9
44-604 Top Mounting Liquid Level Switches
7. With switch housing and enclosing tube removed, jam
nuts and attraction sleeve are accessible. Measure position
of upper jam nuts from stem end; then loosen and remove
upper jam nuts, guide washer, and attraction sleeve.
8. Loosen and adjust lower jam nuts to desired position.
Make certain jam nuts are retightened securely.
NOTE: Use new enclosing tube gasket in assembly of switch housing
to the mounting bushing or flange. Refer to
Sections 5.4.1.1
and
5.4.2.1
for enclosing tube gasket part numbers.
9. Test switch actuation by varying liquid level in tank or
vessel.
Caution:
Instructions given are for standard base model units which
use a single magnet switch mechanism only. No differen-
tial adjustment should be attempted on tandem float mod-
els in the field. Switch actuation levels have been set at
the factory to meet specific customer specifications.
Variations in actual conditions from design conditions
usually requires special control modifications. Consult
with the factory or local representative for assistance.
For access to bottom
jam nuts, mark position,
remove top jam nuts,
washer, and attracting
sleeve.
Slight play (gap)
must be allowed
(.03" [.8 mm] typical)
Position of bottom
jam nuts (normal
factory setting)
Replace in
same position
Drop bottom jam nuts to
increase gap setting
(see instructions below)
0.50"
(13 mm)
Maximum gap setting
(Applies to models having
a single switch mechanism
with a single magnet
actuator only)
Float
Figure 7
Differential
adjustment
Figure 6
Normal Factory Setting
(minimum differential)
CAUTION:
After increasing gap setting, be certain to
check for proper operation of switch mechanism by rais-
ing and lowering float assembly. Magnet must snap
cleanly, with additional float movement available after
magnet snaps.
