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AA-A2… SPDT differential pressure switch in pressure and vacuum ranges. The differential pressure acts via the diaphragm
against the force of the setting spring on the microswitch. The pressure switch operates without any auxiliary power
TYPE: AA-A2-4 Hose connection TYPE: AA-A2-6 Threaded connection
7 PSI (500 mbar)
5/32" (4.6 mm) dia. positive 1/4" NPT positive
5/32" (4.6 mm) dia. negative 1/8" NPT negative
5/32" (4.6 mm) test connection
Ambient temperature -40 °F to +140 °F (-40 °C to +60 °C)
Medium temperature -40 °F to +140 °F (-40 °C to +60 °C)
Housing: Polycarbonate
Switch: Polycarbonate
Diaphragm: NBR-based rubber
Switching contact: Silver (Ag)
AC eff. min. 24 V max. 250 V
DC min. 24 V max. 48 V
AC 5A resistive @ 120 Vac
AC 3A inductive @ 120 Vac
DC min. 20 mA @ 24 Vdc
DC max. 1A @ 24 Vdc
Screw terminals via 1/2" NPT conduit connection
NEMA Type 4
±15% switching point deviation referred to set point, adjusted as pressure rises,
vertical diaphragm position
Multipoised
Specifications
Max. operating pressure
Pressure connection
Temperature range
Materials
Electrical ratings
Current ratings
Electrical connection
Enclosure rating
Setting tolerance
Installation position
AA-A2… switching function
As pressure rises:
1 NC opens, 2 NO closes
As pressure falls:
1 NC closes, 2 NO opens
Definition of switching hysteresis ∆p
The pressure difference between the upper
and lower switching pressures.
Installation position: Standard installation position is vertical upright diaphragm. When installed horizontally, the pres-
sure switch switches 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.
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