Tecfluid LU Series Manuale utente

R-MI-LU9X2 Rev.: 0

Series LU

Ultrasonic level transmitter LU9X2

Instructions manual

The art of measuring

Thank you for choosing a product from Tecﬂuid S.A.

This instruction manual allows the installation, conﬁguration,

programming and maintenance. It is recommended to read it before

using the equipment.

 This document shall not be copied or disclosed in whole or in any

part by any means, without the written permission of Tecﬂuid S.A.

 Tecﬂuid S.A. reserve the right to make changes as deemed

necessary at any time and without notice, in order to improve the

quality and safety, with no obligation to update this manual.

 Make sure this manual goes to the end user.

 Keep this manual in a place where you can ﬁnd it when you need

it.

 In case of loss, ask for a new manual or download it directly from

our website www.tecﬂuid.com Downloads section.

 Any deviation from the procedures described in this instruction

manual, may cause user safety risks, damage of the unit or cause

errors in the equipment performance.

 Do not modify the equipment without permission. Tecﬂuid S.A. are

not responsible for any problems caused by a change not

allowed. If you need to modify the equipment for any reason,

please contact us in advance.

PREFACE

WARNINGS

TABLE OF CONTENTS

SERIES LU9X2

1 INTRODUCTION ........................................................................... 6

2 WORKING PRINCIPLE ................................................................... 6

3 RECEPTION .................................................................................. 6

3.1 Unpacking .......................................................................... 6

3.2 Storage temperature............................................................. 7

4 INSTALLATION ............................................................................. 7

4.1 Measuring range ................................................................. 7

4.2 Obstacles in the vessel ....................................................... 8

4.3 Filling entries ........................................................................ 9

4.4 Foams ............................................................................... 9

4.5 Standpipe measurement ....................................................... 9

4.6 Temperature ...................................................................... 9

5 ELECTRICAL CONNECTION ........................................................... 10

5.1 Power supply and analog output wiring ................................ 10

5.2 Alarm outputs wiring ............................................................ 11

6 OPERATION ................................................................................. 12

6.1 Without display module ....................................................... 12

6.2 With display module ........................................................... 12

7 MAIN MENU .................................................................................. 13

7.1 Access codes to the menus ................................................ 14

8 INSTALLATION PARAMETERS ........................................................ 16

8.1 Tank .............................................................................. 16

8.1.1 Bottom distance ..................................................... 17

8.1.2 Top distance ......................................................... 17

8.2 Dead zone .......................................................................... 18

8.2.1 Dead zone current .................................................. 18

8.2.2 Dead zone length ................................................... 19

8.3 Diagnosis ............................................................................ 19

8.4 Operating mode .................................................................. 20

9 PROGRAMMING PARAMETERS ..................................................... 20

9.1 Measuring units .................................................................. 21

9.2 Decimals ............................................................................ 21

9.3 Filter ............................................................................... 21

9.3.1 Filter time .............................................................. 22

9.3.2 Hysteresis ............................................................. 22

9.3.3 Interference time ..................................................... 22

9.4 Outputs ............................................................................... 23

9.4.1 Analog output ......................................................... 23

9.4.1.1 Programming output 4-20 mA .................. 23

9.4.1.2 Current calibration for 4 and 20 mA .......... 24

9.4.2 Alarm outputs .......................................................... 24

9.4.2.1 Level ....................................................... 24

9.4.2.2 Dead zone ................................................ 26

9.4.2.3 No echo ................................................... 26

9.4.2.4 Disabled .................................................. 26

9.5 Default screen ..................................................................... 26

10 SERIAL NUMBER .......................................................................... 27

11 FIRMWARE VERSION ..................................................................... 28

12 CONTRAST ............................................................................... 28

13 OPERATION SCREEN ................................................................... 28

13.1 Indication of echo in dead zone ........................................... 29

13.2 Indication of absence of echoes ........................................... 29

14 ASSOCIATED SOFTWARE WINSMETER LU ................................... 30

14.1 USB cable connection and software installation ................... 30

14.2 Port connection .................................................................. 31

14.3 Password ........................................................................... 32

14.4 Access to “Installation” ....................................................... 35

14.4.1 Limits .................................................................... 35

14.4.2 Mode .................................................................... 35

14.4.3 Dead zone ............................................................. 35

14.5 Acces to “Programming” ..................................................... 36

14.5.1 Level ..................................................................... 36

14.5.2 Filter ..................................................................... 36

14.5.3 Current loop .......................................................... 37

14.5.4 Alarm outputs ......................................................... 37

14.5.5 Current loop calibration .......................................... 37

14.6 Visualization ....................................................................... 37

14.7 Datalogger ......................................................................... 38

14.8 Firmware updates ............................................................... 39

14.9 Conﬁguration ﬁle ................................................................ 40

15 TECHNICAL CHARACTERISTICS .................................................. 41

16 SAFETY INSTRUCTIONS ................................................................ 41

16.1 Certiﬁcate of conformity TR CU (EAC marking) ..................... 42

17 TROUBLESHOOTING .................................................................... 42

18 DIMENSIONS ............................................................................... 43

1INTRODUCTION

The series LU level transmitters are electronic equipment based on the transmission of

ultrasonic waves to measure the distance to a liquid or solid in a vessel.

The microprocessed electronic circuit offers the following features:

 Emission and reception circuits for the ultrasonic signals, and microprocessor

treatment.

 Alarm outputs with programmable hysteresis level.

 Programmable current output proportional to the distance or level.

 Quick current range programming by means of internal keys.

 Keyboard and 128x64 pixel graphic display module (optional).

2WORKING PRINCIPLE

An emitting circuit sends an electrical signal to a transducer that converts it into an ultrasonic

signal that propagates through the medium until it bounces off the surface of a liquid or solid.

The echo signal travels back until it reaches the transducer again and is converted into an

electrical signal.

By multiplying the time it takes for the signal to propagate by the speed of sound in the

medium, the travelled distance is obtained.

3 RECEPTION

The LU level transmitters are supplied conveniently packaged for their protection during

transportation and storage, together with their instructions manual for installation and

operation.

All the instruments are supplied tested in our facilities.

3.1 Unpacking

Unpack the instrument carefully, removing any remains of the packing .

Distance = vsound (t1+t2) / 2

Screw the instrument in the socket with an appropriate key, always by the ﬂat sides for this

purpose. The maximum torque is 25 Nm.

Never use the electronics housing for threading the device to the vessel.

Excessive tightening can damage the transducer irreparably.

4.1 Measuring range

The minimum distance that the instrument can measure is called dead zone. If the product

gets closer than that distance, the level transmitter indicates an alarm by means of the

current loop, that will be 3.6 mA or 22 mA depending on the programming (see point 8.2.1

on page 18). If the instrument has a display it will show the message “Dead zone”.

Never work within the dead zone. In certain circumstances, false level readings may occur.

3.2 Storage temperatures

Sensors of : PVDF -20ºC ...... +60ºC

PP -5ºC ...... +50ºC

4 INSTALLATION

To make the instrument work in the best conditions, it is important that the bottom face of

the sensor is installed parallel to the surface of the product to be measured. In the case of

liquids, the face of the transducer should be horizontal.

It is important to avoid installing the instrument at the center of the vessel. In some cases

unwanted echoes that affect the measurement may appear. The installation at the center is

only advantageous in vessels with tapered bottom, since distances can be measured to the

bottom.

The LU transmitters should be installed at a minimum distance of the walls of the vessel of

about 200 mm, so that they could not give unwanted reﬂections.

The socket where the instrument is installed should be such that the bottom of the

instrument exceeds at least 10 mm below it, as shown in the following ﬁgure.

Model Dead zone Max. distance (liquids) Max. distance (solids)

LU912 0.3 m 5 m 2.5 m

LU932 0.45 m 10 m 5 m

In cases where it is necessary to measure distances shorter than the dead zone, a reﬂector

can be installed as shown in the ﬁgure.

The measured distance will be the addition of the real distance plus the distance between

the transducer and the reﬂector.

It should be avoided that the product reaches the instrument, since accumulations might

form on the transducer, and that would affect the measurement.

4.2 Obstacles in the vessel

The transmitter must be installed so that the ultrasonic beam cannot ﬁnd anything on its

path, as this could lead to unwanted echoes and incorrect measures.

In some cases, inclined reﬂectors can be placed in front of an obstacle, so that the beam in

this region is diverted and the reﬂected signal does not return to the instrument.

4.3 Filling entries

It is not recommended to install the level transmitter in the upper zone of a ﬁlling entry,

because the instrument could detect the level of the jet ﬁlling instead of the level of the

stored product.

4.4 Foams

Some liquids generate foams when in movement. In vessels with agitators, or in the ﬁlling

processes, important layers can be generated that weaken the reﬂected signal which is

essential for measuring the level.

In a lot of cases the problem of the foam and wave turbulences can be solved by putting a

standpipe.

4.5 Standpipe measurement

It can be appropriated in cases of waves or foam. It is based on placing a tube in the tank so

that the instrument measures the level inside the tube.

The length of the tube depends on the distance that you want to measure, or the minimum

level desired.

The diameter of the tube should be bigger than the threaded connection size of the

instrument (> 2 inches or 50 mm for the LU912 and > 2 1/2" or 65 mm for the LU932).

The standpipe should incorporate a drill top vent grilled hole with a diameter between 5 and

10 mm.

If the standpipe is composed of several sections, it is necessary that the inner wall is free

from defects (welding, edges, etc.) that could be interpreted as a false measurement. In the

same way, if the product is susceptible to leaving adherences or inlaid inside the tube, these

can lead to false readings.

4.6 Temperature

In outdoor installations, the measurement margins can be reduced due to environmental

conditions such as rain or wind, since the ultrasonic signal that travels through the air can be

affected.

It is also recommended to install a protection to avoid direct sunlight on the level transmitter.

The maximum working temperatures are indicated on page 41.

5 ELECTRICAL CONNECTION

For the electrical connection, the LU level transmitter is provided of terminal strips. To help in

the wiring of the equipment, the description of the terminals is marked next to each terminal

strip.

For the electrical installation it is recommended to use multiple conductor cables with

individual cable sections in the order of 0.25 to 0.5 mm2in order to make it easier to

connect.

Before starting the installation, check that the cable glands are the right size for the cables to

be used, this will guarantee the instrument will stay watertight. The M16 x 1.5 cable glands

used are for cables with outer diameters between 5 mm and 12 mm.

To connect the cables, peel the outer insulation to free the inner cables. Then pass the

cables through the cable glands and screw down in the corresponding positions of the

terminal strip as indicated in the following point.

Grip carefully the cables with the cable glands to maintain the ingress protection.

Incorrect installation of the cable gland or inadequate cable placement can cause

unrepairable damage to the converter.

5.1 Power supply and analog output wiring

Before starting the installation of the equipment, check that the supply voltage available is

the same as marked on the label of the level transmitter.

Models LU912 and LU932 are two-wire instruments, that is, the equipment is powered

through the current loop.

The positive terminal of the power supply is connected to the position + and the positive

terminal of the load to the position -. The negative terminals of the power supply and the

load are connected together.

Since it is a 2-wire instrument, the supply and signal line is the same. It is recommended to

use a twisted pair wiring or shielded cable to avoid interferences in the current loop.

It is recommended to use a load with a resistance lower than 700 Ω to guarantee a good

performance.

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