HS-20
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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.
- Five-stage fractionating jet purifies pumping fluid and assures low base pressure.
- High tolerable forepressure.
- Full thermal protection.
- Fluid-level sight glass provides quick indication of pump fluid status at all times.
- Fill and drain assembly for pump oil.
- Standard gauge port (NW-25) below inlet flange included.
- Foreline baffle prevents loss of fluid into backing pump system.
- Optional halo baffle reduces backstreaming without adding height.
| Description | Weight kg (lbs) | Part Number |
| HS-20 Pump with standard cold cap | ||
| 240 V, ASA flanges | 264.0 (580.0) | 84341308 |
| 240 V, ISO flanges | 264.0 (580.0) | L5922308 |
| 415 V, ASA flanges | 264.0 (580.0) | 84341326 |
| 415 V, 8,100 W, ISO flanges | 264.0 (580.0) | L5922326 |
| 480 V, ASA flanges | 264.0 (580.0) | 84341309 |
| 480 V, ISO flanges | 264.0 (580.0) | L5922309 |
| HS-20 Pump with halo baffle | ||
| 240 V, ASA flanges | 264.0 (580.0) | 84341318 |
| 240 V, ISO flanges | 264.0 (580.0) | L5922318 |
| 415 V, ASA flanges | 264.0 (580.0) | 84341336 |
| 415 V, ISO flanges | 264.0 (580.0) | L5922336 |
| 480 V, ASA flanges | 264.0 (580.0) | 84341319 |
| 480 V, ISO flanges | 264.0 (580.0) | L5922319 |
| Accessories | ||
| Water-cooled halo baffle | 11.0 (25.0) | K01855320 |
| Water-cooled baffle with ASA flanges | 100.0 (215.0) | R1154301 |
| Water-cooled baffle with ISO flanges | 70.0 (160.0) | R1155301 |
| Centering ring for ISO foreline flange, 160K | 0.5 (1.0) | IC160SV |
| Instruction manual | 699901140 | |
| Replacement Parts (six heaters required per pump) | ||
| Heater, 240/415 V 2000 W with leads | 0.5 (1.0) | 647320020 |
| Heater, 480 V 2000 W with leads | 0.5 (1.0) | 647320030 |
| Heater, 240/415 V 2000 W no leads, pre-May 1990 pumps | 0.5 (1.0) | 647320060 |
| Heater, 480 V 2000 W no leads, pre-May 1990 pumps | 0.5 (1.0) | 647320070 |
| Heater crush plate (replace one with each new heater) | 0.5 (1.0) | K7108001 |
| Heater insulator(one required per pump) | 0.5 (1.0) | L6514001 |
| Heater clamping plate (six required per pump) | 4.0 (8.0) | K7107001 |
| O-ring kit for ASA pump, 1 for inlet (butyl, 84349002), 1 for foreline (buna, 2-432), 8 for fill and drain (Viton, 2-213) | 0.5 (1.0) | K0377165 |
| Upper thermal switch (set at 185 °F/85 °C) | 0.5 (1.0) | K9050001 |
| Lower thermal switch (set at 390 °F/199 °C) | 0.5 (1.0) | K9050002 |
| Heater Retrofit Kits (for pumps built before May, 1990) | ||
| HS-20 pump, 240 V | 13.6 (30.0) | L6392308 |
| HS-20 pump, 415 V | 13.6 (30.0) | L6392326 |
| HS-20 pump, 480 V | 13.6 (30.0) | L6392309 |
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Diffusions Pumps
