Omega Products LVCN700 Installation Manual

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®

User’s Guide

LVCN700 Series

Multi-Point Ultrasonic Level Switch

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 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 should malfunction, 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 unautho-

rized modification. 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 are not warranted, including but 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 writ-

ten. OMEGA warrants only that the parts manufactured by it will be as specified and free of defects.

OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATS0EVER,

EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY

WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DIS-

CLAIMED. 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 spe-

cial 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 W

ARRANTY

RETURNS, please have the fol-

lowing information available BEFORE contacting

OMEGA:

1. P.O. 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. P.O. number to cover the COST

of the repair,

2. Model and serial number of 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 1996 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 prior

written consent of OMEGA ENGINEERING, INC.

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USA: One Omega Drive, Box 4047

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FAX: [phone]

email: [e-mail]

For immediate technical or application assistance:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA

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Customer Service: 1-800-622-2378 / 1-800-622-BEST

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Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

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[e-mail]

Servicing Europe:

Czech Republic: Frystatska 184, 733 01 Karvina, Czech Republic

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Toll Free: 0800-1-66342

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Tel: [phone]

FAX: [phone]

Toll Free in Germany: 0800 639 7678

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It is the policy of OMEGA 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 Engineering, Inc. accepts no liability for any errors it con-

tains, and reserves the right to alter specifications without notice.

WARNING: These products are not designed for use in, and should not be used for, patient connected applications.

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Step One

SPECIFICATIONS

Range: LVCN704: 2" to 4'

(5 cm to 1.2m)
LVCN709: 4" to 9.8'
(10 cm to 3m)
LVCN716: 4" to 16.4'
(10 cm to 5m)
LVCN126: 8" to 26.2'

(20 cm to 8m)
Repeatability: 0.25" (6 mm)
Adjustability: Over entire range
Hysteresis: LVCN704/709: 0.5" (1.2 cm)

(single set point)

LVCN716/726: 1" (2.5 cm)

(single set point)
Beam width: LVCN704/709: 2" (5 cm) dia.

LVCN716/726: 3" (7.6 cm) dia.
Dead band: LVCN704: 2" (5 cm)

LVCN709/716: 4" (10 cm)

LVCN726: 8" (20 cm)
LED indication: Power, relay and echo status
Calibration: Target, push button
Memory: Non-volatile
Supply voltage: AC: 95-250 VAC

DC: 12-28 VDC (Optional)
Consumption: AC: 20 watts max.

DC: 100 mA @ 24 VDC (Optional)
Contact type: (3) SPDT relays
Contact rating: 60 VA
Contact logic: Single point: alarm

Two point: latching or

out of bounds alarms

Duplex or Alternation:

(Relays 1 and 2 only)
Contact fail-safety: De-energizes during echo signal loss
Process temp.: F: -4° to 140°

C: -20° to 60°
Temp. comp.: Automatic
Electronics temp.: F: -40° to 160°

C: -40° to 71°
Pressure: 30 psi (2 bar) @ 25° C., derated @

1.667 psi (.113 bar) per °C. above

25° C.
Enclosure rating: NEMA 4X (IP65)
Enclosure vent: Water tight membrane
Encl. material: PC/ABS FR
Trans. material: PVDF Kynar®
Process mount: LVCN704/709: 1" NPT (1" G)

LVCN716/726: 2" NPT (2" G)
Mount. gasket: Viton®
Conduit entrance: Dual, 1/2" NPT
Classification: General purpose
CE compliance: EN 61326 EMC

[DC series only (DC powered)]

Handling Static-Sensitive Circuits/Devices: When han-

dling the Ultrasonic switch, the technician should follow
these guidelines to reduce any possible electrostatic charge
build-up on the technicians body and the electronic part.

1. Always touch a known good ground source before handling the

part. This should be repeated while handling the part and more
frequently after sitting down from a standing position, sliding
across the seat or walking a distance.

2. Avoid touching electrical terminals of the part unless making connections.

3. DO NOT open the unit cover until it is time to calibrate.

1.2"

(32 mm)

1.9"

(49 mm)

3.9"

(100 mm)

5.2"

(133 mm)

2.4"

(62 mm)

1" NPT

(1" G)

0.75"

(19 mm)

LU75

LU72

2.5"

(63 mm)

4.5"

(114 mm)

5.2"

(133 mm)

3.0"

(76 mm)

2" NPT

(2" G)

1.7"

(44 mm)

4.1"

(104 mm)

5.2"

(133 mm)

3.8"

(96 mm)

40

30

20

10

00

-40 -20 00 20 40 60 80

Acceptable

Range

Unacceptable

Range

Temperature/Pressure Derating

Operating Pressure (psi)

Temperature (C¡)

LVCN716
LVCN726

Enclosure (Side View)

LVCN704
LVCN709

Enclosure (Side View)

LVCN700 Series

Enclosure (Top View)

INTRODUCTION TECHNOLOGY

Step Three

A. Application: The general purpose ultrasonic level switch pro-

vides non-contact level detection up to 26’ or 8m with 3 relays. Each
relay can be configured on a single set point alarm, two latched set
points for automatic fill or empty, two set points for out of bounds
alarms or three set point (relays 1 and 2 only) alternation / duplexing
. The switch is well suited for a wide range of corrosive, waste and
slurry type media, and is broadly selected for atmospheric day tank,
pump lift station and waste sump applications.

B. Part Number: The part and serial numbers are located on the
wrench flat. Check the part number on the product label and confirm
which of the below model configurations you have purchased:

P

ar

t Number Range Supply Mount

LVCN704 4’ (1.2m) 95-250 VAC 1” NPT
LVCN704G 4’ (1.2m) 95-250 VAC 1” NPT
LVCN704-DC 4’ (1.2m) 12-28 VDC 1” NPT
LVCN704G-DC 4’ (1.2m) 12-28 VDC 1” NPT
LVCN709 9.8’ (3m) 95-250 VAC 1” NPT
LVCN709G 9.8’ (3m) 95-250 VAC 1” NPT
LVCN709-DC 9.8’ (3m) 12-28 VDC 1” NPT
LVCN709G-DC 9.8’ (3m) 12-28 VDC 1” NPT
LVCN716 16.4’ (5m) 95-250 VAC 1” NPT
LVCN716G 16.4’ (5m) 95-250 VAC 1” NPT
LVCN716-DC 16.4’ (5m) 12-28 VDC 1” NPT
LVCN716G-DC 16.4’ (5m) 12-28 VDC 1” NPT
LVCN726 26.2’ (8m) 95-250 VAC 2” NPT
LVCN726G 26.2’ (8m) 95-250 VAC 2” NPT
LVCN726-DC 26.2’ (8m) 12-28 VDC 2” NPT
LVCN726G-DC 26.2’ (8m) 12-28 VDC 2” NPT

C. NEMA 4X Enclosure:The enclosure has a flip cover with two
1/2” NPT female conduit ports and an internal terminal strip for
wiring. To open the enclosure, you will need a small insertion tool
such as a screwdriver. Insert the tool into the hole located at the
front of the enclosure and gently push on the latching mechanism
to release the cover. Rotate the hinged cover up for 135° access to
the faceplate and terminal strips. Before closing the enclosure,

make sure that the enclosure gasket is properly seated, and
that any conduit fittings, cable connectors or plugs are
installed correctly and sealed.

Step Tw o

About this Manual: PLEASE READ THE ENTIRE MANU-

AL PRIOR TO INSTALLING OR USING THIS PRODUCT. This
manual includes information on the LVCN700 series
Ultrasonic Level Switch. Please refer to the part number
located on the switch label to verify the exact model con­figuration which you have purchased.

User’s Responsibility for Safety: Omega manufactures a

broad range of level sensing 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.

Proper Installation and Handling: Only properly trained

staff should install and/or repair this product. Install the switch with
the included Viton gasket and never overtighten the switch within
the fitting. Always check for leaks prior to system start-up.

Wiring and Electrical: A supply voltage of 95-250 VAC is

used to power the Ultrasonic switch, and a supply voltage of 12-28
VDC is used to power the optional DC version of the LVCN700
series Ultrasonic switch. Electrical wiring of the switch should be
performed in accordance with all applicable national, state, and
local codes.

Material Compatibility: The LVCN700 series enclosure is

made of a flame retardant Polycarbonate (PC/ABS FR). The trans­ducer is made of Polyvinylidene Fluoride (PVDF). Make sure that
the model which you have selected is chemically compatible with
the application media.

Enclosure: While the LVCN700 series housing is liquid-resis-

tant, the unit is not designed to be operational when immersed. It
should be mounted in such a way that the enclosure and transduc­er do not come into contact with the application media under nor­mal operational conditions.

Make a Fail-Safe System: Design a fail-safe system that

accommodates the possibility of switch and/or power failure.
OMEGA recommends the use of redundant backup systems and
alarms in addition to the primary system.

Flammable, Explosive or Hazardous Applications:

The LVCN700 series should not be used within classified haz-

Warning

Always use the Viton gasket when installing the Ultrasonic
switch, and make sure that all electrical wiring of the switch
is in accordance with applicable codes.

LVCN726

Shown

RELAY

1

RELAY2RELAY

3

L

1 L2

POWER

Cal. Run

High Low

Select

Step Four Step Five

CALIBRATION

A. Introduction: The switch has two modes, the RUN and CAL

modes. In the RUN mode, the switch is operational and the relay(s)
will energize or de-energize at the calibrated set point distances. In the
CAL mode, the relay set point distances and states may be target-cal­ibrated into memory. The switch arrives from the factory without
any preset calibration. Each relay channel may be user calibrated
into one of the following configurations; 1) high or

low level alarm,

2) high and

low level out of bounds alarm, 3) automatic fill or empty,

or 4) duplexing/Alternating.

High or Lo

w Level Alarm: The high or

low level alarm is programmed with a sin­gle set point at the desired tank level.
Configured as a high alarm, the relay will
energize if the level rises above the set
point. Configured as a low level alarm, the
relay will energize if the level falls below
the set point.

High and Lo

w Level Out of Bounds

Alarm: Programmed with two set points,

the high and low level out of bounds alarm
protects the top of the tank from overspill
and the bottom of the tank from run-dry. If
the level rises above or falls below the set
points, the relay will energize. The relay
will remain de-energized as long as the level
is in between the set points.

A

utomatic Fill or Empty: Programmed

with two set points, the latched automatic
fill or empty will control a pump or valve.
When the level reaches the energize set
point, the latching relay will energize, and
remain energized until the level reaches the
de-energize set point.

Duple

x/Alternate: Programmed with

three set points and two relays, duplexing
will automatically fill or empty the tank
with two pump alternation for maintenance
and lead-lag control for back up operation.
When the level reaches the energize set
point, the latching relay will energize, and
remain energized until the level reaches the
de-energize set point. Each time the level
reaches the energize set point, the relays will alternate. If the level
reaches the back-up energize set point, both relays will energize until
the level reaches the de-energize set point. Alternation will automati­cally fill or empty the tank with two pumps switching after each cycle.

PREPARATION

A. Supply V oltage: The power supply voltage should never exceed

the maximum rating of 250 VAC for the LVCN700 series AC switch
or 28 VDC for the LVCN700-DC series switch.

B. Conduit Entrance: The enclosure has two 1/2” NPT female
conduit ports for routing of the switch
supply and relay circuit wiring. Do not

run mixed AC and DC voltages
through the same conduit port. Route

the supply voltage circuit through one
port and the relay circuit(s) through the
opposite port.

C. Relay Fail-Safe Design:

The switch has (3) relay channels. Each relay is a SPDT
(single pole, double throw) type rated at 60 VA. Normally
open (NO) or normally closed (NC) operation is user
selected based on the desired system control and fail-safe
logic. Always design a fail-safe system that accommo-

dates for the possibility of relay and/or power failure. The "nor­mal" relay state is where the relay coil is de-energized and the Red
relay LED is OFF. Therefore, if power is cut OFF to the switch it will
de-energize the relay . Make sure that the de-ener gized state is the safe
state in your system design. As such, if switch power is lost, a pump
will turn OFF if it is connected to the normally open side of the relay.

E. Maximum Applied Range: Individual or cumulative effects of
agitation, vapor or foam can reduce the overall quality of signal return
and shorten the maximum applied range of the switch. To determine
the maximum applied range of the switch in your application, refer to
the below derating chart.

LVCN700 series

shown

1/2 NPT
Conduit

Supply

Port

Relay

Port

Ultrasonic Derating Chart

LVCN704/709 LVCN716/726

Agitation = 1-3 @ 100 kHz Agitation = 1-3 @ 50 kHz
Vapor = 4-6 @ 100 kHz Vapor = 3-5 @ 50 kHz
Foam = 5-6 @ 100 kHz Foam = 4-6 @ 50 kHz

(Auto-Fill Shown)

LVCN700-DC series

shown

POWER

L1 L

VAC

2

HOT
NEUTRAL

VAC

INPUT

POWER

(+) (-)

VDC

Positive
Negative

INPUT

VDC

RELAY

1

0%

100Khz

50Khz

Energize

De-energize

High Alarm Shown

Energize

De-energize

Energize

De-energize

Energize

50%

100%

012345678910

Energize
(Primary)

High

Energize
(Backup)

High High

De-energize (All) Low

Step SevenStep Six

CALIBRATION

B. Calibration Tools: To target calibrate the switch set points, you

will need the appropriate power supply (95-250 VAC or 12-28 VDC
for DC version), tape measurer, flat reflective target such as a wall, and
optional Omega box insert for use as a product holder.

C. Off Tank T arget Calibration: The switch’s relay set points may
be target calibrated OFF the tank or installed ON the tank. Generally,
target calibration is done OFF the tank because it is easier to move the
switch rather than raise or lower the liquid level to the desired relay
set point distances. Locate a flat reflective calibration target such as a
wall. Place the switch perpendicular to the target in the provided
Omega box insert or equivalent
holder. Alternatively, you may

hold the switch with your hand,
but it is critical that prior to
entering any relay set point dis­tances, the product is held
steady and perpendicular to the
target for at least 15 seconds. If

calibrating against a wall, it is
recommended that the switch be
elevated 3’ (1m) off the ground
by placing it on a table or equiv­alent flat surface.

D. Entering the CAL Mode:To enter the CAL mode, you must

first disable the calibration lock out feature. To do so, press and hold
the SELECT button down. While holding the SELECT button, slide
the RUN/CAL switch LEFT to the CAL position, and then release
the SELECT button. At this point, all relay LEDs should be OFF.

E. Selecting a Relay Channel: After entering the CAL mode,

press the SELECT button once and the Relay 1 LED will turn ON
indicating that the channel is now active for set point calibration.
Press the SELECT button again until the desired Relay channel
becomes active.

F. Erasing a Relay Channel:With the exception of new prod-

ucts out of the box, all previously entered relay set points should be
erased prior to new programming with the following procedure:

1. Enter CAL mode and SELECT the relay channel to erase.

2. Simultaneously press and hold down both the HIGH and LOW

buttons, and then release the buttons.

3. The Relay and Power LEDs will blink in an alternating pattern

indicating that the relay set points have been erased.

4. At this point, once the LED becomes solid, you may either re-pro-

gram the channel with new set points or leave it inactive.

PROGRAMMING

A. Programming a Relay Channel: The relay set points are tar-

get calibrated using the appropriate HIGH and/or LOW two key­stroke button sequence at each target distance (D1=distance one, D2
= distance two and D3 = Distance 3) per the following logic.

Relay Function

Button Sequence @ Distance(s)

1. High level alarm High-High (D1)

2. Low level alarm Low-Low (D1)

3. Out of bounds alarm High-High (D1) & Low-Low (D2)

4. Automatic fill Low-High (D1) & High-Low (D2)

5. Automatic empty High-Low (D1) & Low-High (D2)

6. Duplexing/Alternation [High-Low (D1) & Low-High (D2), Rly 1]
& [High-High (D3), Rly 2]

B. Programming a High or

Low Level Alarm: After having

powered the switch with the appropriate supply voltage, entered the
CAL mode, selected a relay channel and erased any previously input
set points, follow the below procedure (LOW level alarm instructions
are in parenthesis):

1. Stretch the tape measurer out to the appropriate distance in

between the switch and target.

2. Position the switch at the desired HIGH (LOW) set point distance

defined as the air gap space between the transducer and the target.

Make sure that the switch is stationary and perpendicular to
the target before continuing.

3. Press the HIGH (LOW) button

for the first key-stroke and the
Relay LED will blink once.

4. Press the HIGH (LOW) button

again for the second key-stroke
and the Relay LED will blink
twice.

5. The Power LED will flash from

AMBER to GREEN when the
set point has been accepted into
memory.

6. Press SELECT to program the next relay channel or slide the

RUN/CAL switch RIGHT to exit the CAL mode.

T

High Level Alarm

Low Level Alarm

After the second High or Low button key-stroke, the Power
LED will flash from AMBER to GREEN indicating that the set
point has been accepted into memory. If all three Relay LEDs

flash RED and remain ON, then the button sequence was done
incorrectly. If so, press SELECT to return to the appropriate

relay channel and erase the previous set points per the CALI­BRATION section (Step #6-F) of this manual.Then re-program
the channel with the correct button sequence.

Set Point

Calibration

Tape

Box

Insert

Table

Cal. Run

High Low

Select

L

RELAY

1

RELAY2RELAY

1 L2

POWER

3

Set Point
Distance

Target

Wall

High or Low Level Alarm

Programming

ape

Box

Insert

Set Point
Distance

Table

Target

Wall

Energize

De-energize

De-energize

Energize

Step Eight

PROGRAMMING

Step Nine

PROGRAMMING

C. Programming a High and

Low Level Out of Bounds

Alarm: After having powered the switch with the appropriate supply

voltage, entered the CAL mode, selected a relay channel and erased
any previously input set points, follow the below procedure:

1. Stretch the tape measurer out to the appropriate distance in
between the switch and target.

2. Position the switch at the desired HIGH
set point distance defined as the lesser
of the two air gap spaces between the
transducer and the target. Make sure

that the switch is stationary and per­pendicular to the target before con­tinuing.

3. Press the HIGH button for the first key­stroke and the Relay LED will blink
once.

4. Press HIGH again for the second key-stroke and the Relay LED
will blink twice.

5. The Power LED will flash from AMBER to GREEN when the
HIGH set point has been accepted into memory.

6. Position the switch at the desired LOW set point distance defined
as the greater of the two air gap spaces between the transducer and
the target. Make sure that the switch is stationary and perpen-

dicular to the target before continuing.

7. Press LOW for the first key-stroke and the Relay LED will blink
three times.

8. Press LOW for the second key-stroke and the Relay LED will
blink four times.

9. The Power LED will flash from AMBER to GREEN when the
LOW set point has been accepted into memory.

10. Press SELECT to program the next relay channel or slide the
RUN/CAL switch RIGHT to exit the CAL mode.

Out of Bounds

D. Programming Automatic Fill: After having powered the

switch with the appropriate supply voltage, entered the CAL mode,
selected a relay channel and erased any previously input set points,
follow the below procedure:

1. Stretch the tape measurer out to the appropriate distance in
between the switch and target.

2. Position the switch at the desired LOW
set point distance defined as the greater
of the two air gap spaces between the
transducer and the target. Make sure

that the switch is stationary and per­pendicular to the target before con­tinuing.

3. Press the LOW button for the first key­stroke and the Relay LED will blink
once.

4. Press the HIGH button for the second key-stroke and the Relay
LED will blink twice.

5. The Power LED will flash from AMBER to GREEN when the
LOW set point has been accepted into memory.

6. Position the switch at the desired HIGH set point distance defined
as the lesser of the two air gap spaces between the transducer and
the target. Make sure that the switch is stationary and perpen-

dicular to the target before continuing.

7. Press the HIGH button for the first key-stroke and the Relay LED
will blink three times.

8. Press the LOW button for the second key-stroke and the Relay
LED will blink four times.

9. The Power LED will flash from AMBER to GREEN when the
HIGH set point has been accepted into memory.

10. Press SELECT to program the next relay channel or slide the
RUN/CAL switch RIGHT to exit the CAL mode.

Automatic Fill

6

2

2

6

Energize

De-energize

Energize

De-energize

Energize

High and Low Level

Out of Bounds Alarm Programming

Tape

Box

Insert

Table

Low

Set Point

Distance

High

Set Point

Distance

Target

Wall

Automatic Fill

Programming

Tape

Box

Insert

Table

Low

Set Point

Distance

High

Set Point

Distance

Target

Wall

Step Ten

PROGRAMMING

E. Programming Automatic Empty: After having powered the

switch with the appropriate supply voltage, entered the CAL mode,
selected a relay channel and erased any previously input set points,
follow the below procedure:

1. Stretch the tape measurer out to the appropriate distance in
between the switch and target.

2. Position the switch at the desired HIGH
set point distance defined as the lesser
of the two air gap spaces between the
transducer and the target. Make sure

that the switch is stationary and per­pendicular to the target before con­tinuing.

3. Press the HIGH button for the first key­stroke and the Relay LED will blink
once.

4. Press the LOW button for the second key-stroke and the Relay
LED will blink twice.

5. The Power LED will flash from AMBER to GREEN when the
HIGH set point has been accepted into memory.

6. Position the switch at the desired LOW set point distance defined
as the greater of the two air gap spaces between the transducer and
the target. Make sure that the switch is stationary and perpen-

dicular to the target before continuing.

7. Press the LOW button for the first key-stroke and the Relay LED
will blink three times.

8. Press the HIGH button for the second key-stroke and the Relay
LED will blink four times.

9. The Power LED will flash from AMBER to GREEN when the
LOW set point has been accepted into memory.

10. Press SELECT to program the next relay channel or slide the
RUN/CAL switch RIGHT to exit the CAL mode.

Automatic Empty

2

6

Step Eleven

PROGRAMMING

Programming Duplexing Pump Control: After having powered

the switch with the appropriate supply voltage, entered the CAL
mode, selected relay channel 1 and erased any previously input set
points, follow the below procedure:

1. Stretch the tape measurer out to the appropriate distance in
between the switch and target.

2. Position the switch at the desired HIGH
set point distance defined as the lesser
of the two air gap spaces between the
transducer and the target. Make sure

that the switch is stationary and per­pendicular to the target before con­tinuing.

3. Press the HIGH button for the first key­stroke and the Relay LED will blink
once.

4. Press the LOW button for the second key-stroke and the Relay
LED will blink twice.

5. The Power LED will flash from AMBER to GREEN when the
HIGH set point has been accepted into memory.

6. Position the switch at the desired LOW set point distance defined
as the greater of the two air gap spaces between the transducer and
the target. Make sure that the switch is stationary and perpen-

dicular to the target before continuing.

7. Press the LOW button for the first key-stroke and the Relay LED
will blink three times.

8. Press the HIGH button for the second key-stroke and the Relay
LED will blink four times.

9. The Power LED will flash from AMBER to GREEN when the
LOW set point has been accepted into memory.

10. Press SELECT to program relay channel 2.

11. Position the switch at the desired HIGH HIGH set point distance
defined as the air gap space between the transducer and the target.

Make sure that the switch is stationary and perpendicular to
the target before continuing.

Duplex

Box

Insert

Table

Target

Wall

Tape

Duplex Programming

(Primary)

High

Set Point

Distance

Low

Set Point

Distance

2

6

Energize

De-energize

Energize
(Primary)

High

De-energize (All) Low

Energize
(Backup)

High High

Automatic Empty

Programming

Box

Insert

Tape

Table

Low

Set Point

Distance

Set Point

Distance

High

Target

Wall

A. Fitting Selection: Check the switch part number

to determine the required fitting mount size and
thread type. The switch is commonly installed in
tank adapters, flanges, brackets or stand pipes.

1. Adapter: Select a tank adapter fitting with

minimal height so as to ensure that the
installed transducer will not be substantially
elevated into the fitting. Avoid tank adapter
styles with threads and/or pipe stops forward
of the installed transducer.

2. Flange: Tall flanges with narrow risers

impede the acoustic signal. Select a fitting
with the right riser height versus inner diame­ter geometry. The switch may be elevated up
to 12” (30 cm) in a 6” (15 cm) riser, 8” (20
cm) in a 4” (10 cm) riser and 3” (7.6 cm) in a
2” (5 cm) riser.

3. Bracket: A LVM-30 side mount bracket or

equivalent can be used for open tank top
installations against the side wall.

4. Stand Pipe: A stand pipe may be
used to dampen turbulence or separate
surface foam. Select a 2” or larger
pipe for model LVCN704/709. Select
a 3” or larger pipe for model
LVCN716/726. The pipe length
should run the measurement span. Cut
a 45° notch at the bottom of the pipe
and drill a 1/4” pressure equalization
hole high in the dead band.

Step Thirteen

INSTALLATION

Adapter

VACUUM

Do not install at

angle relative

to the liquid

Do not install with-

in 3” of

tank side wall

Do not install

with objects
in the beam

Do not install

in applications

with vacuum

Warning

Install the appropriate installation fitting. Make sure that
the fitting and switch threads are not damaged or worn.
Install the switch with the included Viton mounting gasket.
Hand tighten the switch within the fitting. Perform an
installed leak test under normal process conditions prior to
system start up.

Gasket

Flange

on Riser

Height

Inner Diameter

Riser

Bracket

Stand Pipe

Step Twelve

PROGRAMMING

12. Press the HIGH button for the first key-stroke and the Relay LED
will blink once.

13. Press the HIGH button again for the second key-stroke and the
Relay LED will blink twice.

14. The Power LED will flash from AMBER to GREEN when the set
point has been accepted into memory.

15. Press the SELECT switch repeatedly until BOTH LEDs for Relay
1 and Relay 2 are ON (after Relay 3).

16. Press the HIGH button for the first key-stroke and Relay LED will
blink once.

17. Press the HIGH button again for the second key-stroke and Relay
LED will blink twice.

18. Press SELECT to program the next relay channel or slide the
RUN/CAL switch RIGHT to exit the CAL mode.

Note: The duplexing mode can be disabled by repeating Steps #15-18
and pressing the LOW button instead of the HIGH button in the
HIGH/HIGH combination.

Programming Alternating Control Only:

1. To program the switch for alternating
control only without the lead-lag func­tion, follow the instructions for
Programming Duplexing Pump Control
(Steps 11 and 12). The difference
between Duplexing and Alternation is
the location of the Relay 2 set point. Set
Relay 2 close to the deadband without
crossing into the deadband and above
the highest level of expected liquid.

Note: The alternation mode can be disabled
by repeating Steps #15-18 and pressing the
LOW button instead of the HIGH button in the HIGH/HIGH combi­nation.

Duplex Programming

Alternating

11

Alternating Programming

(Backup)

Box

Insert

Table

Target

Wall

Tape

Distance

Set Point

2

Programming Duplex Pump Control (continued):

(Backup)

Set Point
Distance

Target

Wall

Tape

Box

Insert

Table

High High

De-energize (All) Low

Energize

High

Ventilation
Hole

2"/3" Minimum
Diameter

Dead Band

Highest
Liquid Level

Operational Range

Lowest
Liquid Level

Step Fourteen

High Alarm

VAC

INPUT

HOT
NEUTRAL

Motor Starter

(Pump)

RELAY

1

RELAY2RELAY

3

L

1 L2

POWER

VAC

Cal. Run

High Low

Select

Low Alarm

VAC

INPUT

NEUTRAL
HOT

High Alarm

VDC

INPUT

HOT
NEUTRAL

Motor Starter

(Pump)

RELAY

1

RELAY2RELAY

3

(+) (-)

POWER

VDC

Cal. Run

High Low

Select

Low Alarm

VDC

INPUT

NEUTRAL
HOT

WIRING

Step Fifteen

TROUBLESHOOTING

A. Power LED SOLID GREEN in RUN Mode: During normal

operation in the RUN mode, the Power LED will remain solid
GREEN indicating that the switch has power and is tracking the level.
The RED Relay LEDs will be ON or OFF as programmed per the cur­rent level state.

B. P ower LED AMBER in RUN Mode:If while in the RUN mode,
the Power LED turns solid AMBER, this indicates that the switch has
power, but is not tracking the level and has entered into it’s FAIL­SAFE mode. Coincidently, all Relay LEDs will be OFF, indicating
that the relays are in their de-energized safe-state. The switch will
remain in the FAIL-SAFE mode until such time that it re-acquires the
level and automatically returns to normal operation as programmed.
Check the following points in determining why the switch is not
tracking the level:

1. Observe and attempt to correlate an application
event such as foaming, substantial vapor and/or
turbulence that may reduce or eliminate the
acoustic signal strength. Read the Maximum
Applied Range (Step #4-E) and consider rein­stalling the switch in a Stand-Pipe (Step #11-A-4)
to dampen turbulence and/or separate the point of
measurement from surface foam and/or vapor.

2. Verify the switch is installed correctly per the
INSTALLATION section (Step #11) of this manu­al. Initially focus on the fitting and/or obstructions
within the beam that may reduce or eliminate the
acoustic signal transmission-receipt. Consider
changing the fitting or relocating the switch to
another area of the tank.

3. Verify that the tank height is not greater than the
maximum range of the switch. If so, purchase and
install a switch with the appropriate range for your
tank height or level distance.

Installation

Application

Green

(Solid ON)

RED

(Solid ON or OFF)

Amber

(Solid ON)

RED

(All OFF)

C. Relay LED Changes State, But Relay Doesn’t Change:

Verify that the switch is wired correctly per the WIRING section
(Step #12) of this manual. If so, the Relays may have been damaged
due to a high inductive load or carbon build-up over time.

A. Wiring a LVCN700 series (95-250 VAC) to a Pump
(Automatic Fill or Empty) and (Independent High and Low)
Alarms

Warning

To prevent damaging the relays, the use of an appropriate
motor starter or secondary relay is ALWAYS recommended
when actuating pumps or valves.

B. Wiring a LVCN700-DC (12-28 VDC) to a Pump (Automatic
Fill or Empty) and (Independent High and Low) Alarms

C. Wiring a LVCN700 (95-250 VAC) to Pumps (Duplex or
Alternating) and Alarm (Out of Bounds, High or Low)

L

RELAY2RELAY

RELAY

1

3

1 L2

POWER

L

RELAY

1

RELAY2RELAY

1 L2

POWER

3

HOT

VAC

NEUTRAL

INPUT

NEUTRAL
HOT

Alarm

Motor Starter

(Pump 1)

Motor Starter

(Pump 2)

VAC

INPUT

Duplex/Alternation

RELAY

1

RELAY2RELAY

High Low

Cal. Run

Select

3

L

1 L2

POWER

VAC

Relay 1
Relay 2

Energize

De-Energize

Energize

De-Energize

Backup

Primary

Stop

Relay 1
Relay 2

Energize

De-Energize

Energize

De-Energize

Backup

Primary

Stop

Duplexing

Control

Operation

Alternating

Control

Operation

OPERATION

Step Sixteen

Relay X

Energize

De-Energize

Start

Stop

Automatic

Empty

Operation

Automatic

Fill

Operation

Out of

Bounds

Operation

Relay X

Energize

De-Energize

Stop

Start

Relay X

Energize

De-Energize

High

Low

Functional Chart for Relay On/Off Operations