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542 Programmable o2 gas analyzer

Programmable o2 gas analyzer 542

Programmable o2 gas analyzer for thermal conductivity analysis.


No longer available 

Unfortunately, this product – the Systech Illinois 542 02 Gas Analyzer – is no longer available for purchase. 

At Industrial Physics, we’re committed to continuously innovating our product range and providing you with the highest quality of test and inspection instruments available. And we have a wealth of gas analyzers on offer - you can view our full product range here 

If you’ve recently purchased this instrument, we will continue to support any servicing requirements you have. You can find out more about Industrial Physics services and the variety of options we provide here 

Your service options 

The Systech Illinois 542 02 Gas Analyzer will be supported for up to 10 years from last date of manufacture. Older (> 10 Years old) analyzers will be considered for calibration and service, however for significant repairs, this will be assessed on a case-by-case basis. If the repair is considered not cost effective or parts are deemed unavailable, Industrial Physics may decline this request.   

If you have any specific questions around this product, please get in touch by contacting 



This o2 gas analyzer instrument is especially suitable for measurements of mixtures containing hydrogen or helium. With the use of sensitive floating circuits, the thermal conductivity analyzer can detect gases down to parts per million levels and up to full concentration.

The analyzer is pre-programmed for a wide range of sample and reference gases, easily selectable from the simple front panel menu.

Calibration settings for each combination of gases used, are stored in an internal memory and are recalled automatically, every time a particular gas mix is required. This enables quick and easy switching between gas combinations.

Sophisticated microprocessor electronics enable the fastest possible response time, excellent stability and flexibility. Sample pressure and flow are internally controlled allowing connection to a wide range of pressurised samples. Automatic calibration is included as standard, the instrument can be set to perform at zero and span calibration at timed intervals.


  • Industry : Process
  • Gas : Oxygen, Carbon Dioxide, Binary mixtures
  • Application : Industrial Gas, Welding, Glove Boxes
  • Technology : Thermal conductivity
  • Measurement range : ppm and %. Dependent on selected gas mix. Adjustable, auto-ranging. Typical 0-1000ppm (H2 in N2) 98-100% (O2 in Ar)
  • Resolution : 0.5% or better
  • Accuracy : ±2% of scale of the stated typical value
  • Response Time : 90% of reading in 20 seconds
  • Suitable gases : Hydrogen, helium, oxygen, carbon dioxide, methane, carbon monoxide, argon, nitrogen and many others
  • Unsuitable gases : Corrosive gases
  • Ingress protection : IP40

Features and benefits

  • Programmable for different gases
  • Built-in linearization
  • Fast response
  • Excellent stability
  • Built-in alarms and analog outputs
  • Diagnostics
  • Insensitive to sample flow
  • Computer communications
  • Autoranging electronics
  • Built-in auto-calibration


  • Gas mixing
  • Welding gases
  • Heat treatment atmospheres
  • Hydrogen/helium purity
  • Food packaging gases

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