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ALL NEW OLED SCREEN
This analyser is intended primarily for use in checking the correct mixing of nitrox (air enriched with oxygen) and trimix (a mixture of air, helium and oxygen). After connecting the analyzer to a bottle with a breathing mixture, the content of oxygen and helium is shown as percentages directly on the display.
This trimx analyser reports "FOUL AIR" if the oxygen, nitrogen and helium can not be calculated due to contamination which is a major safety advantage over any other analyser.
It has internal firmware which can be user upgraded to add functionality. Never be out of date again!
Principles of operation
The same type of standard electrochemical sensor (R17D) normally used in analysers for diving is used to determine the oxygen content. The helium content is determined on the basis of measuring the speed of sound in the analysed mixture.
The speed of sound depends on the content of helium and oxygen, and on the temperature of the mixture. The dependence of the speed of sound on pressure is marginal and can be ignored under normal atmospheric pressure. At 0°C the speed of sound is approximately 970 m/s in pure helium, 330 m/s in air, and 315 m/s in pure oxygen. Raising the temperature by one degree raises the speed of sound by approximately 0.175%. The speed of sound in the mixture is described as a non-linear equation of temperature, oxygen content and helium content.
The speed of sound is measured directly as the time it takes for an acoustic impulse to travel between two microphones. This measurement is taken alternately in both directions so that it will be possible to eliminate the influence of the gas flow-rate.
Every analyser produced is tested in the complete range of acceptable oxygen and helium values. In addition to the testing of air, pure oxygen and pure helium undergo testing with 12 different calibration mixtures.
Calibration mixtures are gravimetrically mixed from pure basic gases and are exact to within two decimal places.
In addition to exactness, the accuracy of compensation for the influence of the flow-rate of the analysed gas is also tested.