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MC • Karl Dungs
, Inc.
• AA...A1 • Edition 2016.03 • P/N 261392
Adjusting the Set Point
• Do NOT attempt to adjust the factory setting of the switch.
Breaking the seal affects the switches ability to act as a
differential switch.
Automatic Reset
• The NC contact of the AA...A1 breaks when pressure rises
above the set point. It makes automatically when pressure
falls below set point.
Annually check the switch for proper operation
Set Point Calibration
1. Connect a meter capable of r/- 0.1 ohms to the NC
and COM contacts.
2. Measure the resistance across the NC and COM contacts.
If the resistance is more than 1.0 ohm, the switch switch
should be replaced, since this indicates that the switch
contacts are starting to either corrode or carbonizing.
Operation & Adjustment
Maintenance & Testing
3. Apply pressure to the + air pressure connection, and
confirm that the NC contact breaks when pressure rises
above the set point and that the NO contact makes. The
NC contact will make automatically when pressure falls
below the set point pressure.
4. Connect a meter capable or r/- 0.1 ohms to the NO
and COM contacts.
5. Measure the resistance across the NO and COM contacts.
If the resistance is more than 1.0 ohm, the switch switch
should be replaced, since this indicates that the switch
contacts are starting to either corrode or carbonizing.
Accessories & Replacement
Accessory for pressure switch
Order No.
Mounting plate (flat plastic)
230301
NEMA Type 1 Cover (1pcs)
230216
NEMA Type 1 Cover (77 pcs)
231432
NEMA Type 2 Cover (1pcs)
230280
NEMA Type 2 Cover (200 pcs)
250107
NEMA Type 12 cover with 1/2 NPT conduit connection
225816
Karl Dungs GmbH & Co. KG
P.O. Box 12 29
D-73602 Schorndorf, Germany
Phone +49 (0)7181-804-0
Fax +49 (0)7181-804-166
e-mail [email protected]
Internet http://www.dungs.com
Karl Dungs, Inc.
3890 Pheasant Ridge Drive NE
Suite 150
Blaine, MN 55449, U.S.A.
Phone 763 582-1700
Fax 763 582-1799
e-mail [email protected]
Internet http://www.dungs.com/usa/
We reserve the right to make modifications in the course of technical development.
