Omega Products LVU-1000 Installation Manual

LVU-

1000

Ultrasonic Level Measurement

System

Operator’s Manual

Unpacking instructions

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LVU-1000 Ultrasonic Level Measurement System (1)
Operator’s Manual (1)
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LVU-

1000

Series

System Description

Chapter 1
Chapter 2
Chapter 3

Chapter 4

Chapter 5

Chapter 6
Chapter 7

System Description
Principles of Operation
Installation

Control Unit Installation
Sensor Installation
Wiring Diagram
Sensor Diagram

System Features and Operating Modes

General
Standard Features
Optional Features

System Calibration

General ........................................ .

Calibration Procedure
Calibration Diagram
Specifications
Linear Characterization Rrief Description
Analog Output Calibration VERIFICATION Procedure

Programming Prompt list
System Configuration Document

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Figure 1

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Figure 3

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System Description

The OMEGA Model LVU-1000 series liquid level system is a
of-the-art level measurement instrument. Based on the latest
ultrasonic technologies, the LVU-1000 series provides an efficient,
reliable and cost effective means of level control.

The LVU-1000 series consists of 2 major components: a
contacting ultrasonic sensor and a compact, remote electronic
control.

The LVU-1000 series is available in a variety of sizes and materials to
suit virtually any application. Standard mounting configurations

%”

include a
to meet user specifications. Sensor materials of construction include
CPVC, 316 SS, Kynar or Teflon.

and 2 ” NPT fittings. Flange mounting is also available

Chapter 8

ii

Dimensional Drawings

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Dimensional Drawings

Figure 4

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System Description

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Principles of Operation

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Principles of Operation

In

operation, the electronics generates an electronic signal which is
converted by the sensor (mounted on
ultrasonic pulses. These pulses are transmitted through the air
towards the liquid surface. As the pulses reach the liquid surface,
they are reflected back to the sensor. These received echoes are
converted back to an electronic signal, which is then sent to the
microprocessor. The microprocessor uses the return signals to
calculate the time it takes for the pulses to travel to the liquid surface
and back. This “Time of Flight ” is directly proportional to the
distance of the liquid surface from the sensor. The microprocessor
then compares these calculated values with user programmed
system parameters to provide the required control outputs.

1-2

P ri nc ip les of Operation

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Con tr o l

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4.

Ins ta ll a ti on

The sensor is mounted on the top of the vessel with the sensor facing
downward. A clear path, free of any obstructions, must be provided
between the sensor and the liquid surface. Due to the narrow sensor
beam pattern, vertical-axis positioning of the sensor is important.
The sensor must be installed so as to maintain perpendicularity to
the liquid surface.

1.

2.

Open control unit enclosure and remove the printed circuit board.

Replace printed circuit board, and route power and control wiring
to the enclosure. Observe all applicable local electrical codes and

wiring procedures.
Connect power and control wiring to the control unit as shown in

the wiring diagram (see figure 1).

Be sure that all wiring is carefully dressed to prevent pinching
between the housing and the cover.

For sensors provided with an NPT threaded fitting, drill a suitable

hole in the vessel top and tap for the correct NPT thread. In thin
walled vessels, or vessels constructed of material not suitable for
tapping, weld or braze a bushing to accept the

Screw the sensor into the threaded fitting, being careful not to
cross thread the sensor. When possible, the use of a pipe
compound or sealing tape is recommended.

tightening!

2-2

For flange mounted sensors, simply bolt the sensor/flange

3 .

assembly to the proper mating flange connection.
Route the sensor cable to the electronic control unit and connect

4.
per the Wiring diagram (see figure 1).

IF ROUTING THE SENSOR CABLE THROUGH CONDUIT,
A DEDICATED CONDUIT SHOULD BE UTILIZED. AVOID
ROUTING THE SENSOR CABLE IN CLOSE PROXIMITY TO
ANY SOURCE OF ALTERNATING CURRENT OR RFI.