Omega Engineering ULTRASONIC LEVEL TRANSMITTER LVU-90 - Manual (Page 3)

Step Two Step Three
SAFETY PRECAUTIONS WIRING
About this Manual:
PLEASE READ THE ENTIRE MANUAL PRIOR TO
INSTALLING OR USING THIS PRODUCT. This manual
includes information on the LVU-90 series continuous non-contact
level transmitter from OMEGA. Please refer to the part number
located on the sensor label to verify the exact model which you
have purchased.
User’s Responsibility for Safety:
OMEGA manufactures a wide range of liquid level sensors and
technologies. While each of these sensors is designed to operate in
a wide variety of applications, it is the user’s responsibility to select
a sensor model that is appropriate for the application, install it
properly, perform tests of the installed system, and maintain all
components. The failure to do so could result in property damage
or serious injury.
Proper Installation and Handling:
Because this is an electrically operated device, only properly-
trained staff should install and/or repair this product. Use a proper
sealant with all installations. Note: Always install the 3/4” Viton
gasket with the LVU-92. The G threaded version will not seal
unless the gasket is installed properly. Never overtighten the trans-
mitter within the fitting. Always check for leaks prior to system
start-up.
Wiring and Electrical:
A supply voltage of 12-36 VDC is used to power the transmitter.
The sensor systems should never exceed a maximum of 36 volts
DC. Electrical wiring of the sensor should be performed in accor-
dance with all applicable national, state, and local codes.
Material Compatibility:
The enclosure is made of Polypropylene (PP). The transducer is
made of Polyvinylidene Fluoride (PVDF). Make sure that the
model which you have selected is chemically compatible with the
application liquids it will contact.
Enclosure:
While the transmitter housing is liquid-resistant when installed
properly, it is not designed to be immersed. It should be mounted
in such a way that the enclosure and diaphragm do not come into
contact with fluid.
Make a Fail-Safe System:
Design a fail-safe system that accommodates the possibility of
transmitter or power failure. In critical applications, OMEGA rec-
ommends the use of redundant backup systems and alarms in addi-
tion to the primary system.
Flammable, Explosive and Hazardous Applications:
The LVU-90 series transmitter systems should not be used within
flammable or explosive applications.
Wiring to Terminal:
The LVU-90 arrives from the factory pre-calibrated and pre-assem-
bled. Use the following instructions below for wiring to the LVU-90.
1. First, remove the cap of the transmitter:
2. Look for the terminal block with two terminals.
3. Remove the terminal block to wire the LVU-90. The terminal to
the right is positive and the terminal to the left is negative.
4. When finished attaching the wires, assemble the LVU-90 using
steps 1 - 3 in reverse.
Warning
Always install the 3/4" Viton gasket with the LVU-92. The LVU-
92 G threaded version will not seal unless the gasket is installed
properly.
POWER
4-20 mA
(-) (+)
GND 12-36 VDC