Omega Products LVR20 Installation Manual
• Product must be maintained and installed in strict accordance with the National Electrical Codes, Omega Operator's manual,
and any applicable electrical code in the country in which the product is installed. Failure to observe this
warning could result in serious injuries or damages.
Important Points!
Continuous Level Transmitters
LVR20 Analog Output (Proportional Voltage)
LVR30 Signal Conditioned Output (4-20mA, 0-5 VDC, 0-12 VDC)
• For hazardous area applications involving such things as (but not limited to) ignitable mixtures, combustible dust and flammable
materials, use an appropriate intrinsically safe interface device.
• The pressure and temperature limitations shown on the individual catalog pages and drawings for the specified level sensors
must not be exceeded. These pressures and temperatures take into consideration possible system surge pressures/
temperatures and their frequencies.
• Selection of materials for compatibility with the media is critical to the life and operation of Omega level sensors. Take care
in the proper selection of materials of construction, particularly wetted materials.
• Electrical entries and mounting points in an enclosed tank may require liquid/vapor sealing.
• Physical damage sustained by the product may render it unserviceable.
Servicing USA and Canada: Call OMEGA Toll Free
OMEGA Engineering. Inc.
One Omega Drive, Box 4047
Stamford, CT 06907-0047 U.S.A.
Headquarters: (203) 359-1660
Sales: 1-800-826-6342 / 1-800- TC-OMEGA
Customer Service: 1-800-622-2378/ 1-800-622-BEST
Engineering: 1-800-872-9436 / 1-800-USA-WHEN
FAX: (203) 359-7700 TELEX: 996404 EASYLINK: 62968934 CABLE: OMEGA
Servicing Europe: United Kingdom Sales and Distribution Center
OMEGA Technologies Ltd.
P.o. Box 1, Broughton Astley, Leicestershire LE9 6XR, England
Telephone: (0455) 285520 FAX: (0455) 283912
M2021/0602
Operator's Manual
Designed for continuous liquid level sensing, Omega's transmitters are considered "components".
Operating Principle
The LVR20/30 series utilize reed switch/magnet technology.
Meter
(Optional)
Junction
Box
A magnet-equipped float rises or lowers with corresponding
liquid level. The magnetic field generated from the float
actuates a series of reed switches mounted within a sealed
hollow tube. The series of reed switches is combined with
Sealed
Hollow
Tube
resistors to form a voltage divider.
When a regulated DC voltact is applied to an LVR20, the
resulting voltage output is directly proportional to liquid level.
Float
An LVR30 is anLVR20 with a signal conditioned output, for
use in applications that require unregulated input voltage or
current output.
Installation / Mounting
Units operate normally in any attitude, from vertical to a 30° inclination, up or down.
WARRANTY
OMEGA warrants this unit to be free of defects in materials and workmanship and to give satisfactory service for a period of 13 months from date of purchase. OMEGA 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 our customers receive maximum coverage on each product. If the unit
should malfunction, it must be returned to the factory for evaluation. Our 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. However, this WARRANTY is VOID if the unit shows evidence of having been tampered
with or shows evidence of being 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 which wear or which are damaged by misuse are not warranted. These include contact points, fuses, and triacs.
We are glad to offer suggestions on the use of our various products. Nevertheless OMEGA only warrants that the parts manufactured by it 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 buyer set forth her ein 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.
Every precaution for accuracy has been taken in the preparation of this manual, however, OMEGA ENGINEERING, INC. neither assumes responsibility for any omissions or errors that may appear
nor
assumes liability for any damages that result from the use of the products in accordance with the information con taine d in the manual.
RETURN REQUESTS /INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA ENGINEERING Customer Service Department. Call toll free in the USA and Canada: 1-800-622-2378, FAX: 203-359-7811;
International:203-359-1660,FAX: 203-359-7807.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, YOU MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OUR CUST OMER 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. Please have the following information available BEFORE contacting OMEGA:
1. P.O. number under which the product was PURCHASED,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems you are having with the product.
OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. That way our customers get the latest in technology and engineering. OMEGA is a registered trademark of OMEGA
ENGINEERING, INC.
© Copyright 1992 OMEGA ENGINEERING, INC. All rights reserved Including illustrations. Nothing in this manual may be reproduced in any manner, either wholly or in part for any purpose whatsoever without written
permission from OMEGA ENGINEERING, INC. Printed in U.S.A.
P/N 160999
Rev. A
Thread Treatment
Sealing: When threading metal threads into a metal coupling , pipe sealant or Teflon tape is
recommended. Due to potential compatibility problems, when sealing plastic threaded units, a
compatible pipe sealant is recommended.
Tightening: When threading a metal sensor into a metal coupling, the installer should use a
suitable wrench and tighten the threads 1-1/2 turns past hand-tight.
Specifications
Wetted Parts
Liquid Temperature
Ambient Operating Temperature
LVR20
LVR30
LVR30 Output Temperature Coefficient
Storage Temperature
LVR20
LVR30
Maximum Operating Pressure
Stem, Mounting and Float: 316 SS /Float Stop: 18-8 SS
-40° to 230°F (-40° to 110°C)
-40° to 230°F (-40° to 110°C)
5° to 160°F (-15° to 71.1°C)
+ 0.0062% FS/F°
-40° to 230°F (-40° to 110°C)
-40° to 212°F (-40° to 100°C)
300 PSIG
Operating Voltage:
LVR20: 5 to 30 Vdc;
LVR30: 12 to 40 Vdc
LVR30 Loop Impedance:
(Volts in - 12) x 53.8 = ohms with 24 Vdc
power, max loop impedance is 640 Ω
Connections:
LVR20: 3-wire;
LVR30: 2-wire
Dimensions of LVR20 Transmitter Dimensions of LVR30 Transmitter
#22 AWG TEFLON WIRES
24" - 26" EXTENDED
1/2" NPT
"B"
1/4"
+1/16"
+1/16"
"A"
TRAVEL
STEM LENGTH
1/8" REF
+1/4"
FLOAT
2 3/4"
1 9/16"
REF
1 1/4" NPT
2" NPT
HIGHEST LEVEL INDICATED
INCHES OF INDICATION
2" DIA
1 9/16" REF
1/2" DIA REF
Note: For hazardous area applications, use an appropriate intrinsically safe interface device.
LVR20 Wiring Diagram
Analog Output (Proportional Voltage)
LOWEST LEVEL INDICATED
Wiring Diagrams
Accuracy (at fixed temperature and voltage):
LVR20: + 1/2"
LVR30: 1.0% of full scale or + 1/2",
whichever is greater
Minimum Fluid Specific Gravity: 0.75 S.G.
Dimensions:
A: Float travel = indicating length + 3/8"
B: Overall Length = indicating length + 3 7/16"
J/BOX (COVER REMOVED)
1/2" NPT
"B"
+1/16"
+1/16"
1/4"
"A"
STEM LENGTH
1/8" REF
+1/4"
FLOAT
TRAVEL
2 3/4"
1 9/16"
REF
1 1/4" NPT
2" NPT
HIGHEST LEVEL INDICATED
INCHES OF INDICATION
2" DIA
1 9/16" REF
1/2" DIA REF
LOWEST LEVEL INDICATED
LVR30 Wiring Diagram
(4-20mA Output)
Calibration
The signal conditioner on yourLVR30 has been Factoryset. You do not need to calibrate.
Steps:
Calibration should be performed with the probe
A.
disconnected from the signal conditioner. Turn
off power to loop. Disconnect the red, black and
white wires from terminals 1, 2, and 3.
Adjust both the null and span potentiometers at
B.
approximately mid-range. (Figure 1)
Wire as shown per Figure 2, connecting a jumper
C.
wire in place of the black and white probe wires.
Connect an ammeter in series to monitor loop
current. Apply power to loop. Adjust null pot for
4mA.
Remove power from loop. Reposition the jumper
D.
wire in place of red and white probe wires.
Reapply power and with the span pot, set the
output current to 20mA.
Repeat Steps C and D for final adjustment.
E.
If power is maintained during jumper connections,
F.
current level may increase to 36mA. This is
normal. Current will return to regular readings
when connections are made.
Troubleshooting
Verify proper wiring, power supply, and loop resistance. If
transmitter is not functioning properly, isolate the transmitter
from the system and wire per Figure 3. Meter should read
4mA with float at bottom and 20mA with float on top of
transmitter. If unit is still not operating properly, please
consult Factory for further troubleshooting details.
Figure 1
Span
Potentiometer
Null
Potentiometer
Figure 2
Using 300 Ohm Resistor
Red
White
Black
Brown
Wht/Blk
Orange
1
3
2
5
6
4
R
Loop
Figure 3
4.12
AMMETER
+24V
Return
COM
Choose loop resistance (RL)
to match application
Customer Wiring
(See Wiring Diagram)
1/2" Trade Size
Ground Terminal
+V (Typically 24V)
Ammeter
_
+
mA
(both Ports)
Place Jumper
Here for 20 mA
Output
Place Jumper
Here for 4 mA
Output
Power Supply
(24 VDC)
+
_
Red
Black
White
Input: 10 - 30 VDC
Output: Proportional
Voltage
4-20 mA Tank Level Transmitter
1
3
2
4
5
6
Red
Wht
Blk
Junction
Box
Process
Control
Loop
Transmitter
+VA
Voltage
Source
or
Simulator
R
L
Excitation Required for Transmitters
Using 4-20 mA Signal Conditioners
The minimum excitation required for operation of
transmitters with 4-20 mA, DC signal converters
(See Chart) can be determined for a given total loop
resistance from the graph shown. (Total loop resistance = the sum of the DC termination resistance plus
loop resistance.) For optimum operation, which is a
function of source voltage (+VA) and total loop resistance, the source voltage value used should be above
the minimum load line for the related loop resistance.
Minimum Excitation Required For Loop Resistance
40
30
20
10
DC Source Voltage
0
0 200 400 600 800 1000 1200
RL (Ohms) Termination Plus DC Loop Resistance
Area
of Operation
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