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User’s Guide
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LVP-51 Series
M-3949/0403
Non-Intrusive Capacitance Switch
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 , h u m a n a p p l i c a t i o n s .
a n d r e s e r v c e o s n t a h i e n s 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 .
w i t h o u t t h e p r i o
r e d o u r c e d t o a n y t r a e n l e s c l a t r t o e n d i , c m r e e p d r i o u d m u c c o o e r p d m i , e a d c , h i n e - r e a
© C o p y r i g h t 2 0
e r r o r s i t
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
a d d t h e C E m a r k t o e v e r 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 .
i s c o n s t a n t l y 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
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
O M E G A i s a r e
. O M E G A
T h i s a f f o r d s o u
p s ’ o l i c y i s O t o M m E G a k A e r u n n i
e - m a i l : s a l e s @ o m e g a . f r
e - m a i l : s a l e s @ o m e g a . c o . u k
0 8 0 0 - 4 8 8 - 4 8 8
e e i n o U T l n l F i t r e d K i n g d o m :
r e l a t i v e t o t h e p r o d
R e p 3 a . i r i n s t r u c t i o n s
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
w a s P U R C H A S E D ,
P u r 1 c . h a s e O r d e r n u
e e i n o F T l r l a F n r c e : 0 8 0 0 4 6 6 3 4 2
A X : + 3 3 ( 0 ) 1 3 0 5 7 5 4 2 7 l : e + T 3 3 ( 0 ) 1 6 1 3 7 2 9 0 0
7 8 2 8 0 G u y a n c o u r t , F r a n c e
e u J a c 1 q 1 , u r e s C a r t i e r
r e l a t i v e t o t h e p r o d u c t .
R e p 3 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
F
, a n d
M o 2 d . e l a n d s e r i a l n u m b e r o f t h e p r o d u c t , a n d
o f t h e r e p a i r
A F X : + 4 4 ( 0 ) 1 6 1 7 7 7 6 6 2 2
l : e + T 4 4 ( 0 ) 1 6 1 7 7 7 6 6 1
U n i t e d K i n g d o m
,
1
n u r m e d b r e O r t o c o v e r . P 1 t u h r c e h a C s O e S T
O M E G A :
F r a n c e :
O M E G A :
f o l l o w i n g i n f o r m
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 R Y e t h e
M a n c h e s t e r M 4 4 5 B D
N o r t h b a n k , I r l a m
e c h n o l o g y C e R n i t v r e r B e n d T
O n e O m e g a D r i v e
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 B E F O R E c o n t a c t i n g
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 t h e f o l -
e - m a i l : i n f o @ o m e g a s h o p . c z
e e : 0 8 o 0 T l 0 l - F 1 r - 6 6 3 4 2
4 2 + 0 : X ( 0 A ) F 5 9 6 3
4 2 + 0 : l ( e 0 T ) 5 9 6 3 1
c o n s u A l t I R S R , E P
A R R A N N T Y O N F - W O R
e
4
1 1 1 1
1 8 9 9
t o p r e v e n t b r e a k
T h e p u r c h a s e r i s r e s p o n a s n i b y l e c o f o r r r e s s h p i p o p n i d n
Y S ) . T D h E e L a A s s i g n e d A
t i f i e d
I S O 9 0 0 2 C e r
U n i t e d K i n g d o m :
, ´ C z e c h R e p u b l i c
F r y s t a t s k a 1 8 4 / 4 6 , 7 3 3 0 1 K a r v i n a
C z e c h R e p u b l i c :
V O I D P R O C E S S I N G
T M A E R N T ( I N V O I R C D E E D R E T P O
A I N A N A U T H O R I Z E D R E T U R N ( A R )
A
’ S C U S T O M E R S E R
N U M B E R F R O M
e - m a i l : i n f o @ o m e g a . d e
e e i n o G T l e l r F m r a n y : 0 8 0 0 6 3 9 7 6 7 8
A F X : + 4 9 ( 0 ) 7 0 5 6 9 3 9 8 - 2 9
l : e + T 4 9 ( 0 ) 7 0 5 6 9 3 9 8 - 0
o n n , G e r m D a n e y c k e n p f r
D a i m l e r s t r a s s e 2 6 , D - 7 5 3 9 2
A N Y P R O D U C R T E ( T S U ) R T N O I N O G M E G
e - m a i l : s a l e s @ o m e g a e n g . n l
e e i n o B T l e l n F e r l u x : 0 8 0 0 0 9 9 3 3 4 4
D i r e c t a l l w a r r a
I N / Q U I R I E S
R E T U R N R E Q U E S T S
A X : + 3 1 ( 0 ) 2 0 6 4 3 4 6 4 3 l : e + T 3 1 ( 0 ) 2 0 3 4 7 2 1 2 1
F
.
s u c h a m a n n e r
h o l d O M E G A h
T h e N e t h e r l a n d s
P o s t b u s 8 0 3 4 , 1
B e n e l u x :
A m s t e l v 1 e 8 e 0 n L A
, p u r c h a s e r w i l l i n d e m n i f y O M E G A a n d D / I S C L A I M E A R R l R a n A g N u T a Y g e , a n i n d , o a u d r d b i t a i o s n i c a l W l y
G e r m a n y / A u s t r i a :
, O M E G A a s s u m e s n o r e s p o n s i b i l i t y a s s e t f o r t h
m e d i c a l a p p l i c a
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
C O N D I T I O N S : E
n o e v e n t s h a l l
o t h e r w i s e , s h a
,
S e r v i c i n g E u r o p e :
C A B L E : O M E G A
i n f o @ o m e g a . c o m . m x
e - m a i l : e s p a n o l @ o m e g a . c o 1 m / - 8 0 0 - U S A - W H E N
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
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
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
S a l e s S e r v i c e : 1 - 8 0 0 - 8 2 6 - 6 3 4 2
®
, n e g l i g e n c e , i n d e m n i f i c a t i o n , s t r i c t l i a , b i w l i h t y e o t o r h d r e e r r b a s e d o
p u r c h a s e r s e t
A F X : ( 0 0 1 ) 2 0 3 - 3 5 9 - 7 8 0 7
1 / - 8 0 0 - 6 2 2 - B E S T
1 / - 8 0 0 - T C - O M E G A
®
: T h e r e m e d i e s o f T I A O N O F L I A B I L I T Y
I C T U R L A A P R P U R P O S E
A R W R A N T I E S I N
o l : ( 0 0 1 ) 2 E 0 n 3 - 3 E 5 s 9 p - a 7 n 8 0 3
®
~
A B I L I T Y A N D F I T N E S S F O A R R A R A N T Y O F M E R C H A N T
M e x i c o :
a n d C U a S n A a d a :
T O F T I T L E , A N D A L L I M P L I E D
A R R A N T I E S O R R E P R E S E N T
T S O E V E R , E X P R E S S O F O R A N I M Y P K L I N E D D ,
s p e c i f i e d a n d
F o r i m m e d i a t e t e c h n i c a I l O T o N A r S a p p l i c a t i o n a s s i s t a n c e :
e i t h e r v e r b a l
t h a t r e s u l t f r o
e - m a i l : i n f o @ o m e g a . c o m
A F X : ( 2 0 3 ) 3 5 9 - 7 7 0 0
e l T : ( 2 0 3 ) 3 5 9 - 1 6 6 0
e - m a i l : i n f o @ o m e g a . c a
A F X : ( 5 1 4 ) 8 5 6 - 6 8 8 6
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
n e i t h e r a s s u m
, O M E G A
O M E G A i s p l e
C o m p o n e n t s w h
t i o n ; i m p r o p e r s
s h o w s e v i d e n c e
c s ’ o n t r o l .
d C T 0 6 9 S 0 t a 7 m - 0 f 0 o 4 r 7
O n e O m e g a D r i v e , B o x 4 0 4 7
I S O 9 0 U 0 1 S A C : e r
5 A 1 , C a n a d a
A R R A N T Y i s V O I D i f t h e u r n i z i e t d s h m o w o d s i f e i c v a i d t i
l i m i t e d t o m i s h a
g a r
, o r u n a u t h o -
, i n c l u d i n g b u t n o t
t i f i e d
C a n a d a :
A R R W s ’ A N T Y d O o e M s E n G o A t a p p l y t o
e x a m i n a t i o n b y
t h A m e r i c a v : i c i S n e g r N o r
D e p a r t m e n t w i l
I f t h e u n i t m a l
s C ’ u s t o m e r S e r v i c e
i n f o @ o m e g a . c o m
. o m e g w a w . c o w m
O M E G A n e t
c s ’ u s t o m e r O s M r e E c G e i A v e m a x i 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 t s o r t o h t h d a e u t c n t o r w m a a r l r a
r r a a n t W y s ’ a d d s a n a d d i t i o n a l o n e ( 1 ) m o n f r t o h m g r d a a c t e e p o e f r 1 p i o 3 u d r m c h o o a n d s e t o h . f O s M E G A
O M E G A E N G I N
e - m a i l I n t e r n e t
e c i v r e S e n i L - n O ®
®
S A U
o
D / I S C L A I M E A R R W R A N T Y
®
I N
M A D
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SAFETY PRECAUTIONS
INTRODUCTION
Step Two
Step Three
About this Manual:
About Non-Intrusive RF Capacitance Technology:
OMEGA's LVP-51 series level switch generates a high radio frequen-
cy signal from the capacitance electrode on the tank side of each sen-
sor. Depending on the thickness of the tank wall and the material of
which it is made, there is a particular minimum dielectric value the
electrode measures when there is no liquid on the other side of the
tank wall from the sensor. When liquid is on the other side of the
wall, the dielectric value rises.
PLEASE READ THE ENTIRE MANUAL PRIOR TO
INSTALLING OR USING THIS PRODUCT. This manual
includes information on all models of the LVP-51 series Non-
Intrusive RF Capacitance level switch from Omega. Please refer to
the part number located on the switch label to verify the exact
model which you have purchased.
User’s Responsibility for Safety:
As part of installation, a two-step calibration procedure ensures that
the threshold between wet and dry is set at the ideal point for your
particular tank and application fluid, without the use of any external
test equipment. The sensor’s operation and point of actuation may
vary based on the dielectric properties of various application liquids,
tank materials and thicknesses. The LVP-51 series sensor is intended
to be used with liquids with a dielectric value between 20 and 80.
Due to its user calibration capability it may be able to detect liquids
below a dielectric constant of 20 under certain conditions, but this
must be verified by experimentation.
Omega manufactures a wide range of liquid level sensors and tech-
nologies. 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, per-
form 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. The adhesive
on the fitting is for temporary installation only. For permanent
installation, the fitting for the sensor should be welded, glassed or
strapped to the tank itself using approved plastic welding tech-
niques. Do not install the LVP-51 series sensor on a metal tank, or
within 6" of any metal pipe or fitting.
Mounting Bracket:
The LVP-51 series sensor may be mounted in the PE bracket (poly-
ethylene, colored white). Make sure that the fitting is compatible
with the tank it will be applied to.
Material Compatibility:
The sensor itself is not designed to be immersed. It should be
mounted in such a way that it does not normally come into contact
with fluid. Its case is made out of Polysulfone (PSO). Refer to an
industry reference to ensure that compounds that may splash onto
the controller housing will not damage it. Such damage is not cov-
ered by the warranty.
Wiring and Electrical:
The supply voltage used to power the LVP-51 series sensor should
never exceed a maximum of 36 volts DC. Electrical wiring of the
sensor should be performed in accordance with all applicable
national, state, and local codes.
Flammable, Explosive and Hazardous Applications:
The LVP-51 series switch is not rated for use in hazardous loca-
tions. Refer to the National Electric Code (NEC) for all applicable
installation requirements in hazardous locations. DO NOT USE
THE LVP-51 SERIES GENERAL PURPOSE SWITCH IN HAZ-
ARDOUS LOCATIONS.
WARNING
Do not install the LVP-51 series level switch on a metallic tank,
or within 6" of any metallic object. Metal will adversely affect
the dielectric sensitivity of the sensor.
OMEGA's LVP-51 series sensors are not recommended for use
with electrically charged application liquids. For most reliable
operation, the liquid being measured may need to be electrically
grounded.
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INSTALLATION
ELECTRICAL
Step Four
Step Five
OMEGA's LVP-51 series level switch may be installed anywhere on
a tank wall using the supplied PE fitting that the switch slides into.
The fitting comes with adhesive on the tank side that is sufficient to
hold the sensor in position temporarily while the installation is tested,
but for permanent installation the fitting must be welded, glassed or
strapped to the tank. Extra fittings are available from Omega, so that
the level switch may be moved to different locations on the tank by
sliding it into other fittings.
Supply Voltage:
The supply voltage to the LVP-51 series level switch should never
exceed a maximum of 36 VDC. Omega controllers have a built-in 13.5
VDC power supply which provides power to all of OMEGA's electri-
cally powered sensors. Alternative controllers and power supplies, with
a minimum output of 12 VDC up to a maximum output of 36 VDC,
may also be used with the LVP-51 series level switch.
Required Cable Length:
Attach the fitting to the tank:
Determine the length of cable required between the LVP-51 series
level switch and its point of termination. Allow enough slack to
ensure the easy installation, removal and/or maintenance of the sen-
sor. The cable length may be extended up to a maximum of 1000 feet,
using a well-insulated, 14 to 20 gauge shielded four conductor cable.
1. Determine the mounting location for the level switch. The point
of actuation (where the sensor will send a “wet” signal) is most
often at the center of the sensor;
however the actual Point of
Actuation (POA) may differ
Weld
depending on the application liq-
uid and tank wall characteristics.
After positioning the fitting to
check clearances, etc., remove the
paper protective strips from the
adhesive of the fitting.
Fitting
Wire Stripping:
Using a 10 gauge wire stripper, carefully remove the outer layer of
insulation from the last 1-1/4" of the sensor's cable. Unwrap and dis-
card the exposed foil shield from around the signal wires, leaving the
drain wire attached if desired. With a 20 gauge wire stripper, remove
the last 1/4" of the colored insulation from the signal wires.
Sensor
Screw
2. Press the fitting into place. The
adhesive provides a seal between
the sensor and the tank wall, and
will hold it in place during testing
and installation.
Signal Outputs (Current sensing):
1/2" NPT
Connector
The standard method used by Omega controllers; this technology uses
only two wires (Red and Black). The sensor draws 5 mA when it is dry,
and 19 mA when wet. NC/NO status must be set by the controller. The
Green and White wires are not used.
If desired, the sensor may be installed temporarily without weld-
ing the fitting to the wall. If several different locations must be
tried before permanent installation, use double-sided foam stick
tape designed for PE, for example Arclad type PE-6024,
CO#7331 (from Adhesive Research Inc., Glen Rock PA 17327) or
equivalent.
Red
+
24 VDC
Power Supply
-
-
Shield
Ground
Multimeter
(mA)
3. After the sensor has been tested to verify the POA, weld, glass or
strap the fitting to the tank using standard industrial plastic tech-
niques.
Black
+
Signal Outputs (Relay switching):
Allows the sensor to switch a small load on or off directly, using an
internal 1 A relay (60 VAC/60 VDC). All models, LVP-51 series-
_005, use the relay and features 4 wires (red, black, white and green)
and a shield wire. The NO/NC status is set by the polarity of the volt-
age feeding the Red and Black wires. The Green wire is the common
for the relay and the White is the NO or NC, depending on the polar-
ity of Red and Black.
Special note for small round tanks:
The fitting may be attached to small, round tanks, as long as the
majority of the fitting is firmly attached to the wall. However,
extreme installations may effect the switches performance.
Mount the sensor in the fitting:
1. Slide the sensor into the fitting.
2. After trimming the sensor wire to length if needed by the installa-
tion, thread the sensor wire into a plastic flexible conduit with a
1/2" male fitting. Screw the conduit into the sensor, being careful
not to cross the threads. Do not over tighten the conduit in the
sensor as this may break the fitting. Such damage is not covered
by the warranty. Take care while pulling the wire through conduit
that no excessive tension is placed on the sensor end of the wire,
so that the wire is not broken from the sensor housing.
Normally Open Wiring:
Red
+
24 VDC
Power Supply
Black
White
-
-
Shield
Ground
Multimeter
(Continuity)
Green
+
3. Connect the sensor wire to the controller following the instruc-
tions in its manual. See the following Wiring Section for detailed
wiring instructions.
Normally Open Wiring:
Black
+
-
24 VDC
Power Supply
Red
White
Green
Shield
Ground
-
Multimeter
(Continuity)
+
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WIRING
WIRING
Step Six
Step Seven
Wiring to a Omega Controller
LVCN-120/-130/-140 Series Controller:
Wiring the Relay Output:
The LVP-51 series relay output can be wired as a dry contact to a
VDC or VAC power source. LVP-51 series requires 12 - 36 VDC
power to operate the sensor and switch the relay. All illustrations
below identify a Dry switch state as the normal position of the relay.
P O W E R
I N V E RT
D E L AY
I N V E RT D E L AY
--
+
--
+
R E L AY
1
R E L AY
2
Switching a Normally Open DC Load:
The Red wire connects to Positive (+) of the power supply and the
Black wire connects to Negative (-). The LOAD can be attached to
either the Green or White wires. Complete the circuit by either con-
necting the Green to (+) VDC power or White to (-) VDC power (see
illustration below).
L AT C H
ON OFF
I N P U T
1
I N P U T 2 A
I N P U T 2 B
Red
Black
Shield
[Dry Condition]
[+]
RED
GRN
SHLD
WHT
BLK
White and Green - Not Used
LOAD
LOAD
Sensor
(NO)
OR
Wiring as a P-Channel or N-Channel output:
The LVP-51 series can be substituted for either a P-Channel (PNP,
sourcing) output or a N-Channel (NPN, sinking) output.
[-]
Normally Open DC Load as a P-Channel Output:
Switching a Normally Closed DC Load:
To wire as a NO P-Channel output, follow the directions below. The
Red wire connects to Positive (+) of the power supply and the Black
wire connects to Negative (-). The Green wire is jumpered to the Red
wire while the White wire is connected to the LOAD. Jumper the
LOAD back to the Negative (-) to complete the circuit.
The Black wire connects to Positive (+) of the power supply and the
Red wire connects to Negative (-). The LOAD can be attached to
either the Green or White wires. Complete the circuit by either con-
necting the Green to (+) VDC power or White to (-) VDC power (see
illustration below).
[Dry Condition]
[Dry Condition]
[+]
[-]
RED
GRN
SHLD
WHT
BLK
[+]
BLK
Sensor
(NO)
GRN
SHLD
WHT
RED
Sensor
(NC)
LOAD
LOAD
OR
LOAD
[-]
Normally Closed DC Load as a P-Channel Output:
Switching a Normally Open AC Load:
To wire as a NC P-Channel output, follow the directions below. The
Black wire connects to Positive (+) of the power supply and the Red
wire connects to Negative (-). The Green wire is jumpered to the
Black wire while the White wire is connected to the LOAD. Jumper
the LOAD back to the Negative (-) to complete the circuit.
The Red wire connects to Positive (+) of the DC power supply and the
Black wire connects to Negative (-). The LOAD can be attached to
the Green wire and the Hot of the VAC power. Connect the White to
the Neutral of the VAC power (see illustration below).
[Dry Condition]
Normally Open DC Load as a N-Channel Output:
[+]
[AC Power]
[-]
RED
GRN
SHLD
WHT
BLK
To wire as a NO N-Channel output, follow the directions below. The
Red wire connects to Positive (+) of the power supply and the Black
wire connects to Negative (-). The White wire is jumpered to the
Black wire while the Green wire is connected to the LOAD. Jumper
the LOAD back to the Positive (+) to complete the circuit.
LOAD
Sensor
(NO)
[Dry Condition]
Switching a Normally Closed AC Load:
The Black wire connects to Positive (+) of the DC power supply and
the Red wire connects to Negative (-). The LOAD can be attached to
the Green wire and the Hot of the VAC power. Connect the White to
the Neutral of the VAC power (see illustration below).
[+]
[-]
RED
GRN
SHLD
WHT
BLK
LOAD
Sensor
(NO)
[Dry Condition]
[+]
BLK
Normally Closed DC Load as a N-Channel Output:
GRN
SHLD
WHT
RED
LOAD
Sensor
(NC)
To wire as a NC N-Channel output, follow the directions below. The
Black wire connects to Positive (+) of the power supply and the Red
wire connects to Negative (-). The White wire is jumpered to the Red
wire while the White wire is connected to the LOAD. Jumper the
LOAD back to the Positive (+) to complete the circuit.
[AC Power]
[-]
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CALIBRATION
CALIBRATION
Step Eight
Step Nine
After it is installed in place, the LVP-51 series must be calibrated by the
user before operation. Everything needed for the procedure is self-con-
tained within the electronics of the LVP-51 series level switch. Two
dielectric states—full condition and empty condition—are measured by
the LVP-51 series, and then averaged to set the threshold between
“wet” and “dry” at the sensor. The empty state must be at least 6"
below the bottom of the sensor for calibration. The full state must be
to the top of the sensor (not just to the point of actuation) for calibra-
tion. The actual application fluid at its intended operating temperature
must be used during calibration. Use the following procedure assumes
that the sensor has already been wired to a power supply.
Checking the Point of Actuation:
Raise the fluid level to the point
where the sensor sends a “wet”
signal (Input LED will turn
1"
max.
Full
Calibration
Point
Amber on Omega controllers).
The “dry” signal should be
sent when the fluid level is
lowered (Input LED will turn
Green on Omega controllers).
Point of
Actuation
(POA)
The actual Point of Actuation
(POA) depends on many variables,
including the thickness of the wall and
the dielectric value of the liquid. For
example, thicker tank walls can
1. Remove the cap from the sensor body by loosening the two
screws located below the sensor. Do not remove the screws from
the sensor. Insert a small screwdriver into the small slot at the
edge of the cap and gently pry upwards.
6"
min.
raise the POA while thinner
walls could lower the POA.
Empty
Calibration
Point
2. Looking down you will see a small three-position switch and two
trimpots marked Full and Empty. You may start with whatever
state the tank is in.
Non-conductive
plastic tank wall
If the POA needs to be
changed, measure the distance and remount the
sensor in a new location.
3. Full state: With
EMPTY OPERATE FULL
the tank filled to
CAL
CAL
Do not attempt to change the Point of Actuation by intentional
miscalibration.
the top of the sen-
sor, set the switch
to the Full posi-
tion (right). Make
sure your hands or
any other objects
are not touching
the sensor while calibrating because this will cause a false read-
ing. Using a small nonmetallic screwdriver or alignment tool, turn
trimpot Full until the LED just lights, and no farther. Note the
position. Now turn the trimpot back until the LED turns off. The
ideal setting for the trimpot is midway between these on and off
points.
Switch
Screw Housings EMPTY
Empty Pot
FULL
If the sensor does not signal wet and dry reliably, it may be that:
•
•
•
•
•
the dielectric constant of the application fluid is too low
the tank wall is too thick for the application fluid
there are static or other electrical charges in the fluid
metal objects are within 6" of the sensor
Full Pot
LED
calibration was performed incorrectly
Try the calibration procedure again, after making corrections if possi-
ble. If the full and empty states are too similar dielectrically, it may
not be possible to use a capacitance sensor.
4. Empty state: With the tank drained to a point no closer than 6
inches below the bottom of the sensor, set the switch to the Empty
position (left). Set the Empty trimpot as in Step 3.
Testing the Sensor:
1. Power: Apply power to sensor, by connecting power to the con-
troller and/or power supply.
5. After completing calibration, make sure to return the switch to the
center position. Snap the cap back on by pressing down, and tight-
en the two screws.
2. Full condition: Fill the tank with the application liquid, by filling
the tank up to the sensor’s point of actuation.
3. Test: With the sensor being fluctuated between wet and dry states,
use a multimeter to ensure that the correct signals are being pro-
duced by the LVP-51 series level switch, or observe the sensor
indicator light in the controller.
Operate
Empty
Cal
Full
Cal
Switch
4. Point of Actuation: Observe the point at which the rising or
falling fluid level causes the sensor to change state, and move the
installation of the sensor if necessary.
Maintenance:
Full
Pot
Empty
Pot
The LVP-51 series level switch itself requires no periodic mainte-
nance except cleaning as required. However, periodically clean any
coating or scaling on the tank wall the sensor is attached to and check
the calibration. It is the responsibility of the user to determine the
appropriate maintenance schedule, based on the specific characteris-
tics of the application liquids. In addition, any dripping or condensa-
tion between the sensor and the tank wall fitting may need to be peri-
odically cleaned to maintain accuracy.
LED
Screws
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