A&D Weighing AD-1690 - Manual (Page 21)

19
(3) Exchanging the filter
The inside of the main unit is protected from invading dust by the air filter located on
the main unit bottom side.
Check the main unit regularly, replace the filter element or filter unit if necessary.
Turn the power supply of the main unit off by removing the AC adapter. And after
returning the inside of the leak tester to atmospheric pressure by removing the
pipette, follow this procedure.
1) Removing the filter unit
Invert the main unit and remove the
filter unit from the holder.
Pull the tubes out from both sides of
the filter unit.
(At this time, while pushing the
release ring lightly, pull the tube out
after pushing it in lightly.)
2) Replacing the filter element
When replacing only the filter element, follow this procedure:
1. Slide the red slide lock located on the
filter unit in opposite direction of the
arrow.
2. Turn the coupling in a counterclockwise
direction (180 degrees).
3. Remove the coupling from the filter
cover. Remove the old filter element
from the coupling.
4. Clean the dust from inside the filter
cover, if necessary.
5. After connecting the new filter element to the coupling,
insert it into the filter cover. Last, turn the coupling in a
clockwise direction.
6. Confirm that the positioning of the detent located on
the coupling and the slide lock match up and slide the
slide lock in the direction arrow. Confirm that the
coupling is securely locked.
Main unit
bottom side
1
2
Filter unit
Release
ring
Holder
Coupling
Filter element
Filter cover
Slide lock
1
2
5
3
6