Leak Detector Varian 938-41 Porta Test Helium Leak Detector *working Condition!

US $4900

North Haven, Connecticut, United States
Oct 21st

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YOU ARE BIDDING ON ONE USED VARIAN LEAK DETECTOR IN GOOD WORKING CONDITION. THE UNIT WORKS WELL, JUST NEEDS TO BE RECALIBRATED SINCE IT HAS BEEN SITTING FOR A WHILE. ( NEEDS TO BE TUNED UP) FREIGHT SHIPPING AVAILABLE, BUYER SETS UP AND PAYS FOR FREIGHT DELIVERY The Varian 938-41 Porta-Test Helium Leak Detector is based on the Contra-Flow principle - a proven technique that takes advantage of the differences in maximum pressure ratios produced by the diffusion pump for gases of different molecular weights. This principle is implemented in the 938-41 leak detector by introducing helium (and other inlet gases such as those resuiting from a leak in the test piece) into the diffusion pump foreline rather than into the "normal" pump inlet as in conventional leak detectors. Helium, having a much lower pressure ratio than other gases. contained in air, diffuses backwards through the diffusion pump to reach the sensing tube where it is detected as a leak in the normal manner. Although the mechanical pump is also attached to the diffusion pump foreline and removes all inlet gases, including helium, there is no appreciable loss of sensitivity in the 938-41 leak detector. Features: Contra-Flow"" design allows small leaks to be detected without throttling No liquid nitrogen required Operation is controlled by rotation of only one handle through the operating cycle positions 50 segment, direct readout LED bar graph display with digital exponents capable of reading leaks in the 103 to 1010 atm cc/sec. range (helium) Residual background switch Modular construction: entire vacuum system held in place by 4 bolts Diffusion pump thermostat offers full protection against catastrophic failures