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The MultiExact 4100 is a highly adaptable multi-gas analyzer

The MultiExact 4100 is a high-performance multi-gas analyzer designed to provide up to four simultaneous gas stream measurements including: oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), nitrous oxide (N2O), methane (CH4) and moisture (H2O).

Up to four simultaneous gas stream measurements

Specifically designed to address the needs of industrial and medical gas manufacturers, the MultiExact 4100 can provide up to four simultaneous gas stream measurements including: O2 (trace, control, and purity), CO2, CO (% and trace), N2O, and CH4 (trace).

It can be fitted with a wide range of sensing technologies – Paramagnetic, Zirconia, Gas Filter Correlation (Gfx), Infrared, and Aluminum Oxide. These proven, digital sensors not only provide highly accurate measurements but also offer operational flexibility in a range of industries and applications.

The non-depleting, high-stability sensing technologies help extend maintenance intervals while intelligent functionality such as independent auto-calibration helps to deliver operational efficiencies over a long product life.

Matt Chambers
Business Unit Manager, Purity & Specialty

High reliability and unrivalled performance

With a strong combination of features and benefits, the MultiExact 4100 is a highly adaptable analysis solution that meets a range of needs.
It uses a wide range of Servomex’s proven, reliable and accurate sensing technologies to provide up to four simultaneous gas stream measurements, meeting the challenges faced by industrial and medical gas manufacturers. With flexible analysis solutions capable of meeting specific process monitoring needs, the MultiExact 4100 delivers precise, stable results at every point of the ASU process. The versatile MultiExact 4100 can be customized to meet your exact requirements, giving you the accuracy you need, without compromise.

The next-generation solution

The MultiExact 4100 shows how sophisticated modern gas analyzers can be, with built-in support for the new Servomex AquaXact 1688 moisture sensor, up to 32 relays/alarms and four analog inputs for integrating information from external sensors such as temperature, pressure or concentration information from another gas sensor. In addition, analog and digital communications include the traditional 0-10V DC, 4-20mA, RS232 and RS485 outputs, while also providing optional advanced digital protocols, including Serial Modbus and PROFIBUS, with Ethernet (Modbus TCP/IP) to follow. In addition to its considerable monitoring capabilities, the MultiExact 4100 also provides engineer-friendly interaction through a high-brightness color touchscreen display and
an intuitive, icon-driven user interface. It combines all the reliability of Servomex’s familiar technology range with the flexibility, ease of use and range of intelligent digital options that the modern IG market demands.

Simple maintenance and reduced ongoing costs

The efficient, next-generation design of the MultiExact 4100 keeps maintenance requirements at a minimum. Servomex’s non-depleting, low-drift technologies are easy to set up and install, especially with the new touchscreen display and easy to use interface. With ongoing costs for sensor replacement eliminated, and recalibration only needed at extended intervals – plus independent auto calibration – the cost of ownership across the product lifetime is kept extremely low.

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The systems expertise you need

If you’re installing a gas analysis system, our expert team can design, scope and build it for you. Our collaborative approach ensures you get a system that matches your exact specifications, with commissioning and maintenance for optimum performance. Contact us to learn more.

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

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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

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

A highly adaptable gas analysis platform

The MultiExact 4100 is a versatile analyzer delivering operational flexibility for an extensive range of applications.

Configurable analysis

Simultaneously measuring up to four gas streams, the MultiExact 4100 can be fitted with a selection of sensing technologies for industrial and medical gas analysis.

Intelligent functionality

Next-generation capabilities such as independent auto-calibration help deliver operational efficiencies over a long product life.

Integrated support

The MultiExact 4100 is designed to operate easily with the AquaXact 1688 moisture transmitter, providing digital control for H2O analysis.

Unrivalled performance

  • Uses industry-leading, ultra-sensitive and reliable Paramagnetic, GFx Infrared, SBSW Infrared, Zirconia and Aluminum Oxide sensing technologies
  • Third generation platform building on more than 70 years of Servomex experience
  • Restless innovating will have new sensors available soon



  • Field upgradeable relay, alarm and communication protocols
  • Measures up to four gas streams simultaneously
  • Integrated support for the AquaXact 1688 Aluminum Oxide moisture transmitter
  • Digital communications for remote access: RS232/RS485 Modbus, PROFIBUS, and Ethernet (Modbus TCP/IP)
  • Up to 32 alarms and 32 relays with follow or freeze options
  • Four analog outputs and four analog inputs


Easy to use

  • Intuitive icon-driven user interface with color touchscreen
  • USB serial port for data logging and software upgrades
  • Analyzer configurations can be easily transferred to other analyzers via USB thumb drive
  • Download and email system files to leverage our remote service expertise


Low cost of ownership

  • Uses ultra-stable, nondepleting digital sensing technologies that help extend maintenance intervals
  • Auto-calibration function helps to reduce operational costs
  • Plug and play sensor replacement
  • Commonly integrated in to multiple stream switching systems


Benchmark compliance

  • USP and European Pharmacopoeia compliant method for assay of medical oxygen and medical air
  • In compliance with Low Voltage, EMC and applicable EU Directives – CSA Certification pending
SERVOPRO Servomex MultiExact 4100


  • EN 61010-1: Safety requirements for electrical equipment for measurement, control and laboratory use 
  • EN 61326-1: Electrical equipment for measurement, control and laboratory use 
  • EMC requirements 
  • Installation Category II rated in accordance with IEC664 

Schematic (select to expand)


132.5mm (5.2”) high (265.5mm (10.5”) high with expansion chassis), 481.6mm (19”) wide, 544.2mm (21.4”) deep 


Main unit: approx 14kg (30.9lb)

Expansion chassis: approx 13.7kg (30.2lb) (dependent on number and type of sensors used) 

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

All the MultiExact 4100 information you need

“We’ve collected all the essential details about the features and benefits of the MultiExact 4100 into one easy download. Get the resource pack now and discover the advantages and technical specifications of this innovative multi-gas analyzer.”

Matt Chambers
Business Unit Manager, Purity & Specialty

Manuals and brochures

Download the product brochure and operator manual for the MultiExact 4100 to learn more about the multi-gas monitoring capabilities of this innovative analyzer.

SERVOPRO MultiExact 4100 Installation and Operator Manual

SERVOPRO MultiExact 4100 Installation and Operator Manual

SERVOPRO MultiExact 4100 Product brochure

SERVOPRO MultiExact 4100 Product brochure

SERVOPRO MultiExact 4100 Recommended Spares

SERVOPRO MultiExact 4100 Recommended Spares

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

SERVOPRO MultiExact 4100

See how this multi-gas analyzer provides a solution for IG and medical gases

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