Instruction manual

VHS-4, VHS-6 and VHS-250 Diffusion Pumps
D R A F T 6 / 1 8 / 1 3
21
Heater circuit resistance (ohms) VHS-4: 1450 watts
120 V – 10
208 V – 29.8
240 V – 39.7
VHS-6 and VHS-250: 2200 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
Shipping Weight VHS-4: 55 pounds
VHS-6 and VHS-250: 75 pounds
Table 1-1 Pump Operational Specifications (Continued)