ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual page 805

Installation
5.3 Connecting pipes/hoses (vacuum
pump/compressor)
Mufflers:
The pump-motor units are delivered with mufflers
(indicated with arrows in the following
illustrations) for the inlet and discharge
connections as standard equipment.
With single-impeller pump-motor units, the
mufflers are already mounted on delivery.
Fig. 2: 2BH721 ... 2BH761 (single-impeller pump-
motor units)
With two-impeller and three-impeller pump-
motor units, the inlet-side muffler is included
loose for packaging-related reasons and must be
mounted by the operator.
Fig. 3: 2BH722 ... 2BH762 (two-impeller pump-
motor units with two-stage design)
Fig. 4: 2BH723 ... 2BH763 (three-impeller pump-
motor units with three-stage design)
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