46-635 External Cage Displacer Actuated Liquid Level Switches
7
5. The switch terminals are located next to the conduit outlet
to facilitate wiring. Bring supply wires through conduit
outlet. Route extra wire around enclosing tube under the
baffle plate, and connect them to the proper terminals.
Refer to the wiring diagram, Figure 5 or 6, or your switch
bulletin for this information.
6. Dress wiring to ensure no interference or contact with
switch, or replacement of switch housing cover.
OBSERVE ALL APPLICABLE ELECTRICAL CODES
AND PROPER WIRING PROCEDURES.
Prevent moisture seepage into the enclosure by installing
approved seal-drain fittings in the conduit run leading into
the unit.
Caution: In hazardous areas, do not power the unit until the
conduit is sealed and the enclosure cover is screwed
down securely.
7. Replace housing cover.
8. If control has been furnished with an explosion proof or
moisture proof switch housing, it must be sealed at the
conduit outlet with a suitable compound or non-hardening
sealant to prevent entrance of air.
9. 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 furnished.
10. Check cover to base fit to be certain gasketed joint is tight.
A positive seal is necessary to prevent infiltration of mois-
ture laden air or corrosive gasses into switch housing.
3.0 Preventive Maintenance
Periodic inspections are a necessary means to keep your
level control in good working order. This control is a safety
device to protect the valuable equipment it serves.
Therefore, a systematic program of “preventive mainte-
nance” must be implemented when the control is placed
into service. If the following sections on “what to do” and
“what to avoid” are observed, your control will provide
reliable protection of your equipment for many years.
3.1 What to do
3.1.1 Keep control clean
Be sure the switch housing cover is always in place on the
control. This cover is designed to keep dust and dirt from
interfering with switch mechanism operation. In addition,
it protects against damaging moisture and acts as a safety
feature by keeping bare wires and terminals from being
exposed. Should the housing cover or any seals become
damaged or misplaced, obtain a replacement immediately.
Figure 6
Terminal Connections
DPDT Switch Mechanism
Series HS
I
nternal Circuit
(
Right) Switch
1
2
3
L
oad
Load
Close on low level
C
ommon
C
lose on high level
Line
4
5
6
I
nternal Circuit
(
Left) Switch
L
oad
Load
Close on low level
C
ommon
C
lose on high level
Line
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