B75-1B20-KOG Datasheet, PDF (5/8 Pages) Magnetrol International, Inc. – Non-Bleed Switch For Liquid Level Switches

Magnet
(yellow
or red
dot)
5.0 Preventive Maintenance
5.0.1 Nozzle cleaning
Enclosing tube
Socket set
screw
1_{⁄16" Allen}
wrench
Air line
adapter
Nozzle
Flapper
Ball
Actuating rod
Figure 5
To clean the nozzle, follow the steps below:
1. Unscrew and remove the adapter. Refer to Figure 5.
Caution: Do not lose the ball which will drop out when the adapter
is removed.
2. The ball and actuating rod will now fall out when the
switch is tipped.
3. Unscrew the socket set screw with a ¹â„16" Allen wrench. This
will prevent damage to the flapper when performing step 4.
4. Insert a ¹â„16" diameter wire into the nozzle from the air line
connection side. Refer to Figure 6. The wire may be moved
back and forth to clean the opening of any accumulated
matter.
5. Reassemble the actuating rod, ball, and adapter; insert into
nozzle. Refer to Figure 5.
6. Securely tighten the air line adapter.
7. Readjust the flapper to its original position; refer to Nozzle
Flapper Readjustment procedure.
Enclosing tube
Socket set screw
1_{⁄16" Diameter wire}
5.0.2 Nozzle flapper readjustment
1. Connect an air line to the adapter.
2. Pressurize the air line.
3. Adjust the flapper with the socket set screw for the desired
action:
Direct Action
A. Hold the magnet against the enclosing tube.
B. Adjust the socket set screw with a ¹â„16" Allen wrench until
the air flow stops, plus an extra one-eighth turn.
Flapper
Nozzle
Figure 6
Reverse Action
A. Hold the magnet tab against the fall out stop. Refer to
Figure 3.
B. Adjust the socket set screw with a ¹â„16" Allen wrench until
the air flow stops.
4. Manually actuate the switch under pressure to assure its cor-
rect actuation. The unit is now ready for service.
5. Operate control at normal process conditions to verify
adjustments.
42-686 Series K Pneumatic Switch Mechanism
3