Télécommunciations

ANSWER:
C’est facile si vous utilisez la sonde pour gaine 8712, fournie en tant qu’accessoire du détecteur de fuite à hydrogène 9012XRS. Commencer par injecter de l’hydrogène comme gaz détecteur (5%H2/95%N2) dans le câble téléphonique pressurisé. Introduire ensuite la sonde 8712 dans la gaine. La sonde pour gaine est une tige de fibre de verre de 100 m de long, dont la pointe porte le capteur. Le capteur indique immédiatement où se trouve la fuite et il suffit de mesurer la longueur en mètres de la tige qui a été introduite dans la gaine. Ceci vous donne la position de la fuite.
ANSWER:
Yes, hydrogen takes the easiest way up, but will ALSO go straight up from the leak. In real tests you may in a case like this get a strong indication where you know there is no cable, which will tell you that it may just be a puff of hydrogen taking the easiest way up, through a drain, a fissure or something similar. Just go back to where you know the cable is buried and continue your search and I guarantee that you will find your leak.
ANSWER:
No, the gas mix of 5% hydrogen in nitrogen can never spontaneously re-concentrate and become explosive. The hydrogen can never reach higher concentrations in the man-hole than the concentration in the gas-bottle. This is according to the 2:nd law of thermo dynamics. There are better reasons to stop smoking.
ANSWER:
Yes, Hydrogen penetrates anything if you wait long enough. Concrete is normally quite porous as is also many other materials we normally think are solid. Practically we have experience in finding leaks where the tracer gas has had to pass through dirt, mud, gravel, snow, concrete, asphalt and various types of tiles and cobble-stone paving