SERVOFLEX 5200 MiniHD

Infrared sensing provides real-time measurements of gases in a mixture

Infrared sensing is a flexible measurement technology based on the unique light-absorbing properties of some gases. It delivers a non-contact, real-time detection of the selected gas’s concentration in a mixture, and is widely used in our analyzer range, including portable analyzers, photometric products and multi-gas analyzers.

Our Infrared (IR) sensors focus an IR light source through a sample cell holding a continuously flowing sample of the gas mixture, and onto a detector after wavelength selection. The property of some gases to absorb unique light wavelengths can be used to detect the concentration of a selected gas in a mixture.

Depending on the intended application, this concept can be applied in two ways:

Single Beam, Single Wavelength (SBSW) delivers fast, stable and accurate real-time measurements with low maintenance requirements. It is used where a small transducer is required – the IR light source is electronically modulated, removing the need for a motor and rotating filters.

Single Beam, Dual Wavelength (SBDW) uses a pair of optical filters mounted on a rotating disc, which pass through a beam of IR light alternately. One filter (the measure filter) is chosen to pass light only at a wavelength that the gas to be measured absorbs, while the other filter (the reference filter) has a light passed through it at a wavelength unaffected by the gas to be measured. The difference in absorbance is measured by the detector and provides a direct output of the gas concentration.

Related and alternative technologies

Infrared technology is often paired with Paramagnetic sensing for dual measurements of oxygen and carbon dioxide, and works alongside Gfx sensing for many industrial applications.

Key applications

Ethylene, chlorine and TDI production

Continuous emissions monitoring

ASU process control

Key benefits

Real-time measurement response

Low maintenance requirements

Ideal for

Real-time, non-contact measurement applications, particularly where contamination might be an issue for other technologies.

Explore the Infrared analyzers we have for your process

Learn more about all our gas analyzer solutions that use this sensor technology.

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4900 Multigas

SERVOPRO Safe Area

The 4900 Multigas is a high-performance CEMS analyzer designed for a wide range of multi-gas measurements.

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MiniFoodpack 5200

SERVOFLEX Portables

A small sample volume portable benchtop analyzer focused on the checking and quality control of gas mixtures in Modified Atmosphere Packaging (MAP).

SERVOFLEX MiniFoodpack 5200
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MiniHD 5200

SERVOFLEX Portables

The MiniHD 5200 portable gas analyzer is a rugged, heavy duty analyzer designed to accurately measure the levels of O2, CO and CO2 within common gas mixtures.

SERVOFLEX MiniHD 5200
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MiniMP 5200

SERVOFLEX Portables

The only truly portable battery-powered gas analyzer with MCERTS and TUV certification, offers single or dual measurement of oxygen (O2) and carbon dioxide (CO2).

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MultiExact 4100

SERVOPRO Safe Area

A high-performance multi-gas analyzer designed to provide up to four simultaneous gas stream measurements.

SERVOPRO MultiExact 4100
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SERVOPRO MultiExact 4200

SERVOPRO Safe Area

The MultiExact 4200 analyzes up to four gases simultaneously for Syngas and HyCO

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SERVOTOUGH SpectraExact 2500

SERVOTOUGH Hazardous Area

Flexible single and multicomponent gas analysis capability for corrosive, toxic and flammable sample streams.

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Need more advice? Contact the gas analysis experts today

If you still need guidance to find the best solution for your process, we’re here to help. Our expert team combines applications knowledge with extensive experience and deep understanding of the sensing technologies available. We’ll help you find the solution that meets your unique needs.


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