SELF-CONTAINED BREATHING APPARATUS (CTS-IB-PPE-01)
©Chlorine Tech Services (Pty) Ltd
–
CIPC Reg # 2018/101848/07
Rev # 01/2020/10/15
P a g e
| 7
The reducer is mounted in the lower area of the back plate. It reduces pressure of
the high-pressure air from the cylinder to mid pressure at about 7 bar. The air is
delivered through medium pressure hose to demand valve, reduce the pressure
again and then used by the user. Turn the hand wheel and connect the cylinder
connector with the cylinder. Once the cylinder valve is opened, the user can view
the pressure indication from the pressure gauge as which is connected to the high-
pressure hose. A pressure alarm device is equipped in the reducer. When the
pressure of the cylinder is lowered to 55 ± 5 bar, it will give off audible alarm signal
≥ 90 dB. The alarm device will not be dependent on the ambient air when alarm
device gives an alarm, so the alarm device will not lose its function even if in high
humid atmosphere or under sprinkle water, or even in very low temperature. In
addition, the air consumed for the alarm device’s alarm is ≤ 5 L/min.
There is also a safety release valve, which is set to about 11 bar, in case there is
anything wrong and the medium pressure rises, the valve will be opened, release
the over pressure to guarantee the performance of the demand valve.
2.6.
The Demand Valve
The demand valve is a lung governed demand valve for a compressed air breathing
apparatus. It is connected between compressed air supply and full-face mask and
controls the inhaled and exhaled air. The demand is not an independent breathing
apparatus. It must be used exclusively mounted on a full-face mask. The demand is
not suitable for underwater diving.
1. Medium Pressure Hose
3. Port of Mask
5. LDV Button
2. Exhaust Button
4. Operating Button
Don’t push operating button and exhaust button at the same time. Don’t press
down the red and black button during the use, because pushing both buttons
can disconnect the demand valve from the mask.
The outer housing of the demand valve is made of high strength engineering plastic
to endure possible collision. The demand valve must be used with full mask.
2.7.
Medium Pressure Hose
The explosion pressure for medium pressure hose is not less than four times of the
reducer output pressure. Connection of the medium pressure hose with the demand
Fig. 4
5
