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Home » Michell Instruments » Oxygen & Binary Gas Analyzers

Oxygen & Binary Gas Analyzers

Measurement and Analysis

A range of quality process analyzers from experts in control instrumentation

Precise measurement of oxygen and other gases is critical for processes in many industries, ranging from the purity of industrial gases and protecting against leaks in glove boxes to monitoring flue gas for optimum combustion efficiency. The requirements of various applications are very different, therefore Michell offers a range of analyzers to ensure that you can always select the best technology for your application.

Why Choose Michell?

With an oxygen analyzer from Michell Instruments you get:

  • The right measurement technology for your application - thermo-paramagnetic, MSRS, MIPS & thermal conductivity
  • Control over your process for safety, quality and to meet legislation
  • Low cost of ownership – the analyzers are designed for minimum maintenance
  • Support from a worldwide network of service engineers and customer service teams from Michell offices in 9 countries and distributors in over 50 countries
  • Confidence in a company that has been providing solutions in process control and measurement for over 40 years

Sensor Technologies

A range of sensor technologies unique to each instrument, maximizing measurement ranges and applications.

Thermo-Paramagnetic
Michell’s thermo-paramagnetic sensor uses a combination of paramagnetic and thermal conductivity techniques to accurately measure the oxygen content within a process gas.

Oxygen is a paramagnetic gas, which means that it is attracted to a magnetic field. It is this property that can be exploited to help determine the level of oxygen in many background gases. The magnetic susceptibility of oxygen decreases inversely with its temperature. Michell’s thermo-paramagnetic analyzer uses a temperature-controlled measuring chamber to create a flow of the process gas (known as a ‘magnetic wind’) between a pair of thermistors. This ‘magnetic wind’ alters the equilibrium temperature between the thermistors. The resulting change in the electrical resistance produces a signal that is proportional to the oxygen concentration in the sample gas.

Advantages of Thermo-Paramagnetic:

  • The thermo-paramagnetic sensor has no moving parts or consumable items which means lower cost of ownership
  • Units are calibrated specifically to maximize the accuracy at the required measurement range
  • Resistant to corrosive sample gases
  • Stable measurements
  • Good balance of price and performance
  • Compact design (especially for hazardous areas)

Thermal Conductivity

Thermal conductivity (TC) is a property of all gases. This can be exploited as each gas has a different TC value and is used to determine the level of one gas in a binary or pseudo-binary mix. Air is a good example of a pseudo binary mix as it has a fixed proportion of oxygen and nitrogen (both with very similar thermal conductivities).

Advantages of Thermal Conductivity:

  • Zero point stability of 0.5% of span per month means less frequent calibrations
  • No moving parts or consumable items
  • Stable and accurate measurement from symmetrical cell design
  • Cost effective measurement, especially in hazardous areas
  • Flexible technology allows many target gas measurements

How to choose between MSRS or MIPS

Below is a short guide to quickly establish which technology to use for your application:

Application Technology
Trace oxygen measurements in clean gases MSRS
Cost effective low temperature combustion control MIPS
Large scale incineration / combustion control MSRS
Area / vessel / duct monitoring of ambient air MIPS