VHS-4 Diffusion Pump
Technical Specifications
| Pumping Speed, Operating Range Pumping Speed, AVS 4.1 (1963) | 750 l/s air, 940 l/s He/H2 1,200 l/s Air |
| Maximum Throughput | 1.5 T-l/s (2.0 mbar-l/s) in operating range, 2.5 T-l/s (3.2 mbar-l/s) @ 0.01 torr |
| Operating Range | 2 x 10-3 to <5 x 10-9 torr (2.7 x 10-3 to <6.5 x 10-9 mbar) |
| Maximum Forepressure | No Load: 0.65 torr (0.86 mbar) Full Load: 0.55 torr (0.73 mbar) |
| Recommended Backing Pump | ≥10 cfm (17 m3/hr) |
| Backstreaming Rate, Standard Cold Cap | <5 x 10-4 mg/cm2/min |
| Warmup Time | 10 minutes |
| Cooldown Time | 10 minutes (with quick cool coil) |
| Fluid Charge | 300 cc |
| Electrical Requirements | 1 ph, 50/60 Hz, 120/208/240 VAC |
| Pump Power | 1450 watts |
| Cooling Water Requirements | 0.15 gpm (30 l/hr) at 60-80°F (15-26°C) |
| Water Connections | 1⁄8 in. FPT Tee |