Jesco GW 702 Manuale utente

GW 702

Gas Warning Device for Chlorine Gas, Chlorine Dioxide and Ozone

EN 02 Operating Manual

Read this operating manual before using the equipment.

To be retained for future reference.

Dosing Liquids

Conveying Gases

Control Systems

2 | Operating Manual GW 702 | Table of Contents

Table of Contents

1. General and Safety Instructions................................................................................................................................3

2. Before start-up...........................................................................................................................................................5

2.1 Proper intended use .......................................................................................................................................... 5

2.2 Scope of delivery ............................................................................................................................................... 5

2.3 Start-up procedure ............................................................................................................................................ 5

2.4 Part numbers .................................................................................................................................................... 5

3. Functional range........................................................................................................................................................6

3.1 Measurement ampliﬁer GW 702......................................................................................................................... 6

3.2 Sensor.............................................................................................................................................................. 6

3.3 Power supply backup system (accessory)............................................................................................................ 6

4. Dimensioned drawings..............................................................................................................................................7

5. Technical data............................................................................................................................................................8

6. Assembly and Installation.......................................................................................................................................11

6.1 Measurement ampliﬁer GW 702....................................................................................................................... 11

6.2 Sensor............................................................................................................................................................ 12

6.3 Wiring diagram................................................................................................................................................ 13

6.4 Drill template................................................................................................................................................... 14

7. Operation..................................................................................................................................................................15

7.1 Setting parameters .......................................................................................................................................... 15

7.2 Menu Overview ............................................................................................................................................... 16

7.3. Code.............................................................................................................................................................. 16

7.4 Language........................................................................................................................................................ 16

8. Conﬁguration ...........................................................................................................................................................17

8.1 Sensors .......................................................................................................................................................... 17

8.2 Sensor Slope................................................................................................................................................... 18

8.3 Sensor Test ..................................................................................................................................................... 18

9. Operating Modes......................................................................................................................................................19

10. Relays.....................................................................................................................................................................20

10.1 Action in the event of an alarm or fault............................................................................................................ 20

10.2 Conﬁguration................................................................................................................................................. 21

10.3 Relay Test ..................................................................................................................................................... 21

11. Analogue Output and Interface .............................................................................................................................22

11.1 Analogue output ............................................................................................................................................ 22

11.2 Interface ....................................................................................................................................................... 22

12 Check function........................................................................................................................................................22

13. Maintenance ..........................................................................................................................................................23

13.1 Replacing the sensor ..................................................................................................................................... 23

13.2 Calibrating the sensor.................................................................................................................................... 23

13.3 Functional test of the sensor with test gas application...................................................................................... 24

13.4 Replacing the fuse......................................................................................................................................... 24

13.5 Display Contrast ............................................................................................................................................ 24

13.6 Power supply backup system (accessory)........................................................................................................ 24

13.7 Disposal........................................................................................................................................................ 24

14. Service ...................................................................................................................................................................25

15. Spare parts.............................................................................................................................................................26

Device revision ............................................................................................................................................................26

Index.............................................................................................................................................................................27

Warranty claim.............................................................................................................................................................28

CE declaration of conformity......................................................................................................................................29

General and Safety Instructions | Operating Manual GW 702 | 3

1. General and Safety Instructions

1.1 General

This operating manual contains basic instructions to be followed during installation, operation and main-

tenance. It is therefore essential that the Operating Manual be read by the installation technician before

installing and commissioning the pump/system, as well as by the relevant operating personnel/operating

company of the unit. The Operating Manual must remain accessible at the dosing pump/system for refer-

ence at all times. Besides the general safety instructions in this "Safety" section, the special safety instruc-

tions in the other sections are also to be followed.

1.2 Identiﬁcation of safety instructions in the operating manual

This operating manual contains essential safety instructions. Failure to observe this information may endan-

ger other people and the unit. The safety instructions are identiﬁed by the following symbols:

WARNING!

Refers to a potentially hazardous situation. Failure to follow this instruction may lead to death or severe

injury.

CAUTION!

Refers to a potentially hazardous situation. Failure to follow this instruction may lead to minor injury or dam-

age to property.

ATTENTION! or NOTICE!

Failure to comply with this safety instruction may result in damage to the device and endanger its operation.

IMPORTANT!

This refers to additional information to facilitate operation and ensure the smooth running of the equipment.

Notices attached directly to the unit, such as e.g. cable markings must deﬁnitely be observed and kept in

completely legible condition.

1.3 Personnel qualiﬁcations and training

The personnel employed for operation, maintenance, inspection, and installation must be suitably qualiﬁed

for this work. The responsibilities, areas of competence and personnel supervision must be clearly deﬁned

by the operating company. Personnel who do not have the required know-how must be duly trained and

instructed. If necessary, this can also be done by the manufacturer/supplier on behalf of the operating

company. In addition, the operating company must also ensure that the relevant personnel are fully familiar

with and have understood the contents of the operating manual.

1.4 Important safety instructions

Basic safety precautions should always be followed when installing and using this electrical equipment.

These include the following:

READ AND FOLLOW ALL INSTRUCTIONS!

WARNING!

To reduce the risk of injury, do not permit children to use this product unless they are closely supervised at

all times.

WARNING!

Risk of electric shock. Connect the device only to a SCHUKO socket outlet protected by a ground fault circuit

interrupter (GFCI). Contact a qualiﬁed electrician if you cannot verify that the connector is protected by a

GFCI.

4 | Operating Manual GW 702 | General and Safety Instructions

Do not bury the cable. Secure the cable to avoid damage by lawn mowers, hedge trimmers and other equip-

ment.

WARNING!

To reduce the risk of electric shock, replace the cable immediately if damaged.

WARNING!

To reduce the risk of electric shock, do not use an extension cable to connect the device to the power sup-

ply; use an appropriately located socket.

KEEP THESE INSTRUCTIONS IN A SAFE PLACE!

1.5 Hazards due to failure to follow safety instructions

Failure to follow the safety instructions may endanger not only persons, but also the environment and the

device. Failure to follow the safety instructions may invalidate any damage claims.

Non-compliance with the safety instructions may give rise to the following hazards:

• Failure of major functions of the device.

• Danger to persons due to electrical, mechanical and chemical effects.

1.6 Safety awareness at work

The safety instructions contained in this operating manual must be observed. The operating company is

responsible for ensuring compliance with local safety regulations. Any faults that could affect safety must be

rectiﬁed immediately.

1.7 Safety instructions for the operating company/operator

A safe and ecologically beneﬁcial disposal of process materials as well as replacement parts must be

ensured. (Legal requirements must be observed)

Risks from electric power must be excluded (for further details, refer to the VDE1) regulations and the

requirements of the local public utilities as well as section 1.4).

1) VDE = Association of German Electrical Engineers

1.8 Safety instructions for inspection, maintenance and installation work

The operating company must ensure that all maintenance, inspection and installation work is carried out by

authorised and duly qualiﬁed personnel, who have read and understood this operating manual.

Before carrying out installation and maintenance works, always make sure that the unit is disconnected

from power supply. The device must be prevented from being switched on again during the above work.

Only in this state may additional modules be mounted or removed and connections be made. Non-compli-

ance can result in damage to the unit and invalidate the warranty. All safety and protective equipment must

be reattached and activated immediately after the work has been completed.

1.9 Unauthorised modiﬁcation and production of spare parts

The device may only be modiﬁed or converted in consultation with the manufacturer. If errors and hazards

result during operation due to incorrect conﬁguration of the unit, any liability is excluded.

Use only the manufacturer's spare parts and sensors. Otherwise the warranty is invalidated.

Before start-up | Operating Manual GW 702 | 5

2. Before start-up

2.1 Proper intended use

The device is intended for the following purpose only: monitoring and displaying combustible and/or toxic

gases as well as oxygen. Operating safety is guaranteed only if the device is used for its intended purpose.

All other types of use are prohibited and will invalidate the warranty. The operating conditions described in

chapter 5 "Technical Data" must be observed!

2.2 Scope of delivery

IMPORTANT!

Carefully unpack the product and any accompanying accessories, so that no small parts are left inside the

packaging. Compare the delivery content with the delivery note immediately. If there are any discrepancies,

determine the cause.

The scope of delivery includes:

• Measurement ampliﬁer GW 702

• 1 or 2 sensor elements (depending on version)

• 1 or 2 sensor holders, incl. 10 m cable (depending on version)

• 2 or 4 pipe clamps d25 (depending on version)

• Operating Manual

2.3 Start-up procedure

• Reading the operating manual

• Assembly and installation (section 6)

• Checking the function (see chapter „12 Check function“ on page 22).

2.4 Part numbers

Part No. Description

23600250 Gas warning device GW 702 for chlorine gas, 1 sensor

23600251 Gas warning device GW 702 for chlorine gas, 2 sensors

23600252 Gas warning device GW 702 for chlorine dioxide, 1 sensor

23600253 Gas warning device GW 702 for chlorine dioxide, 2 sensors

23600254 Gas warning device GW 702 for ozone, 1 sensor

23600255 Gas warning device GW 702 for ozone, 2 sensors

6 | Operating Manual GW 702 | Functional range

3. Functional range

The gas warning device is a stationary measuring, control and warning device that is in continuous opera-

tion and is used to measure toxic gases. It consists of several components that act as a single unit. It is both

reliable and easy to assemble and maintain.

The gas warning device is part of the safety system for gas conducting systems and can be used with the

following gases:

Measuring gas

Chlorine gas (Cl2)

Chlorine dioxide (ClO2)

Ozone (O3)

Table 3.1: Measuring gas, other gases on request

Case of application: Chlorine Gas

The sensor is installed in the chlorine gas room; at a freely accessible location approx. 30 cm above the

ﬂoor. Chlorine gas is heavier than air and descends when it escapes. The sensor detects escaped chlorine

gas. The changed electrical behaviour of the sensor is registered by the measurement ampliﬁer. On the

measurement ampliﬁer this is indicated as chlorine content in the air. If the alarm thresholds set have been

exceeded, alarm conditions are displayed or relays switched to notify the relevant persons.

3.1 Measurement ampliﬁer GW 702

The measurement ampliﬁer GW 702 is the central control unit and is installed where it can be accessed by

operators. It allows measurements to be checked and alarm thresholds set.

It evaluates the electrical behaviour of the sensor. The digital display shows the gas content of the air in the

monitored room.

The conﬁguration of the measurement ampliﬁer is possible without sensor connected.

3.2 Sensor

The sensor consists of

• Sensor holder with 10 m cable

• Sensor element

It has a robust and corrosion-proof housing for industrial applications.

IMPORTANT!

The length of the cable must neither be extended nor shortened.

The sensor is an electronic measuring cell that works according to the electro-chemical principle. The sen-

sor element on the sensor holder can be replaced easily.

3.3 Power supply backup system (accessory)

The backup system is a uninterruptible power supply (battery) that feeds the gas warning device system in

the event of a power failure. This supply will keep the device working for approximately 10 hours.

Dimensioned drawings | Operating Manual GW 702 | 7

4. Dimensioned drawings

Fig. 4.1: Measurement ampliﬁer GW 702

Fig. 4.2: Sensor holder

380

210

Fig. 4.3: Power supply backup system (accessory)

8 | Operating Manual GW 702 | Technical data

5. Technical data

Measurement ampliﬁer GW 702

Supply voltage 230 V AC +6/-10 %, 50/60 Hz

alternatively 110 V AC, 50/60 Hz

Power consumption 10 VA

Fuse 230 V: T(S) 63 mA, 5 x 20 mm

110 V: T(S) 125 mA, 5 x 20 mm

Display LCD display

• 2 x 16 characters, lit

• Display of measured value, switching states of relays, status information

of sensor and alarm

• Menu language German, English, French and Spanish

Controls Keypad with 5 keys

Relay 3 contacts, 6 A, 250 V AC, potential-free

Max. 550 VA ohmic resistive load (with RC protective circuit, suppression

element)

• Relay 1, ﬁxed assigned sensor 1 and sensor 2

• Relay 2, ﬁxed assigned sensor 1 and sensor 2

• Relay 3 (alarm), freely assignable sensor 1 and / or sensor 2

Analogue output 0/4 … 20 mA, galvanically isolated

max. working resistance 500 Ω

to be assigned sensor 1 or sensor 2

Number of sensors Max. 2

Alarm thresholds 2 limits, pre-conﬁgured, freely adjustable

Chlorine (Cl2) Chlorine dioxide (ClO2) Ozone (O3)

Limit 1 2 ppm 0.2 ppm 0.2 ppm

Limit 2 9.5 ppm 1 ppm 1 ppm

Digital input 1

Interface RS 485 (option)

Signal generator -

Dimensions (W x H x D) 165 x 160 x 80 mm

Installation Wall assembly

Housing material ABS

Protection class IP 65

Weight ~ 1.0 kg

Cable entry point PG connections

3x M12 x 1.5 (cable diameter 3 … 6 mm)

3x M16 x 1.5 (cable diameter 5 … 10 mm)

Connections Spring terminals for cable up to max. 1.5 mm2

Operating temperature 0 … 50 °C

Storage temperature -20 … +65 °C

Air humidity 0 … 90 % rH, non-condensing

Technical data | Operating Manual GW 702 | 9

Sensors

Measuring gas Chlorine (Cl2) Chlorine dioxide (ClO2) Ozone (O3)

Measuring range 0 … 9.99 ppm 0 … 1 ppm 0 … 1 ppm

Measuring principle Electro-chemical cell. Two or more electrodes arranged in an electrolyte.

An electro-chemical reaction takes place at the electrode. The sensor

supplies a measuring current, which is proportional to the corresponding

gas concentration in the air. In the measurement ampliﬁer this current

is calculated with the corresponding sensor slope and displayed as

measured value in ppm.

Reaction time approx. 30 s

Dimensions (L x ø) 135 x ø 33 mm

Housing material PVC

Protection class IP 54 (except for gas inlet)

Weight approx. 0.2 kg

Cable 10 m

Ambient temperature -10 … +40 °C

Storage temperature -10 … +40 °C

Air humidity 10 … 90 % rH, non-condensing

Air pressure 900 … 1100 hPa

Service life 2 years, depending on the operating conditions

10 | Operating Manual GW 702 | Technical data

Power supply backup system (accessory)

Override time max. 10 h

Changeover time 2 … 6 ms

Power supply 220 / 230 / 240 V AC, 50/60 Hz

Mains output supply 230 V AC ±10%, 50/60 ±1 Hz

Output rated current 2.2 A

Protection • Overload

• Full discharge

• Short circuit

• Overtemperature

Charge time 8 h

Battery 12 V DC, 7 Ah, maintenance-free, 3 … 5 years service life

Interface USB, RS 232

Ambient temperature 0 … 45 °C

Storage temperature 0 … 45 °C

Air humidity 0 … 90 % rH, non-condensing

Housing Steel sheet, powder-coated, lockable

Dimensions (W x H x D) 380 x 380 x 210 mm

Protection class IP 66

Weight approx. 18 kg

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