XTP601 Oxygen Analyzer

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Oxygen Analyzer for Safe or Hazardous Areas

A robust, linear and stable oxygen analyzer for measurements in gases such as hydrogen, nitrogen or carbon dioxide. The sensor is housed in an IP66 rugged casing, making it suitable for a wide range of applications. When supplied with flame arrestors, the analyzer becomes explosion-proof and suitable for use in hazardous areas.


  • Compact and rugged design with an EExd enclosure and isolated 4-20 mA output
  • ATEX, IECEx, CCSAUS, TC, TR & Ex hazardous area certified
  • Touch-screen display allows calibration or adjustment without the need for a hot works permit
  • Intrinsic error (accuracy) is better than 1% full scale
  • Zero span stability better than 0.25% of span per month
  • Increased protection against contamination due to cell design
  • Low cost of ownership due to minimal maintenance and no consumeable parts
  • Ranges available: 0-1% up to 0-50% & 20, 80 or 90- 100%

Michell XTP601 Oxygen Analyzer for Safe or Hazardous Areas When a process oxygen application demands high accuracy and stability, along with low maintenance cost, paramagnetic oxygen technology is usually preferred. If, in addition, the application calls for a rugged and reliable, corrosion resistant analyzer, the thermo-paramagnetic principle of Michell’s new XTP601 series makes it the instrument of choice.

The XTP601 series oxygen analyzers from Michell Instruments are designed to measure the percentage of oxygen in process gases. Using thermo-paramagnetic technology, the sensor is reliable and highly stable. The XTP601 is housed in an explosion-proof case and is rated ATEX Zone 1 for use in hazardous areas. For installation in non-hazardous areas a general purpose version is available.


Excellent accuracy
Oxygen measurements are highly susceptible to pressure variations because they are generally based on the partial pressure of oxygen. For a non-corrected analyzer, a 1% change in atmospheric pressure will result in a 1% change in the reading. The XTP601 has barometric pressure compensation fitted as standard and is ranged specifically to customers’ needs to offer the best accuracy where it matters. For instance, in a 0-1% range the XTP601 is accurate to ±0.02% O2. Higher sensor stability reduces calibration costs The sensor in Michell’s XTP601 analyzer largely eliminates thermistor drift associated with other comparable devices, improving the stability of the measurement. This allows longer calibration intervals and reduces both labor and consumable costs.

Reliable Long-Term Performance

In some installations, such as offshore or on board oil tankers, the movement and vibrations present could affect the moving parts of other kinds of sensors. The thermo-paramagnetic sensor has no moving parts making it ideal for these applications.

Non-Depleting Technology

The sensor does not require routine replacement and is not poisoned like electro-chemical cells. This will save downtime and maintenance costs. The cell performance is consistent and does not drift as it is not consumed by the process.

The non-depleting sensor reduces service intervals and no regular replacement of cells is required. The casing unscrews to allow for easy access to the sensor, enabling maintenance of the modular components to be carried out quickly and efficiently.

Easy Installation with Local Display for use in Hazardous Areas

The XTP601 provides two isolated 4-20 mA outputs and is housed in a robust and weather-proof casing, allowing the analyzer to be placed at the point of measurement.

The closer the analyzer can be installed to the sample point, the better, for many reasons. These include, faster overall speed of response (for safety), less sample line or cabling (saves cost) greater choice of installation points (flexibility). Also having a local display does not require two operators (or walking back and forth to the control room) for maintenance or diagnostics.

External Sensor Input

The unit has the facility to accept a 4-20 mA signal from an external source such as dew point sensor, pressure transmitter, temperature probe or user-defined sensor, and display it on the screen. This saves the cost of buying and installing an external display for another parameter that only requires occasional visual inspection.


Thermo-Paramagnetic Sensor

Oxygen is a paramagnetic gas, which means that it is attracted by a magnetic field. This magnetic susceptibility is much greater for O2 than that of most other gas molecules and therefore this physical property is ideal for the determination of the level of oxygen in a wide range of background gases.

The XTP601 series is a thermo-paramagnetic oxygen analyzer where the combination of paramagnetic and thermal conductivity technology is exploited to accurately measure oxygen. 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 XTP601 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.