Instr Manual: EXT Compound Molecular Pumps: EXT70H ... - Edwards

7.4.12 EXT70H/ISO63 interstage-port accessory kitOn the EXT70H/ISO63 pump, the interstage-port in the pump-envelope is blanked off. You canremove the blanking cap and fit the interstage-port accessory to upgrade the pump to anEXT70Hi pump, so that you can use the interstage-port of the pump as described in Section 3.3.6.The accessory kit consists of an ‘O’ ring and a flange; the flange has an inlet strainer to prevent theentry of debris into the pump. To fit the accessory:Use a suitable pin-spanner to remove the blanking plug from the interstage-port. The holesin the blanking plug are 3.2 mm in diameter, and the centres of the holes are 14 mm apart.Fit the ‘O’ ring supplied, then use a 27 mm diameter ‘C’ spanner to screw the flange into theinterstage-port; the holes in the flange accessory are 3.2 mm in diameter.Tighten the flange sufficiently, to prevent the flange being loosened by vibration or stresstransmitted from pipelines connected to the flange.AccessoryItem NumberEXT70H/ISO63 interstage-port accessory kitB580-69-001Pin-spannerB279-29-02927 mm ‘C’ spanner B279-29-028EXT Compound Molecular Pumps 39