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PRESSURE CONNECTIONS AND MOUNTING AA..A2-4
AA...A2-4 Hose Connection
AA...A2-4 Mounting Procedure
• Use suitable hoses for the medium.
• Use a maximum 5/32” ID. hose
• Secure the hoses with a cable tie or a cable clip.
(1) Pressure connection (+)
(2) Pressure connection (–)
APPLICATION AND CONNECTION EXAMPLES
Connection p2Connection p1
must remain open
Connection p1
Connection p2
Connection p2 Connection p1
System vacuum monitor
AA...A1 is connected to the air duct with
the p2 (-) connection. p1 (+) is not con-
nected with the air duct.
Do not seal the p1 (+) connection; it must
be open to the atmosphere.
Caution: Prevent dirt from entering into
the device through connection p1(+).
Filter monitoring
To monitor a filter, the AA...A1 can be
connected as shown above.
Blower monitoring
For blower monitoring, connect con-
nection p1 (+) to the air duct on the
downstream side of the blower and con-
nection p2 (-) to the air duct upstream
of the blower.
Installation position: Standard installation position is vertical diaphragm. When installed horizontally, the pressure switch
trips at a pressure higher by approx. 0.2 in. W.C. When installed upside down, the pressure switch switches at a pressure
lower by approx. 0.2 in. W.C. When installed in other positions, the pressure switch switches at pressure deviating from the
set reference value by max. ± 0.2 in. W.C.
Definition of switching hysteresis ∆p
The pressure difference between the upper
and lower switching pressures.
OPERATION
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