19/20
NT 1001-F00 10.10 C12 A - C18 A e
13. OPTIONS
13.1 Liquid detector
The liquid detector works with single and double ply bellow.
It is install on the vent circuit (see § PROTECTION OF
THE PUMP INSTALLATION).
In case of floaded suction or during the cleaning pro-
cess, a bellow puncture will fill the transmission with
liquid. The liquid detector will inform the user when a bel-
low pucture occur.
13.2 Bellow monitoring system
The bellow monitoring system called (BMS) works only
with double ply bellow.
Working principle : During the transmission assembly, a
gas pressure (argon) is introduced in between the bellow
ply. A pressure switch is connected on the bellow's gas
filling cavity and all the circuit is sealed. This operation is
done by the factory and any technical operation will
break the sealings (see picture) and avoid the warranty.
The gas pressure is 0,2 bar (2,9 psi) above the maxi-
mum acceptable pressure on the bellow under working
condition.
Any puncture in either one of the two metallic bellows leads
to a pressure drop. When the pressure decrease under the
pressure switch setting, it cuts the electrical circuit.
To connect the electrical pressure switch, follow the
manufacturer instruction.
Vented cap supplied
with the pump that
must be reused
Liquid detector with
certification level
adapted to the ambience
(ATEX if necessary)
T connection
Pump bearing
support
Pressure
switch
Sealings
