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Operation

Definition of switching

hysteresis ∆p

The pressure difference between the

upper and lower switching pressures.

Pressure Connection

Connection p2 (–) = lower pressure

Connection p1 (+) = higher pressure

AA...A1 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.

Application & Connection Examples

Connection p1

must remain open

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.

Prevent dirt from entering

into the device through con-

nection p1(+)

3 ... 5

Pressure

at meter

Connection p2

Connection p1

Filter monitoring

To monitor a filter, the AA...A1 can be

connected as shown above.

Setpoint tolerance

Connection p2

Upper switching

pressure

Lower switching

pressure

Connection p2

Connection p1

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.