Magnetrol B60 Installation And Operating Manual - page 5
46-605 Flanged External Cage Float Actuated Liquid Level Switches
5
1.4
Mounting
Caution:
This instrument is intended for use in Installation
Category
II
, Pollution Degree 2 locations.
Adjust piping as required to bring control to a vertical
position. Magnetrol
®
controls must be mounted within 3°
of vertical in all directions. A three-degree slant is noticeable
by eye, but installation should be checked with a spirit
level on top and/or sides of float chamber.
Caution:
Never insulate the switch housing of the level control.
Installation and maintenance of tandem float models are
accomplished in much the same manner as described for
standard models. Additional consideration must be given
to the piping arrangement to allow for alignment of the
two switch actuating level marks on the float chamber
with the desired levels in the vessel.
Caution:
Operation of all buoyancy type level devices should be
done in such a way as to minimize the action of dynamic
forces on the float or displacer sensing element. Good
practice for reducing the likelihood of damage to the con-
trol is to equalize pressure across the device slowly.
1.5
Wiring
Caution:
All Flanged Float Cage 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.
Flanged float cage controls are shipped with the conduit
entry of the switch housing placed 180° opposite the tank
connections to simplify most installations. If this configu-
ration 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 equipment.
1. Loosen set screw(s) at base of switch housing. Refer to
Figure 1
.
2. Switch housing may be rotated 360° to allow correct
positioning 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
+167° F (+75° C) as required by process conditions. Use a
minimum of 14 AWG wire for power and ground field wires.
Set
Screw
Screw
Figure 1