisture H2O analyzer designed for various industrial gas (IG) applications, the MonoExact DF310E combines trace-level measurement with new performance and operational benefits.

Built around the latest innovations in software and hardware – including a non-depleting Paramagnetic and updated Coulometric digital oxygen sensor – it offers enhanced user control and a reduced cost of ownership.

It also offers plug-and-play capability to operate the AquaXact Al2O3 probe for a dual measurement of oxygen and moisture. When connected to the moisture sensor, the screen is designed to simultaneously display both oxygen and moisture measurements.

Comprehensive analog and digital communication options ensure simple integration into a wide range of systems.


Matt Chambers
Business Unit Manager, Purity & Specialty

The definitive solution for IG gas production and bottling and blending

The MonoExact DF310E has been designed specifically to accurately measure oxygen and moisture in various industrial gas (IG) applications including nitrogen, argon and hydrogen production*‡, tanker transfil, specialty gas blending and electronic gases production. Combining Servomex’s latest advances in sensing technology and analyzer design into an advanced new platform, the DF310E is easy to operate and integrate into a wide range of systems.

* Paramagnetic cell is not for use with flammable samples
‡ Analyzer for use with flammable samples shall be configured with stainless steel inlet and outlet plumbing only

MonoExact DF310E

A no-compromise solution

Offering comprehensive analog and digital communication options for simple integration into a wide range of systems. Includes a Flat Line Alarm that monitors sensor measurements at LDL thresholds. MonoExact DF310E is backward-compatible with existing DF-310E installations, ensuring it complies with existing standards and customer agreements without the need for re-testing or re-qualification.

Simple maintenance and reduced ongoing costs

Built around the latest innovations in sensing technology combined with advance software and hardware – including a non-depleting paramagnetic and digital coulometric oxygen sensor – MonoExact DF310E builds on the original DF-310E with touchscreen operation, features to aid in commissioning and self-diagnostics monitoring benefits that improves user control and reduces cost of ownership. Updating firmware, downloading diagnostic files and copying the analyzer setup to transfer to another unit of identical configuration takes just a few clicks.

Man with Servomex System components

Our expertise builds better systems

If you’re looking for a gas analysis system, we can help. Our expert team uses a collaborative approach to design, build and install a solution that exactly matches your process specifications. Get in touch to find out more.

Pick the variant that meets your requirements

See what the pre-configured MonoExact DF310E has to offer with our product table.

(select to expand)

See the complete list of customizable options

Next-generation IG oxygen and moisture analysis

The MonoExact DF310E delivers a range of performance and operational benefits for IG operators

Paramagnetic sensor option

The MonoExact DF310E can be fitted with Servomex’s Paramagnetic sensor for percentage level measurements of O2.

Simultaneous dual-measurement

Designed to connect with an optional AquaXact 1688 sensor, the MonoExact DF310E can provide accurate O2 and H2O readings at the same time.

Touchscreen operation

An advanced color touchscreen with guided user interface (GUI) provides the MonoExact DF310E with intuitive set-up and operation.

Unrivalled performance

  • MonoExact DF310E O2 LDL
    0-100HR: 3 ppb
    0-100: 50 ppb
    0-1000: 250 ppb
    0-10,000: 2.5 ppm
    0-25% paramagnetic: ± 0.1%
  • Up to 5-year coulometric sensor warranty
  • Non-depleting coulometric and paramagnetic* sensors



  • Compatible with DF-310E platform, including hardware wiring inputs and gas inlets
  • Analog and digital outputs 4-20mA & 0-10 VDC, RS232, RS485 (Modbus) and advanced digital communication including Modbus Ethernet TCP/IP and PROFIBUS†
  • Optional integration of external AquaXact aluminum oxide (Al2O3) moisture sensor probe to allow for two measurements with one analyzer*
  • Battery and pump options available but, not in same analyzer*


Easy to use

  • Plug and play sensors
  • Large library of compatible gases‡
  • Intuitive icon driven touchscreen user-interface


Low cost of ownership

  • Field upgradable relay, alarm and communication protocols
  • Downloadable system file log and diagnostics means we can assess issues and upgrade remotely
  • Product can be upgraded in the field as your operational needs change
  • Minimal training requirements


Benchmark compliance

  • In compliance with Low Voltage, EMC, CE and CSA applicable directives
  • European and US Pharmacopeia compliant (coulometric and paramagnetic*)
  • Manufactured by Servomex – over 70 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

The MonoExact DF310E provides digital Coulometric sensing for O2 measurements, with the capability to fit a Paramagnetic sensor for % O2. It can also connect to the AquaXact 1688 Aluminum Oxide sensor for simultaneous O2 and H2O monitoring.

Gas Measurement
Oxygen (O₂)%, ppm, ppb
Water vapour (Moisture) (H₂O)ppm, dp


Coulometric Paramagnetic
MonoExact DF310E


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

Schematics (select to expand)


206mm (8.1”) Wide x 131 (5.2”) High x 245mm (9.7”) Deep


4.3kg (9.5lbs)

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.”

Matt Chambers
Business Unit Manager, Purity & Specialty

Get all the MonoExact DF310E information you need

“We’ve collected all the essential details about the MonoExact DF310E into a complete resource pack. To learn more about the features and benefits of this next-generation oxygen and moisture analyzer, download it now.”

Matt Chambers
Business Unit Manager, Purity & Specialty

Manuals and brochures

Want to know about the performance advantages and technical specifications of the MonoExact DF310E? Download our product brochure and operator manual now.

SERVOPRO MonoExact DF310E Product brochure

SERVOPRO MonoExact DF310E Product brochure

SERVOPRO MonoExact DF310E Recommended Spares

SERVOPRO MonoExact DF310E Recommended Spares

SERVOPRO MonoExact DF310E expert paper

SERVOPRO MonoExact DF310E expert paper

SERVOPRO DF150E & DF310E Operator Manual

SERVOPRO DF150E & DF310E Operator Manual

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


Take a look at the features and benefits of our trace digital oxygen analyzer

Unboxed: MonoExact DF310E

This SERVOPRO oxygen analyzer is unboxed by expert Chris Davis 

Typical applications

With a choice of Coulometric and Paramagnetic O2 sensing technologies, the MonoExact DF310E is designed to provide flexible gas analysis for a variety of industrial gas applications. It is suitable for the production of nitrogen, argon, and hydrogen, tanker transfilling, specialty gas blending, and electronic gas verification

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