An inexpensive, direct reading, electro-acoustical system is described wh±ch continuously monitors the amount of air present in helium gas being returned to a recovery/re-liquification installation. Contamination as small as 0.1 % is easily detectable. A common problem with the use of helium recovery systems is the inadvertent introduction of air into the recovery lines. We have constructed a device which determines gas purity b
To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.