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Agilent Varian VHS-250 Diffusion High Vacuum Pump - REBUILT

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Agilent Varian VHS-250 Diffusion High Vacuum Pump - REBUILT
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Agilent Varian VHS-250 Diffusion High Vacuum Pump - REBUILT

We also carry Agilent Varian diffusion pump LN2 traps and baffles and valves. 

Specifications VHS-250
Power Rating 2,200 Watts
Optimum Operating Range (Torr) 7x10−4 to < 5x10−9 (9 x 10-4 to < 6 x 10-9 mbars)
Maximum Pumping Speed (l/s) Air – 3,700 with std cold cap; Helium – 4,600
Maximum Throughput (Torr-l/s) 2.6 (3.5 mbar-l/s) in operating range
3.5 (4.5 mbar-l/s) @0.01 Torr
Maximum Forepressure No Load – 0.65 Torr (.87 mbars)
Full Load – 0.55 Torr (.73 mbars)
Backstreaming Rate at Pump Inlet 5x10−4 mg/cm2/minute (with std cold cap)
Electrical Requirements 120, 208, 240; 50/60 Hz; single phase
Warmup time 10 minutes
Cooldown time (using Quick Cool Coil) 10 minutes
Fluid Charge 500 cc
Cooling Water Requirements Maximum inlet temperature – 60/80°F (15 - 26°C)
Maximum outlet temperature at foreline – 120°F (48.9 °C)
Flow rate - 0.25 gpm
Pressure drop across coils 15 psi
Backing Pump Size 17 cfm for maximum throughput
Recommended Jet Assembly 4-stage, self-aligning, stainless steel
Foreline Baffle Stacked half moon
Cold Cap Nickel-plated copper
Water Connections 1/8" FPT
Thermal Switches Manual reset at 300°F (149°C
Environmental Maximum ambient temperature 113°F (45°C
Installation Indoor use, Installation Category 2, Pollution Degree 2
Altitude 6,562’ (2,000 m)
Heater circuit resistance (ohms) 2,200 watts
120 V – 6.5
208 V – 19.6
240 V – 26.1
Clearance (for heater removal) 6" minimum
Materials Body, Flanges, Foreline, Baffle – stainless steel
Jet Assembly – stainless steel
Body Cooling Coils – copper
Quick Cooling Coil – stainless steel
Cold Cap – nickel-plated copper
Weight 75 lbs

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Agilent Varian VHS-250 Diffusion High Vacuum Pump - REBUILT

K0543301 VHS-250 with standard cold cap 120 V
K0543306 VHS-250 with standard cold cap 208 V
K0543302 VHS-250 with standard cold cap 240 V
Accessories

695405005: Santovac 5 diffusion pump fluid, 500 cc (exact pump charge)
699901020: Installation and Operation Manual

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