Hach US9001 ユーザーマニュアル

DOC026.97.80353

US9001/US9003

08/2017, Edition 2

User Manual

Manuel d'utilisation

Manual del usuario

Manual do Usuário

用户手册

取扱説明書

사용 설명서

English..............................................................................................................................3

Français......................................................................................................................... 18

Español.......................................................................................................................... 33

Português...................................................................................................................... 48

中文................................................................................................................................. 63

日本語............................................................................................................................. 78

한글................................................................................................................................. 93

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Table of contents

Specifications on page 3 Maintenance on page 15

General information on page 3 Troubleshooting on page 15

Installation on page 6 Replacement parts and accessories on page 16

Specifications

Specifications are subject to change without notice.

Specification Details

Dimensions (∅ x L) US9001: ∅ 3.02 x 10.31 cm (∅ 1.19 x 4.06 in.)

US9003: ∅ 4.06 x 28.04 cm (∅ 1.6 x 11.04 in.)

Enclosure US9001: 316 stainless steel

US9003: 316 stainless steel and ABS

Weight US9001: 0.76 kg (1.68 lb) with 9.14 m (30 ft) cable

US9003: 0.92 kg (2.03 lb) with 9.14 m (30 ft) cable

Frequency 120 kHz

Accuracy 0.008 in./in. from the calibration point at steady state temperature, still air and ideal

target

Measurement range US9001: 13.34 to 396.24 cm (5.25 to 156 in.)

US9003: 0 to 382.91 cm (0.00 to 150.75 in.)

Power requirements 12 VDC, 0.0416 A, 0.5 W

Operating temperature –18 to 60 °C (0 to 140 °F)

Operating humidity 0 to 95%, non-condensing

Storage temperature –40 to 60 °C (–40 to 140 °F)

Resolution 2.54 mm (0.01 in.)

Cable jacket material Polyurethane

Cable diameter 6.10 mm (0.24 in.)

Cable length 9.14 m (30 ft)

Note: 91.44 m (300 ft) maximum

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Beam angle 6 ° (half angle, typical)

Enclosure rating NEMA 6P, IP 68

Compatible instruments FL series flow loggers and AS950 samplers

Certifications CE

Warranty 1 year

General information

In no event will the manufacturer be liable for direct, indirect, special, incidental or consequential

damages resulting from any defect or omission in this manual. The manufacturer reserves the right to

1

Refer to Replacement parts and accessories on page 16 for the extension cables and the

conduit extension kit.

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make changes in this manual and the products it describes at any time, without notice or obligation.

Revised editions are found on the manufacturer’s website.

Safety information

N O T I C E

The manufacturer is not responsible for any damages due to misapplication or misuse of this product including,

without limitation, direct, incidental and consequential damages, and disclaims such damages to the full extent

permitted under applicable law. The user is solely responsible to identify critical application risks and install

appropriate mechanisms to protect processes during a possible equipment malfunction.

Please read this entire manual before unpacking, setting up or operating this equipment. Pay

attention to all danger and caution statements. Failure to do so could result in serious injury to the

operator or damage to the equipment.

Make sure that the protection provided by this equipment is not impaired. Do not use or install this

equipment in any manner other than that specified in this manual.

Use of hazard information

D A N G E R

Indicates a potentially or imminently hazardous situation which, if not avoided, will result in death or serious injury.

W A R N I N G

Indicates a potentially or imminently hazardous situation which, if not avoided, could result in death or serious

injury.

C A U T I O N

Indicates a potentially hazardous situation that may result in minor or moderate injury.

N O T I C E

Indicates a situation which, if not avoided, may cause damage to the instrument. Information that requires special

emphasis.

Precautionary labels

Read all labels and tags attached to the instrument. Personal injury or damage to the instrument

could occur if not observed. A symbol on the instrument is referenced in the manual with a

precautionary statement.

This symbol, if noted on the instrument, references the instruction manual for operation and/or safety

information.

Electrical equipment marked with this symbol may not be disposed of in European domestic or public

disposal systems. Return old or end-of-life equipment to the manufacturer for disposal at no charge to

the user.

Certification

Canadian Radio Interference-Causing Equipment Regulation, IECS-003, Class A:

Supporting test records reside with the manufacturer.

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing

Equipment Regulations.

Cet appareil numérique de classe A répond à toutes les exigences de la réglementation canadienne

sur les équipements provoquant des interférences.

FCC Part 15, Class "A" Limits

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English

Supporting test records reside with the manufacturer. The device complies with Part 15 of the FCC

Rules. Operation is subject to the following conditions:

1. The equipment may not cause harmful interference.

2. The equipment must accept any interference received, including interference that may cause

undesired operation.

Changes or modifications to this equipment not expressly approved by the party responsible for

compliance could void the user's authority to operate the equipment. This equipment has been tested

and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules.

These limits are designed to provide reasonable protection against harmful interference when the

equipment is operated in a commercial environment. This equipment generates, uses and can

radiate radio frequency energy and, if not installed and used in accordance with the instruction

manual, may cause harmful interference to radio communications. Operation of this equipment in a

residential area is likely to cause harmful interference, in which case the user will be required to

correct the interference at their expense. The following techniques can be used to reduce

interference problems:

1. Disconnect the equipment from its power source to verify that it is or is not the source of the

interference.

2. If the equipment is connected to the same outlet as the device experiencing interference, connect

the equipment to a different outlet.

3. Move the equipment away from the device receiving the interference.

4. Reposition the receiving antenna for the device receiving the interference.

5. Try combinations of the above.

Product overview

The ultrasonic level sensors measure the flow level and calculate the flow rate in open channels. The

flow rate is calculated based on the flow level and the primary device or the flow level and the

velocity supplied by a velocity sensor.

Status indicator light

When the sensor is connected to a flow logger and taking a reading, the status indicator light of the

sensor is on. Refer to Figure 1 on page 6 and Figure 2 on page 6. Refer to Table 1 for the light

color descriptions.

Table 1 Status indicator definitions

Light color Description

Red No echo is found (echo loss).

Green Echo is found.

Flashing green The measurement target is too near the sensor (within 6.35 mm (0.25 in.) of the sensor

minimum distance).

Theory of operation

The flow level is measured by the ultrasonic sensor. The ultrasonic sensor makes a pulsed

ultrasound wave which is sent towards the water surface. The ultrasound wave reflects off of the

water surface and the echo is received back by the sensor. The distance is the measured time it

takes for the ultrasound wave pulse to go from the water surface to the sensor. The measured time is

multiplied by the speed of sound at the ambient temperature of the air below the sensor. The sensor

measures the ambient temperature for accuracy.

Product components

Make sure that all components have been received. Refer to Figure 1 and Figure 2. If any items are

missing or damaged, contact the manufacturer or a sales representative immediately.

English

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Figure 1 US9001 (downlooking) sensor components

1 US9001 sensor with cable, 9.14 m (30 ft) 4 Bare-wire connection

2

2 Status indicator light 5 Gasket, vibration isolation (2x)

3

3 Connector 6 Hex nut (2x)

3

Figure 2 US9003 (in-pipe) sensor components

1 US9003 sensor with cable, 9.14 m (30 ft) 4 Bare-wire connection

2

2 Status indicator light 5 Bubble level

3 Connector

Installation

C A U T I O N

Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the

document.

Site installation guidelines

For the best sensor performance, obey the site installation guidelines in Table 2.

2

Bare-wire is an alternative to the connector.

3

For use with the wall mount bracket (2974) for the downlooking sensor

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Table 2 Site installation guidelines

Guideline Details

Do not hang the sensor by the sensor cable. The sensor cable may stretch and cause measurement

errors.

Prevent the sun from shining directly on the sensor. Intense, direct sunlight on the sensor will increase the

temperature of the sensor housing higher than the ambient

air temperature. This can cause inaccurate measurements.

For the US9001 (downlooking) sensor, make sure

that the lowest mounting nut is more than 6.4 mm

(0.25 in.) from the sensor face. Refer to Figure 3.

If the mounting nut is near the sensor face, level spikes

can occur at extreme temperatures.

Hand tighten the hex nut, then tighten ½ turn. Do not

overtighten the hex nut or the isolation gasket will not

decrease vibrations.

Prevent strong winds and air currents from blowing

directly under the sensor.

The strength of the ultrasonic signal is decreased by the

wind.

Install the sensor so that the ultrasonic signal does

not hit the sides of a small pipe or narrow

flumes/channels.

The ultrasonic signal emits a half beam angle of 6 °. Refer

to Figure 4 and Figure 5. Set the minimum and maximum

distance for the measurement target to prevent false

echoes and incorrect level measurements. Refer to the

FSDATA Desktop documentation to change the application

settings.

Install the sensor sufficiently high above the surface

of the water so that it does not go under the water

when the level increases.

The speed of sound in water is much faster than in air. A

sensor that is under the water will give unusual values.

Figure 3 US9001 (downlooking) sensor

1 Hex nut 2 Gasket, vibration isolation

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Figure 4 US9001 sensor installation

1 Maximum distance 2 Minimum distance

Figure 5 US9003 sensor installation

1 Minimum distance to reflecting obstruction 2 Distance from sensor, 0 to 382.91 cm (0.00 to

150.75 in.) maximum

Installation setup

From the bottom of the sensor, the ultrasonic signal expands as it moves away from the sensor.

Install the sensor so that the ultrasonic signal does not hit the walls of the pipe or the top of the

channel.

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English

When the installation is above a narrow channel, do not install the sensor too high because the beam

may be wider than the channel. This can cause false echoes from the tops of the channel walls

rather than from the water surface. To prevent false echoes, find the applicable sensor height so that

the entire beam falls within the channel and does not hit any obstructions.

Select the applicable sensor height:

1. Take the measurements. Refer to Figure 6.

2. Calculate the angle from the axis, Θ = arc tan × (D2/D1) ≈ 80.5 × (D2/D1).

3. To avoid interference from outside obstructions, make sure that the calculated angle from the axis

is less than the half beam angle (6 ° typical) of the sensor.

Figure 6 Sensor height selection

Install the sensor

Install the ultrasonic sensor so that it is over the center of the flow stream and the sensor face is

parallel with the flow. The sensor face should be parallel with the flow, so that the signal is

perpendicular to the flow and the signal echo does not bounce off the channel walls. The signal

bouncing off the wall may cause erratic readings or a complete echo loss.

The ultrasonic sensor has several mounting hardware options. Refer to Figure 7 and Figure 8. Refer

to the instructions supplied with the mounting hardware for installation information.

English

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Figure 7 Mounting hardware options – US9001

Figure 8 Mounting hardware options – US9003

Connect to a flow logger or sampler

Connect the cable to a flow logger or sampler. Refer to the flow logger or sampler documentation for

instructions.

Install the sensor with a primary device

A primary device is a hydraulic structure, such as a flume or weir, that has a known level-to-flow

relationship. The ultrasonic sensor measures the level of liquid in a channel that contributes to flow

(referred to as the "head") and the flow logger calculates the flow rate based on the head-to-flow

relationship of the primary device.

Note: As an alternative, the flow logger can calculate the flow rate based on the level of liquid in the channel and

the area velocity supplied by a velocity sensor. The flow rate calculation method is selected in the Flow Method

field.

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English

Most primary devices have a specific place for the head (liquid level) measurement sensor. Refer to

the instructions supplied by the primary device manufacturer for the correct sensor location. When

instructions are not available from the primary device manufacturer, refer to Figure 9–Figure 13. The

symbol in the figures identifies the correct sensor location.

To prevent the sensor from going under water but still have the sensor at the best distance, mount

the sensor at the minimum range of the sensor above the typical maximum level of the target. Make

sure to be within the maximum range of the sensor and take the minimum level of the target into

consideration.

Figure 9 V-notch weir

English 11

Figure 10 Palmer-Bowlus Flumes

Figure 11 Parshall Flumes

1 Stilling well

4

If present, install the sensor in the stilling well. If not, install the sensor in the other location

shown.

12 English

Figure 12 Leopold-Lagco Flume

Figure 13 H Flume

Install for a redundant level measurement

The ultrasonic sensors can be used for redundant level measurement, such as with a Sigma area

velocity sensor and AV9000 analyzer module, Flo-Dar sensor or Flo-Tote sensor.

The most common example of a redundant level measurement is with the submerged pressure area

velocity sensor. The area velocity sensor is typically installed at the base of the pipe on a spring band

or scissor band. The ultrasonic sensor is installed at the crown of the pipe. The two sensors are

connected to a FL series flow logger or AS950 sampler. Refer to Figure 14.

English

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Figure 14 Level measurement

1 Area velocity sensor 4 AS950 sampler

2 Ultrasonic sensor 5 FL900 flow logger

3 FL1500 flow logger

Operation

For sensors connected to an FL900 flow logger, connect a computer with FSDATA Desktop software

to the flow logger to configure, calibrate and collect data from the sensors. Refer to the FSDATA

Desktop documentation to configure, calibrate and collect data from the sensor.

For sensors connected to an FL1500 flow logger, refer to the FL1500 flow logger documentation to

configure, calibrate and collect data from the sensors. As an alternative, connect a computer with

FSDATA Desktop software to the flow logger to configure, calibrate and collect data from the

sensors. Refer to the FSDATA Desktop documentation to configure, calibrate and collect data from

the sensor.

For sensors connected to an AS950 sampler, refer to the AS950 sampler documentation to

configure, calibrate and collect data from the sensors.

Install the software

Make sure that the latest version of the FSDATA Desktop software is installed on the computer.

Download the software from http://www.hachflow.com. Click Support, then select Software

Downloads>Hach FL Series Flow Logger.

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English

Maintenance

C A U T I O N

Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the

document.

N O T I C E

Do not disassemble the instrument for maintenance. If the internal components must be cleaned or repaired,

contact the manufacturer.

Clean the sensor

N O T I C E

Do not use steel wool or abrasive pads to clean the sensor or sensor damage will occur.

Examine the sensor periodically for unwanted material and deposits. Clean the sensor when there is

a buildup of deposits or when performance has decreased. Table 3 shows the cleaning solutions to

use and not to use.

Table 3 List of cleaning solutions

Use Do not use

Dish detergent and water

Products that contain ammonia

Concentrated bleach

Kerosene

Gasoline

Aromatic hydrocarbons

1. Disconnect the sensor from the flow logger.

2. Soak the sensor in dish detergent and water.

3. Clean the sensor face and reflector.

4. Use a spray bottle or squeeze bottle to remove heavier unwanted material.

Troubleshooting

Problem Possible cause Solution

Echo loss Foam or condensing moisture (steam

or fog) which absorbs the ultrasonic

signal

Install the sensor in a location with no foam or

condensing moisture.

High wind such as air currents in a

closed high velocity sewer system or

wind gusts during a storm

Keep wind away from the sensor. Contact

technical support for ideas for specific

environments.

The sensor face is not parallel with the

surface of the measurement target.

Make sure that the sensor face is parallel with the

surface of the measurement target.

The surface of the measurement

target is not good (extreme

turbulence).

Select a different area to measure the target.

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Problem Possible cause Solution

Inaccurate

measurements

The pipe or channel where the sensor

is installed is small or too narrow. The

ultrasonic signal bounces off the sides

of the pipe or channel.

Install the sensor in a larger diameter pipe or

move the sensor nearer to the water surface.

Keep the downlooking sensor a minimum of

13.34 cm (5.25 in.) from the water surface. Keep

the in-pipe sensor a minimum of 0 cm (0 in.) from

the water surface.

As an alternative, increase the minimum distance

value to a location below the false target that is

affecting measurements.

The sensor is in direct sunlight. Do not let the sun shine directly on the sensor.

Make a sun-shield if an alternative location is not

available. Contact technical support for ideas for

the specific environment.

The temperature of the sensor

environment has changed quickly.

Let the sensor stabilize after large changes in the

temperature of the environment.

The sensor is too far away from the

surface of the measurement target.

Install the sensor near the surface of the

measurement target.

Measurement

failure

Foam, oil, debris and surface

turbulence are affecting the send and

receive signal.

Clean the sensor. Refer to Clean the sensor

on page 15.

Replacement parts and accessories

W A R N I N G

Personal injury hazard. Use of non-approved parts may cause personal injury, damage to the

instrument or equipment malfunction. The replacement parts in this section are approved by the

manufacturer.

Note: Product and Article numbers may vary for some selling regions. Contact the appropriate distributor or refer to

the company website for contact information.

Replacement parts

Description Item no.

Gasket, vibration isolation 6820

Holder (level) for US9003 (in-pipe) sensor 9488700

Accessories

Description Item no.

Extension cable with connectors, 15.24 m (50 ft) 9489000

Extension cable, 82.29 m (270 ft), bare wire one end, cable only 9488100

Extension cable with bare-wire and junction box, 30.48 m (100 ft) 8315200

Extension cable with bare-wire and junction box, 82.29 m (270 ft) 8315201

Extension kit for conduit, includes: 82.29 m (270 ft) cable with bare wires and junction

box with 30.48 cm (12 in.) cable and connector to logger

Note: Order the ultrasonic sensor, dispensing gun, and gel cartridges separately.

9488000

Gel cartridges (3x) with feed tubes, for the junction box (if used) to keep water out 7725600

Gel cartridge, dispensing gun 7715300

16 English

Accessories (continued)

Description Item no.

Junction box with 30.48 cm (12 in.) cable, connector and karabiner clip

Note: Order the dispensing gun and gel cartridges separately.

9488200

Mounting bracket, permanent, for US9003 (in-pipe) sensor 3875

Mounting bracket, floor or wall, adjustable, for US9001 (downlooking) sensor 2904

Mounting bracket, wall, permanent, for US9001 (downlooking) sensor 2974

Mounting clip for US9003 (in-pipe) sensor 3868

Scissor band set for ∅ 38.10 to 106.68 cm (15 to 42 in.) pipe for US9003 (in-pipe)

sensor

3766

Scissor band for ∅ 38.10 cm (15 in.) pipe 9706100

Scissor band for ∅ 45.72 cm (18 in.) pipe 9706200

Scissor band for ∅ 53.34 cm (21 in.) pipe 9706300

Scissor band for ∅ 60.96 cm (24 in.) pipe 9706400

Scissor band for ∅ 68.58 cm (27 in.) pipe 9706500

Scissor band for ∅ 76.20 cm (30 in.) pipe 9706600

Scissor band for ∅ 83.82 cm (33 in.) pipe 9706700

Scissor band for ∅ 91.44 cm (36 in.) pipe 9706800

Scissor band for ∅ 106.68 cm (42 in.) pipe 9706900

Spring ring, ∅ 15.24 cm (6 in.), for US9003 (in-pipe) sensor 4021

Spring ring, ∅ 20.32 cm (8 in.), for US9003 (in-pipe) sensor 4022

Spring ring, ∅ 25.40 cm (10 in.), for US9003 (in-pipe) sensor 4023

Spring ring, ∅ 30.48 cm (12 in.), for US9003 (in-pipe) sensor 4024

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Table des matières

Caractéristiques à la page 18 Maintenance à la page 30

Généralités à la page 18 Dépannage à la page 31

Installation à la page 21 Pièces de rechange et accessoires à la page 31

Caractéristiques

Les caractéristiques techniques peuvent être modifiées sans préavis.

Caractéristique Détails

Dimensions (∅ x L) US9001 : ∅ 3,02 x 10,31 cm (∅ 1,19 x 4,06 po)

US9003 : ∅ 4,06 x 28,04 cm (∅ 1,6 x 11,04 po)

Boîtier US9001 : 316 acier inoxydable

US9003 : 316 acier inoxydable et ABS

Poids US9001 : 0,76 kg (1,68 lb) avec câble de 9,14 m (30 pieds)

US9003 : 0,92 kg (2,03 lb) avec câble de 9,14 m (30 pieds)

Fréquence 120 kHz

Précision 0,008 pouces (30 cm) /po. depuis le point d'étalonnage à température

constante, sans vent et cible parfaite

Plage de mesure US9001 : 13,34 à 396,24 cm (5,25 to 156 po.)

US9003 : 0 à 382,91 cm (0 à 150,75 po.)

Alimentation requise 12 V CC, 0,0416 A, 0,5 W

Température de fonctionnement –18 à 60 °C (0 à 140 °F)

Humidité de fonctionnement 0 à 95 %, sans condensation

Température de stockage –40 à 60 °C (–40 à 140 °F)

Résolution 2,54 mm (0,01 po)

Matériel de la gaine du câble Polyuréthane

Diamètre du câble 6,10 mm (0,24 po)

Longueur du câble 9,14 m (30 pieds)

Remarque : 91,44 m (300 pieds) maximum

1

Angle du faisceau 6° (demi-angle, typique)

Indice de protection NEMA 6P, IP 68

Instruments compatibles Enregistreurs de débit de la série FL et échantillonneurs AS950

Certifications CE

Garantie 1 an

Généralités

En aucun cas le constructeur ne saurait être responsable des dommages directs, indirects, spéciaux,

accessoires ou consécutifs résultant d'un défaut ou d'une omission dans ce manuel. Le constructeur

1

Reportez-vous à la section Pièces de rechange et accessoires à la page 31 pour obtenir des

informations sur les câbles d'extension et le kit d'extension de conduit.

18 Français

se réserve le droit d'apporter des modifications à ce manuel et aux produits décrits à tout moment,

sans avertissement ni obligation. Les éditions révisées se trouvent sur le site Internet du fabricant.

Consignes de sécurité

A V I S

Le fabricant décline toute responsabilité quant aux dégâts liés à une application ou un usage inappropriés de ce

produit, y compris, sans toutefois s'y limiter, des dommages directs ou indirects, ainsi que des dommages

consécutifs, et rejette toute responsabilité quant à ces dommages dans la mesure où la loi applicable le permet.

L'utilisateur est seul responsable de la vérification des risques d'application critiques et de la mise en place de

mécanismes de protection des processus en cas de défaillance de l'équipement.

Veuillez lire l'ensemble du manuel avant le déballage, la configuration ou la mise en fonctionnement

de cet appareil. Respectez toutes les déclarations de prudence et d'attention. Le non-respect de

cette procédure peut conduire à des blessures graves de l'opérateur ou à des dégâts sur le matériel.

Assurez-vous que la protection fournie avec cet appareil n'est pas défaillante. N'utilisez ni n'installez

cet appareil d'une façon différente de celle décrite dans ce manuel.

Interprétation des indications de risques

D A N G E R

Indique une situation de danger potentiel ou imminent qui, si elle n'est pas évitée, entraîne des blessures graves,

voire mortelles.

A V E R T I S S E M E N T

Indique une situation de danger potentiel ou imminent qui, si elle n'est pas évitée, peut entraîner des blessures

graves, voire mortelles.

A T T E N T I O N

Indique une situation de danger potentiel qui peut entraîner des blessures mineures ou légères.

A V I S

Indique une situation qui, si elle n'est pas évitée, peut occasionner l'endommagement du matériel. Informations

nécessitant une attention particulière.

Etiquettes de mise en garde

Lisez toutes les informations et toutes les étiquettes apposées sur l’appareil. Des personnes peuvent

se blesser et le matériel peut être endommagé si ces instructions ne sont pas respectées. Un

symbole sur l'appareil est référencé dans le manuel et accompagné d'une déclaration de mise en

garde.

Si l'appareil comporte ce symbole, reportez-vous au manuel d'utilisation pour consulter les

informations de fonctionnement et de sécurité.

Le matériel électrique portant ce symbole ne doit pas être mis au rebut dans les réseaux domestiques

ou publics européens. Retournez le matériel usé ou en fin de vie au fabricant pour une mise au rebut

sans frais pour l'utilisateur.

Certification

Règlement canadien sur les équipements causant des interférences radio, IECS-003, Classe

A:

Les données d'essai correspondantes sont conservées chez le constructeur.

Cet appareil numérique de classe A respecte toutes les exigences du Règlement sur le matériel

brouilleur du Canada.

Français

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Cet appareil numérique de classe A répond à toutes les exigences de la réglementation canadienne

sur les équipements provoquant des interférences.

FCC part 15, limites de classe A :

Les données d'essai correspondantes sont conservées chez le constructeur. L'appareil est conforme

à la partie 15 de la règlementation FCC. Le fonctionnement est soumis aux conditions suivantes :

1. Cet équipement ne peut pas causer d'interférence nuisible.

2. Cet équipement doit accepter toutes les interférences reçues, y compris celles qui pourraient

entraîner un fonctionnement inattendu.

Les modifications de cet équipement qui n’ont pas été expressément approuvées par le responsable

de la conformité aux limites pourraient annuler l’autorité dont l’utilisateur dispose pour utiliser cet

équipement. Cet équipement a été testé et déclaré conforme aux limites définies pour les appareils

numériques de classe A, conformément à la section 15 de la réglementation FCC. Ces limites ont

pour but de fournir une protection raisonnable contre les interférences néfastes lorsque l’équipement

fonctionne dans un environnement commercial. Cet équipement génère, utilise et peut irradier

l'énergie des fréquences radio et, s'il n'est pas installé ou utilisé conformément au mode d'emploi, il

peut entraîner des interférences dangereuses pour les communications radio. Le fonctionnement de

cet équipement dans une zone résidentielle risque de causer des interférences nuisibles, dans ce

cas l'utilisateur doit corriger les interférences à ses frais Les techniques ci-dessous peuvent

permettre de réduire les problèmes d'interférences :

1. Débrancher l'équipement de la prise de courant pour vérifier s'il est ou non la source des

perturbations

2. Si l'équipement est branché sur le même circuit de prises que l'appareil qui subit des

interférences, branchez l'équipement sur un circuit différent.

3. Éloigner l'équipement du dispositif qui reçoit l'interférence.

4. Repositionner l’antenne de réception du périphérique qui reçoit les interférences.

5. Essayer plusieurs des techniques ci-dessus à la fois.

Présentation du produit

Les capteurs de niveau à ultrasons mesurent le niveau de débit et calculent le débit dans des canaux

ouverts. Le débit est calculé en fonction du niveau de débit et de l'appareil principal ou du niveau de

débit et de la vitesse fournie par un capteur de vitesse.

Voyant d'état

Lorsque le capteur est connecté à un enregistreur de débit et qu'il prend une mesure, le voyant d'état

du capteur est allumé. Reportez-vous à la Figure 1 à la page 21 et au Figure 2 à la page 21.

Reportez-vous au tableau Tableau 1 pour obtenir les descriptions des couleurs des voyants.

Tableau 1 Définitions des voyants

Couleur Description

Rouge Aucun écho trouvé (perte d'écho).

Vert Echo trouvé.

Vert clignotant La cible de mesure est trop près du capteur – à moins de 6,35 mm (0,25 po) de la distance

minimale du capteur.

Principe de fonctionnement

Le niveau de débit est mesuré par le capteur à ultrasons. Le capteur à ultrasons émet une onde

d'ultrasons pulsée qui est envoyée vers la surface de l'eau. L'onde d'ultrasons rebondit sur la surface

de l'eau et l'écho est reçu par le capteur. La distance correspond au temps que met l'onde

d'ultrasons pulsée pour aller de la surface de l'eau au capteur. Le temps mesuré est multiplié par la

vitesse du son à la température ambiante de l'air sous le capteur. Le capteur mesure la température

ambiante pour une valeur précise.

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