Murphy LS200N Installation Using Murphy External Float Chamber, Section, 00-02-0563, 01-11-06

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.

Section 15	00-02-0563
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