Murphy LS200N - Manual (Page 9)

Section 15 00-02-0563
01-11-06 - 5 -
Installation Using Murphy External Float Chamber
1. Install the Murphy float chamber 15051098 or
15051168 on the outside wall of the pressure vessel
using 1” NPT piping or use the mounting surface
with a bracket. Position the 2” NPT threaded
connection at the height where you want the level
switch to operate. The 2” NPT threaded connection
must be positioned away from the tank wall.
2. A tee and bleed valve are typically installed at the
bottom of the lower 1 inch pipe riser to allow draining
of the float chamber for servicing or replacement.
NOTE: A typical installation with blocking
and bleed valves is shown at right.
3. Install the LS200 or LS200N/NDVO/NDVOR in the
2” NPT connection of the float chamber. BE SURE
float travel is not restricted and that the float is tight
onto the float shaft.
4. To complete installation and wiring, follow the instructions for mounting directly into
wall of the vessel and for wiring.
Installation and Adjustment for Pneumatic Models
1. All pneumatic models operate on the vent
principle.
The pneumatic signal source must be
clean and dry “Instrument Quality” air or
natural gas.
The input pneumatic signal must be
regulated between 30 and 70 psi (207-483
kPa) [2 -4.83 bar]. If produced gas is used
as the signal source, it should be taken after
gas passes through the final scrubber. A
suitable filter must be positioned before the
LS200NDVO to prevent liquids and/or
particulates from entering the dump valve
operator.
NOTE: Check filter periodically for wear and tear and elements that
hamper the flow of the pneumatic signal.
2.
All pressure connections must be tight and maintained tight so as not to leak air/gas.