Instruction manual

VHS-4, VHS-6 and VHS-250 Diffusion Pumps
D R A F T 6 / 1 8 / 1 3
23
Table 1-2 lists the VHS-4 dimensions.
Table 1-2 VHS-4 Dimensions
ASA ISO Conflat
in mm in mm in mm
Height 18.05 458 18.05 458 18.05 458
Centerline to Centerline 10.62 270 10.62 270 10.62 270
Flange Face to Flange Face 5.03 128 5.03 128 5.03 128
EIectrlc8I Box Height 8.63 219 8.63 219 8.63 219
Sight Glass,
Degrees from Foreline
90° clockwise 90° clockwise 90° clockwise
Electrical Box,
Degrees from Foreline
30° counterclockwise 30° counterclockwise 30° counterclockwise
Inlet Flange, Nominal Size 4” ASA ISO -160K 8” CFF
Inlet Flange, OD 9.00 229 7.09 180 7.96 202
Inlet Flange, ID 5.91 150 5.78 147 5.91 150
Inlet Flange, Thickness 0.50 13 0.47 12 0.93 24
Inlet Flange, Bolt Circle 7.50 191 N/A N/A 7.12 181
Inlet Flange, Number of Holes 8 N/A 20
Inlet Range, Hole Size 0.69 18 N/A N/A .33 8
O-ring Groove ID 6.06 154 N/A N/A N/A N/A
O-ring Groove Width 0.18 4 N/A N/A N/A N/A
Foreline Flange, Nominal Size KF40 KF-40 2¾ CFF
OD 2.16 55 2.16 55 2.73 69
ID 1.38 35 1.38 35 1.38 35
Thickness 0.20 5 0.20 5 1.38 35
Bolt Circle N/A N/A N/A N/A 2.31 59
Number of Holes N/A N/A N/A N/A 6
Hole Size N/A N/A N/A N/A 0.27 7
O-ring Groove ID N/A N/A N/A N/A N/A N/A
O-ring Groove Width N/A N/A N/A N/A N/A N/A