The devices will also work with air and inert gas. The valves consume 0.67 W, have a 5 to 10-msec response time, and run on voltages of 6, 12, or 24 Vdc. The valves are ultrasonically cleaned, assembled, inspected, and tested with a positive-pressure HEPA filtration system.

Clippard Instrument Laboratory Inc., 7390 Colerain Ave., Cincinnati, OH 45239, (513) 521-4261,