46-624 Series 3 Liquid Level Switches ASME B31.1 Construction
9
NOTE: Level control, connections and pipe lines need not be
removed from the tank.
6. Loosen enclosing tube nut with a
15
⁄
16
" wrench. Unscrew
enclosing tube counterclockwise (switch and housing base
will rotate also) until it is free. Refer to
Figure 6
on page 8.
7. Lift enclosing tube, switch, and base off float chamber.
Jam nuts and attraction sleeve are now accessible.
8. Measure the distance “D” from the top edge of the upper
jam nuts to the top of the float stem. Refer to
Figure 8
.
Record this measurement.
9. Loosen and remove upper jam nuts, guide washer, and
attraction sleeve.
10. Loosen and adjust lower jam nuts to the desired position.
Tighten lower jam nuts securely. Refer to
Figure 8
.
11. Replace attraction sleeve on stem.
12. Replace upper jam nuts and guide washer on the stem in
the position previously noted. Tighten upper jam nuts
securely. Refer to
Figure 8
.
NOTE: Using a new enclosing tube gasket when reassembling
enclosing tube to the chamber. Make certain that all gasket
surfaces are thoroughly cleaned to allow proper gasket
seating. Coat enclosing tube threads with “anti-seizing”
compound.
13. Replace enclosing tube, switch, and base on chamber. Screw
tube clockwise until tightened to 200–225 foot-pounds
of torque.
14. Rotate switch housing to correct position and tighten set
screw at base of switch housing. Refer to
Figure 4
on
page 6.
15. Bring supply wires through conduit outlet. Follow steps 5
through 10 in
Wiring, Section 2.5
on pages 6 and 7.
16. Test switch action by varying liquid level in float chamber.
NOTE: If switch mechanism fails to function properly, check vertical
alignment of control housing and consult installation bulletin
on switch mechanism. If the unit still fails to function properly,
consult the factory.
3.2
High Level Controls
On high level controls the switch trips on the higher actu-
ation point and resets on the lower actuation point.
Caution:
On high level controls, widening the differential requires
raising the trip point a proportional amount. The reset
point will remain the same.
Slight
play (gap)
Must be
allowed
(0.03"
typical)
Position of
bottom
jam nuts
(normal
factory
setting)
Replace in same position
Maximum gap
setting (applies to
models having a
single switch
mechanism with
a single magnet
actuator only)
1.00
(25 mm)
Drop bottom
jam nuts to
increase gap
setting (refer
to above
instructions)
Figure 7
Figure 8
D
