S Fire SF518 Series User Manual

INTRODUCTION
S FIRE's SF518 Series Gas Detector is effective for
detecting any buildup of natural gas and liquefied gas in your
residence. The SF518 gas detectors are engineered to
perform the following features:
(1) Easy to install. It allows connecting to fire control panel or
security monitoring system.
(2) Monitoring any accidental leaks of natural gas or liquefied
gas in a continuous manner.
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(3) Giving a loud alarm ( 75 dB) when it detects a buildup of
natural gas and liquefied gas.
(4) Self-testing its operative functions continuously
(5) Offering a 5-year warranty for the gas sensing unit.
GASEOUS FUEL IN OUR DAILY LIFE
Either natural gas or liquefied gas has become one of the
major energy sources for our modern life, which has been
found its numerous applications in many sectors such as
household, business, industrial usage and heating systems in
the buildings. At home, we use gas for cooking, heating, and
other purposes. However, any accidental gas leaks into the air
may lead to possible hazards such as fire and explosion, which
is definitely a potential threat to the lose of our lives and
household properties. Most likely sources of leaks come from
natural gas appliances such as heaters, stoves, refrigerators,
and furnaces. Gas leaks from outside or below ground level
can also seep into your home. However, as natural gas builds
up, it mixes with oxygen to produce a mixture that can be
combustible and explosive if it is ignited by a spark or flame.
That's why we should be more cautious to any accidental leaks
of natural gas or liquefied gas in a continuous manner. The
sensor vent port of the gas detector would allow natural gas to
enter the sensor chamber to be monitored by the sensing
circuit built inside.
LOCATIONS WHERE WE NEED TO INSTALL GAS
DETECTORS
1. Liquefied gas is heavier than air, the leak of such gas
collects near to the floor or in the lowest levels of rooms. To
detect a dangerous concentration of liquefied gas, you should
install your detector under 30 cm above the floor and less than
4 m of horizontal distance to the gas appliance in the same
room.
2. Natural gas is lighter than air, therefore, it collects in the
ceiling of rooms. In order to reach effective sensibility of
natural gas leaks, you should install your gas detector as close
to the ceiling as possible, i.e. under 30 cm from the ceiling and
less than 8 m of horizontal distance away from gas burner or a
kitchen stove in the same room, as shown in Figure 1.
Gas detector can only perform sensitively to the same
location where the gas appliances exist. Since the unusual
gas leaks may occur in other locations in your home, it is
strongly recommended that gas detectors are installed in the
areas where a gas burner or a kitchen stove is used such as
kitchen, living rooms, bed rooms, garage, and basement. (see
Figure 2).
GAS DETECTOR
SF518 SERIES USER'S MANUAL
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Figure 1. Suggested installation positions for SF518 series gas
Detectors
Figure 2. Locations for installing gas detectors in your home
WIRING DIAGRAM FOR SF518 SERIES GAS
DETECTORS
shows the wiring diagram for SF518 series gas
Figure 3
detectors(only SF518-R have relay output).
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