VHS-250 Diffusion Pump
Technical Specifications
| Pumping Speed, Operating Range Pumping Speed, AVS 4.1 (1963) | 2,125 l/s Air, 2,660 l/s He/H2 3,700 l/s Air |
| Maximum Throughput | 2.6 T-l/s (3.5 mbar-l/s) in operating range, 3.5 T-l/s (4.5 mbar l/s) @ 0.01 torr |
| Operating Range | 1.2 x 10-3 to <5 x 10-9 torr (1.6 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 | ≥17 cfm (29 m3/hr) |
| Backstreaming Rate, Standard Cold Cap | < 5.0 x 10-4 mg/cm2/min |
| Warmup Time | 10 minutes |
| Cooldown Time | 10 minutes (with quick cool coil) |
| Fluid Charge | 500 cc – exact fluid charge available |
| Electrical Requirements | 1 ph, 50/60 Hz, 120/208/240 VAC |
| Pump Power | 2200 watts |
| Cooling Water Requirements | 0.25 gpm (50 l/hr) |
| Water Connections | 1⁄8 in. FPT Tee |