Orion Instruments Atlas - Manual (Page 12)

12 46-638 Magnetic Liquid Level Indicators
1.9.2.1 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.
With mounting clamps loosened, position ORS reed
switch on the MLI body so that the centerline of the stain-
less steel tube which houses the switch is at the desired
switch point level. The switch should be oriented so that
the green ground screw is closest to the top of the MLI.
See Figure 8. Tighten the clamps so that the switch is
secured to the MLI. If required, place the insulation
between the MLI body and the switch before tightening
the clamps.
1.9.2.2 Mounting to an Aurora MLI
Follow procedure for mounting to Atlas or Gemini, but
ensure that the switch is positioned on the circumference
of the Aurora body as close to the indicator as possible.
1.9.2.3 Wiring
The leads protruding from the potted end of the switch
housing are color coded as follows:
White = Common
Black = Normally Closed
Red
= Normally Open
NOTE: For supply connections, use wire with a minimum rating of
+167° F (+75° C) as required by the process conditions. Use a
minimum of 14 AWG wire for power and ground field wires.
NOTE: Housing must be grounded via protective ground screw on
upper mounting tab.
Figure 9
Wiring of ORS
Reed Switch
Contact closure shown for
both conditions of the switch
relative to the magnetic float
FLOAT ABOVE SWITCH
FLOAT BELOW SWITCH
1 (RED)
C (WHITE)
C (WHITE)
2 (BLACK)
1 (RED)
2 (BLACK)
8-32 Ground Screw
3.00
(76.2)
3.00
(76.2)
1/2"
MNPT
1.00
(25.4)
0.84
(21.3)
Figure 8
inches (mm)