Physics Today can assume no responsibility for their accuracy. The DUO 20M can be used as a backing pump for conventional turbopumps, in pumping stations, and for analytical equipment. They operate in automatic, manual, vent, and service modes. Both controllers include dual thermocouple gauge displays, automatic vent, protected manual control, three user-defined process control set points, a monitor for bell jar position, and password protection for programmed parameters and set points. The ACP-3000 also features a cryopump temperature sensor and regeneration control.
Nonvolatile memory protects preset parameters from power failure.
For any of those volumes, the DVR-1000 provides a pressure regulation of better than 0.1 torr for vacuum environments up to atmospheric pressure. Serial communications allow PC control of the regulator and logging of pressure data. There is no need for cold traps because the water tank dilutes condensates from vapors. An optional vacuum regulator is available. The Genesis modular vacuum valve system from Nor-Cal Products includes vacuum valves, fittings, heaters, and accessories.