Oxygen Analysers in Safe or Hazardous Areas

A range of linear and stable thermo-paramagnetic analysers for measurement of oxygen in a variety of applications with background gases such as Nitrogen, Carbon Dioxide, Methane and Hydrogen.

The stainless-steel sensor is housed in a wall-mounted IP55 case suitable for indoor use (XTP501) or a rugged IP66 casing (XTP601), making it suitable for a wide range of applications.

The XTP601 analyser can be supplied with flame arrestors, making it explosion-proof and suitable for use with flammable gases and/or installation in hazardous areas.

Highlights

• ATEX, IECEx, UKCA, TR CU Ex & cQPSus rated (XTP601)
• TP601 can be supplied to meet the requirements of IEC 61508 (SIL2 Capable)
• Touch-screen display allows calibration or adjustment without a hot work permit (XTP601)
• Measurement ranges from 0…0.5 % to 0…50 % O2 and 20/80/90…100 % O2
• Accuracy of better than ±1 % full scale (±0.2 % O2 between 80 and 100 %)
• Light guide to NAMUR 44 standard (XTP501 only)

Applications

• Monitoring inert blanketing gases for hydrocarbon processing
• Inert gas for pharmaceutical or chemical industries
• Biogas, waste, landfill and digester plants
• Furnace gas control in the steel industry
• N2 generators
• O2 generators

Technology

Oxygen is a paramagnetic gas, which means that it is attracted by a magnetic field.

This magnetic susceptibility is much greater for O2 than for most other gas molecules. Therefore, this physical property is ideal for determining the oxygen level in a wide range of background gases.

The XTP Series thermo-paramagnetic oxygen analyser combines the paramagnetic and thermal conductivity technologies to measure oxygen accurately.

The instrument is very stable, which gives the user confidence in the measurement. This is important in safety applications such as blanketing of vessels or reactors in chemical plants.

In addition to the stability of the Michell XTP sensor, the insensitivity to mechanical shock is another advantage of the thermo-paramagnetic technology.

As it relies solely upon fluctuations in magnetic fields, and not internal moving parts, the sensor will operate efficiently under a wide range of environmental conditions. It is suitable for installation where vibration or movement could pose a problem for other sensor types.

The measuring sensors are coated in borosilicate glass and mounted on platinum wire, giving excellent resistance to corrosion and less susceptibility to permeation of hydrogen or helium.

SIL2 Capable Option

The XTP601 can now be purchased meeting the requirements of IEC 61508 (SIL2 Capable). A supplementary SIL manual with the analyser allows the user to integrate the unit into their functional safety system.

High Sensor Stability Reduces Calibration Costs

The sensor design largely eliminates drift associated with other comparable devices, improving measurement stability. This allows longer calibration intervals and reduces both labour and consumable costs.

Reliable Long-Term Performance

The non-depleting sensor has no moving parts and is therefore unaffected by vibration or movement. This makes it suitable for remote and offshore installations and offers a low cost of ownership.