VHS-250 Diffusion Pump (CAT#: AM-LE-0622-Y)

The VHS-250 Diffusion Pump is manufactured by Agilent Technologies. The VHS series pumps are available in 4 inch, 6 inch, 250 mm, 10 inch and 400 mm sizes, and are the fastest and cleanest products in the same size diffusion pumps today.

Pumping rate, working range Pumping rate, AVS4.1 (1963): 2125 L/s air, 2660 L/s helium/hydrogen 3700 L/s air
Maximum pumping capacity: 2.6 T L/s (3.5 mbar L/s) in the working range, 3.5 T L/s (4.5 mbar L/s) at 0.01 Torr
Operating range: 1.2 x 10^-3 to less than 5 x 10^-9 torr (1.6 x 10^-3 to less than 6.5 x 10^-9 mbar)
Maximum pre-stage pressure: no load: 0.65 torr (0.85 mbar) full load: 0.55 torr (0.72 mbar)
Oil return rate, standard cooling cap: less than 5.0 x 10^-4 mg/cm2/min
Warm-up time: 10 min
Cooling time: 10 minutes (using quick cooling coil)
Oil injection volume: 500 cc — accurate pump oil packaging available
Electrical requirements: single-phase, 50/60 Hz, 120/208/240 VAC
Pump power: 2200 W
Cooling water requirement: 0.25 gpm (50 L/h)
Connection water cooling: 1/8 inch FPT tee

• Maximum pumping speed can be achieved
• Fractionating nozzles can purify pump oil
• Stainless steel pump body and nozzle
• Pump oil injection and drain assembly
• High level of withstand voltage
• Overheating protection
• The liquid level sight glass can quickly indicate the condition of the pump oil at any time
• Finned heating plate design increases surface area and extends pump oil life

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