GAS DETECTOR
REFERANCE MANUAL
MODEL: EW-403 (LNG.LPG)
[ NOTICE ]
● Surely be aware of the specifications by skilled worker prior to using the product.
● Surely keep the specifications to where you are always able to see.
[ CONTENTS ]
1. SPECIFICATIONS
1-1. INDICATOR
1-2. SENSOR
2. PART & FUNCTION
2-1. INDICATOR
2-2. SENSOR
3. COMPOSITION
3-1. INDICATOR
3-2. SENSOR
4. OPERATIONAL SYSTEM
5. INSTALLATION
5-1. Where to install
5-2. Installation drawing
6. INSTRUCTION & CAUTIONS
7. DIMENSIONS
*User’s manual is not responsible for unauthorized changes
1. SPECIFICATIONS
Model
Gas Leak Detector EW-403
Detectable Gases
LPG, LNG, City Gas, Combustible Gas, Toxic Gas (NH3.H2)
Power supply
AC 220V. 60㎐
Power consumption
Normal condition - 2.5W. Alarm condition - 3W
Operating Temperature
&Humidity
0℃ ~ 40℃, Below 95%(RH)
Detection Range
0 ~ 100% LEL
Alarm point
Combustible gas- below 25% LEL (The set point is 18% LEL now)
Response time
Within 20 sec
Concentration display
3 FND 10 LED bar
Visual & audible Alarm
Yellow LED blinking, Buzzer Sound (above 70dB)
Operating
Green LED
Fault
Yellow LED, buzzer sound (short sound)
Warmup Time
about 1 min.
Cabling
VCT,CVVS (above 0.75mm)
Dimensions
149*259*87mm
Output
DC 12V (20~30mA). Dry contact (COM.NO.NC)
Relay contact
AC 220, 1A
Weight
about 1,718g
Model
EW EX Ⅱ B 100
Detectable Gases
LPG, LNG, City Gas, Combustible Gas, Toxic Gas
Detection Technique
Catalytic combustion, diffusion
Operating Temperature &
Humidity
-20℃~50℃. below 95% (RH)
Explosion-Proof
Exd Ⅱ BT6
Conduit entry
16mm inside diameter, 23mm outside diameter
Dimensions
140*142*75 mm
Weight
1,016g
Detection range
0~100%(LEL)
Response time
within 20 sec
1-1. INDICATOR
1-2. SENSOR
2. PART & FUNCTION
2-1. INDICATOR
①Power light : Green LED is lit while
Supplied by AC 220V.
②Alarm mute warning light: Buzzer
Stop Yellow LED blinks if the alarm
Mute button is pressed. And
during this time, the audible alarm
Is mute in spite of the alarm
condition. And if the button is
pressed again, the light is
eliminated and the buzzer
becomes audible again.
③Test button: It allows the user
to Check the circuit of the UNIT
Panel. If it is pressed, the
concentration of gas, as if gas is
detected actually. And if the
concentration exceeds the alarm
point the audible alarm beeps
④Alarm mute button: If allows the user to silence the buzzer when it’s alarm condition.
If pressed one time, buzzer becomes mute. And pressed again, Buzzer becomes audible
again
⑤Reset button: It allows the user to reset the value of the concentration. But if the
Concentration of gas exceeds alarm point the alarm condition is not reset.
⑥LED dot display: It displays the concentration of gas on LED dot display
⑦Warning light(ALARM): Yellow LED blinks when gas is detected, eliminated in normal
condition
⑧Digital display: It displays the concentration of gas on 7segement display
: If the concentration exceeds the point and the value of the concentration is maintained
For several seconds, it displays letter GAS and the value of concentration by rotation
(If the concentration keeps changing the changing value of concentration is displayed
only)
⑨Fault light (ERROR): It gets lit when the fuse for the sensor has blown. Or the connection
Wire between the sensor and the indicator is connected or short-circuited. Or the
sensitivity of the sensor has been lost
2-1. SENSOR
Hexagonal headed bolt and packing
Hexagonal headed bolt and packing cannot be used in the areas
that require explosion-proof
① Sticker (Explosion proof)
② Sensor cover ③ Sensor bady
④ Explosion proof approval sticker (Korea gas safety corporation approval)
⑤ Cover fixing hole: The bolt for fixing cover and body of detector
(Wrench bolt M5x15)
⑥ Sensor fixing hole: The hole for fixing the detector by bolts or nails
⑦ Sensor protection filter: Sensor protection filter (bronze 300mesh)
⑧ Ground earth: M4x6mm
⑨ Cable grand; Do sealing fitting properly or access using cable glands passed the
safety certification. When the way of inlet pipes and tubes of metal wires in
areas that require explosion-proof
3. COMPOSITION
3-1. INDICATOR
Blue (White) +
Brown (Black)-
Green (Wire of signal)
Power supply of sensor +
(DC 24V)
Power supply of sensor –
(DC 24V GND)
Output of Sensor
(4~20mA)
○1 AC FUSE (2EA): 220V 1A glass tube
(When it has blown, RED warning light of the fuse gets lit)
○2 Power switch: AC power supply switch
○3 BUZZER: It makes audible alarm
WIRING DIAGRAM
- AC 220V input terminal: Please connect with rated voltage (AC 220V)
- Dry contact (NO NC COM): In normal condition, COM terminal is connected with
NC terminal. And in alarm condition. COM terminal is connected with NO terminal
- Sensor connector (terminal block): Please match the wire with terminals in color
- Alarm output terminal: These terminals are used when the indicator outputs the
Alarm signal to the control panel and others (DC 12V 20mA)
3-2. SENSOR
Blue (White) +
Brown (Black)-
Green (Wire of signal)
Power supply of sensor +
(DC 24V)
Power supply of sensor –
(DC 24V GND)
Output of Sensor (4~20mA)
○1 Connector (terminal block)
○2 Zero calibration: We release the detector with it being set. Do not attempt to modify
○3 Concentration light: The brightness of yellow light changes in proportion to the
Concentration of gas (eliminated in normal condition)
○4 Power supply light: Green LED is lit while supplied with power
4. OPERATIONAL SYSTEM
5. INSTALLATION
5-1. Where to install
① The detector is designed to be installed in the area that is subject to
expose to gas or the area where the leaked gas tend to stay.
② Please determine the location of the sensor considering the kind of the
Gas, cautions and condition.
③ If you are to detect the gas that is heavier than air, sensor be mounted at
Floor or the wall within 30cm from floor, and if you are to detect the
Gas that is lighter than air, sensor should be mounted at the ceiling or
The wall within 30cm from ceiling
(Plus: sensor should be farther than 1m and within 4m from the gas appliance)
④ Please install the detector at the place that the audible alarm is able to be
Heard so that manager can take follow-up measures.
5-2. Installations drawing
※ PLACE TO INSTALL: kitchen, Boiler room, Room of pressure regulator, Gas storage
6. INSTALLATION & CAUTIONS
6-1. INSTRUCTION
①Please open the case and connect the sensor with the indicator. And
connect the AC 220V power supply as well.
②Please turn on the power supply switch and wait for warm up time
1(minute) in 1minute, the detector begins to operate.
③Fault light (ERROR) on the UNIT panel gets lit when the fuse for the
Sensor has blown or the connection wire between the sensor and
The indicator is disconnected or short-circuited. Or the sensitivity of
The sensor has been lost.
④If you are to test the operation of the detector, please press the test
Button on UNIT panel, Then the concentration increases as if gas
Is detected actually. And if the level exceeds the alarm pint, the
Detector makes visual and audible alarm.
⑤If you want to stop the audible alarm, please press the alarm mute
Button (B/Z stop) If you do, alarm mute warning light (B/Z Stop) blinks
And the audible alarm becomes mute.
⑥ When the fault light gets lit, please check the connection between
Sensor and indicator.
6-2. CAUTIONS
1. Do not attempt to disassemble, repair, remodel or convert.
2. If you purchase the product which has earth terminal, please install an earth wire.
3. Do not touch the power cord or main body with wet hand.
4. Do not disturb the ventilation of the Sensor
5. Be careful not to damage the power cord.
6. Be cautious about using the silicon glue which could affect the Sensor. Silicon
glue could cause malfunctioning.
7. Please use the rated voltage (AC 220V) written on the product.
8. Do not spray the Sensor directly with air freshener, insecticide, hair spray etc.
9. Please use standard gas when testing.
10. Please connect Indicator with same Sensor in serial number.
11. Do not use for the gas that is not target one.
12. Please check the sensing device more than once a year.
13. Areas to avoid 1.Near drafts caused by heating, ventilating, fans and doors
2. Near vapor, steam, exhaust gas, dust, strong wind and other
gases
3. Areas of high heat and humidity.
7. Dimensions
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