6
44-604 Top Mounting Liquid Level Switches
Internal
Circuit
(Right) Switch
1
2
3
Load
Load
Close on high level
Common
Close on
low level
Line
4
5
6
Internal Circuit
(Left) Switch
Load
Load
Close on high level
Common
Close on
low level
Line
Set
Screw
Screw
Screw
Figure 3
Housing Set Screws
Figure 4
Terminal Connections
DPDT Switch Mechanism
Series B, C, and D
2.4
Wiring
Caution:
All Top Mounting units are shipped from the factory with
the enclosing tube tightened and the switch housing set
screw locked to the enclosing tube. Failure to loosen the
set screw prior to repositioning the supply and output
connections may cause the enclosing tube to loosen,
resulting in possible leakage of the process liquid or vapor.
Top mounting controls are shipped with the conduit entry
of the switch housing placed 180° opposite the tank con-
nections to simplify installation in most cases. If the loca-
tion of the conduit entry on the level switch is appropriate
to the installation, proceed to Step 4 to begin wiring the
unit. If another configuration is desired, the switch housing
can be easily rotated by first following Steps 1, 2, and 3.
NOTE: A switch or circuit breaker shall be installed in close proximity
to equipment and within easy reach of operator. It shall be
marked as the disconnecting device for the equipment.
1. Loosen set screw(s) at base of switch housing. Refer to
Figure 3.
2. Switch housing may be rotated 360° to allow correct posi-
tioning of conduit outlet.
3. Tighten set screw(s) at base of switch housing.
4. Unscrew and remove switch housing cover. The threads
have been lubricated to facilitate removal.
NOTE: For supply connections use wire with a minimum rating of
75° C, as required by process conditions. Use a minimum
of 14 AWG wire for power and ground field wires. On high
temperature applications (above 250° F [121° C] at mounting
flange or bushing), high temperature wire should be used
between control and first junction box located in a cooler area.
On non-hazardous applications, flexible conduit may be used
between the control and the first junction box.
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 4, or your switch
bulletin for this information.
