User’s Guide
®
e-mail: [email protected]
LV-1101 & LV-1102
Non-Magnetic Liquid Level Switches
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The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected applications.
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Unpacking Instructions
Remove the Packing List and verify that you have received all equipment,
including the following (quantities in parentheses):
LV-1101 or LV-1102 level switch (1)
Operator’s Manual (1)
If you have any questions about the shipment, please call the OMEGA Customer
Service Department.
When you receive the shipment, inspect the container and equipment for signs of
damage. Note any evidence of rough handling in transit. Immediately report any
damage to the shipping agent.
NOTE
The carrier will not honor damage claims unless all shipping
material is saved for inspection. After examining and removing
contents, save packing material and carton in the event reship-
ment is necessary.
From the Technical Library of
i
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General Description
®
The OMEGA LV-1100 Series Liquid Level Switches feature a non-magnetic
design suitable for application where magnetic particles (ie: rust) are present.
The LV-1100 Series also feature rugged metal construction and a buoyancy
adjustment to allow the unit to be used with fluids down to SP.GR. = .06.
The LV-1101 features a single float design; the LV-1102 featurs a two float
design.
Features
• Rugged Industrial Design
• Non-Magnetic Design – Suitable For Rusty Environments
• 15A SPDT Switch Directly Controls Pump
• Continuously Adjustable Float Buoyancy Control to Allow Use in Fluids
With Specific Gravity Down to 0.6
• For Use With Water, Seawater, Sewage, Slurries, and Oils, Glycols, Soap
Solutions
• Model LV-1102 Also For Use With Chlorinated Organics, Medium
Concentrated Acids and Bases
NOTE
The LV-1101 has a Single Float Design; the LV-1102 has a Two
Float Design
1
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Specifications
Working Fluid Specific
Gravity Range:
Adjustable between 0.6 and 1.0+
Nom. Working
Pressure/Temperature:
300 PSIG @ 180˚F max.
Liquid Level Change
To Activate Switch:
1
/
4 inch
Relay Switch:
SPDT 15A @ 125 or 250 Vac; 10,000,000
operations median
Option “D”:
Dual SPDT relays; nominal difference flow
between the two relay actuation points is 5%
Electrical Cable Fitting:
Wetted Parts:
Water resistant strain relief for cable diameter
.250" .025"
Model LV-1101: red brass body, phosphor
bronze float shaft, 316 SS screws and washers,
302 SS float, Buna N seal and cork-chloroprene
gasket;
Model LV-1102: 316 SS body, float shaft,
screws and washers, 302 SS float, Viton seal
and Teflon gasket
Size:
Fits through 2" NPT hole
3 lbs.
Weight:
Installation Dimensions
2
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Installation
The LV-1101 Series Level Switches are supplied with a 2" x 1" TT bushing
threaded in place with 2 to 3 wraps of Teflon tape, which must be intact or
renewed if bushing and switch are separated before assembly in tank. Apply
a minimum of 2 to a maximum of 3 wraps of Teflon tape to the male threads
of the bushing. This is especially important if the unit is to be used in metal
fittings where coarse threads could bind if not lubricated.
Thread the unit into the tank and tighten until a good, no leak seal is obtained.
Make sure that the arrows molded on the body casting and printed on the
label are pointed vertically downward.
Remove the cover and test for proper switch action by applying multimeter
probes to the COM, NO and NC terminals of the microswitch while
actuating the switch lever arm.
The unit is supplied with the adjusting spring in the relaxed condition.
Leave the spring in the relaxed condition and fill the vessel until the float is
submerged. If the switch is actuated, proceed with the electrical wiring.
If the specific gravity of the working fluid is too low to lift the float and
actuate the switch, then the buoyancy adjustment feature must be used. To
adjust the buoyancy, turn the leadscrew CLOCKWISE until the switch is
actuated. Lower the liquid level until the float is clear of the liquid and the
switch is de-actuated. Raise the liquid level again until the float is submerged
and the switch actuates. If no further spring bias adjustment is required,
proceed with wiring.
Electrical Wiring
1. WIRING THE LV-1101/1102 WITH THE STRAIN RELIEF CABLE FITTING:
a. Remove the gland nut and tapered rubber grommet from the strain
relief cable fitting and slide them over the cable with the gland nut
going on first.
NOTE
Check the match of the outside diameter of the cable with the inside
diameter of the grommet. No more than .020" of play should be
evident.
1
/
b. Strip the outer jacket of the cable back 5 2 inches. Strip the insulation
from the individual conductors approximately 1 4".
/
c. Spade Lugs supplied with each switch. Remove them from the terminal
strip and crimp or solder to appropriate leads.
d. Feed cable up through cable fitting and attach leads to terminal strip per
Figure 1 or Figure 2 Wiring Schematics, below.
e. Push the rubber grommet into the conical hole in the cable fitting,
allowing enough cable to protrude from the opposite side to allow some
slack in the leads attached to the terminal strip. Grip the cable to
prevent rotation and thread the gland nut onto the cable fitting to seal
the grommet tightly to the cable.
3
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WARNING
THESE DEVICES ARE NOT EXPLOSION-PROOF. IF THESE LEVEL SWITCHES ARE INTENDED FOR USE
WITH FLAMMABLE LIQUIDS, OR IN HAZARDOUS AREAS, THE MECHANICAL RELAY INSIDE CAN BE
MADE INTRINSICALLY SAFE WHEN PROPERLY WIRED TO AN INTRINSICALLY SAFE RELAY SWITCH,
SUCH AS OMEGA’S LVC 550 SERIES INTRINSICALLY SAFE RELAYS. THEY MUST BE INSTALLED IN
ACCORDANCE WITH THE NATIONAL ELECTRIC CODE (NEC) BY PERSONNEL EXPERIENCED WITH
INTRINSIC SAFETY WIRING.
2. WIRING THE LV-1101/1102 W/OPTION ‘D’ WITH STRAIN RELIEF
CABLE FITTING.
a. Remove the gland nut and tapered rubber grommet from the strain
relief cable fitting and slide them over the cable with the gland nut
going on first.
NOTE
Check the match of the outside diameter of the cable with the
inside diameter of the grommet. No more than .020" of play
should be evident.
b. Strip the outer jacket of the cable back 2 inches. Strip the insulation from
the individual conductors approximately 1 4".
/
c. Each microswitch is supplied with 3 flag slip-on terminals. Remove
from the microswitch and crimp or solder to the appropriate leads.
d. Feed the cable up through the cable fitting and attach the leads to the
microswitches per Figure 1 or Figure 2 Wiring Schematics, below.
e. Push the rubber grommet into the conical hole in the cable fitting. Slide
the cable thru until the end of the jacket is flush with the inboard end of
the cable fitting. Grip the cable to prevent rotation and thread the gland
nut onto the cable fitting to seal the grommet tightly to the cable.
3. If using a fitting other than the strain relief cable fitting, attach the fitting to
the body and attach the conduit to the fitting and wire to local code per
Figure 1 or Figure 2 Wiring Schematics.
Microswitch actuation point may be monitored by an audible click or with
an OHM meter before connecting line power to the terminal strip or by
monitoring the voltage supplied to the load through the microswitch.
4
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Figure 1: Wiring Schematic for power applied to the load when the liquid
level is LOWER than the set point (power to the load is interrupted when the
liquid level is ABOVE the set point).
Figure 2: Wiring Schematic for power applied to the load when the liquid
level is HIGHER than the set point (power to the load is interrupted when the
liquid level is BELOW the set point).
5
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6
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Notes
7
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Where Do I Find Everything I Need for
Process Measurement and Control?
OMEGA…Of Course!
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