Omega Engineering LVU-230 User manual

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LVUC10
Ultrasonic Point Level Switches
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User’s Guide
LL-100 Series
LVU-260
X
LVU-230

Servicing North America:
U.S.A.: One Omega Drive, P.O. Box 4047
ISO 9001 Certified Stamford, CT 06907-0047
TEL: [phone] FAX: [phone]
e-mail: [email protected]
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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
2For Ultrasonic Point Level Switches
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
3
For Ultrasonic Point Level Switches
Page
Chapter 1 Point Level Model Description . . . . . . . . . . . . . . . . . . . . . . .4
Chapter 2 Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Chapter 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7
Chapter 4 System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . .8-10
Chapter 5 Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12
Chapter 6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

SYSTEM DESCRIPTIONS
4
GENERAL DESCRIPTION
This Series of Liquid Level Detection systems are ideal, low cost ultrasonic
liquid level detection systems for many applications. They operate in a broad
spectrum of viscous to light liquids.
It uses proven ultrasonic technology with a sensor fabricated completely from
316 Stainless Steel, which allows it to operate in virtually any liquid.
Sensitivity adjustment allows the monitoring of percentage solids in the contents
of the liquid. Its small size standard 3/4” NPT mounting fitting, and ability to be
installed vertically or horizontally makes it the perfect choice for new or existing
applications.
MODEL FUNCTION TYPE INPUT OUTPUT AGENCY
APPROVAL
LVU-230 Standard Point Integral 115VAC/230VAC 10A DPDT CE
Level Gap Sensor & Remote 24VDC/12VDC
LVU-260 Loop Power Point Integral 9VDC to 30VDC Two WireCE
Leve Gap Sensor 4-20mA
4-20mA
LVUC10 Cryogenic Temp Integral 115VAC/230VAC 10A DPDT CE
Liquid Level Sensor (-100˚C) 24VDC/12VDC Two Wire,
Remote 4-20mA
(-300˚C)
1
1
4

PRINCIPLES OF OPERATION
5
For Ultrasonic Point Level Switches
The Level switches 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\or
provides an output condition.
2
INSTALLATION
GENERAL
All units are easy to install. A sensor with an integral electronic control unit or a
sensor with a remote 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 appropriate wiring diagram for your unit).
3. Apply power from the source.
4. Place the sensor in the liquid. The relay should energize, or output will switch
to 20.0±1.0mA.
5. Remove the sensor from the liquid. The relay will de-energize or output will
switch back to 4.0±1.0mA indicating that the system is functioning properly.
If you do not experience the results indicated in Steps 4 and 5, contact
Cosense immediately.
6. Disconnect the power to the control unit.
7. Proceed to final installation.
3

FINAL INSTALLATION
6For Ultrasonic Point Level Switches
3
CONTACT MODELS
Follow the instructions below:
1. Drill a suitable hole in the vessel or pipe wall and tap for 3/4” NPT. If this
walled vessel or material is not suitable for threading, weld or braze a bush-
ing to accept the sensor.
2. Screw the sensor in the threaded section and make sure that there is a good
seal. Use a pipe compound or sealing tape compatible with the materials and
avoid excessive tightening.
3. Run the power and control wiring cable to the electronic control unit.
Observing all applicable electrical codes and proper wiring procedures.
CONTROL UNIT
Refer to the typical installation diagram and control unit dimensions when
installing the control unit. Follow steps 1 and 2 below for remote mounted elec-
tronic units. Steps 3 through 7 are common for both the integral electronic units
and remote electronic units.
1. Mount the remote control unit on any suitable wall, panel, etc. making sure
there is adequate clearance for wiring.
2. Remove the PC board by removing the screws. Drill a suitable size hole in the
control unit housing for a conduit fitting (if so required).
3. Remove the cover from housing. To complete wiring, either leave or remove
the electronics printed circuit board in the housing on remote units and
remove the encapsulate electronics in integral units.
CAUTION: Never remove unit from a vessel with power and/or output
control cables connected to the electronic control unit inside the housing
to avoid cable damage.
4. Wire the unit as desired. Refer to the wiring diagram inside the cover.
Note: All wiring, conduit and fittings should conform to local electrical
codes. In a hazardous location, a conduit seal should be installed within
18 inches of the control unit housing. Use a drain seal in vertical conduit
run to prevent condensation from entering the control unit. OMEGA
assumes no responsibility for improperly wired units.
5. Replace the printed circuit board, if removed, or the encapsulated electronics.
Make certain that the wires are dressed carefully to prevent pinching between
the cover and the housing.
6. Replace the housing cover.

FINAL INSTALLATION
7
For Ultrasonic Point Level Switches
3
CALIBRATION PROCEDURE
(IF REQUIRED, OTHERWISE DO NOT ADJUST THE POTENTIOMETER -
LVUC10)
After the installation is complete, the system must be calibrated for the proper
operation.
1. Connect the sensor cable to electronics at Jacks J1 and J2.
2. Connect power as per wiring diagram.
3. Turn the power on.
4. Allow the liquid or sludge to rise above the sensing point, adjust the poten-
tiometer clockwise, until the relay is energized or output will switch to
20.0+1.0 mA. Turn the potentiometer one more turn clockwise.
5. Allow the liquid or sludge to fall below the sensing point, relay should be de-
energized or output will switch back to 4.0+1.0 mA. If not, turn the poten-
tiometer counter clockwise until the relay is de-energized. Turn the poten-
tiometer counter clockwise one half turn.
6. Repeat Steps 4 and 5 for a final adjustment.
8. Unit is now calibrated. When the liquid level is above the sensing point, the
relay will be energized or output will switch to 20.0±1.0 mA. When the liq-
uid level is below the sensing point, the relay will be de-energized or output
will switch back to 4.0±1.0 mA.

SYSTEM WIRING DIAGRAM
8For Ultrasonic Point Level Switches
4

SYSTEM WIRING DIAGRAM
9
For Ultrasonic Point Level Switches
4

SYSTEM WIRING DIAGRAM
10For Ultrasonic Point Level Switches
4

DIMENSIONAL DRAWINGS
11
For Ultrasonic Point Level Switches
5

DIMENSIONAL DRAWINGS
12For Ultrasonic Point Level Switches
5

MAINTENANCE
13
For Ultrasonic Point Level Switches
6
PREVENTATIVE MAINTENANCE
Electronics are constructed with solid state components and are epoxy encapsu-
lated. Periodically check and clean the sensor when used with liquids which
cause a coating build up on the sensor. No other maintenance is required.
CLEANING
If the pipe or vessel to which the unit is mounted is to be steam cleaned or
cleaned with abrasive detergents, remove the entire unit before cleaning by:
1. Disconnecting the power at the source.
2. Opening the housing cover.
3. Removing the power and control wiring cable.
4. Unthreading the sensor.
To reinstall, follow the installation procedures.
SYSTEM MALFUNCTION
Should the system malfunction, notify Omega immediately.

WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.
RETURN REQUESTS/INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN
(AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return
package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
FOR WARRANTY RETURNS, please have the
following information available BEFORE
contacting OMEGA:
1. Purchase Order number under which the product
was PURCHASED,
2. Model and serial number of the product under
warranty, and
3. Repair instructions and/or specific problems
relative to the product.
FOR NON-WARRANTY REPAIRS, consult OMEGA
for current repair charges. Have the following
information available BEFORE contacting OMEGA:
1. Purchase Order number to cover the COST
of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems
relative to the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2005 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.

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