HS-20

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.

Technical Specifications

Pumping Speed, Operating Range Pumping Speed, AVS 4.1 (1963)	10,000 l/s air, 12,500 l/s He and H2 17,500 l/s Air
Maximum Throughput	12.5 T-l/s (16.7 mbar l/s) in operating range, 18 T-l/s (23 mbar-l/s) @ 0.01 torr
Operating Range	1.3 x 10-3 to 5 x 10-8 torr (1.7 x 10-3 to 6.5 x 10-8 mbar)
Maximum Forepressure	No Load: 0.65 torr (0.85 mbar) Full Load: 0.55 torr (0.72 mbar)
Recommended Backing Pump	ɛ100 cfm (170 m3/hr)
Backstreaming Rate, Standard Cold Cap	<1.5 x 10-3 mg/cm2/min
Warmup Time	45 minutes
Cooldown Time	85 minutes
Fluid Charge	5 quarts (4.7 liters)
Electrical Requirements	3 ph, 50/60 Hz, 240/415/480 VAC
Pump Power	12,000 watts
Cooling Water Requirements	1.5 gpm (300 l/hr) at 60-80°F (15-26°C)
Water Connections	1⁄4 in. FPT Tee
Recommended Fluid	DC-704

 

Speed Curve Graph

Pumping Speed/Cold Cap Pumping speed/Halo Baffle Throughput

Outline Drawing