Manual

34  Installation and Commissioning of the Unit Operating Manual Freeze Dryer ALPHA 1-4 LDplus / ALPHA 2-4 LDplus
The accessory components are connected to the
ALPHA 1-4 / 2-4 LD
plus
freeze-dryer according to the connection
diagram. Please observe the following:
Centring rings and clamping flanges with wing nuts are used as
connecting elements (small-flange connection according to ISO
28403 or DIN 2861, see the following instructions).
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.
Loosen the connection and place the centring ring (with sealing ring
inside) in a centred manner between the flange connections.. Seal
the connection with the clamping ring by tightening the wing nut.
Ensure that the centring ring neither slips out of place nor gets
jammed.
Small flange and centring ring Small flange with centring ring
and small flange
Attaching the clamping ring Tightened clamping ring