Omega Engineering LVUN-600 User manual

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LVUN-600
Non-invasive Ultrasonic Point Level Switches
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User’s Guide
SE-60X-Series-new! 2/25/02 10:19 AM Page 1

Servicing North America:
U.S.A.: One Omega Drive, P.O. Box 4047
ISO 9001 Certified Stamford, CT 06907-0047
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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA 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, human applications.

UNPACKING INSTRUCTIONS
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For Ultrasonic Point Level Switches LVUN-600 Series
UNPACKING INSTRUCTIONS
Remove the Packing List and verify that you have received all equipment, includ-
ing the following (quantities in parentheses):
Ultrasonic 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-
ping is necessary.

TABLE OF CONTENTS
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For Ultrasonic Point Level Switches LVUN-600Series
Page
Chapter 1 Point Level Model Description . . . . . . . . . . . . . . . . . . . . . . . . . .4
Chapter 2 Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Chapter 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Chapter 4 System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9
Chapter 5 Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11

SYSTEM DESCRIPTIONS
4
PRINCIPLES OF OPERATION
The LVUN-600 Series operates using ultrasonic sound wave propagation. Ultrasonic
sound waves are greatly attenuated when transmitted through air. Conversely,
when liquid is present, transmission of the sound waves is greatly enhanced. The
electronic control unit, either integral or remote to the sensor, generates electrical
signals that are converted to bursts of ultrasonic energy at the sensor. The ultra-
sonic bursts are transmitted across the liquid sensing gap of the sensor. Upon
receipt of a valid signal at the receiver, the solid state electronics generate a “data
enable” condition indicating liquid is present. This signal energizes a relay and
provides an output condition.
PRINCIPLES OF OPERATION 2
GENERAL DESCRIPTION
The LVUN-600 Series Liquid Level Detection system is an ideal, low cost ultrasonic
liquid level detection system for many applications. It operates in a broad spec-
trum of viscous to light liquids.
For Ultrasonic Point Level Switches LVUN-600 Series
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INSTALLATION
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For Ultrasonic Point Level Switches LVUN-600Series
GENERAL INSTALLATION
All units are easy to install. The sensor with its remote electronic control unit can
be mounted in any position or orientation desired.
Make sure that all wiring, conduit and electrical fittings conform to local electrical
codes for the location selected.
VISUAL INSPECTION
Unpack the control unit and sensor assemblies. Visually inspect them for any
damage. Advise Cosense immediately if either assembly is damaged.
PRELIMINARY OPERATIONAL CHECK
Before installing the unit, a simple operational checkout should be performed as
follows:
WARNING: In a hazardous environment never open the housing cover or con-
nect the power leads without first disconnecting the electrical power at its
source.
1. Fill a container with liquid.
2. Open the control unit housing cover and connect the power to the control unit
(see wiring diagram).
3. Apply power from the source.
4. Place the sensor in the liquid. The relay should energize.
5. Remove the sensor from the liquid. The relay will de-energize indicating that
the system is functioning properly.
6. Disconnect the power to the control unit.
7. Proceed to final installation.
NON-INVASIVE / CLAMP-ON TIME
Refer to the typical installation diagram and follow the instructions below.
1. Clean the mounting surface of the pipe or vessel.
2. Coat the sensor faces and the area on the pipe or vessel where sensors are to
be mounted liberally with coupling compound (silicone grease or heat sink
compound).
3. Clamp the sensor assembly on the pipe or vessel. Tighten the clamp assembly
on the vessel until the sensor assembly is firmly mounted against the sensor
wall. Do not over tighten.
4. Run the cable to the control unit assembly.
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INSTALLATION
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For Ultrasonic Point Level Switches LVUN-600 Series
CONTROL UNIT
Refer to the typical installation diagram and control unit dimensions when
installing the control unit.
CALIBRATION PROCEDURE
After the installation is complete, the system must be calibrated for proper opera-
tion.
1. Connect the sensor cable to electronics as shown in wiring diagram.
2. Connect power as per wiring diagram.
3. Turn the power on.
4. Allow the liquid to rise above the sensing point until the relay is energized.
5. Allow the liquid to fall below the sensing point, relay should de-energized.
6. Repeat steps 4 and 5.
7. Unit is now calibrated. When the liquid level is above the sensing point, the
relay will be energized. When the liquid level is below the sensing point,
the relay will be de-energized.
MAINTENANCE
PREVENTIVE MAINTENANCE
Electronics are constructed with solid state components.
Periodically, check and clean the sensor(s) when used with
liquids which cause a coating to build up on the sensor. No
other maintenance is required.
CLEANING
If the pipe or vessel to which the sensor is mounted is to be steam cleaned or
cleaned with abrasive detergents, remove the entire unit before cleaning by:
1. Disconnecting the power at source.
2. Opening the housing cover.
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INSTALLATION
7
SYSTEM MALFUNCTION
Should the system malfunction, notify OMEGA immediately
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For Ultrasonic Point Level Switches LVUN-600 Series
3. Removing power and control wiring cables.
4. Unthreading the sensor.
To reinstall, follow Installation Procedure

SYSTEM WIRING DIAGRAM
8
WIRING DIAGRAM
Two Channel
For Ultrasonic Point Level Switches LVUN-600 Series
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SYSTEM WIRING DIAGRAM
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For Ultrasonic Point Level Switches LVUN-600 Series
4
WIRING DIAGRAM
Multi Channel:
Four Channel:
Three Channel: