SERVOPRO Servomex 4900 Multigas

Paramagnetic – an innovative solution for percentage oxygen

Servomex pioneered the use of Paramagnetic sensing technology, and it remains a proven, trusted cornerstone of our oxygen (O2) analysis products. Used by many of our industrial, portable and multi-gas analyzers, it delivers fast and reliable measurements of percentage O2 concentrations.

Our groundbreaking magnetodynamic Paramagnetic technology provides fast, accurate and sensitive measurements of percentage levels of O2.

The Paramagnetic cell consists of two nitrogen-filled glass spheres, mounted within a magnetic field, on a rotating suspension, with a centrally-placed mirror.

Light shines on the mirror and is reflected onto a pair of photocells. O2 is naturally Paramagnetic, so is attracted to the magnetic field, displacing the glass spheres and causing suspension rotation, which is detected by the photocells.

Current is applied through a feedback coil present in the magnetic field to provide sufficient torque to return the suspension to its original position. The magnitude of this current is directly proportional to the O2 present in the sample gas mixture.

Unlike electrochemical sensing technologies, a Paramagnetic cell never needs changing and its performance never deteriorates over time, reducing ongoing maintenance requirements and delivering a long operational life.

Related and alternative technologies

Paramagnetic sensing can be implemented alongside Infrared and Gfx sensing in key industrial processes such as ASU and CEMS applications. It can be affected by significant levels of movement and vibration, and also requires careful sample conditioning to protect the sensor and ensure an accurate measurement.

Key applications

Oxidation control reactions

EO, PTA and EDC manufacturing

Industrial and medical gas production

Medical/patient monitoring

Key benefits

Fast, accurate measurements specific to O2

Non-depleting, with a long operational life

Ideal for

Reliable, accurate O2 measurements in flammable or corrosive gas mixtures.

Explore the Paramagnetic 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


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

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Micro i.s. 5100


Designed for the measurement of oxygen (O2) in potentially flammable gas samples. Certified to Zone 0 and Zone 1 and suitable for measuring percent levels of O2.

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MiniHD 5200


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.

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MiniMP 5200


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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MonoExact DF310E


Designed specifically for accurate measurements of oxygen in industrial gas (IG) applications.

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MultiExact 4100


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

SERVOPRO MultiExact 4100
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MultiExact 4200


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

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Oxy 1900

SERVOTOUGH Hazardous Area

The Oxy 1900 oxygen (O2) gas analyzer sets new standards of flexibility, stability and reliability from a single, cost-effective unit.

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OxyExact 2200

SERVOTOUGH Hazardous Area

The high-specification OxyExact 2200 O2 analyzer offers an unrivaled combination of precision, flexibility and performance for optimum process and safety control.

OxyExact 2200 high-specification O2 analyzer
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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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