Orion Instruments Atlas - Manual (Page 10)

10 46-638 Magnetic Liquid Level Indicators
1.9 Switch Installation
1.9.1 OES Cam Operated Switch
The Model OES snap switch is utilized to expand the con-
trol capabilities of Orion’s extensive line of magnetic level
indicators. This cam-operated double pole double throw
mechanism is clamp-mounted to the outside of the MLI.
This mounting style allows easy addition or repositioning
of switches without disruption of the process.
The OES switch(es) are pre-installed, calibrated, and
checked for proper orientation at the factory. Your unit
may be equipped with one or more switches for alarming
or control. To change the location of the switch in the
field, simply unscrew the clamp and slide the switch to a
new location. See Figure 4.
1.9.1.1 Mounting to an Atlas ™ or Gemini ™ MLI
Caution: If equipment is used in a manner not specified by the
manufacturer, protection provided by the equipment may
be impaired.
Remove the cover of the enclosure. Position the OES cam-
operated snap switch on the MLI body so that the center-
line of the switch enclosure is at the desired switch point
level. Ensure that the switch is oriented so that the arrow
on the switch mechanism is pointing toward the top of the
MLI. Install the clamps around the MLI and over the
mounting brackets on the top and bottom of the switch
housing. Tighten the clamps so that the switch is secured
to the MLI. Replace housing cover. If required, place the
insulation between the MLI body and the switch before
tightening the clamps.
1.9.1.2 Mounting to an Aurora ® MLI
The Aurora may be ordered with one or more OES clamp-
on switches. During assembly Orion can ensure proper
function of the switches. Special care must be taken when
adding OES switches to an Aurora after initial purchase.
For proper function, the switch must be located as close to
the internal float magnet as possible. This is achieved by
marking the location of the indicator on the Aurora body.
The indicator must be rotated on the chamber so that the
switch can be positioned closest to the float. Loosen the
indicator clamps, rotate the indicator 90 degrees around the
chamber and retighten the clamps. Mount the OES switch
where the indicator was originally located. Move the float,
or move level, to verify proper operation of the switch.
3.0 (76)
REF.
5.5 (139)
REF.
8.375 (212)
REF.
(2) 3/4" NPT
conduit connections
.5 (12)
REF.
Figure 4
Figure 5
Wiring of OES
cam operated switch
Contact closure is shown with the
magnetic float below the switch
INSTALL
THIS SIDE
UP
ORION INSTRUMENTS
FLOAT BELOW SWITCH
inches (mm)