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 maintenance. 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 reference at all times. Besides the general safety instructions in this "Safety" section, the special safety instructions 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 endanger 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 damage 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 equipment.
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 supply; 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 VDE
1)
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-compliance 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 operation 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 (Cl
2
)
Chlorine dioxide (ClO
2
)
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 sensor 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
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 (Cl
2
) 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 mm
2
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
Assembly and Installation | Operating Manual GW 702 | 11
6. Assembly and Installation
ATTENTION!
Electrical connections must only be performed by specialist personnel in accordance with relevant installation requirements.
ATTENTION!
Make sure the device is de-energised when working on it. The power supply must only be switched on after
assembly and electrical connections have been completed.
IMPORTANT!
Note the power supply specified on the rating plate.
IMPORTANT!
Where possible, a continuous cable from sensor to the measuring input should be used. An extension of the
cable by plugs or terminal sockets increases the risk of faults caused by contamination, humidity or excessive transition resistances.
ATTENTION!
Input, output and control lines and cables must always be kept separate. In particular, they must be routed
away from power circuit lines!
NOTE!
All cables must be routed to protect them from mechanical damage. Strain relief must be provided near the
cable entry point.
Stray interference will falsify the measurement. Power supply and measuring lines at close proximity should
only cross at a 90° angle. The permissible length of the measuring cables must be adhered to with regard
to the sensor used. When measuring ensure that the (plug) connections are clean and dry and that the lines
do not become brittle due to sharp buckling. The shielded cables normally used for such measuring lines
must be of the quality specified.
6.1 Measurement amplifier GW 702
The electrical installation for the gas warning device must contain a separating device (e.g. an automatic
circuit breaker) to ensure reliable separation from the power supply.
The device is designed for a fixed installation connected to a power supply of 230 V /AC. The device corresponds to protection class I in accordance with EN 60335 and must be connected to a protective earth
conductor (PE).
When connecting to the relays, note that inductive loads must be dejammed. If this is not possible, the strip
relay contact on the device terminal must be protected by an RC protective circuit / suppression element.
For DC voltage the relays or contactor coil must be dejammed with a freewheeling diode.
RC protective circuit / suppression element
Current Capacitor C Resistor R
< 60 mA 10 nF 260 V 390 Ohm 2 Watt
< 70 mA 47 nF 260 V 22 Ohm 2 Watt
< 150 mA 100 nF 260 V 47 Ohm 2 Watt
< 1 A 220 nF 260 V 47 Ohm 2 Watt
ATTENTION!
The assembly location must be selected so that the device is not subject to any mechanical load or chemical exposure in any way.
12 | Operating Manual GW 702 | Assembly and Installation
• First, remove the terminal cover.
• Prepare three drill holes (max. M5).
• Take into account at the top hole, that you can suspend the device
or push it under.
• To suspend it, set the top hole 120 mm above the two lower
holes.
• To push it under, the distance must be 135 mm.
• In both cases the screw must protrude at least 3 mm.
• Suspend the device on the top screw or push it underneath.
• Fix it with the two lower screws.
• Re-attach the terminal cover or proceed directly to the connections.
6.2 Sensor
• Up to 2 sensors can be connected to the measurement amplifier
GW 702.
• The connection of a sensor takes place by means of the shielded
3-wire cable attached to the sensor holder.
IMPORTANT!
The length of the cable must neither be extended nor shortened.
• All input and output wires and cables must be shielded. The
shielding must be applied on one side only.
• The gas inlet of the sensor must be kept clear of dust and
contamination.
• The wall mounting is carried out with the sensor opening facing
down, close to the ground (at a height of approx. 30 cm).
• During assembly make sure that the sensor remains accessible for
maintenance work.
• Keep a minimum distance of 10 cm between the sensor opening
and other fixtures.
a
Unscrew the O-ring of the sensor holder.
b
Take the sensor element from the separate packaging and remove
the transport protection. (shorting jumper).
c
Fit the sensor element into the sensor holder without force. Note,
that the correct seating position is indicated by a groove. Ensure that the
connecting pins are not bent. Check the correct seating of the seal and
screw on the union nut again.
d
Mount the completed sensor perpendicular with two mounting
brackets, with the sensor element facing down, about 30 cm above the
ground. Ensure that the sensor is not subjected to any strong wind, heat
or direct sunlight and that the sensor element can not get wet at any
time.
a
b
c
d
Assembly and Installation | Operating Manual GW 702 | 13
6.3 Wiring diagram
- + + -
1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 19
20 21 22
23 24 25 26 27 28 29
1. Sens. 2. Sens.
0/4 ... 20
mA
Rel. 1 Rel.2 Rel.3
L N PE
RS 485
Dig.
IN
A
yalpsiD
+ -
10
9
24 V DC
Terminal Connection Note
1 Sensor 1 Shielding
2 green (GN) Measuring electrode
3 brown (BN) Reference electrode
4 white (WH) Counter electrode
5 GND Ground
6 Sensor 2 Shielding
7 green (GN) Measuring electrode
8 brown (BN) Reference electrode
9 white (WH) Counter electrode
10 GND Ground
Display Display contrast Trimmer for adapting the display contrast
11 Analogue output + 0/4 … 20 mA, max. working resistance 500 Ω
12 -
14 / 15 Relay 1 Make contact (N.O.), configurable
16 / 17 Relay 2
18 / 19 Relay 3 (Alarm)
20 … 22 Power supply
23 RS 485 (option) A (-) Interface
24 B (+)
A Jumper plugged = load resistor activated
26 Digital input + Potential-free
27 -
28 24 V DC Output for switch
29 GND Ground
Fig. 6.1: Wiring diagram for measurement amplifier GW 702
14 | Operating Manual GW 702 | Assembly and Installation
6.4 Drill template
Width x height
Measurement amplifier GW 702 151 x 120 + 15 mm
Operation | Operating Manual GW 702 | 15
7. Operation
a
Orientation aid
b
Measured value sensor 1
c
Measured value sensor 2
d
Status display
e
Key left ()
f
Key up ()
g
Key down ()
h
Key right ()
i
"ESC" key
After switching on, the device first indicates the measured values of sensor 1 and if applicable sensor 2. Any
possible alarm messages present are indicated in the second line.
Move in the menu with the help of the operating keys:
With the key you switch from the display of the measured value to the main menu.
With the keys and you scroll up and down.
The key is used to select a menu or a parameter.
The key is used to exit a menu and save data.
For better orientation there are various triangles visible in the display. They are intended to serve as orientation aid and specify, in which direction you can move from your respective position.
The "ESC" key brings you back to the measured value display at any time.
7.1 Setting parameters
1. When selecting a parameter the current setting is displayed.
2. Switch to the next alternative by pressing the key .
3. When you have paged through all alternatives, with a renewed press of the key the original setting
is displayed again.
Selection of alternatives
Often for a parameter you must only select between various alternatives. For this you only need the key
. With that you page from one alternative to the next, until you arrive at the starting point again or have
reached the required alternative.
With these parameters, any change becomes effective immediately. You do not need to save the setting
extra.
1. Select the parameter by pressing the key .
2. A double triangle appears behind the number and indicates, that the number can now be changed with
the keys and .
3. When you have set the required value, save your setting by pressing the key . The double triangle
disappears - the new value is saved.
Enter password
058 Code
Enter password
058 Code
Enter password
062 Code
GW 702
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
e f g h i
a b c d
16 | Operating Manual GW 702 | Operation
Setting numerical parameters
Numerical parameters can basically only be changed when a double triangle is visible behind the number.
This double triangle first becomes visible when one selects the number with the key .
Change the number with the keys and . A short key press increases or decreases the last digit by 1.
If you keep the key pressed longer, the numerical value begins to run and keeps changing until you release
the key.
Save your setting by pressing the key .
The double triangle disappears.
NOTE!
If you do not wish to save, instead of key press the "ESC" key.
7.2 Menu Overview
To switch from the measured value display to the main menu, press the key . Select menu item with key
. Start the menu with key .
Measured value display Main menu Basic settings Service
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
Preselect M1
Preselect M2
Enter password
Sensor test
Basic settings
Service
Sensor 1
Sensor 2
Analogue output
Language
No. of RS 485
Select Alarm
Product Info
Analogue Inputs
Relay Test
Erase Settings
• In the main menu you will find all functions that are used regularly.
• The menu Basic Settings contains the parameters that are set during start-up.
• In the menu Service you will find all functions for service and maintenance.
7.3. Code
Before you can undertake any settings, you must first enter the corresponding password code:
Measured value display Main menu Enter password
Code Access to the parameters in the menus
11 Preselect M1, Preselect M2, Sensor Test
86 Basic Settings, Service
others no access
7.4 Language
There are various languages available for the device. Code 86 is required for the setting.
Measured value display Main menu Basic Settings Language
Presently the languages German, English, French and Spanish are installed.
Configuration | Operating Manual GW 702 | 17
8. Configuration
Measured value display Main menu Preselect M1 / M2 Sensor Info
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
Preselect M1
Preselect M2
Enter password
Sensor test
Basic settings
Service
Sensor Info
Limit value 1
Limit value 2
Turn-on delay
Sensor slope
nA/ppm
Basic settings Sensor 1 / 2
Sensor 1
Sensor 2
Analogue output
Language
No. of RS 485
Select Alarm
Sensors
---------
The GW 702 can be operated with two sensors. When delivered the devices are preset to one or two
sensors. If you subsequently connect a second sensor, you must then activate Sensor 2 in the menu Basic
Settings.
IMPORTANT!
The gas sensors do not need to be calibrated. For the adaptation the slope is printed on the housing of
every sensor. This value is to be set in the main menu.
The function of the sensor is controlled automatically and electronically at specified intervals. In addition a
sensor test can be triggered manually at any time.
8.1 Sensors
Selection options for Sensor 1 and Sensor 2:
Selection Sensor for measuring gas
------ No sensor connected
Chlorine Chlorine gas (Cl
2
)
Chlorine dioxide Chlorine dioxide (ClO
2
)
Ozone Ozone (O
3
)
1. In the menu Basic Settings, select the menu item "Sensor 1". The current sensor type for Sensor 1 is
displayed.
2. Switch to the next alternative by pressing the key . Press the key until you have found the required
sensor type.
3. Exit the menu item with the key or ESC.
To set up Sensor 2 proceed as for Sensor 1.
NOTE!
The menu items "Preselect M2" and "Sensor 2" only appear with Sensor 2 activated. The measured value
display adapts likewise.
18 | Operating Manual GW 702 | Configuration
8.2 Sensor Slope
Every sensor element has the sensor slope printed on the label at works. This is to be adapted in the main
menu.
1. In the main menu, select the menu item "Preselect M1".
2. Select the menu item "Sensor Info". The current slope of the sensor is displayed.
3. Press the key and set the value specified on the sensor element with the help of the keys and
. Confirm with the key .
To set up Sensor 2 proceed as for Sensor 1.
8.3 Sensor Test
Measured value display Main menu Sensor test
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
Preselect M1
Preselect M2
Enter password
Sensor test
Basic settings
Service
Test Interval
h
Basic settings Select Alarm Alarm Sens.Test
Sensor 1
Sensor 2
Analogue output
Language
No. of RS 485
Select Alarm
Alarm Sens.Test
Value 1 Sens. 1
Value 2 Sens. 1
Value 1 Sens. 2
Value 2 Sens. 2
Direction
Alarm Sens.Test
On
Automatic Sensor Test
The device automatically checks electronically the signal of the sensor. The time interval between two successive tests can be specified in hours in the main menu under "Sensor Test".
All switching functions of the sensor are disabled during the approx. 5 sec. test. In the display the message
"Sensor Test" is displayed. If a sensor is electrically faulty or not connected, the error message "Fault Sensor 1" or "Fault Sensor 2" appears.
If you have activated the Alarm Sensor Test in the Basic Settings under "Select Alarm", the alarm relay, relay
3, also switches if the test is unsuccessful.
NOTE!
With a setting of zero hours, "0 h", the function is deactivated.
Manual Sensor Test
In addition a sensor test can be triggered manually at any time.
1. If the device is not in the measured value display, press the key "ESC".
2. Press the key .
3. Press the key to start the sensor test.
NOTE!
The sensor test is not accessible if an alarm is present.
Operating Modes | Operating Manual GW 702 | 19
9. Operating Modes
Operating states of the measurement amplifier GW 702.
Power-up phase
The connected sensor can deliver undefined values to the measurement amplifier GWZ 702 directly after
the system has powered up. This situation can lead to false alarms. All alarm messages are therefore
blocked for approx. 20 seconds after power-up or after a voltage interruption with a start delay.
Data logging
The data logging of the measurement amplifier GW 702 takes place automatically. The status is not indicated in the display. The measured values of the sensors are visible over the menu Service (see section 13).
Sensor test
The device automatically checks electronically the signal of the sensor. The time interval between two successive tests can be specified in hours in the main menu under "Sensor Test". (see section 8.3)
Alarm
Two alarm thresholds can be set, Limit Value 1 and Limit Value 2. When the alarm thresholds are exceeded,
instead of the measured value display the display indicates "Erase Alarm, press key ".
With key the alarm is acknowledged manually and the relay is switched.
20 | Operating Manual GW 702 | Relays
10. Relays
With three relays external devices can be controlled or information can be forwarded.
• Two limit values / alarm thresholds can be set per sensor.
• On reaching limit value 1, of sensor 1 or sensor 2, relay 1 is switched. This is not self-locking and
returns when the level falls below limit 1 again.
• On reaching limit value 2, of sensor 1 or sensor 2, relay 2 is switched. This is self-locking and does not
return when the level falls below limit 2 again.
• Relay 3 (Alarm) can be assigned to all four limit values at the same time: Limit value 1 and 2 of sensor
1 and of sensor 2. In the standard setting the limit values 2 of sensor 1 and sensor 2 are switched on.
The limits are pre-set depending on the model, see table 8.1.
NOTE!
CODE 86 is necessary for changes to the parameters and settings.
Limit Value Chlorine gas Chlorine dioxide Ozone
1 2 ppm 0.2 ppm 0.2 ppm
2 9.5 ppm 1 ppm 1 ppm
Tab. 10.1: Preset limit values for each measuring gas
Relay Limit value Delay time Self-
locking
Acknowledgement Use
Relay 1 1 No delay No Can be manually acknowl-
edged immediately
Optical signal generator
Relay 2 2 Yes Can be acknowledged
immediately externally via
digital input.
Can only be acknowledged
manually when the level falls
below limit 2.
Sprinkler with acknowledgement via door
contact.
Relay 3
"Alarm"
-, 1 or 2
(Standard: 2)
No Can be manually acknowl-
edged immediately
Acoustic signal
generator
Tab. 10.2: GW 702 measurement amplifier relays
Example
If relay 2 activates the sprinkler, and a door contact is connected to the digital input, then in case of alarm
the sprinkler will be switched off as soon as the maintenance personnel enters the room. The display shows
“Door Contact”. If limit value 2 is still exceeded when the door is closed, relay 2 switches again.
10.1 Action in the event of an alarm or fault
Limit value 1
When limit value 1 is exceeded there is a minimum gas concentration present. Appropriate action must be
taken immediately.
CAUTION!
Repair work may only be started when the concentration has dropped below limit value 1.
Limit value 2
When limit value 1 is exceeded the endangered area and all surrounding rooms must be evacuated. The
actions listed in the health and safety regulations and chlorine alarm plans must be taken. If a limit value is
exceeded, the message "Limit value exceeded" appears in the display.
Relays | Operating Manual GW 702 | 21
Instead of the measured value display, the display indicates "Erase Alarm, press key ".
With key the alarm is acknowledged manually and the relay is switched.
NOTE!
Through the manual acknowledgement only the relay is switched. The alarm message is still displayed until
the cause of alarm has been eliminated.
10.2 Configuration
Measured value display Main menu Preselect M1/2 Limit value 1/2
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
Preselect M1
Preselect M2
Enter password
Sensor test
Basic settings
Service
Sensor Info
Limit value 1
Limit value 2
Turn-on delay
Limit value 1
ppm
Basic settings Select Alarm Value 1/2 Sens. 1/2
Sensor 1
Sensor 2
Analogue output
Language
No. of RS 485
Select Alarm
Alarm Sens.Test
Value 1 Sens. 1
Value 2 Sens. 1
Value 1 Sens. 2
Value 2 Sens. 2
Direction
Value 1 Sens. 1
Off
Direction
Direction
Alarm = Rel On
Limit values
Setting under measured value display Main menu Preselect M1/2 Limit value 1/2
Delay per sensor for limit value 2
Fixed delay time between exceeding the limit value and switching the relay.
Setting under measured value display Main menu Preselect M1/2 Limit value 1/2
Relay 3 ("Alarm") allocation
Setting under measured value display Main menu Basic Settings Select Alarm Value 1/2 Sens
1/2
Alarm Sensor Test Allocation
Activation of relay 3 with unsuccessful sensor test under Main Menu Basic Settings Select Alarm
Direction
You determine with the direction, whether relay 3 is normally open (make contact, N.O.) and closes in case
of an alarm or vice versa (break contact, N.C.). In the second case the relay is held active in its normal position. This way an alarm is raised even during a power failure.
10.3 Relay Test
Manual test of the relays under measured value display Service Relay Test Test Rel. 1/2/3
22 | Operating Manual GW 702 | Analogue Output and Interface
11. Analogue Output and Interface
Measured value display Basic settings Analogue output No. of RS 485
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
Sensor 1
Sensor 2
Analogue
output
Language
No. of RS 485
Select Alarm
0/4 mA Select
Output
Sens. 1 or 2
Bus Address
No. 00
11.1 Analogue output
Via the analogue output you can read out the measured values of a sensor, sensor 1 or 2, as 0/4 … 20 mA
signal. With the setting 4 … 20 mA the resolution is indeed lower, but defective cable connections can be
detected immediately.
Measured value display Main Menu Basic Settings Analogue Output
Select between 0 … 20 mA and 4 … 20 mA.
Select between Sensor 1 and Sensor 2.
11.2 Interface
The units are optionally available with an RS 485 interface. This is used for service purposes only.
12 Check function
Perform operational checks of the sensor and alarm threshold limits upon commissioning. The operational
check involves checking the sensor and the amplifier switch points with the gas used.
Perform the following checks:
• Check the sensor using a sensor test.
• Operational check of the switching steps for alarm activation. For this the sensors are to be impinged
on with test gas with a concentration above limit value 2.
• Operational check of the relay contacts.
• Operational check of the optical and acoustic warning devices.
Maintenance | Operating Manual GW 702 | 23
13. Maintenance
Maintenance by a competent person is essential for testing and maintaining the functionality of the system.
Maintenance involves inspection, calibration and adjustment as well as a function test of the entire gas
measuring system.
ATTENTION!
Regular inspection and functional testing must be carried out on the supplied GW 702 measuring, monitoring and warning system at maximum 6-monthly intervals. National regulations or local standards may also
apply.
Proper maintenance is the responsibility of the system's operating company. The results of the maintenance
work should be documented if this is not already required by the prevailing regulations.
NOTE!
Prior to carrying out the functional test ensure that steps have been taken to prevent accidental triggering
and forwarding of alarms.
Check the alarm relays regularly to ensure that in the event of a fault both the device's indicators and the
recording of the higher-level controller (PLC etc.) are working.
Maintenance includes:
• The check of the sensor by means of a sensor test
• Operational check of the switching steps for alarm activation. For this the sensors are to be impinged
on with test gas with a concentration above limit value 2.
• Operational check of the relay contacts
• Operational check of the optical and acoustic warning devices.
13.1 Replacing the sensor
The sensor element in the sensor holder is subject to ageing and wear, the extent of which depends largely
on the prevailing conditions at the place of application. For this reason the sensor element is excluded from
the warranty as a wearing part. The service life of a sensor element is approximately two years. After this
time all sensor elements in operation should be replaced.
It is to be ensured when replacing a sensor element, that the new sensor element is suitable for the application and matches the device settings.
When starting up or exchanging the sensor element, the slope specified on the sensor element is to be set
in the device (see section 8.2). That also applies, if not the sensor element, but rather the measurement
amplifier GW 702 is replaced.
IMPORTANT!
The sensor element must not be used beyond the specified usability date. The sensor elements are to be
stored cool and dry until used.
13.2 Calibrating the sensor
ATTENTION!
The sensor is calibrated at works. Any unqualified changes made to the settings will deactivate operation.
The GW 702 gas warning device is factory-calibrated prior to delivery. If calibration is required, it must only
be performed by authorised specialist personnel.
24 | Operating Manual GW 702 | Maintenance
13.3 Functional test of the sensor with test gas application
• To test the zero point ambient air is used (free of measuring gas, without flammable substances),
otherwise synthetic air.
• Only certified test gases may be used within their shelf life.
• The actual concentration must be known to 2% relative to the bottle value.
• The test gas concentration is in the middle of the measuring range or slightly above the maximum
alarm threshold, at any rate below the measuring range limit.
• Test duration: 0.5 to 1.0 l/min via calibration adapter for at least 2 minutes
• Further information: DIN EN 45544-4, BG Chemical information BGI 836 (bulletin T021). In addition
there are national regulations for determining maintenance intervals.
13.4 Replacing the fuse
The devices are equipped with an internal fuse that can be replaced if required. A spare fuse is included in
the scope of supply. It is located in the terminal cover.
1. To replace the fuse, unscrew and lift up the front of the device. The fuse is located in the lower right
area. It is held in place on with a bayonet catch.
2. Turn the catch anticlockwise, until the fuse jumps out.
3. Replace it with the spare fuse and fix it in place by turning the catch clockwise.
4. Replace the front of the device and screw it firmly.
WARNING!
Ensure that the device is de-energised before opening it.
13.5 Display Contrast
For devices in wall-mounted housing the display contrast can be adapted to the actual lighting conditions by
means of a potentiometer. The potentiometer is marked in the wiring diagram with "Display".
13.6 Power supply backup system (accessory)
The backup system battery is maintenance-free.
13.7 Disposal
The equipment was manufactured in accordance with the ROHS guideline and the waste electrical equipment legislation. The manufacturer will take care of disposal if the equipment is returned free of charge. It
should not be disposed of as domestic waste!
Service | Operating Manual GW 702 | 25
14. Service
Measured value display Main menu Service
0.09 ppm 0.01 ppm
Sens. 1 Sens. 2
Preselect M1
Preselect M2
Enter password
Sensor test
Basic Settings
Service
Product Info
Analogue Inputs
Relay Test
Erase Settings
Measured value display Main Menu Service
In the Service menu you will find information which is especially important for any inquiries, additions,
updates or problems.
Product Info
This data enables an unambiguous identification of the device (Hardware and Software).
Analogue Inputs of the Sensors
Here you see which data the device receives from the sensors. This raw data is not influenced by compensations and calibration and provides important information, when problems arise with measurement or
device operation.
Relay Test
In the menu Relay Test, every relay can be switched off manually.
1. Select the corresponding relay in the menu Relay Test with the keys and .
2. To switch the relay, simultaneously press the keys and . As long as you keep both keys de-
pressed, the relay is switched.
Erase Settings
With this function you can erase all settings performed and restore the original delivery state.
The procedure takes a few seconds. The device then switches back automatically to the measured value
display.
26 | Operating Manual GW 702 | Spare parts
15. Spare parts
Part No. Description
78656 Measurement amplifier GW 702
78657 Sensor holder, incl. 10 m cable
13606 Pipe clamp d 25 PE
Accessories
23600131 Power supply backup system
78009 External horn
77214 Strobe
77215 Flashing light
Wearing parts
78658 Sensor element for GW 702, chlorine gas
78659 Sensor element for GW 702, chlorine dioxide
78673 Sensor element for GW 702, ozone
Device revision
This operating manual applies to the following devices:
Device and model Revision status Device ID S/N
GW 702 11/2009 > 8534 > 271B0000203
It contains all the technical information required for installation, start-up and maintenance. Should you have
any questions or require further information regarding this operating manual, please contact the manufacturer or its official national representative.
Index | Operating Manual GW 702 | 27
Index
A
Acknowledgement ........................................................20
Alarm procedure ...........................................................20
Alarm thresholds .............................................................8
Analogue inputs of the sensors ......................................25
Analogue output............................................................22
C
Cable length .................................................................12
Calibration ....................................................................23
Case of application..........................................................6
Check function ..............................................................22
Choice of sensors .........................................................17
Configuration ................................................................17
D
Device revision..............................................................26
Dimensional drawing .......................................................7
Display .........................................................................15
Display contrast ............................................................24
Disposal .......................................................................24
Drill template ................................................................14
E
Erase Settings...............................................................25
Example .......................................................................20
F
Fuse...............................................................................8
I
Installation ....................................................................11
Interface .......................................................................22
K
Keys .............................................................................15
L
Language .....................................................................16
Limit value ....................................................................20
M
Maintenance .................................................................23
Measurement amplifier....................................................6
Measuring gas ................................................................6
Measuring principle .........................................................9
Measuring range .............................................................9
Menu overview .............................................................16
O
Operation .....................................................................15
P
Part numbers ..................................................................5
Power consumption ........................................................8
Power supply backup system ...........................................6
Protective circuit ...........................................................11
R
Relay ............................................................................20
Relay Test .....................................................................25
Replacing the sensor .....................................................23
S
Safety instructions ..........................................................3
Scope of delivery ............................................................5
Self-locking ..................................................................20
Sensors ..........................................................................6
Sensor slope .................................................................18
Sensor test ...................................................................18
Service .........................................................................25
Setting parameters........................................................15
Spare parts ...................................................................26
Start up ..........................................................................5
Supply voltage ................................................................8
Suppression element .....................................................11
T
Technical data ................................................................8
Test gas .......................................................................24
Turn-on delay ...............................................................19
W
Warranty claim..............................................................28
Wiring diagram .............................................................13
28 | Operating Manual GW 702 | Warranty claim
Warranty claim
Please copy and enclose with the unit.
If the device fails during the warranty period, please clean it and return, accompanied by the completed warranty claim form.
Sender
Company: ......................................................................... Telephone: .................................. Date: ..................................
Address: .........................................................................................................................................................................
Contact person: ..............................................................................................................................................................
Manufacturer order No.: .................................................... Date of delivery: .....................................................................
Device type: ...................................................................... Serial number:........................................................................
Nominal delivery rate:/Nominal pressure: ..........................................................................................................................
Fault details: ...................................................................................................................................................................
......................................................................................................................................................................................
......................................................................................................................................................................................
Type of fault:
1. Mechanical fault 2. Electrical fault
Premature wear Loose connections such as connectors or cables
Wearing parts Controls (e.g. switches / buttons)
Breakage/other damage Electronics
Corrosion
Damage in transit
3. Leaks 4. No or inadequate operation
Connections Diaphragm defective
Dosing head Other
Operating conditions of the device
Application site / site description: .....................................................................................................................................
Accessories used if any: ..................................................................................................................................................
......................................................................................................................................................................................
......................................................................................................................................................................................
Setup (date): ...................................................................................................................................................................
Runtime (approx. number of operating hours): ...................................................................................................................
Please indicate the specific features of the installation and enclose a simple sketch showing materials, diameters, lengths and
heights.
CE-Gaswarngeräte-V04
GW 601
GW 404
GW 504
GW 702
2006/95/EG
2004/108/EG
EU-Konformitätserklärung
Der Unterzeichnete Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark, bestätigt, dass die nachfolgend bezeichneten Geräte in der
von uns in Verkehr gebrachten Ausführung die Anforderungen der harmonisierten EU-Richtlinien, EU-Sicherheitstandards und
produktspezifischen Standards erfüllen. Bei einer nicht mit uns abgestimmten Änderung der Geräte verliert diese Erklärung ihre Gültigkeit.
(EN) EU Certificate of Conformity
The undersigned Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark. hereby certifies that, when leaving our factory, the units indicated
below are in accordance with the harmonised EU guidelines, EU standards of safety and product specific standards. This certificate becomes
void if the units are modified without our approval.
(FR) Certificat de conformité aux directives européennes
Le constructeur, soussigné: Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark, déclare qu’à la sortie de ses usines le matériel neuf
désigné ci-dessous était conforme aux prescriptions des directives européennes énoncées ci-après et conforme aux règles de sécurité et
autres règles qui lui sont applicables dans le cadre de l’Union européenne. Toute modification portée sur ce produit sans l’accord express de
Jesco supprime la validité de ce certificat.
(ES) Declaración de conformidad de la UE
El que subscribe Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark, declara que la presente mercancía, objeto de la presente
declaración, cumple con todas las normas de la UE, en lo que a normas técnicas, de homologación y de seguridad se refiere, En caso de
realizar cualquier modificación en la presente mercancía sin nuestra previa autorización, esta declaración pierde su validez.
(NL) EU-overeenstemmingsverklaring
Ondergetekende Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark, bevestigt, dat het volgende genoemde apparaat in de door ons in
de handel gebrachte uitvoering voldoet aan de eis van, en in overeenstemming is met de EU-richtlijnen, de EU-veiligheidsstandaard en de
voor het product specifieke standaard. Bij een niet met ons afgestemde verandering aan het apparaat verliest deze verklaring haar
geldigheid.
(HU) EG (EK)– Egyezőségi nyilatkozat
A Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark ezúton kijelenti, hogy a szóban forgó termék annak tervezése és szerkezeti
módja, valamint forgalomba hozott kivitele alapján a vonatkozó alapvető biztonság technikai és egészségügyi követelményeknek és az alábbi
felsorolt EG –irányelveknek minden szempontból megfelel. A terméken engedélyünk nélkül végrehajtott módosítások következtében jelen
nyilatkozat érvényét veszíti.
(PT) Certificado de conformidade da UE
Os abaixo mencionados Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark, por este meio certificam que ao sair da fábrica o aparelho
abaixo mencionado está de acordo com as directrizes harmonizadas da UE, padrões de segurança e de produtos específicos. Este
certificado ficará nulo se a unidade for modificada sem a nossa aprovação.
Gaswarngerät
Gaswarning device
Detecteur de fuite de chlore gazeux
Detector de Gaz chloro
Gas-waarschuwingsapparaat
Gáz figyelmezteto készülék
Bezeichnung des Gerätes:
Description of the unit:
Désignation du matériel:
Descripción de la mercancía:
Omschrijving van het apparaat:
A termék megnevezése:
Designação do aparelho:
Typ / Type / Tipo / Típusjelölés:
(IT) Dichiarazione di conformità alle norme UE
La sottoscritta Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark, certifica che il prodotto qui de seguito indicato, nei modelli
da noi commercializzati, è conforme alle direttive armonizzate UE nonché agli standard di sicurezza e agli standard specifici di
prodotto. Qualunque modifica apportata al prodotto senza nostra specifica autorizzazione invalida la presente dichiarazione.
(DK) EU Overensstemmelse certifikat
Undertegnede Lutz-Jesco GmbH, Am Bostelberge 19, 30900 Wedemark, bekræfter hermed, at enheder listet herunder, ved
retningslinier, EU sikkerhedsstandarder og produktspecifikationsstandarder. Dette certifikat træder du af kraft hvis enhederne er
ændret uden vor godkendelse.
EU-Richtlinie / EU directives/
Directives européennes / Normativa UE /
EU-richtlijnen / Vonatkozó EG-irányelvek /
Directrizes da UE
EN 50081-1 : 01.92
EN 50081-2 : 08.93
Harmonisierte Normen / harmonized
standards / Normes harmonisées /
Estándares acordemente / Toegepaste normeringen /
Hatályos normák / Normas harmonizadas
i.V. Dipl. Ing. Klaus Albert
Lutz-Jesco, Wedemark, 01.02.2009
Technische Leitung / Technical Departement Manager / Direction technique /
Dirección Técnica / Hoofd technische dienst / Műszaki irodavezető / Director Técnico
Descrizione del prodotto:
Direttive UE:
Conformità completa:
Direzione Tecnica
CE-Gaswarngeräte-V04
CE declaration of conformity
30 | Operating Manual GW 702 | Notes
Notes
Notes | Operating Manual GW 702 | 31
Notes
Lutz-Jesco GmbH
Am Bostelberge 19
30900 Wedemark
Germany
Telephone: +49 5130 5802-0
Fax: +49 5130 580268
info@lutz-jesco.com
www.lutz-jesco.com/de
24 hour hotline: +49 5130 580 280
Austria
Lutz-Jesco GmbH
Aredstraße 7/2
2544 Leobersdorf
Austria
Telephone: +43 2256 62180
Fax: +43 2256 6218062
info@lutz-jesco.at
www.lutz-jesco.at
Netherlands
Lutz-Jesco Nederland B.V.
Nijverheidstraat 14 C
2984 AH Ridderkerk
Netherlands
Telephone: +31 180 499460
Fax: +31 180 497516
info@lutz-jesco.nl
www.lutz-jesco.nl
USA
Lutz-JESCO America Corp.
55 Bermar Park
Rochester, NY 14624
USA
Telephone: +1 585 426-0990
Fax: +1 585 426-4025
mail@jescoamerica.com
www.jescoamerica.com
East Asia
Lutz-Jesco
East Asia Sdn Bhd
Taman Perindustrian Jaya
47200 Petaling Jaya
Malaysia
Telephone: +603 78454812
Fax: +603 78458413
info@lutz-jescoasia.com
www.lutz-jescoasia.com
Middle East
Lutz-Jesco Middle East FZE
P.O. Box 9614
SAIF-Free Zone Center
Sharjah
UAE
Telephone: +971 6 5572205
Fax: +971 6 5572230
info@jescome.com
www.jescome.com
Order No. BA-23607-02-V05
Subject to technical changes
© Lutz-Jesco GmbH 04.2014
Printed in Germany
Hungary
Lutz-Jesco Üzletág
Vasvári P. u. 9.
9024 Györ
Hungary
Telephone: +36 96 523046
Fax: +36 96 523047
info@lutz-jesco.hu
www.lutz-jesco.hu
Great Britain
Lutz-Jesco (GB) Ltd.
Gateway Estate
West Midlands Freeport
Birmingham B26 3QD
Great Britain
Telephone: +44 121 782 2662
Fax: +44 121 782 2680
info@lutz-jesco.co.uk
www.lutz-jesco.co.uk
*BA-23607-02*
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ISO 9001:2008
ISO 14001:2004
Quality Management
ISO 9001:2008
Environmental Management
ISO 14001:2004
Voluntary participation in regular
monitoring
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