SERVOTOUGH SpectraExact 2500
SERVOTOUGH hazardous area

The rugged SpectraExact 2500 is ready for demanding process applications

Servomex’s iconic industry-leading photometric analyzer delivers flexible single and multicomponent gas analysis capability for corrosive, toxic and flammable sample streams. The SpectraExact 2500’s reliable, accurate and stable real-time online process analysis makes it ideal for a range of process, combustion and emissions gas analysis applications.

SERVOTOUGH SpectraExact 2500

Real-time photometric analysis of corrosive, toxic and flammable gas streams

Designed to provide a highly flexible analytical solution adaptable to many applications, the SpectraExact 2500 delivers a winning combination of proven performance and flexible operation in a resilient and reliable design.

It adapts to your process effortlessly to deliver a real-time online monitoring solution capable of single and multi-component analysis. Field mounting capabilities enables flexible use in the harshest process conditions.

Highly affordable, the SpectraExact 2500 uses an intelligent design and non-depleting sensing technologies to help to extend maintenance intervals and dramatically reduce ongoing costs.

Rhys Jenkins
Rhys Jenkins
Product Manager – Process Photometric Analyzers

Enhanced safety for the most dangerous locations

When you work on applications with complex process application requirements, you need a highly flexible, easy-to-use solution that is adaptable to your exact process specification monitoring needs.
The SpectraExact is fully certified for gas and dust zone 1 and 2 areas.

More features, more flexibility

With four model variants to choose from, each utilizing industry-leading IR or UV non-depleting sensing technologies, the SpectraExact offers an exceptional range of options to meet your specific application needs.

A full suite of digital communications platforms enable the full functionality of the SpectraExact to be controlled remotely and safely, with Modbus implemented through a choice of MODBUS RTU or MODBUS TCP/IP (Ethernet) protocols.

Options include a High Integrity cell, supplied with specialist chemraz “O” rings to ensure improved leak tightness for use in high concentration, highly toxic gas measurements. Meanwhile a heated cell is a standard option available on safe area, IEC Ex, and US class 1 division 2 variants.

Unbeatable value over product life

The ability to reduce ongoing costs and leverage maximum efficiency from safety equipment is essential to your business. This is why SpectraExact features an intelligent design that helps to reduce the frequency of maintenance requirements via sample cell and electronics segregation. This, combined with the use of non-depleting IR and UV photometric sensing technologies, ensures the SpectraExact delivers a long life of performance with a low lifetime cost-of-ownership.

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Building a system? We’re here to help

Do you need a gas analysis system? Get in touch with us before you start. We have the experience, expertise and engineering skills to see your project through to the end.

Ready to buy? Here’s how it works

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

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

Servomex Gas System Schematics


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

The benefits of photometric process monitoring

Flexible and resilient, the SpectraExact 2500 delivers proven results, even in harsh process conditions.

Enhanced for dangerous locations

Flexible and adaptable, the SpectraExact 2500 is fully certified for gas and dust zone 1 and 2 areas, with IECEx and North American hazardous area approvals.

Safe operation

The SpectraExact 2500 uses non-contact analysis techniques, with the sample cell segregated from the electronics for ease of maintenance and safety.

Flexible integration

The SpectraScan 2500 offers an exceptional range of options, including a full suite of digital communications that allows safe, remote control of its full functionality.

Unrivalled performance

  • Suitable for mounting in hazardous area locations
  • Highly reliable, accurate and stable



  • On line, real time analysis
  • Multi or single component gas analysis


Easy to use

  • Modbus RTU/Modbus TCP (Ethernet) options
  • Ideal for diverse gas sample types (0-180°C/32-356°F and 0-150psig/0-10barg/0-1,000kPag)


Low cost of ownership

  • Separate cell allows simple cleaning and servicing
  • Field proven non-depleting technologies


Benchmark compliance

  • IEC Ex and US hazardous area approvals
  • Certified for gases and dust
  • Certified to measure a continually flammable sample

Gases sensed, measurements and technologies

Highly flexible, the SpectraExact 2500 provides single and multi-component gas analysis in corrosive, toxic and flammable streams. Download the product brochure for a full list of available measurements.

Gas Measurement
Ammonia (NH₃)%
Carbon monoxide (CO)%, ppm
Carbon dioxide (CO₂)%, ppm
Hydrogen choride (HCL)%
Methane (CH₄)%
Hydrocarbon mixtures (C₁-C₅)%
Nitrous oxide (N₂O)%, ppm
Propane (C₃H₆)%
Total Hydrocarbons (THC)%
Water vapour (Moisture) (H₂O)%
Nitric oxide (NO)%, ppm


Gas filter correlation Infrared


  • IEC Ex Zone 2 (Gases), Zone 21 (Dusts)
  • By addition of a Certified Purge: IECEx Zone 1 (Gases)
  • North American Class I, Div 2 Groups A, B, C & D; Class II, Div 2 Groups F & G; Class III, Div 1 & 2
  • North American Class 1, Zone 2, Group IIC; Zone 21
  • UL approved 100-240V / 43-70Hz AC Power
  • IP66 / NEMA4X (IP50 with electrical heater)

Schematics (select to expand)


Max: 1,620mm (63.7”) Width x 500mm (19.6”) High x 284mm (11.1”) Deep


27kg (55lbs) to 50kg (110lbs)

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.”

Rhys Jenkins
Rhys Jenkins
Product Manager – Process Photometric Analyzers

The information you need, all in one download

“The flexible SpectraScan 2500 provides accurate measurements for so many gas components that we couldn’t list them all here. For all the features, benefits and technical specifications, including a comprehensive list of measurements, download our resource pack now.”

Rhys Jenkins
Rhys Jenkins
Product Manager – Process Photometric Analyzers

Manuals and brochures

Want more information about the SpectraExact 2500? Download our operator manual and product brochure, and get the details you need.

ES Magazine Issue 29 Clean Air

ES Magazine Issue 29 Clean Air

SERVOTOUGH SpectraExact 2500 – Approvals, Certificates & Conditions Manual

SERVOTOUGH SpectraExact 2500 – Approvals, Certificates & Conditions Manual

SERVOTOUGH SpectraExact 2500 Series QuickStart Manual

SERVOTOUGH SpectraExact 2500 Series QuickStart Manual

SERVOTOUGH SpectraExact 2500 Product brochure

SERVOTOUGH SpectraExact 2500 Product brochure

Typical applications

Reliable and accurate, the SpectraExact 2500 is ideal for gas analysis in combustion, emissions and process applications.

Water in ethylene dichloride/solvents | Ethylene production | Toluene di-isocyanate production | Chlorine production | Pure Terephthalic Acid (PTA) production

Ethylene production

We have the solutions to make your process more efficient

Learn more

Ethylene Dichloride

A flexible solution that supports product quality

Learn more

Direct reduction iron production

Effective solutions across the DRI process

Learn more

Carbon capture and storage

Extensive solutions for a range of carbon capture processes

Learn more

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