No helium sensor to replace - ever!
Hi-tech analyzer for measuring nitrox and trimix gases. After inserting the analyzer adapter (included) to a bottle valve with a breathing mixture, the content of both oxygen and helium is shown as percentages directly on the display at the same time.
- Professional flow limiter for all valves.
- Worldwide Power Supply
- Hard and watertight Case
- Connection hose
- Ohmmeter plug-in
- Voltmeter plug-in
- Measuring cables
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.
A standard electrochemical sensor (R-17D) normally used in analyzers 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 analyzed 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 to eliminate the influence of the gas flow-rate.
Every analyzer produced is tesed in the complete range of acceptable oxygen and helium values. It is tested in air, pure oxygen and pure helium as well as in 12 different calibration mixtures.
The firmware in the He/O2 analyzer is continuously updated. The updates are user installable and can be downloaded here: