The SERVOTOUGH Oxy 1900 is a digital oxygen analyzer for hazardous area use.

Offering industry-standard features alongside revolutionary, value-added options, the Oxy 1900 oxygen (O2) gas analyzer sets new standards of flexibility, stability and reliability from a single, cost-effective unit.

  • Zone 1/Division 1 hazardous area rated
  • Digital Paramagnetic O2 measurements
  • Heated sample gas compartment for stability
  • Unique patented FlowCube flow sensor for enhanced safety
  • Auto-validation / calibration option reduces hands-on maintenance
  • Intelligent sample vent pressure compensation option

Setting new standards of flexibility, stability and reliability from a single, cost-effective unit, our base configuration model offers all the performance capabilities required for entry-level process oxygen measurements.

  • Solvent-resistant Paramagnetic sensor
  • 200ml/min sample inlet bulkhead option
  • 0/4-20mA analogue output
  • Six preconfigured signal interface relays
  • Modbus RTU (RS485) communications

For users facing typical process control requirements, our mid-level configuration meets the challenges involved, delivering the same reliable oxygen measurements as the base model, supported by additional automated capabilities and value-added features.

  • Has the same core options as Standard Variant 01
  • Heated sample inlet/outlook bulkhead
  • Auto-validation
  • Autocalibration

For users who want to get the maximum from their analyser and be ready to meet every eventuality, we offer a full-configuration model for the most demanding process O2 applications, with all available measurement options fitted.

  • Has same core options as Standard Variant 02
  • Internal sample pressure measurement
  • Solid-state Flowcube flow sensing technology

Get a gas analyser ready to meet the specific needs of your unique applications with a user-configured option.

If one of our standard variants doesn’t match your requirements, we offer custom configurations to match your process precisely.

Get in touch with our experts and tell us what you need to overcome your process challenges. We’ll create, configure, and calibrate your gas analyser to ensure it performs exactly as you expect, delivering key benefits and premium performance.


Standard Variant 01

Standard Variant 02

Standard Variant 03


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

Feature-rich oxygen analysis for hazardous or challenging applications

Keith Warren
Keith Warren
Product Manager – Process pm Oxygen & Zirconia Combustion

The Oxy 1900 sets the standard for O2 gas analysis, delivering a feature-rich solution designed to meet the monitoring needs of even the most challenging applications.

At the heart of the Oxy 1900 is Servomex’s patented Paramagnetic oxygen sensor, providing highly reliable, accurate and stable percentage measurements of oxygen. Uses industry-leading patented Paramagnetic technology for stable, non-depleting measurement – ensuring a long lifetime of ownership with low maintenance costs.

A safety-enhanced design for the most stable oxygen measurements

The Oxy 1900 combines enhanced-safety design aspects with ease of use and installation, creating an analytical solution that can reduce costs dramatically over product life. It offers clever, value-added features including a heated sample compartment for unrivalled measurement stability and simplified sample conditioning systems.

When you work with potentially dangerous, hazardous area applications, you need an O2 analytical solution that delivers benchmark safety compliance and complete reliability without question; product quality and plant safety depend on the equipment you integrate. The Oxy has IECEx/ATEX/UKEX: for Zone 1, and cCSAus C1, D1 for North America certification and is SIL2 (Route 1H) hardware compliant, ensuring it offers solid, trusted reliability in hazardous area locations.

Low maintenance, low cost-of-ownership

By utilizing patent Paramagnetic sensing technology, the Oxy 1900 benefits from a stable, accurate measurement that requires minimal calibration. Remote device interaction via digital communication options help to further reduce operational costs.

High performance monitoring with unique features

The Oxy 1900 introduces unique options that offer unrivaled flexibility, operational performance and reduced costs. An innovative heated sample bulkhead, when coupled with the fully heated sample compartment, can reduce the requirement for a gas conditioning system on samples with a dew point of up to 50oC/122oF and also offers excellent measurement stability; a unique FlowCube sensor which guarantees low flow indication during normal operation; and an integrated pressure compensation system compensates for sample pressure variation, enabling tighter process control.

Man with Servomex System components

Building a system? Contact the experts

If you’re looking to integrate the Oxy 1900 into your gas analysis system, we can help. Servomex can manage your project from design to installation, with our expertise built into every system. Get in touch to learn more.

  • Option selectable
  • Option not available in that variant
  • Pre-selected option

Leading-edge benefits

Designed for use in hazardous area locations, the Oxy 1900 offers advantages for safety, performance, and maintenance costs.

Excellent measurement stability

A heated sample gas compartment provides the Oxy 1900 with improved measurement performance, while an optional sample heater offers a simplified sample conditioning system design

Unique flow sensor

The Servomex FlowCube technology ensures the Oxy 1900 operates with enhanced safety.

Suitable for hazardous areas

The Oxy 1900 can be used in safe areas to Zone 1 / Division 1 hazardous rated locations.  It is SIL 2 (Route 1H) hardware complaint for safety system.

Unrivalled performance

  • Uses industry-leading patented Paramagnetic technology for stable, non-depleting measurement
  • Manufactured by Servomex – over 70 years’ experience innovating and pioneering gas analysis, and thousands of units used in the field every year


  • Can be used in locations up to Zone 1/Division 1 hazardous area rated
  • Intelligent diagnostics and flow sensing
  • Optimized for hazardous applications for example; safety critical oxidation, feedstock clean up, blanket inerting and flare stack analysis

Low cost of ownership

  • No need for reference gases/purge gases during operation including use with flammable samples
  • Long calibration intervals and cell life
  • Auto-validation reduces hands-on maintenance needs

Easy to use

  • Intuitive, engineer-friendly use and interaction
  • Reduced requirement for a gas conditioning system for samples with a dew point of <50°C/122°F when sample heated option is used
  • Unique FlowCube sensor technology provides unrivalled reliability and accuracy
  • Intelligent pressure compensation for barometric and sample vent back pressure mvariations

Benchmark compliance

  • IECEx/ATEX/UKEX: for Zone 1, and cCSAus C1, D1 For North America
  • SIL2 hardware compliance (Route 1H) functional safety manual available

CE marked to meet:

  • EU EMC Directive
  • EU RoHS Directive


Oxy 1900 oxygen (O2) gas analyzer


  • ATEX/UKEX/IECEx: Ex db ia IIC T4 Gb (-10°C ≤ Ta ≤ +60°C)* Ex tb IIIC T90°C Db (-10°C ≤Ta ≤ +60°C)*
  • Class 1, Division 1, Groups A,B,C,D T4 (-10°C ≤ Ta ≤ +60°C)*
  • Class II, Division 1, Groups E,F,G (-10°C ≤ Ta ≤ +60°C)*
  • CML  (Japanese) Ex db ia IIC T4 Gb (-10°C ≤ Ta ≤ +60°C)* Ex tb IIIC T90°C Db (-10°C ≤Ta ≤ +60°C)*
  • All variants comply with BS EN 61010

*(+14°F ≤ Ta ≤ +140°F) **(+14°F ≤ Ta ≤ +122°F). 

Schematics (select to expand)


448mm (17.6”) Width x 235mm (9.2”) High x 227mm (8.9”) Deep 


26kg (57lbs) nominal

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.”

Keith Warren
Keith Warren
Product Manager – Process pm Oxygen & Zirconia Combustion

Download your full Oxy 1900 resource pack now

“Get all the information you need about the features, benefits, and technical performance of the Oxy 1900 analyzer. We’ve packaged everything into one simple download.”

Keith Warren
Keith Warren
Product Manager – Process pm Oxygen & Zirconia Combustion

Manuals and brochures

Find out how to operate and install your Oxy 1900 with the downloadable manual. You can also see the features and benefits of the product in the brochure.

SERVOTOUGH Oxy 1900 Operator Manual

SERVOTOUGH Oxy 1900 Operator Manual

SERVOTOUGH Oxy 1900 Product brochure

SERVOTOUGH Oxy 1900 Product brochure

Typical applications

Designed for hazardous area use, the Oxy 1900 provides reliable Paramagnetic oxygen measurements for a wide range of industrial applications, including process control, feedstock purity, safety critical oxidation, vapor recovery, and flare stack analysis.

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