Orion Instruments Atlas - Manual (Page 11)

46-638 Magnetic Liquid Level Indicators 11
1.9.1.3 Wiring
The lower conduit opening is protected with a plastic
shipping plug. The upper opening is sealed with a steel
plug. If it is preferable to wire through the upper conduit
entry, the steel plug may be moved to the lower opening.
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 in
base of housing.
Caution: In hazardous areas, do not power the unit until the conduit
is sealed and the enclosure is screwed down securely.
The DPDT switch has two sets of contacts. See Figure 5
on page 7 and label on mechanism. To wire switch, strip
about
1 ⁄
2
" of insulation from end of wire. Using a flat head
screwdriver or pliers, push orange tab away from the wire
opening on the terminal block. DO NOT pry up on the
orange tab as damage to the terminal block may result.
Insert wire into opening and release tab. Check that the
wire is securely fastened within the terminal block. Repeat
for balance of connections.
1.9.2 ORS Electric Reed Switch
The Model ORS reed switch is available to augment the
control capabilities of Orion’s extensive line of magnetic
level indicators. Housed in an explosion proof stainless
steel enclosure, the ORS mounts to the outside of the
MLI via clamps. This mounting style allows addition or
repositioning of switches at any time, without disruption
of the process.
The ORS 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.