Available in 4-inch, 6-inch, 250-mm, 10-inch, and 400-mm sizes, the VHS series pumps are the fastest and cleanest diffusion pumps of their size available today. The VHS series patented Bulge Contour doubles gas capture and maintains lower pressure. All VHS series pumps have sight glass/fill and drain assemblies for continuous monitoring and easy maintenance of pump fluid. Finned boilers increase surface area, prolonging pumping fluid life. Full thermal protection and quick-cool coils are also standard. The 4-inch, 6-inch, and 10-inch pumps can be ordered with ASA or ISO flanges, standard or extended cold caps, and a variety of voltages.
Technical Specifications
| Pumping Speed, Operating Range Pumping Speed, AVS 4.1 (1963) | 4,500 l/s Air, 5,625 l/s He/H2 8,000 l/s Air |
| Maximum Throughput | 6.3 T-l/s (8.4 mbar l/s) in operating range 7.5 T-l/s (10.0 mbar l/s) @ 0.01 torr |
| Operating Range | 1.4 x 10-3 to <5 x 10-9 torr (1.9 x 10-3 to <6.5 x 10-9 mbar) |
| Maximum Forepressure | No Load: 0.65 torr (0.85 mbar) Full Load: 0.55 torr (0.72 mbar) |
| Recommended Backing Pump | ≥30 cfm (51 m3/hr) |
| Backstreaming Rate, Standard Cold Cap | <1.0 x 10-3 mg/cm2/min |
| Warmup Time | 15 minutes |
| Cooldown Time | 25 minutes |
| Fluid Charge | 1,000 cc |
| Electrical Requirements | 3 ph, 50/60 Hz, 208/380/480 VAC |
| Pump Power | 4400 watts |
| Cooling Water Requirements | 0.40 gpm (80 l/hr) |
| Water Connections |
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Speed Curve Graph
Pumping Speed Throughput
Outline Drawing
| Description | Weight kg (lbs) | Part Number |
| VHS-400 Pump with standard cold cap | ||
| 208 V with ASA flanges | 75.0 (180.0) | K4816307 |
| 208 V with ISO flanges | 75.0 (180.0) | L9767307 |
| 240 V with ASA flanges | 75.0 (180.0) | K4816308 |
| 240 V with ISO flanges | 75.0 (180.0) | L9767308 |
| 380 V with ASA flanges | 75.0 (1800) | K4816326 |
| 380 V with ISO flanges | 75.0 (1800) | L9767326 |
| 480 V with ASA flanges | 75.0 (1800) | K4816309 |
| 480 V with ISO flanges | 75.0 (1800) | L9767309 |
| Accessories | ||
| DC-702 pump fluid, 500 cc (two required) | 1.4 (3.0) | 695472005 |
| DC-704 pump fluid, 500 cc (two required) | 1.4 (3.0) | 695474005 |
| DC-705 pump fluid, 500 cc (two required) | 1.4 (3.0) | 695475005 |
| Centering ring for ISO inlet flange, 400K | 0.5 (1.0) | IC400SV |
| Centering ring for ISO foreline flange, 63K | 0.5 (1.0) | IC63SV |
| Instruction manual | 699901023 | |
| Replacement Parts | ||
| Heater, 208 V 2200 W (two required per pump) | 0.5 (1.0) | 647310140 |
| Heater, 208 V 2550 W (two required per pump) | 0.5 (1.0) | 647310145 |
| Heater, 240 V 2200 W (two required per pump) | 0.5 (1.0) | 647310150 |
| Heater, 240 V 2550 W (two required per pump) | 0.5 (1.0) | 647310155 |
| Heater, 380 V 2200 W (two required per pump) | 0.5 (1.0) | 647310160 |
| Heater, 380 V 2550 W (two required per pump) | 0.5 (1.0) | 647310165 |
| Heater, 480 V 2200 W (two required per pump) | 0.5 (1.0) | 647310170 |
| Heater, 480 V 2550 W (two required per pump) | 0.5 (1.0) | 647310175 |
| Heater crush plate (one required per pump) | 1.0 (2.0) | K7667001 |
| Heater clamping plate (one required per pump) | 0.5 (1.0) | K4928001 |
| Replacement nickel heater wire | 0.5 (1.0) | 656179100 |
| O-ring kit, 1 for inlet (butyl, 2-385), 1 for foreline (butyl, 2-338), 10 for fill and drain (Viton, 2-113) | 0.5 (1.0) | K0377189 |
| Thermal switch (set at 300 °F/147 °C) | 0.5 (1.0) | 642906025 |
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