LV132
Electro-Optic Conductivity Sensor
Instruction Sheet M1800/1299
DESCRIPTION
The compact, LV132 Conductivity Sensor, with built-in electronics, is ideal for leak detection applications. It combines electro-optic
and conductive technologies and can discriminate between hydrocarbons and water. The sensor is compatible with a broad range of
conductive and non-conductive liquids. It is also suitable for high, low or intermediate level detection in practically any tank - large or
small. Installation is simple and quick through the tank top, bottom or side. With no moving parts, the sensor is ideal for interstitial
applications. The pull ring facilitates easy installation in double-wall tanks and pipes, yet can be removed for use in 1/4" NPT holes.
SENSOR OPERATING PRINCIPLE
The sensor has the capability of discriminating between conductive and non-conductive liquids, such as water and gasoline. Con-
ductivity probes are used in conjunction with an optical prism, consisting of a light-emitting diode and phototransistor. The prism
detects liquid via a loss of light intensity on the phototransistor (due to refraction). The sensor has two outputs: one for conductive
liquid and one for non-conductive liquid. Both outputs are TTL/CMOS compatible.
WARNING
The nature of the sensor is that it is a non-voltage producing device, containing limited energy-storing components. However, since its
primary use is in a hazardous location, an appropriate intrinsically safe interface device must be used and installed in strict accordance
with the National Electrical Code and applicable OMEGA technical brochure and instruction bulletin. Failure to observe this warning could
result in serious injury or damages.
UNPACKING
Remove the Packing List and verify that you have received all equipment. If you have any questions about the shipment, please call
the OMEGA Customer Service Department at 1-800-622-2378 or (203) 359-1660.
When you receive the shipment, inspect the container and equipment for any 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 any claims unless all shipping material is saved for their examination. After examining and removing
contents, save packing material and carton in the event reshipment is necessary.
INSTALLATION - Running of Field Wire
A. The conductors of the intrinsically safe circuit should be sealed in a rigid metal conduit at the point where the wiring enters the
hazardous area. The wiring and contacting device should be such that conductive dusts in the area will not close the circuit in
place of the contacts.
B. Hazardous area field wiring will store energy due to distributed capacitance and inductance in proportion to its length. The
maximum run of cable has been defined at 750 feet between barrier and sensor.
C. Shielded cable is not required, but if used in the application, the shield must be returned to ground. The shield must be con-
nected to barrier earth ground.
D. Intrinsically safe wiring must be installed in accordance with Article 504 of the NEC, ANSI/NFPA-70 or CEC Part 1, as applicable.
All intrinsically safe wiring must have 0.01 inch minimum insulation thickness. Non-intrinsically safe wiring cannot be run in
conduit or open raceways together with intrinsically safe wiring.
U.L. Entity Parameters
For CSA intrinsic safety approval,
Vmax ≥ Voc (barrier)
Terminal
Imax
38V 150mA .052µ
150mA .052µ
Ci
Vmax
Li
0
the following barriers must be used:
SBG111950 and SBG111954
Red/Black
Green/Black
White/Black
Imax ≥ Isc (barrier)
C
C
38V
0
Ci + cable < ( A barrier)
L
L
38V 150mA .052µ
0
Li + cable < ( A barrier)
Zener Barrier Wiring Diagram
Zener Barrier*
+
Note
DC
Power
Supply
Source voltage not greater than
250 VAC. Zener barriers must be
installed in accordance with barrier
manufacturer's instructions.
Red
_
GND
Earth Ground
Black
Green
Non-Conductive
Liquid Output
Zener Barrier**
White
Earth
Ground
*Use OMEGA P/N SBG111954
for CSA approval.
Conductive
Liquid Output
**Use OMEGA P/N SBG111950
for CSA approval.
Earth Ground
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