FW Murphy LS200 Series User manual

00-02-0671
2016-04-14
Section 15
LS200, LS200N and
LS200NDVOR Series Liquid Level
Switches
Installation and Operations Manual

In order to consistently bring you the highest quality, full-featured products, we reserve the right to change our
specifications and designs at any time. The latest version of this manual can be found at www.fwmurphy.com.
CAUTION: LS200 Series parts are not interchangeable with other
Murphy liquid level products. Damage caused by using incorrect
parts is not covered by our Limited Warranty.
Please read the following information before installing. A visual
inspection for damage during shipping is recommended before
mounting.
BEFORE BEGINNING INSTALLATION OF THIS MURPHY
PRODUCT:
Disconnect all electrical power to the machine.
Make sure the machine cannot operate during installation.
Follow all safety warnings of the machine manufacturer.
Read and follow all installation instructions.
OBSERVE all pressure and electrical ratings and requirements for
the devices and the operating environment.
BE SURE all pressure HAS BEEN REMOVED from the vessel
before opening any pressure connections.
Please contact Enovation Controls immediately if you have any
questions.

Table of Contents
Product Information...................................................................................................................1
Features.......................................................................................................................1
LS200...........................................................................................................................1
LS200NDVOR..............................................................................................................2
LS200NDVO ................................................................................................................3
LS200N ........................................................................................................................3
Pressure Vessel Installation: LS200 and LS200N ................................................................4
Direct Installation into the Wall of the Pressure Vessel ................................................4
Installation with a Weld Collar ......................................................................................5
Installation Using Murphy External Float Chamber ......................................................5
Installation and Adjustment for Pneumatic Models.......................................................6
Replacing and Installing the DVO Assembly .........................................................................7
Models LS200NDVO & LS200NDVOR ........................................................................7
Electrical......................................................................................................................................9
Replacement Parts.....................................................................................................................9
Accessories ..............................................................................................................................10
15050375: Weld Collar..............................................................................................10
55050617: DVU150/DVU175 Adapter Bushing.........................................................10
15051098: External Float Chamber ..........................................................................11
15700799: Series 100 External Float Chamber ........................................................11
15000478: Float Shaft Extension for the LS200........................................................11
The Murphy Gas Compressor Scrubber Level System (SLS)....................................12
Specifications ...........................................................................................................................13
All Models...................................................................................................................13
LS200.........................................................................................................................13
LS200NDVOR............................................................................................................13
LS200NDVO ..............................................................................................................13
LS200 N .....................................................................................................................13
Approximate Shipping Weights and Dimensions........................................................13

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Product Information
Features
Listed for Class I, Div. 1, Grp. C & D locations
Canadian Registration Number OF1476.2
Minimum Allowable Specific Gravity for LS200
Table 1
LS200 Minimum Allowable Specific Gravity
Model
Float Extension
length
Pressure
Specific
Gravity
(inch)
(psi)
0
0.55
LS200
1
2000
0.7
6
1
0
0.63
LS200NDVO
1
2000
0.73
6
1.02
*Note: The min. allowable SG will decrease with a decrease in operating
pressure
LS200
LS200 Liquid Level Switches with 2-inch NPT mounting are float activated to operate an
electrical SPDT snap-switch (optional DPDT on some models) for alarm or shutdown of an
engine or electric motor. The LS200 connects directly into the vessel wall and can be used
with a Murphy weld collar (P/N 15050375) or Murphy external float chamber.
Refer to the specification table below for product dimensions.
LS200
A
Table 2
LS200
10.18 in. (259 mm)
B
3.44 in. (87 mm)
C
1.75 in. (44 mm)
D
3.36 in. (85 mm)
E
2 NPT
NOTE: Refer to Table 3 and Table 4 for clearances.

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LS200NDVOR
LS200NDVOR is a float-activated, pneumatic-vent level device used to operate dump valves
or similar devices.
The LS200NDVOR provides a 2-inch NPT mounting with a pneumatic output for interfacing
with pneumatic devices such as our Murphy pneumatic dump valve or with other pneumatic
instrumentation.
Pneumatic media devices require clean, dry, instrument-quality air or gas. This unit is supplied
with a pressure regulator, filter and Murphy 20BPG pressure gage for improved system life and
trouble-free operation.
LS200NDVOR pneumatic level switch with dump valve operator, pressure regulator and
gage

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LS200NDVO
Shown below is the Pneumatic level switch with Dump Valve Operator (DVO) without the
pressure regulator (for those applications where the system provides a filter regulator for
instrument-quality air or gas as the control medium).
LS200NDVO pneumatic level switch with dump valve operator
LS200N
Shown below is the Pneumatic level switch without the DVO and filter regulator.
LS200N pneumatic level switch

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Pressure Vessel Installation: LS200 and LS200N
Direct Installation into the Wall of the Pressure Vessel
CAUTION: Determine that the float travel is not obstructed by the
coupling in the vessel wall, internal baffles, etc.
Refer to tables 1, 2, 3 and 4 for application data.
1.
Make certain the float and extension are tight.
2.
Before installing the level switch, use of a pipe thread sealant is
recommended. Screw the unit directly into the threaded
connection in the wall of the pressure vessel.
3.
For LS200, verify that the electrical connection is positioned at
the bottom.
4.
For LS200N the 1/8-inch NPT pneumatic connection should be
on top, the 3/8-inch NPT vent connection should be on the
bottom.
5.
Make the electrical wiring connections according to appropriate
wiring diagrams for the alarm or shut-down system to be used.
The electrical connection is ½-inch-14 NPT.
6.
Ensure all electrical connections are insulated and the cover is
fully installed before reconnecting electrical power.
7.
Verify all pressure connections are tight before pressurizing the system.
Clearance Reference Tables
Table 3
Pipe Data
Nom. Size
(inches)
O.D.
(inches)
Schedule
Number
Wall Thickness
(inches)
Inside Diameter
(inches)
3
3.5
40ST
0.216
3.068
3
3.5
80XS
0.3
2.9
4
4.5
40ST
0.237
4.026
4
4.5
80XS
0.337
3.826
Table 4
Minimum Clearance
Product Name
Insertion Depth (inches)
Vertical Clearance (inches)
Std.
w/ 1” Extension
Std.
w/ 1” Extension
LS 200
4.6
5.6
2.8
3.15
LS 200N
5.43
6.4
3.3
3.9
L 1200 *
4.65
5.7
3.9
4.55
L 1200N *
5.6
6.7
5.3
6.9
* Included for reference. These products have been discontinued.

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Installation with a Weld Collar
1.
The weld collar, P/N 15050375, must be welded into the wall of
the pressure vessel according to code standards and good
welding practices.
2.
Follow above instructions for installation directly into the wall of
the pressure vessel.
NOTE: Weld collar 15050375 can be used ONLY with
model LS200.
Installation Using Murphy External Float Chamber
1.
Install the Murphy float chamber 15051098 or
15700799 on the outside wall of the pressure vessel
using 1-inch NPT piping or use the mounting surface
with a bracket. Position the 2-inch NPT threaded
connection at the height where you want the level
switch to operate. The 2-inch 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-
inch 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.
CAUTION: Float extensions cannot be used with float chambers.

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Installation and Adjustment for Pneumatic Models
1.
All pneumatic models operate on the vent
principle. The pneumatic signal source must
be clean, 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.
CAUTION: Avoid excessive Teflon tape which may inhibit proper
operation.
Each switch is set to vent on rising level at the factory and should
not need field adjustment. For testing the system, we have
provided the red Manual Valve Operator on the operator pilot valve.
3. Valve seat adjustment can be made if air/gas begins to leak. Care should be
taken when adjusting as only slight movement is necessary to stop the
leakage; excessive force will bind the seating mechanism. See the instruction
below for adjustment.