Hi-tech analyzer for measuring nitrox and trimix gases.
No helium sensor to replace - ever!
Features
Operation Principle
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.
Calibration
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.
Includes
- Ohm-meter plugin - to check bulbs and cables
- Voltmeter plug-in - to check batteries (lights, scooters...).
- Flow limiter for connection to the inflatore hose.¨
- Flow limiter for connection to the G 5/8" valve.
- Simple flow limiter for all valves.
- Worldwide Power Supply (also works with 9V battery - included)
- Hard and watertight StormCase.
OPTIONAL
Pressure sensor - the analyzer can measure pressure in the tank and gas mixture at the same time.
Firmware upgrades
The firmware in the He/O2 analyzer is continuously updated. The updates are user installable and can be downloaded here:
Download is performed using the FLIP program from theAtmel Corporation. You can obtain this program via this direct link FLIP 2.4.0. for Windows. If you are unable to dowload the program directly, you will find the newest version of FLIP on the firm's website at Atmel. Use of the FLIP program is described in the download manual.
current firmware HeO_1_7.hex
firmware upgrade manual
