NHS-35 Diffusion Pump
Available in 2 in. and 16 in. through 35 in. sizes, the low-cost HS-series pumps provide high speed, low ultimate pressure, high throughput, high tolerable forepressure, and low backstreaming. The HS-Series diffusion pumps come with full thermal protection and optional quick-cool coils. The 16 in. through 35 in. pumps come with sight glass/fill and drain assemblies, and are available with ASA or ISO flanges.
Product details
Features
- Five-stage stainless steel fractionating jet purifies fluid.
- High tolerable forepressure.
- Full thermal protection.
- Fluid-level sight glass provides quick indication of pump fluid status at all times.
- Foreline baffle prevents fluid loss to backing system.
- Optional halo baffle cold cap reduces backstreaming without adding height.
- Standard gauge port (NW-25) below inlet flange included.
- Optional quick cool coil.
How it works
Technology
Specifications
| Pumping Speed, Operating Range Pumping Speed, AVS 4.1 (1963) | 28,000 l/s air, 35,000 l/s He and H2
50,000 l/s Air |
| Maximum Throughput | 25 T-l/s (33 mbar l/s) in operating range, 35 T-l/s (45 mbar-l/s) @ 0.01 torr |
| Operating Range | 9 x 10-4 to < 5 x 10-8 torr (1.2 x 10-3 < 6.5 x 10-8 mbar) |
| Maximum Forepressure | No Load – 0.55 torr (0.71 mbar), Full Load – 0.40 torr (0.52 mbar) |
| Recommended Backing Pump | ≥ 300 cfm (510 m3/hr) |
| Backstreaming Rate, Standard Cold Cap | <5 x 10-4 mg/cm2/min |
| Warmup Time | 60 minutes |
| Cooldown Time | 180 minutes |
| Fluid Charge | 3 U.S. gallons (11.3 liters) |
| Electrical Requirements | 3 ph, 50/60 Hz, 240/415/480 VAC |
| Pump Power | 24,000 watts |
| Cooling Water Requirements | 4 gpm (800 l/hr) at 60-80°F (15-26°C) |
| Recommended Fluid | DC-704 |
