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Miniature d.c. vacuum pump
Vacuum news High-throughput pump with cooled cathodes Varian Associates have developed a new VacIon pump fitted with cooled cathodes that allow the pump to pump more gas by maintaining a greater speed at high pressures. It has been built for heavyduty pumping jobs such as exhausting vacuum tubes and cryogenic Dewars, and vacuum-switch processing. The manufacturers point out that the pump can be installed in 5 minutes and mounted in any position. It needs only a water source and a remotely located control unit for operation. One switch turns the pump on.
Model 5020 vacuum pumping system Designated the Model 5020, it incorporates advanced material and design concepts, which the makers claim to have significantly enhanced system cleanliness, performance, and reliability. Fully valved, trapped, and instrumented, all components are inert-gas fabricated entirely of T-304 non-magnetic stainless steel, with gauging and controls for monitoring vacuums from 1 torr to 2 × 10 -~° torr. Completely packaged in a trim, highly finished cabinet, with suitable mechanical roughing pump, all controls are located on the front panel for ease of operation and monitoring. A modular design facilitates building high-performance bell jar, deposition, or more complex systems by adding standard off-the-shelf accessories. The unit is claimed to be particularly suited for general research and scientific laboratory activity, including cryostat applications. The system provides a net pumping speed, at the system inlet, of approximately 70 litres/sec, and blank-off in the 10-10 torr range. Vacuum Engineering Company, Incorporated, USA Circle number 47 on Reader Enquiry Service card
Miniature d.c. vacuum pump A new compact 1½-inch outer diameter by 5 ~ - i n c h pump from Globe Industries is said to provide 2.5 inches of water vacuum regulated for a flow-rate of 0 to 40 ft3/min free air displacement at sea level. The unit is operable over a range of 40 to 400 ft3/min at reduced vacuum. It is powered by a reliable P M motor, 27 VDC, 1/50 H P at 7800 rpm and both a.c. and brushless d.c. (inverter) drives are also feasible.
Globe miniature vacuum pump
As designed the pump has been used in a camera to eliminate picture distortion and other possible applications include tape and paper hold-down in high-speed printers and readers. Globe Industries, Incorporated ( UK) Limited, U K Circle number 48 on Reader Enquiry Service card
Varian high-throughput pump Vacuums down to 10 -1° tort are said to be attainable by baking the pump and its magnet up to 450°C. Because it does not need pumping fluids, clean processing conditions are assured. The need for liquid nitrogen has been eliminated along with the need for a separate vacuum gauge; the pressure can be read on a meter on the control unit. The pump can also be used as a leak detector without the necessity for extra vacuum connections. Varian Associates, USA Circle number 49 on Reader Enquiry Service card Oil McLeod gauge A new lightweight, easily operated, low-pressure vacuum gauge based on the McLeod principle, but with dibutyl sebacate as the working fluid, has been introduced by Cenco Instruments Corporation. It was unveiled recently in New York City at the American Vacuum Society Symposium. The gauge is intended to supplement the conventional mercury McLeod gauges in laboratories and industrial applications, particularly where routine checking must be done, eg, pressure measurements on systems being pumped by oil-sealed rotary pumps. Fabricated of Pyrex glass and mounted on a panel, the new Cenco oil McLeod gauge is connected to the system under test by rubber tubing. A stop-cock and glass tabulation are provided on the gauge. In operation, an externally mounted magnet is used to actuate an internal glass plunger having an iron core. The action of the plunger displaces the volume of oil necessary to compress the sampled gas into the capillary. A graduated scale permits direct reading of pressure in millitorr. McLeod gauges with three different ranges are available. One with a measuring range of 0 to 20 millitorr has a sensitivity of 0.01 millitorr. Another gauge, this one with a sensitivity of 0.1 miUitorr, 29
Model 5020 vacuum pumping system Designated the Model 5020, it incorporates advanced material and design concepts, which the makers claim to have significantly enhanced system cleanliness, performance, and reliability. Fully valved, trapped, and instrumented, all components are inert-gas fabricated entirely of T-304 non-magnetic stainless steel, with gauging and controls for monitoring vacuums from 1 torr to 2 × 10 -~° torr. Completely packaged in a trim, highly finished cabinet, with suitable mechanical roughing pump, all controls are located on the front panel for ease of operation and monitoring. A modular design facilitates building high-performance bell jar, deposition, or more complex systems by adding standard off-the-shelf accessories. The unit is claimed to be particularly suited for general research and scientific laboratory activity, including cryostat applications. The system provides a net pumping speed, at the system inlet, of approximately 70 litres/sec, and blank-off in the 10-10 torr range. Vacuum Engineering Company, Incorporated, USA Circle number 47 on Reader Enquiry Service card
Miniature d.c. vacuum pump A new compact 1½-inch outer diameter by 5 ~ - i n c h pump from Globe Industries is said to provide 2.5 inches of water vacuum regulated for a flow-rate of 0 to 40 ft3/min free air displacement at sea level. The unit is operable over a range of 40 to 400 ft3/min at reduced vacuum. It is powered by a reliable P M motor, 27 VDC, 1/50 H P at 7800 rpm and both a.c. and brushless d.c. (inverter) drives are also feasible.
Globe miniature vacuum pump
As designed the pump has been used in a camera to eliminate picture distortion and other possible applications include tape and paper hold-down in high-speed printers and readers. Globe Industries, Incorporated ( UK) Limited, U K Circle number 48 on Reader Enquiry Service card
Varian high-throughput pump Vacuums down to 10 -1° tort are said to be attainable by baking the pump and its magnet up to 450°C. Because it does not need pumping fluids, clean processing conditions are assured. The need for liquid nitrogen has been eliminated along with the need for a separate vacuum gauge; the pressure can be read on a meter on the control unit. The pump can also be used as a leak detector without the necessity for extra vacuum connections. Varian Associates, USA Circle number 49 on Reader Enquiry Service card Oil McLeod gauge A new lightweight, easily operated, low-pressure vacuum gauge based on the McLeod principle, but with dibutyl sebacate as the working fluid, has been introduced by Cenco Instruments Corporation. It was unveiled recently in New York City at the American Vacuum Society Symposium. The gauge is intended to supplement the conventional mercury McLeod gauges in laboratories and industrial applications, particularly where routine checking must be done, eg, pressure measurements on systems being pumped by oil-sealed rotary pumps. Fabricated of Pyrex glass and mounted on a panel, the new Cenco oil McLeod gauge is connected to the system under test by rubber tubing. A stop-cock and glass tabulation are provided on the gauge. In operation, an externally mounted magnet is used to actuate an internal glass plunger having an iron core. The action of the plunger displaces the volume of oil necessary to compress the sampled gas into the capillary. A graduated scale permits direct reading of pressure in millitorr. McLeod gauges with three different ranges are available. One with a measuring range of 0 to 20 millitorr has a sensitivity of 0.01 millitorr. Another gauge, this one with a sensitivity of 0.1 miUitorr, 29