Fisher ALPHA 1-2 LDplus Operating Manual page 37

Instructions for the connection with centring rings and clamping
flanges
Small flange connections which are not mounted properly between
the aggregates or to connect hoses are often the reason for serious
vacuum problems.
Please loosen the connection and replace the centring ring (with
sealing ring inside) centrically between the flange connections. Seal
the connection with the clamping flange by fastening the wing nut.
Please take care that the centring ring does not get out of place and
does not tilt.
30 • Installation and Commissioning of the Unit
Operating Manual Freeze Dryer ALPHA 1-2 LDplus