AARU
ENGINEERS www.aaruengineers.com
Precautions:
To avoid personal safety injury, Instrument damage and potential dangerous
accident; do not use portable gas detector before reading this manual.
1. Description
GD gas alarm is a kind of wall-mounted household gas alarm designed to detect the
concentration of combustible and toxic gases or vapors using high quality air-sensitive
component and manufactured with advanced technology. It provides visual and audible
signals when the gas concentration reaches the presetting range, and reminds you to take
prompt favorable action.
2 Specifications
Model
□
GD201
□
GD221
□
GD401
□
GD501
□
GD601
□
GD701
□
GD801
Working Power
AC220V/110V±15%/DC24V/DC12V
≤3W
Working Conditions
Temperature: 0
℃～
55
℃
Humidity
：＜
95%
Response time
≤30s
（
GD701
≤2.5min
）
resume automatically
Gas Sampling
Diffuse naturally
GD201
：
combustible gas
10%LEL
GD221
：
combustible gas
16%LEL
GD401
：
for natural gas
10%LEL
Alarm level
GD501
：
for methane and propane 10%LEL
GD601
：
for propane
10%LEL
GD701
：
for CO
150ppm
GD801
:
for H2
1000ppm
Alarming Method
Visual and audible
Sound level
≥80dB
Weight
270g
Dimension
l×w×h,mm:126×78×37
Optional function
□
Gas shut off valve
□
relay output
Note: the power and the alarming level can be specified.
AARU
ENGINEERS www.aaruengineers.com
Normal domestic gas
：
LPG: propane and butane
；
Coal Gas
：
hydrogen and carbon monoxide
；
Natural Gas
：
methane
；
All of the normal domestic gases is combustible gas, whose LEL (lowest explode limited)
is below 10% of mixture with air.
When the concentration of the leaking gas in air, it will narcotize people’s centre nerve,
even cause suffocation.
Gas
Basis
Exploding Range
Toxicity
LPG
C
4
H
10
、
C
3
H
8
1.8%
～
9.5%
suffocation
Natural Gas
CH
4
5%
～
15%
suffocation
Coal Gas
H
2
、
CO
4%
～
75%
toxicosis
8.2
When the gas burning, it need abundant air, such as 1m
3
need about 30m
3
.So the
placed with hearth such as kitchen has to be keep ventilate.
8.3
LEL Meaning:
LEL is Lowest Explode Level. That is the lowest concentration of the gas in the air,
which will cause exploding when meeting fire.
8.4
Reasons of gas leakage:
Wrong ignition.
The fire is put out with winds during the cooking.
Fire is out during the cooking because of the change of the gas pressure.
The gas valve is not shut off well.
Wrong operation to the cooking tools.
The gas pipe is destroyed.
Other reasons.
8.5
Solutions of gas leakage:
Put out the fire.
Shut off the gas valve.
Open the windows and doors.
Check the leakage source.
Don’t try to turn off any electric equipment when alarming continuously. Call the
gas company with the outdoor phone.
Please knock at the door instead of pressing the doorbell when find gas leakage
in your neighbors’ home.
Declaration
To keep continued product improvement,
Hanwei
reserves the right to change design
features without prior notice
m
1
Tel: +91-9833707640 / 9870001727
m
6
Tel: +91-9833707640 / 9870001727
