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.
Technical Specifications
| Pumping speed, operating range Pumping speed, AVS 4.1 (1963) | 160 l/s air, 200 l/s He and H2 285 l/s air |
| Maximum Throughput | 0.60 T-l/s (0.80 mbar-l/s) in operating range, 0.70 T-l/s (0.93 mbar-l/s) @ 0.01 Torr |
| Operating Range | 3.7 x 10-3 to < 5 x 10-8 Torr, (4.9 x 10-3 to < 6.5 10-8 mbar) |
| Maximum Forepressure | No load: 0.55 Torr (0.71 mbar) Full load: 0.40 Torr (0.52 mbar) |
| Recommended Backing Pump | ≥ 5 cfm (8.5 m3/hr) |
| Backstreaming Rate, Standard Cold Cap | < 1 x 10-3 mg/cm2/min |
| Warmup Time | 15 minutes |
| Cooldown Time | 10 minutes (with quick cool coil) |
| Fluid Charge | 100 cc |
| Electrical Requirements | 1 ph, 50/60 Hz, 120/240 VAC |
| Pump Power | 450 watts |
| Cooling Water Requirements | 0.1 gpm (20 l/hr) at 60-80 °F (15-26 °C) |
| Water Connections | ⅛ in. FPT |
Speed Curve Graph
Pumping Speed Throughput
Outline Drawing
| Description | Wt. kg (lbs) | Part Number |
| HS-2 Pumps | ASA | |
| With standard cold cap | 20.0 (9.0) | 82906301 |
| With standard cold cap | 20.0 (9.0) | 82906302 |
| Accessories | Part Number | |
| Water-cooled baffle with ASA flanges | 10.0 (4.5) | F9453302 |
| Santovac 5 diffusion pump fluid, 500 cc pump fluid, 500 cc | 2.5 (1.1) | 695405005 |
| DC-702 diffusion pump fluid, 500 cc | 3.0 (1.4) | 695472005 |
| DC-704 diffusion pump fluid, 500 cc | 3.0 (1.4) | 695474005 |
| DC-705 diffusion pump fluid, 500 cc | 3.0 (1.4) | 695475005 |
| Instruction manual | 699901150 | |
| Replacement Parts (one heater required per pump) | ||
| 350 W, 120 V heater (HS2A) | 1.0 (0.5) | 647301100 |
| 350 W, 240 V heater (HS2A) | 1.0 (0.5) | 647301125 |
| 450 W, 120 V heater | 1.0 (0.5) | 647302125 |
| 450 W, 240 V heater | 1.0 (0.5) | 647302150 |
| Heater block (one required per pump) | 1.0 (0.5) | 82920001 |
| Heater platen (one required per pump) | 1.0 (0.5) | 82918301 |
| Replacement o-ring kit, (5 Inlet flange o-rings (butyl 2-338)) | 1.0 (0.5) | K0377159 |
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