Where Do I Find Everything I Need for
Process Mea surem ent a nd Control?
OMEGA…Of Course!
Use r ’s Gu id e
TEMPERATURE
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ߜ Thermocouple, RTD & Thermistor Probes,
Connectors, Panels & Assemblies
Wire: Thermocouple, RTD & Thermistor
Calibrators & Ice Point References
Recorders, Controllers & Process Monitors
Infrared Pyrometers
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®
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Air Velocity Indicators
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http://www.omega.com
e-mail: info@omega.com
Totalizers & Batch Controllers
p H/ CO NDUCTIVITY
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Benchtop/ Laboratory Meters
Controllers, Calibrators, Simulators & Pumps
Industrial pH & Conductivity Equipment
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Plug-in Cards for Apple, IBM & Compatibles
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Refractometers
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LVU-90 Series
Ultra sonic Level Tra nsm itter
M-3444 / 0799
T h e s e p r o d u W c t A s R a N r e I N n G o t : d e s i g n e d f o r u s e i n , a n d s h o u l d n o t b e u s e d f o r , p a t i e n t c o n n e c t e d a p p l i c a t i o n s .
t a i n s , a n d r e s e r v e s t h e r i g h t t o a l t e r s p e c i f i c a t i o n s w i t h o u t n o t i c e .
r r o r s i t c o n -
T h e i n f o r m a t i o n c o n t a i n e d i n t h i s d o c u m e n t i s b e l i e v e d t o b e c o r r e c t b u t O M E G A E n g i n e e r i n g , I n c . a c c e p t s n o l i a b i l i t y f o r a n y
e
p r i o r w r i w t t i e t n h o c p u o a t n r i n t s , e n t o f O M E G A E N G I N E E R
r e p r o d u c e d , t r p a h n o s t l a o t c e o d p , i e o d r , r e d u c e d t o a n y
a p p r o p r i a t e d e v i c e u p o n c e r t i f i c a t i o n .
p u r s u i n g c e r t i f i c a t i o n o f i t s p r o d u c t s t o t h e E u r o p e a n N e w A p p r o a c h D i r e c t i v e s . O M E G A w i l l a d d t h e C E m a r k t o e v e r y
I t i s t h e p o l i c y o f O M E G A t o c o m p l y w i t h a l l w o r l d w i d e s a f e t y a n d E M C / E M I r e g u l a t i o n s t h a t a p p l y
©
C o p y r i g h t 1 9 9 6 O M E G
. O M E G A i s c o n s t a n t l y
O M E G A i s r e g i s t e r e d t r a d
a
T h i s a f f o r d s o u r c u s t o m e r s
O M E G A ’ s p o l i c y i s t o m a
e - m a i l : u k @ o m e g a . c o m
e e i n o E T l n l g F l r a n d : 0 8 0 0 - 4 8 8 - 4 8 8
p r o b l e m s r e l a t i v e t o t h e p r o d u c t .
R e 3 p . a i r i n s t r u c t i o n s a n d / o r s p e c i f i c
p r o b l e m s r e l a t i v e t o t h e
R e 3 p . a i r i n s t r u c t i o n s a n d / o
u n d e r w a r r a n t y
M o 2 d . e l a n d s e r i a l n u m b e
w a s P U R C H A S E D ,
. O P . 1 n . u m b e r u n d e r w h i c h
c o n t a c t i n g O M E G A :
t h e f o l l o w i n g i n f o r m a t
A F X : 4 4 ( 1 6 1 ) 7 7 7 - 6 6 2 2
A F X : 4 4 ( 1 4 5 5 ) 2 8 3 9 1 2
e l T : 4 4 ( 1 4 5 5 ) 2 8 5 5 2 0
L E 9 6 T U , E n g l a n d
1
e l T : 4 4 ( 1 6 1 ) 7 7 7 - 6 6 1
M 4 4 5 E X , E n g l a n d
I r l a m , M a n e , c h e s t e r
M o 2 d . e l a n d s e r i a l n u m b e r o f p r o d u c t , a n d
, a n d
,
o f t h e r e p a i r
. O P . n 1 u . m b e r t o c o v e r t h e C O S T
,
, L e i c e A s t s e t r l s e h y i r o u B g r h t o n
t i f i e d
I S O 9 0 0 2 C e r
, O m e g a D . O P r i . v B e o , x 7
2 5 S w a n n i n g t o n R o a d , U n i t e d K i n g d o m :
B E F O R E c o n t a c t i n g O M E G A :
e - m a i l : g e r m a n y @ o m e g a . c o m
e e i n o G T l e l r F m r a n y : 0 1 3 0 1
t h e f o l l o w i n g i n f o r m a t i o n a v a i l a b l e
O M E G A f o r c u r r e n t r e p a i r c h a r g e s . H a v e
2 1 1 6 6
A F X : 4 9 ( 0 7 0 5 6 ) 8 5 4 0
o n n , G e r m a n y
c o n s u l A t I R S R , E P
A R R A N N T Y O N F - W O R
e l T : 4 9 ( 0 7 0 5 6 ) 3 0 1 7
D a i m l e r s t r a s s e 2 6 , D - 7 5 3 G 9 2 e D r m e c a k n e n y p / f A r u s t r i a :
R E T U R N S , p A l e R W a R s e A h N F a O T v Y R e
t o p r e v e n t b r e a k a g e i n
T h e p u r c h a s e r i s r e s p
e - m a i l : f r a n c e @ o m e g a . c o m
e e i n o F T l r l a F n r c e : 0 8 0 0 - 4 - 0 6 3 4 2
e l T : ( 3 3 ) 1 3 0 - 6 2 1 - 4 0 0
s h o u l d t h e n b e m a r k e
Y S ) . T h e a s s i g n e d A R n u m V O b I e D r P R O C E S S I N G D E L A T M A E R N T D E ( I P N O R D E R T O
’ S C U S T O M E R S E R
A
A F X : ( 3 3 ) 1 3 0 - 6 9 9 - 1 2 0
r a p p e s
V I C E
A I N O A B N T A U T H O R I Z E D R E T
u e D 9 , e r n i s P a p i n , 7 8 1 9 0 T F r a n c e :
D e p a r t m e n t . B E F O R E
D i r e c t a l l w a r r a n t y
e - m a i l : c z e c h @ o m e g a . c o m
( 6 2 9 ) 6 3 e 1 l T : 4
4 1 1 1
( 6 2 9 ) 6 3 1 A F X : 4
1 8 9 9
I N / Q U I R I E S
R E T U R N R E Q U E S T S
O s t r a v s k a 7 6 7 , 7 3 3 0 1 K a C r v z i e n c a h R e p u b l i c :
.
s u c h a m a n n e r
e - m a i l : n l @ o m e g a . c o m
e e i n o B T l e l n F e r l u x : 0 6 0 9 9 3 3 4 4
e l T : ( 3 1 ) 2 0 6 4 1 8 4 0 5
h a r m l e s s O f r M o m E G h a o A n l d y l i a b i l i t y o r
D / I S C L A I M E A R R l a R n A g N u T a Y g e , a n i d n a o d u d r i t b i o a s n i a c l l W y
m e d i c a l a p p l i c a
d n a
O M E G A
, p u r c h a s e r w i l l i n d e m n i f y
a s s u m e s O n , M o E r e G s A p o n s i b i l i t y a s s e t f o r t h
A F X : ( 3 1 ) 2 0 6 4 3 4 6 4 3
A m s t e l v 1 e 8 e 0 n L , A T h e N e t h e P r o l a s n t b d u s s 8 0 3 4 , 1
B e n e l u x :
,
a p p l i c a t i o n s o r u
C o m p o n e n t ” u n
o p e :
v i c i S n e g r E u r
n o s i t i n t e n d e O d M t o E b G e A u s e d , n o r s h a l l i t b e u s e d : C ( 1 O ) N a s D I a T I “ O B N a S s i : c
e - m a i l : e s p a n o l @ o m e g a . c o m
o ˜ l : ( 2 0 3 ) 3 E 5 n 9 - 1 E 6 s 6 p 0 a n e x t : 2 2 0 3
c i a l d a m a g e s .
u p o n w h i c h l i a
i n d e m n i f i c a t i o n
A F X : ( 9 5 ) 2 0 3 - 3 5 9 - 7 8 0 7
e l T : ( 9 5 ) 8 0 0 - T C - O M E G A L a t i n A m e r i c a :
S M
M e x i c o a n d
T E L E X : 9 9 6 4 0 4 E A S Y L I N K : 6 2 9 6 8 9 3 4 C A B L E : O M E G A
E n g i n e e r i n g S e r v i c e : 1 - 8 0 0 - 8 7 2 - 9 4 3 6 / 1 - 8 0 0 - U S A - W H E N
C u s t o m e r S e r v i c e : 1 - 8 0 0 - 6 2 2 - 2 3 7 8 / 1 - 8 0 0 - 6 2 2 - B E S T
S a l e s S e r v i c e : 1 - 8 0 a 0 n - 8 d 2 6 C - 6 U a 3 S 4 n 2 A a / d a 1 - : 8 0 0 - T C - O M E G A
, n e g l i g e n c e ,
T S 0 E V E R ,
, w h e t h e r b a s e d o n c o n t r a c t , w a r r a n t y
t o t a l l i a b i l i t y o
: T h e r e m e d i e s o f p T u I A r O c N h a O s e F r L s I A e t B f I o L r I T t h Y C h L e A r I e M i n E a D r . e L e I M x c I
S M
T I R C A U L A R P U R P O S E A R E H E R E B Y D A I B S I - L I T Y A N D F I T N E S S F O R A R W A R P A N T Y O F M E
S M
A R R A N T I E S I N C L U D I N G A N Y T O F T I T L E , A N D A L L I M P L I E D W
E X P R E S S E D O
S M
T I A O N S O F A N Y K I N D W H A A R R A N T I E S O R R E P R E S E N T O M E G A M A K E
F o r i m m e d i a t e t e c h n i c a l o r a p p l i c a t i o n a s s i s t a n c e :
t e n . O M E G A w
f r o m t h e u s e o f
a s s u m e s r e s p o
O M E G A i s p l e a
e - m a i l : c a n a d a @ o m e g a . c o m
A F X : ( 5 1 4 ) 8 5 6 - 6 8 8 6
5 A 1
e l T : ( 5 1 4 ) 8 5 6 - 6 9 2 8
L a v a l ( Q u e b e c ) H 7 L
9 7 6 B e r
, O M E G A n e i t h e r
c o s n ’ t r o l . O M E G A
C o m p o n e n t s w h
i m p r o p e r s p e c i f
s h o w s e v i d e n c e
g a r
C a n a d a :
e - m a i l : i n f o @ o m e g a . c o m
e l T : ( 2 0 3 ) 3 5 9 - 1 6 6 0
d , C T 0 6 S 9 t 0 a 7 m - 0 f o 0 4 r 7 t i f i e d
A R R A N T Y i s V O I D i f t h e u r n i z i t e d s h m o w o d s i f e i c v a i d t i e
l i m i t e d t o m i s h a
A R W R s ’ A N T Y d o O e M s E n G o t A a p p l y t o
t h f e i u n i t i s f O o u M n E d G t A o , b e d e f e e c x t i a v m e i i n t a w t i i o l l n b b e y
D e p a r t m e n t w i l l
A F X : ( 2 0 3 ) 3 5 9 - 7 7 0 0
, o r u n a u t h o -
, i n c l u d i n g b u t n o t
I S O 9 0 0 1 C e r
O n e O m e g a D r i v e , B o x 4 U 0 4 S 7 A :
t h A m e r i c a v : i c i S n e g r N o r
C u s ’ s t o m e r O S e M r v E i G c e A
I f t h e u n i t s h o u l
c s ’ u s t o m e r s r e c t h e a i v t e O m M a E x G i m A u m
t o c o v e r h a n d l i n g a n d s h i p p i n g t i m o e n . e T h ( 1 i s ) e y n e s a u r r e p s r o d u c p t e w r i o a d r r t a o n t t h y e n o
a r r a n t y a d d O s M a E n G a A d d W i t i o n a l o n e ( 1 ) f r m o m o n d t h a t g e r o a c f 1 e p 3 u r m c h o a n s e t . h p s e r i o d o f
O M E G A E N G I N
. o m e g a . c o m h t t p : / / w w w i n f o @ o m e g a . c o m
I n t e r n e t e - m a i l
O n - L i n e S e r v i O c e M E G A n e t
S M
O M E G A
®
D / I S C L A I M E A R R W R A N T Y
S A U
o m e g a . c o m
T M
I N
M
SAFETY PRECAUTIONS
WIRING
Step Two
Step Three
About this Manual:
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.
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.
1. First, remove the cap of the transmitter:
2. Look for the terminal block with two terminals.
User’s Responsibility for Safety:
POWER
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.
(-) (+)
4-20 mA
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.
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.
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.
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.
WIRING
INSTALLATION
Step Four
Step Five
Follow the instructions in Step 3 for wiring to the LVU-90.
The LVCN-90 transmitter may be installed through the top wall of a
tank. Installation requires a 3/4" NPT fitting or blind flange.
1. Wiring to an OMEGA Continuous Controller (LVCN-51):
Connect the (+) terminal to the positive 24 VDC, 25 mA terminal
on the controller. Connect the (-) terminal to the GND terminal on
the continuous controller (See illustration below). Check LVCN-
51 instruction manual for setting the LVCN-51 for loop powered
operation.
1. Install the appropriate 3/4" fitting in the top wall of the tank. Prior
to installation, make sure that the fitting has been installed prop-
erly and checked for leaks. Use a proper sealant at the time of
installation to ensure a liquid-tight seal. Secondly, make sure that
the fitting’s threads are not damaged or worn.
2. Insert the Transmitter into the fitting and tighten to hand tight.
POWER
3. Always check for leaks prior to system start-up. To ensure proper
installation, a complete leak test and simulation of actual process
conditions should be preformed.
RELAY
ON OFF INVERT
1
RELAY
INVERT
2
LATCH
P
W
R
DELAY
DELAY
(-) (+)
4-20 mA
Flange
Installation
Fitting
Installation
EASY CAL
4
20
OP
- +
UP
DOWN SET
0% INPUT 100%
2. Wiring to a Two-Wire Loop Powered Indicator:
The LVCN-90 requires 12-36 VDC power and an indicator which
receives a 4-20 mA current input. Connect the (+) terminal of the
LVCN-90 transmitter to the positive VDC terminal on the power
supply. Connect the (-) terminal on the LVCN-90 to the (+) ter-
minal on the loop indicator. Connect the (-) of the loop indicator
to the (-) of the power supply (See illustration below).
DC Power
POWER
Supply
12-36 VDC
(-) (+)
+
-
-
+
4-20 mA
- +
Warning
Do not install the LVCN-90 in pressurized applications above 30
psi.
Always install the 3/4" Viton gasket with the LVCN-92. The
LVCN-92 G threaded version will not seal unless the gasket is
installed properly.erly and checked for leaks.
3. Wiring to a Typical PLC:
The LVCN-90 requires a PLC which provides a 12-36 VDC exci-
tation and receives a 4-20 mA current input. Connect the (+) ter-
minal of the LVCN-90 transmitter to the positive VDC power ter-
minal. Connect the (-) terminal on the LVCN-90 to the (+) chan-
nel on the PLC. Connect the (-) of the PLC to the (-) of the power
terminal (See illustration below).
Use a proper sealant at the time of installation to ensure a liquid-
tight seal. Secondly, make sure that the fitting’s threads are not
damaged or worn.
Avoid
Interference from
side of tank
Do not
install at
an angle
6
DC Power
Supply
12-36 VDC
POWER
5
4
(-) (+)
3
+
-
2
1
0
A
4-20 mA
- +
Avoid
Interference from
obstructions in
tank
LVCN-90 will
not operate in
vacuum
* 250 Ω resistor typically internal to PLC
VACUUM
CALIBRATION
CALIBRATION
Step Six
Step Seven
The LVCN-90 is factory calibrated with a fixed measurement span of
6 feet. The 4 mA position is located 72" from the transducer face. The
20 mA position is located 3.6 inches from the transducer face. Refer
to the current to distance and distance to current conversion charts in
step seven for reading the current output.
Current to Distance Conversion Chart (Nominal)
Current Distance Current Distance Current Distance
mA
inches
mA
inches
mA
inches
20
19
18
17
16
15
03.6
07.9
12.1
16.4
20.7
25.0
14
13
12
11
10
09
29.2
33.5
37.8
42.1
46.3
50.6
08
07
06
05
04
54.9
59.2
63.5
67.7
72.0
1. Connect a multimeter in series to read the current output.
2. Verify that as the distance from the liquid to the LVCN-90
increases, the current signal decreases.
3. Verify that as the distance from the liquid to the LVCN-90
decreases, the current signal increases.
Distance to Current Conversion Chart (Nominal)
Power
Supply
Power
Supply
5
20
4
6
19
21
Distance Current Distance Current Distance Current
inches
mA
inches
mA
inches
mA
mA
(+)
mA
(+)
3.6
06
12
18
24
20.0
19.4
18.0
16.6
15.2
30
36
42
48
54
13.8
12.4
11.0
09.6
08.2
60
66
72
06.8
05.4
04.0
com
com
3.6"
20 mA
72"
3.6"
20 mA
4 mA
72"
LED Indication
68.4"
The LVCN-90 features a single LED indicator which is used for
power and fail-safe indication. During normal operation, the LED
will be ON continuously to indicate that the transmitter has power and
a strong echo signal return strength. Should the LED begin to
FLASH, it indicates that the transmitter has no signal return strength
and the device has gone into a fail-safe condition. During the fail-safe
condition, the current will increase up to 22 mA and hold until the
acoustic signal is reacquired. Once reacquired, the LED will turn back
ON continuously and the current will indicate the appropriate mea-
sured value.
4 mA
POWER
LED
(-) (+)
4-20 mA
MAINTENANCE
Step Eight
Step Nine
General:
The LVCN-90 series level transmitter itself requires no periodic
maintenance except cleaning as required. It is the responsibility of the
user to determine the appropriate maintenance schedule, based on the
specific characteristics of the application liquids.
Cleaning Procedure:
1. Power: Make Sure that all power to the transmitter, controller
and/or power supply is completely disconnected.
2. Sensor Removal: In all through-wall installations, make sure that
the tank is drained well below the sensor prior to removal.
Carefully, remove the sensor from the installation.
3. Cleaning the Sensor: Use a soft bristle brush and mild detergent,
carefully wash the transducer of the LVCN-90. Do not use harsh
abrasives such as steel wool or sandpaper, which might damage
the transmitter's surface. Do not use incompatible solvents which
may damage the PVDF transducer or the transmitter’s PP body.
4. Sensor Installation: Follow the appropriate steps of installation as
outlined in the installation section of this manual.
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