Murphy LS200 사용자 설명서

5 - 

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. 

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. 

All pressure connections must be tight and maintained tight so as not to leak air/gas.