Omega Products LV4000 Installation Manual

®

LV4000 Series

Continuous Level

Measurement Probe

®

Contents

Introduction .................................................4

Models & Dimensions .........................................5

Wiring Diagram

Mounting Note

Installation .................................................12

Calibration .................................................16

Handling ..................................................18

Technical Specifications ......................................19

Trouble Shooting

..............................................6

..............................................11

............................................20

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03

Introduction

LV4000 ­Capacitive Continuous
Level Measurement Sensor

The LV4000 Series is a capacitance continuous level transmitter with
an integrated electronics module mounted within the housing. This 2
wire loop powered unit provides a 4-20mA output and
measure the level in most industrial applications The LV4000 is
available in 316SS rod and connection or with optional ETFE tubing or
ECTFE coatings (required for conductive or aggressive mediums) on
the rod.
or reference sheath built into the process connection.
calibration is achieved with a zero and span adjustment which works
best when starting with an empty tank to set the zero and then filling it
to set the span.

The wide range of applications for RF analog level measurement
probes (such as liquids, pastes, solids and granules), requires
attention in selecting the correct configuration and installing it in the
proper location.

The LV4000 can also bemade with a secondary reference rod

is designed to

.

Set up and

®

How it works:

A capacitor consists of the probe’s rod as one plate and the metallic
wall of the vessel (ora secondary reference rod or sheath) as the other
plate. As the medium rises and displaces the empty space within the
vessel, the dielectric constant around the probe changes. This change
is recorded and converted into a 4…20mA output signal which is
proportional to the level within the vessel. By using this principle, the
LV4000 Series can be applied in a wide range of products such as
most liquids, powders,pastes and granular mediums.

Features

Used in a wide range of application/industries

Accurate and reliable measurement.

No moving parts - Rugged construction.

Can operate at hight temperatures and pressure.

Functions on conductive as well as non-conductive medias.

04

Housing Types

Models and Dimensions

Small Aluminum

126mm

76mm

89mm

Nylon

80mm

Mounting Options for LV4000

50mm

Extended necks for medium (up to 120°C) and high temperature (up to 150°C)temperature

Standard

20

L

1”NPT

½”

Reference Sheath

20

L

1”NPT

89mm

Reference Rod

25

L

100mm

Large Aluminum

130mm

130mm

118mm

Cable

(also w/ reference cable)

66

1 1/2”NPT

½”

1/4”

1,6

½”

Note: Minimal insertion for the LV4000 is ½ meter

Process Connections

Tri-Clamp Flange

2”

3”

3/4”

1”

1½”

2”

Threaded

NPT

1,75

BSP

1½”

2½”

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TC Connection

Rubber Seal

Process Connection

1”

1½”

2”

2½”

FF

RF

ANSI 150#
ANSI 300#

05

Wiring Diagram

LV4000 Nylon Housing

A- Sensibility (Adjust Gain)
B- Adjust Sensibility (Sub Gain)
C- Adjust Zero (begin scale)
D- Adjust de span (end of scale)

1- Power Supply (+)
2- Power Supply ( )
3- Ground

12...30Vdc / 4...20mA

Gain

1

+

®

A

B

C

D

2

0

2

_

2

0

Sub

3

Span

Zero

LV4000 Aluminium Housing

A- Sensibility (Adjust Gain)
B- Adjust Sensibility (Sub Gain)
C- Adjust Zero (begin scale)
D- Adjust de span (end of scale)

1- Power Supply (+)
2- Power Supply ( )

12...30Vdc / 4...20mA

3- Ground

06

A

B

C

2

1

+

LV4000

3

_

Gain

2

0

2

Sub

0

®

On

S

Z

D

Galvanic Isolator LI-420

Wiring Diagram

6mm

1- Probe (+)

2- Probe( )
11- Power Supply (+)
12- Power Supply ( )

11 12

+

LI-420

1

+

IN

4...20 mA

4...20 mA
Zone 0

OUT

_

69.8mm

®

_

2

DIN 35mm

LV4000 Alumium Housing with internal LI-420

A- Sensibility (Adjust Gain)
B- Adjust Sensibility (Sub gain)
C- Adjust Zero (begin scale)
D- Adjust de span (end of scale)

1- Power Supply (+)
2- Power Supply ( )

24Vdc / 4...20mA

3- Ground

B

A

111mm

83.5mm

D

C

1

+

4...20mA

24Vdc

(+-10%)

3

2

-

Zero

On

2

0

Sub

Gain

®

LV4000

Span

2

0

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07

Wiring Diagram

Different wiring scenarios for the Nylon Housing electronics

Important:
There are several types of PLC configurations and some of them have the negative terminal
grounded internally. In this case, a galvanic isolator must be used along with the probe to
distinguish both signals(negativeand ground).

Connecting directly into the power supply

2

2

0

Gain

1

+

10...30VDC

4...20mA

0

Sub

3

2

_

Span

Zero

0 ... 100 %

®

Gain

1

+

10...30VDC

Gain

1

+

10...30VDC

2

0

4...20mA

2

0

4...20mA

Ground

-

+

4 ... 20 mA

+

Power
Supply

_

Electrical connection using the Galvanic Isolator for a PLC with an active input card.

2

0

Sub

3

2

_

Span

Zero

Active PLC input card

+

PLC

_

+

-

Ground

Galvanic Isolator

1

+

LI-420

4...20 mA

4...20 mA

Zone 0

OUT

_

2

11 12

+

IN

_

Electrical connection using the Galvanic Isolator for a PLC with a passive input card.

2

0

Sub

3

2

_

Span

Zero

Power

Supply

_

+

Passive PLC input card

_

PLC

+

+

-

Ground

Galvanic Isolator

1

+

LI-420

4...20 mA

4...20 mA

Zone 0

OUT

_

2

11 12

+

IN

_

08

Wiring Diagram

Different wiring scenarios for the Small Aluminum Housing electronics

Connecting directly into the power supply

2

1

_

+

V=10...30VDC

I=4...20mA

2

1

_

+

V=10...30VDC

I=4...20mA

LV4000

3

2

0

2

0

Ground

-

+

®

On

Gain

Sub

S

Z

4 ... 20 mA

0 ... 100 %

+

Power
Supply

_

Electrical connection using the Galvanic Isolator for a PLC with an active input card.

LV4000

3

2

0

2

0

Ground

-

+

®

On

Gain

Sub

S

Z

Galvanic Isolator

1

+

LI-420

4...20 mA

4...20 mA

Zone 0

OUT

_

2

11 12

+

IN

_

Active PLC input card

+

PLC

_

Electrical connection using the Galvanic Isolator for a PLC with a passive input card.

2

1

_

+

V=10...30VDC

I=4...20mA

LV4000

3

2

0

2

0

Ground

-

+

®

On

Gain

Sub

S

Z

Galvanic Isolator

1

+

LI-420

4...20 mA

Zone 0

OUT

_

2

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Power
Supply

_

11 12

+

4...20 mA
IN

_

+

Passive PLC input card

_

PLC

+

09

Wiring Diagram

Different wiring scenarios for the Large Aluminum Housing electronics

The large aluminum housing offers a built in galvanic isolator. In this case a separate one is not
necessary.

Connecting directly into the power supply

®

LV4000

0 ... 100 %

Zero

Span

2

0

Sub

+

4...20mA

(+-10%)

3

1

2

-

24Vdc

On

2

0

Gain

®

4...20mA

+

Ground

-

4 ... 20 mA

+

Power
Supply

_

Electrical connection for a PLC with an active input card.

3

1

2

-

+

24Vdc

(+-10%)

On

2

0

Gain

®

LV4000

Zero

Span

2

0

Sub

Active PLC input card

+

PLC

_

+

Ground

-

4 ... 20 mA

Electrical connection for a PLC with a passive input card.

1

4...20mA

(+-10%)

3

2

-

+

24Vdc

On

2

0

Gain

®

LV4000

Zero

Span

2

0

Sub

4 ... 20 mA

Ground

-

+

Power

Supply

+

_

Passive PLC input card

_

PLC

+

10

Mouting Notes

Materials that are conductive will cause a
short circuit between a bare stainless steel
probe and the tank wall. For that reason we
recommend the use of ETFE or other types
of insulating coatings on the rod's surface.
(Fig. 1)

Material build-up also affects the accuracy
of RF capacitive measurements, and
therefore additional adjustment to the
probe's sensitivity is recommended in
applications where build-up is a concern.
(Fig. 2)

Housings must also be compatible with the
requirements for wash-down, wet, and/or
dusty environments. Hazardous
environments may require the housing to be
certified. In addition, the active probe might
need to be intrinsically safe or have an
intrinsic safety barrier. (Fig. 3)

The electronic circuitry of the probe
performs several functions such as
rectifying and filtering the incoming power,
generating the radio frequency signal,
measuring the changes in current flow,
analog signal generators and display
meters. The circuitry is provided with
potentiometer adjustments for setting
sensitivity that is located in the housing of
the probe. These adjustments give an
added level of fine-tuning which enable our
customers to control the probe's sensitivity
with greater accuracy .

(Fig. 3)

Variation in current input (power supply) to
the probe will affect the output. Therefore, a
stable power supply should be available.
(Fig. 4)

Conduit

Fig. 4

Wire Shield

Cable

Wires

Fig. 1

Fig. 3

Fig. 2

1

+

4...20mA

24Vdc

(+-10%)

Bare Rod

Coating (ETFE or ECTFE)

Conductive Medium

Steel Tank

Adjust Sensitivity

3

2

-

Zero

Span

On

2

020

Sub

Gain

Power Supply

Conduit

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Build up

11

Installation

®

Rod

Level

In order to achieve a linear output
signal, the main rod of the probe
must have a parallel reference
either to the tank or to a
secondary reference rod or
sheath. If the probe is mounted
without this parallel reference
within a cylindrical tank that is
mounted on its side, the output
signal will not be linear. Please
consult one of our applications
engineers if you have further
questions. (Fig.1 correct Fig. 2
incorrect)

Single Rod

Reference Rod

Fig. 1

Fig. 2

12

Level

L=y

L=z

L=x

When installing the probe either directly to the
tank, or utilizing a connection, the capacitance
probe should be mounted on the top of the tank,
never on the side or angle, so that the rod stays
parallel to the tank wall. (Fig. 1 correct Fig. 2
Incorrect)

The mounting location of the probe should stay
clear away from the point where the medium
enters, this will avoid false reading from the sensor
while being filled.(Fig. 1 correct Fig.2 Incorrect)

The recommended distance of installation of the
probe from the internal wall is a minimum of
500mm, and from the tip of the rod to the bottom of
the tank is 100mm, this will prevent a false signal
and possible build up between the wall and probe.
(Fig. 1 correctFig. 2 Incorrect)

Installation

Fig. 1

500mm

100mm

Fig. 2

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13

Installation

®

Sheath

The tank must be free from turbulence or
vortices throughout use. If this is not
possible we highly recommend a stilling
well or sheath. (Fig. 1 correct, Fig. 2
incorrect)

Ensure that mounting position does not
interfere with any obstructions wthin the
vessel or tank. (Fig. 1 correct, Fig. 2
incorrect)

Rod

Level

Fig. 1

Fig. 2

14

When installing the LV4000 with cable and
reference be sure that they are well connected
to the bottom of the tank and that ithas no slack.
(Fig. 1 correct Fig. 2 Incorrect)

The mounting location of the probe should stay
clear away from the point where the medium
enters, this will avoid false reading from the
sensor while being filled. (Fig. 1 correct Fig. 2
Incorrect)

The recommended distance of installation of
the probe from the internal wall is a minimum of
500mm, and from the tip of the pendulum to the
bottom of the tank is 100mm, this will prevent a
false signal and possible build up between the
wall and probe.(Fig. 1 correct Fig.2 Incorrect)

Installation

Fig. 1

500mm

Isolator

100mm

If the cable is secure to the bottom of the vessel
it must be isolated and the vessel is steel it must
be isolated so that it does not create a short
circuit.

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Fig. 2

15

Calibration

®

The dielectric value varies according to
the product, temperature, pressure,
rod's length and shape of the tank.
Because of these variations, the
parameters of the capacitive probe need
to be adjusted according to each
application as well as each tank. While
the LV4000 can be tested on a bench,the
results of calibrating it will not be the
same as calibrating the unit within the
actual tank thatyou plan on installingit in.

The LV4000 has 3 stages of sensitivity
and that can be adjusted by a selective
switch. Each stage has 3 subdivisions
(1, 2, 3) for the LV4000 and 4
subdivisions (1, 2, 3, 4) for the LV4000
with Aluminum housing to be combined
with the selective switch. Check the
values on the chart below according to
your application.

Capacitive Range forthe LV4000:

Gain Sub

1) 1600pF to5500pF 1 - 3750 to 5500pF
2 - 2500 to 3750pF
3 - 1600 to 2500pF

Nylon

2

0

Gain

2

1

_

+

Aluminum

Aluminum

2

0

Sub

3

Zero

2

Gain

0

2

Sub

0

1

+

V=10...30VDC

I=4...20mA

2

020

Sub

Gain

3

2

1

_

Span

Zero

+

10...30VDC

4...20mA

2

3

_

®

LV4000

On

2

Gain

0

2

Sub

0

S

Z

2) 400pF to1500pF 1 - 900 to 1500pF

2 - 600 to 900pF
3 - 400 to 600pF

3) 100pF to330pF 1 - 225 to 330pF
2 -150 to 225pF
3 -100 to 150pF

4) 25pF to150pF 1 - 150to 100pF

2 -100 to70pF
3 - 70to 25pF

16

On

Gain

Zero

2

0

2

0

Sub

®

3

1

2

LV4000

-

+

4...20mA

24Vdc

(+-10%)

Zero

Span

On

2

020

Sub

Gain

Calibration

Adjustment (4-20mA):

It is recommended that a multimeter be connected
according to the figure below (fig.5) to monitor the
current value during the calibration. Prior to
calibration it is recommended that both
potentiometers are reset. Turn both potentiometers
counter-clockwise until they stop (or approximately
20 turns). (Fig.1)

1) Drain thetank to minimum level(Zero% or 4mA).

2) Select the Gain switch 1,2,3 and Sub positions

1,2 or 3.It is recommendedto begin with Gain switch
1 and Subposition 1. (Fig. 2)

3) Use the Zero potentiometer to set the current
value for the actual level to 4mA. Turn the
potentiometer clockwise to increase current. Turn
the potentiometer counter-clockwise to decrease
current (If the adjustment wasn't possible, alter the
Sub and Gain position and try in adjust the minimum
value (4mA) throughthe Zero Potentiometer)(Fig.3)

4) After calibrating the minimum value (4mA), fill up
the tank tomaximum level. (100% -level)

5) The Sub and Gain switches should be in the same
position as adjustedto 4mA.

6) Use the Span potentiometer to set the current
value for the actual level to 20mA. Turn the
potentiometer clockwise to increase current. Turn
the potentiometer counter-clockwise to decrease
current. (Fig.4)

Fig.1

Fig.2

Fig.3

Fig.4

Zero

Zero

Zero

Zero

Sub

Span

2

0

Sub

Span

2

0

Sub

Span

2

0

Sub

Span

2

0

On

2

0

Gain

On

2

0

Gain

On

2

0

Gain

On

2

0

Gain

7) If the current is lower than 20mAafter fully turning
the Span Potentiometer clockwise, it is necessary to
increase the sensitivity by selecting the next level of
the switch (Sub and Gain). If the current still remains
lower than 20mA, continue on to the next level until
you achieve 20mA.

8) With the 20mA signal adjusted it is best to re­adjust the Zero. Drain the tank back down to the
starting level and re-adjust (if necessary) the
minimum level to 4mA one more time. After this
stage, set-up iscomplete.

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Fig.5

17

Handling

®

Probes:

Seal the thread with Teflon tape before
installation (Fig. 1).

Do not turn or handle by the housing (Fig. 2).

When tightening the sensor, use only use the
316S.S. hexagon fitting to achieve a seal, do not
twist with thebody of the sensor. (Fig. 3)

The probe should not be dropped or suffer any
impact or fall that could damage the electronics or
the coating ofthe probe (Fig. 4and 5).

Periodic visual inspection of the probe is required
to check for corrosion or deposit build-up. If
deposits are found, clean the sensor to ensure
optimum performance.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Care should be taken when handling and installing
probes with coated rods to avoid scratching them.
Scratching the coating could interfere with the
probe performance.

When cleaning the rod use a soft brush or any
other similar object.

18

Fig. 5

Housing Nylon

LV4000

2

020

Sub

Gain

3

2

1

_

Span

Zero

+

®

Technical Specifications

LV4000

Small Housing Aluminum

®

3

2

1

LV4000

On

2

Gain

0

_

+

2

Sub

V=10...30VDC

0

I=4...20mA

S

Z

Large Housing Aluminum

®

3

1

2

LV4000

-

+

4...20mA

24Vdc

(+-10%)

Zero

Span

On

2

020

Sub

Gain

Application

Operating Voltage

Current Consumption

Adjustment

Sensitivity Range

Frequency Oscillation

Output

Accuracy

Repeatability

Level Indication

Electrical Connection

Process Connection

Wetted Parts

Enclosure Material

Continuous Level Measurement for Liquids and Solids

12..30Vdc Housing (Small Nylon and Aluminum)

24Vdc (+/- 10%) / Large Housing (Small Nylon/Alum. w/ LI-420)&

22mA max

Zero & Span Potentiometer

100 to 5500pF

400 kHz

4...20mA

0.5%

+/- 1mm

--

Cable gland - 1/2” NPT conduit entry or M12 connector

3/4” to 1 1/2” BSP or NPT Flange or Sanitary Connections

316 Stainless Steel, ETFE, ECTFE

Glass filled nylon, Aluminum

Max Pressure

Operating Temperature

Class Protection

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290 PSI (20 Bar)

14 to 248º F (-10 to 120ºC)

(IP 65)

19

Trouble Shooting

®

Fault

No signal

Signal over

22mA

Signal Fluctuating

Signal under

20mA

Lack of linearity

Cause Solution

No power supply

Inadequate connection

Probable short circuit

Sensitivity to high

Lack of signal from

referance rod

Sensitivity to low

Reference is incorrect

Coating on the rod

is damaged

Verify power supply

Verify the polarity of the power supply

Verify that the rod is coated for

conductive mediums

Adjust sensibility again

Verify the grounding

Adjust sensibility again

Add a Reference

Sheath the rod

Send back for repair

20

M-3997/0912