3 … 4
Dimensions inch (mm)
1 Pressure connection (+)
2 Pressure connection (–)
3 Test nipple p (+)
AA-A2-6… Threaded connection
3.7 (94)
1/2” NPT
(1)
(2)
LK O 3,1
(78.8)
AA-A2-4… Hose connection
Test button
The AA-A2-6… threaded version is
equipped with a test button. When the
test button is pressed, the connection
to the 1/4" NPT pressure connection
is interrupted and the pressure below
the diaphragm is relieved. The micro-
switch of the pressure switch changes
the contact position from NO to NC. If
the test button is released, the pres-
sure below the diaphragm is built up
1/2” NPT
3.7 (94)
LK O 3,1
(78.8)
again and the microswitch changes to
its original position.
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