L-7758N page 1 of 4
Installation Instructions for L150, EL150K1, and
EL150EX Level SWICHGAGE
®
s for Engine Liquids
L-7758N
Revised 06-00
Section 15
(00-02-0171)
Description
The L150, EL150K1 and EL150EX Level SWICHGAGE
®
instruments are
a combination liquid level gauge and low limit switch. Each unit includes a
float chamber, an indicating pointer, a dial, and a low level contact. When
properly installed and maintained, the float operates the pointer which, in
turn, both indicates level during normal operation, and closes a switching
circuit if the level falls to the low-limit set point.
Applications
The primary use of these level SWICHGAGE
®
instruments is for engine
cooling systems, surge or expansion tanks, condenser radiator or vapor
phase systems, whether pressurized or atmospheric. These instruments can
also be used to monitor lube oil, hydraulic fluid or diesel fuel reservoirs and
activate alarms and/or shutdown at a predetermined minimum level.
These instruments are built for low pressure systems.
Cold Weather Warning
BEFORE FREEZING WEATHER COMES, CHECK TO BE
SURE YOUR L150 OR EL150 SERIES COOLANT LEVEL
SWICHGAGE®IS FILLED WITH ANTIFREEZE SOLUTION
THE SAME AS YOUR ENGINE BLOCK AND RADIATOR. On many
engines, such as condenser radiator systems, the coolant in your level
SWICHGAGE®remains static until the level falls to drain point. When
‘winterizing’ it’s a good idea to make certain all water drains from your level
SWICHGAGE
®
, to check against clogged connections, and then BE SURE IT
REFILLS WITH ANTIFREEZE. FAILURE TO OBSERVE THIS
PRECAUTION COULD RESULT IN EQUIPMENT DAMAGE.
Please read the following instructions before installing. A visual inspection for damage during shipping is recommended
before mounting. It is your responsibility to have a qualified person install the unit.
GENERAL INFORMATION
L150 EL150EX
Float
• Brass
••
• Stainless Steel (AISI 304)
•
Electrical Connection
• (1) 16 AWG x 24 in. (1.5 mm2x 610 mm)
•
with terminals.
• (3) 18 AWG x 14 in. (1.0 mm2x 356 mm)
•
• Terminal Block
•
CSA Listed for Hazardous Location:
Class I, Division 1, Groups C & D.
•
O-Rings: Saturated Nitrile, suitable for coolant or
hydrocarbons. Maximum temperature
•• •
250°F (120°C)
Cover Gasket
• Neo-cork
••
• Buna
•
Case
• Die cast aluminum, polyurethane coated
••
• Sand cast aluminum, painted.
•
Specifications
Lens
• Polycarbonate
••
• Tempered glass
•
Contact Rating
• Pilot duty 2 A @ 30 VAC/DC resistive SPST
•
• SPDT rated 10 A @ 125 VAC; 0.5 A @ 125 VDC;
10 A @ 30 VDC
••
Maximum Working Pressure:
•• •
25 psi (172 kPa) [1.72 bar]
Vent Tube: 1/4 x 5 in. (6 x 127 mm) with fittings.
•• •
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.
L150
EL150K1
**Products covered by this literature comply with EMC Council directive 89/336/EEC regarding
electromagnetic compatibility except as noted.
**
CAUTION:
Certain danger to human and to equipment
such as applied in a mobile or marine application may occur
if some equipment is stopped without pre-warning. It is
therefore, recommended that monitored functions be limited
to alarm only or to alarm before shutdown in such applications.
WARNING
L-7758N page 2 of 4
4-13/16 in.
(122 mm)
3-25/32 in.
(96 mm)
4-1/2 in.
(114 mm)
Mounting Holes
1/2 NPT
1/2 NPT
Back Connect
1/4 NPT
2-3/4 in.
(70 mm)
9/32 in. (7 mm)
diameter holes
2 places
Mounting
Ears (2)
Test
Knob
5-9/16 in.
(141 mm)
4-11/16 in.
(119 mm)
5-1/2 in.
(140 mm)
Mounting Holes
1/2 NPT
1/2 NPT
Back Connect
6 in.
(152 mm)
1/2 NPT
Connection
1/2 NPT
3-3/8 in.
(86 mm)
5/16 in. (8 mm)
diameter holes
2 places
DIMENSIONS
PS FITTINGS INSTALLATION
LEVEL SWICHGAGE
®
INSTALLATION
WARNING:
Perform all installations with the power source “OFF”. Be sure engine and radiator have
cooled and coolant pressure has been relieved. SEVERE BURNS can result. Never remove radiator cap on a hot
A Murphy PS fitting is used when there is no threaded fitting in the top
tank of the radiator to attach tubing for the L150/EL150 series level
SWICHGAGE
®
.
• P/N 15-00-0107 (PS) Accepts 1/4 in. (6 mm) O.D. copper tubing.
• P/N 15-01-0167 (PS Barbed) Barbed fitting accepts 1/4 in.
(6 mm) I.D. flexible tubing and hose clamp.
• P/N 15-01-0202 (PS-D) Accepts 1/2 in. (13 mm) I.D. hose;
1/4 in. (6 mm) copper tube.
1. Determine the entry point into the radiator top tank. See Level
SWICHGAGE
®
Installation for proper location. Drill 5/8 in. (16 mm)
diameter hole in top tank of radiator. Be sure chips do not fall inside
the tank. Remove any burrs on the hole wall.
2. Insert the rubber grommet of the PS Blind Hole Fitting. Tighten the
jam nut while holding the fitting from turning in the hole. The jam
nut will pull the tapered grommet into the hole from the inside of the
top tank causing the grommet to expand and seal the hole.
3. Attach the appropriate tubing or hose for the PS Fitting.
EL150EX
15-00-0107
15-01-0167
15-01-0202
L150
EL150K1
IMPORTANT:
Operation of the L150/EL150K1 is different for a
pressurized cooling system than for an atmospheric (non-pressurized)
system. Installation of the L150/EL150K1 is only slightly different for each
system. Connection of the top tube connection is the major difference.
Differences will be noted in the installation instructions.
Installation Notes
1. All top radiator connections must be away from the return hose
turbulence.
2. All bottom radiator connections must be away from the suction hose.
3. The L150/EL150K1 must be attached to a mounting plate on the radiator
or other framework.
CAUTION:
If the L150/EL150K1 is NOT attached to the radiator, use
high temperature quality flexible hose for the top and bottom connections
to maintain the shock mounting protection for the radiator.
Pressurized and Atmospheric Systems
1. Drain the cooling system.
2. For a PRESSURIZED COOLING
SYSTEM (Figure 1) the shutdown
point is determined by the entry point
A of the tube connection into the top
tank. The engine will shutdown when
coolant level drops below this
connection (see step 4).
If the radiator has a SHALLOW
UPPER TANK, you can make entry
from the top as illustrated in Figure 2.
Insert the copper tube until it is slightly
above the core. Secure the fitting.
4-13/16 in.
(122 mm)
4-15/16 in.
(125 mm)
4-1/2 in.
(114 mm)
Mounting Holes
1/2 NPT
1/2 NPT
Back Connect
1/4 NPT
2-3/4 in.
(70 mm)
9/32 in. (7 mm)
diameter holes
2 places
11/16 in.
(17 mm)
Test
Knob
A
Figure 1: Pressurized System
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