VHS-4, VHS-6 and VHS-250 Diffusion Pumps - Ideal Vacuum ...
VHS-4, VHS-6 and VHS-250 Diffusion Pumps - Ideal Vacuum ...
VHS-4, VHS-6 and VHS-250 Diffusion Pumps - Ideal Vacuum ...
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DRAFT 3/9/05<br />
1-2<br />
<strong>VHS</strong>-4, <strong>VHS</strong>-6 <strong>and</strong> <strong>VHS</strong>-<strong>250</strong> <strong>Diffusion</strong> <strong>Pumps</strong><br />
Backstreaming Rate at Pump Inlet 5x10 −4 mg/cm 2 /minute (with std cold cap)<br />
Electrical Requirements 120, 208, 240; 50/60 Hz; single phase<br />
Warm-up Time 10 minutes<br />
Cooldown Time<br />
(using Quick Cool Coil)<br />
Table 1-1 Pump Operational Specifications (Continued)<br />
10 minutes<br />
Fluid Charge <strong>VHS</strong>-4: 300 cc<br />
<strong>VHS</strong>-6 <strong>and</strong> <strong>VHS</strong>-<strong>250</strong>: 500 cc<br />
Cooling Water Requirements Maximum inlet temperature – 60/80 °F (15 - 26 °C)<br />
Maximum outlet temperature at foreline – 120 °F (48.9 °C)<br />
Flow rate – <strong>VHS</strong>-4: 0.15 gpm<br />
<strong>VHS</strong>-6 <strong>and</strong> <strong>VHS</strong>-<strong>250</strong>: 0.25 gpm<br />
Pressure drop across coils <strong>VHS</strong>-4: 4 psi<br />
<strong>VHS</strong>-6 <strong>and</strong> <strong>VHS</strong>-<strong>250</strong>: 15 psi<br />
Backing Pump Size <strong>VHS</strong>-4: ≥ 10 cfm for maximum throughput<br />
<strong>VHS</strong>-6 <strong>and</strong> <strong>VHS</strong>-<strong>250</strong>: 17 cfm for maximum throughput<br />
Recommended Jet Assembly 4-stage, self-aligning, stainless steel<br />
Foreline Baffle Stacked half moon<br />
Cold Cap Nickel-plated copper<br />
Water Connections 1/8" FPT<br />
Thermal Switches Manual reset at 300 °F
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