Cabinet leak detectors
Two oil-free, automated cabinet leak detectors have been introduced by Varian.
The detectors test for leak rates down to 10-10 atm-cc/sec. and can read gross leaks up to 10 atm-cc/sec. The 947D and 948D models incorporate new high-speed, dry scroll-type roughing/backing and pumps. They also feature a Contra-Flow system design, which eliminates the need for liquid nitrogen and allows testing at high pressures.
Both leak detectors use dry pumps, which eliminates the cost and time required to check, change, and dispose of vacuum pump oil. In addition, the 947D and 948D offer automatic tuning and calibration.
Varian Vacuum Products, Lexington, MA (800) 882-7426