The Chroma is a highly versatile, ultra-accurate trace gas analyzer

One of the most flexible trace gas monitoring solutions available to the market, the Chroma is optimized to specific background gases to ensure optimum performance for your application.

  • High versatility for diverse application needs
  • A no-compromise solutuion
  • Easy and intuitive to use

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

A trace gas analyzer configurable to a wide range of applications

Chris Davis
Product Manager

Offering a non-depleting Plasma Emission Detector (PED), Flame Ionization Detector (FID) and Thermal Conductivity Detector (TCD), the Chroma analyzer is one of the most versatile gas analyzers for trace gas measurement available. Most applications will be satisfied by a single 4U rack analyzer configuration, making the Chroma a compact, cost-effective solution for continuous process control or quality monitoring.

High versatility for diverse application needs

Applications that depend on the very highest levels of product purity depend on trace analysis of exceptional sensitivity and performance. Impurities requiring measurement are both diverse in nature and found in a number of background gas streams, so high flexibility is also a must. Measurements need to be reliable, so a technology that can provide stability is essential. No matter what your application monitoring requirements, you’ll also want a solution that is easy to use and has a low lifetime cost-of-ownership. We don’t believe you should have to compromise.

A no-compromise solutuion

The Chroma’s flexible ultra-trace analysis is delivered through a smart combination of cutting-edge sensing technology and intelligent control software. Benefiting from the fast, accurate, sensitive and selective response of Servomex’s non-depleting Plasma Emission Detector (PED) cell, Flame Ionization Detector (FID) or Thermal Conductivity (TCD) technologies, the Chroma offers sophisticated configuration and performance options which are far ahead of the competition.

Servopro Chroma

Easy and intuitive to use

Added to the Chroma’s measurement performance is its ability to provide an easy-to-use solution with added flexibility. Feature-rich software permits full device interaction remotely via Ethernet/Internet, while a full range of reporting options provide simplified statistical data analysis. The Chroma also features a user-friendly high resolution TFT color LCD for easy local configuration and interaction.

Man with Servomex System components

Building a system? Speak to the experts

If you plan to integrate the Chroma into your existing system, or building a new one, we can help. Speak to our team before you get started to ensure the best advice and support for your project.

A powerful solution for process control and quality monitoring

The Chroma is a mainframe analyzer fully customizable to your application, with a number of performance and cost-saving benefits.

Software optimization

The Chroma is optimized via sophisticated and flexible operational software that offers access to all device functions via a PC. This updated software ensures increased security and stability, with a robust, Windows 10-based operating system.

Easy to use for complex applications

The Chroma has a fully automated, tune-to-the-application system for simplicity of use. PlasmaHC and ArgonSep technology supports the sophisticated sensor options, while a large, clear display screen makes operation easier.

Safer, cost-effective measurements

For CH4/NMHC measurements, the Plasma HC system requires no FID and therefore no H2 fuel gas, reducing costs and enhancing safety.

Unrivalled performance

  • Uses ultra-sensitive and highly selective patented PED sensing technology, delivering the highest reliability and performance currently available
  • PlasmaHC measures methane and NMHC without the use of a FID, eliminating the need for maintenance and fuel. ArgonSep separates Ar from O2 without the need for scrubbers, providing a sensitive, maintenance-free measurement



  • Comprehensive solution for ultra-trace H2, He, O2, N2, Ar, CH4, CO, CO2 and NMHC in a number of background gases; H2, O2, N2, Ar, He and CO2
  • Plasma, FID and TCD technologies used depending on application
  • Compact design that fits into a single 4U rack
  • Flexible communication options including Ethernet, RS232 and 4-20 mA output


Easy to use

  • Comprehensive device interaction and monitoring via intelligent software
  • Remote configuration via Ethernet/Internet
  • Electronic carrier and sample flow PID control system
  • Remote range I.D. contact per impurity


Low cost of ownership

  • Simplified reporting functions facilitated by the software
  • PED sensing technology does not require a separate methanizer


Benchmark compliance

  • Class B digital apparatus requirements of ICES-001 of Canada through the application of EN 61000-6-3:2007
  • Part 15 of the US FCC rules for Class B equipment
  • IEC 61010-1 for electrical safety
  • EC “Low Voltage Directive” by application of EN 61010-1 and rated for Over Voltage Category II, Pollution Degree 2

Gases sensed, measurements and technologies

Using highly accurate Gas Chromatography techniques, the Chroma is capable of trace measurements at part-per-million, parts-per-billion, or percentage levels in a range of background gases.

Gas Measurement
Oxygen (O₂)ppm, ppb
Argon (Ar)ppm, ppb
Carbon dioxide (CO₂)ppm, ppb
Carbon monoxide (CO)ppm, ppb
Helium (He)ppm, ppb
Non-methane hydrocarbons (NMHC)ppm, ppb
Hydrogen (H₂)ppm, ppb
Methane (CH₄)ppm, ppb
Nitrogen (N₂)ppm, ppb


Gas Chromoatography Plasma Thermal conductivity
Servopro Chroma


  • In compliance with EMC Directives, rated for Overvoltage Category II and Pollution Degree 2

Schematics (select to expand)


482mm (18.9”) Wide x 117mm

(4.6”) High x 600mm (23.6”) Deep


11-27kg (25-60lb) applications dependent

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.”

Chris Davis
Product Manager

Download our informative Chroma resource pack

“The resource pack for the Chroma has all the information you need, including the product manual and brochure. Download it now for technical specifications and other data that highlights how this analyzer can enhance your process performance.”

Chris Davis
Product Manager

Manuals and brochures

Download the manual and brochure for the Chroma to find out more about its features and benefits. You’ll learn how to install and operate this device, and discover all the technical data you need.

ES Magazine Issue 41 Reliable solutions for industrial gas applications

ES Magazine Issue 41 Reliable solutions for industrial gas applications

SERVOPRO Chroma – Quick Start Guide

SERVOPRO Chroma – Quick Start Guide

GC-PED vs APIMS expert paper

GC-PED vs APIMS expert paper

SERVOPRO Chroma expert paper

SERVOPRO Chroma 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

Ammonia Application video

See how our gas analysis solutions benefit process control, combustion efficiency, emissions monitoring, and quality in the ammonia production process.

Direct Reduction Iron application video

Discover our key measurement solutions for increased efficiency and reduced emissions in the DRI production process with this application video.

TDI Application Video

Our turnkey solution for the toluene diisocyanate (TDI) process supports process control, quality, and emission monitoring. Find out more in this application video.

Korean Service Centre

Go behind the scenes at our new state-of-the-art facility in Giheung-gu, Yongin-si, the first of its kind in Asia.

Typical applications

Medical gases

An advanced solution for purity assay and impurity detection

Learn more

Air separation units

Diverse sensing solutions that adapt to your process

Learn more

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