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Description & Commissioning
Device functionality
All S-Quad devices are monitored periodically to check if they are
working correctly, an indication of a fault is given if there is a
failure. For example the infrared signals through the optical
chamber are regularly checked, the thermistor is checked and
the CO cell circuit is monitored for failure. The speech, VAD and
sounder circuits are monitored for failure.
Heat sensor (H)
The heat sensing is provided by a thermistor. The temperature at
which the device goes into fire is defined by the configuration
settings in the control panel. The control panel also calculates
any rate of rise elements required in the fire decision.
Optical sensors
Optical Chamber
Transmitter
LED2
Dual Optical Sensor
The optical sensing is performed by the dual angle optical
chamber, which has two transmitting LED1 and LED2, plus an
infrared receiver. Normally measurements are taken at regular
intervals at both angles of the chamber. The panel uses both
readings to form a ratio. The ratio is used to compensate the
optical sensor, producing a very flat response to different fire
types. There are distinct bands of ratios that define the presence
of types of smoke, dust or steam. The dual optical sensor is
therefore able to discriminate between certain aerosol in the
environment. Additionally to stop the sensor saturating with large
false alarm signals the sensor incorporates an extended dynamic
range. The sensor is therefore suitable for use in wider
applications where steam and dust particles may occasionally be
present.
Single Optical Sensor
The optical sensing is performed in the optical chamber using
transmitting LED 1 and an infrared receiver. Measurements are
taken at regular intervals. The control panel use these readings
to detect the presence of smoke.
2
Carbon Monoxide gas sensor (CO)
The Carbon Monoxide (CO) sensing is provided by a CO cell.
The CO cell will sense carbon monoxide gas that is generated
from carbon based smouldering fires. The CO sensor is resilient
to particles of dust, steam and insects. The CO gas sensing
element is used with the heat and smoke sensors to give a
capability of detecting a very wide range of fire types.
The CO is always used with the heat and optical sensor to give a
capability of detecting all EN54 : Part 7 fire tests.
Heat Sensor
Sounder (S)
Transmitter
LED1
The sounder function in a is designed to meet the requirement of
EN54 : Part 3. The EN54 : Part 3 average output from the
sounder is 85dBA at 1m or 75dBA at 3m at a bedhead, making it
suitable for installation in hotel bedrooms. The sounder can
operate a turbo mode if configured during commissioning to
provide further 3dB output. The sound outputs are based on the
settings of the FABs and SABs at the panel that gives changing
levels over 2 seconds duration in 8 time slots. The standard
outputs are synchronised with the 34000 sounders and S
Receiver
devices installed in the same system.
A piezo disk within the S-Quad assembly outputs the sound via a
horn, which is constructed in the chamber moulding. The volume
of the sound output can be individually set at the device, note
that the sound level should not be set lower than 65dBA at 1m
for standards compliance. The system prevents adjustment of
volume down to zero. Another feature that can be configured is
the soft start that ramps the sound volume gradually to the
maximum level set at the device. The Sounder function is silently
monitored for failure. An S-Quad device with a white baffle
identifies it as having Sound functionality.
Tones
Signal 1* Intermittent tone 970Hz ±10% @ 1Hz
Signal 2* Alternating tone 730Hz ±10% / 970Hz ±10% @ 2Hz
Signal 3* High Tone (Continuous 970Hz ±10%)
The Signals marked with an * are LPCB approved.
CO cell
"
The CO cell has a life expectancy of
5 to 7 years, after this period the sensor should be
replaced.
"
The Sound Pressure Level on axis at 90° will
typically be 92dB(A).
4188-1073 issue 3_2-17_P2_S-Quad
S-Quad
3
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