SMD-426, SMD-427
20 D-302758
SMOKE SENSORS (SMD-426, SMD-427)
Supervised Wireless PowerG Smoke / Heat and Smoke Detector
1. DESCRIPTION AND APPLICATIONS
SMD-426 (smoke detector) and SMD-427 (heat and smoke
detector) are automatic fire detectors with integral audible signal
for open area protection, designed to sense heat or smoke (not
flame) and fitted with a PowerG type transceiver.
SMD-426 / SMD-427 provides early warning of developing fire by
sounding an alarm with its built-in alarm horn, and by transmitting
a coded alarm signal to a PowerG receiver or to a compatible
wireless alarm control panel.
SMD-427 will activate a fire alarm upon either smoke or heat
(temperature rate-of-rise) condition. With two fire sensors (heat
and smoke), the SMD-427 detector may shorten the time to fire
alarm activation.
BUZZER
HOLE
TEST / MUTE
BUTTON
&
LEDS
Figure 1. General View (SMD-427)
It must be borne in mind, though that effective prewarning of fire accidents is only possible if the detector is
located, installed and maintained as described here.
In alarm condition, the buzzer sound can be stopped for 12 minutes by pressing the TEST/MUTE switch. It will not
restore the alarm condition, but will temporarily silence the buzzer while you correct the condition. After 12 minutes,
the detector restarts the alarm buzzer sound.
Note: The TEST/MUTE switch functions as TEST switch (in normal operation) or as MUTE switch (in alarm
condition).
The tamper switch actuator (Figures 9a and 9b) is pressed against the bracket when the unit is attached to the
bracket. Removal of the unit from the bracket causes the switch contacts to open, creating a tamper event, which is
reported by the transceiver to the alarm system control panel.
Note: When the tamper switch is opened the detector becomes not ready for operation.
2. SPECIFICATIONS
SMOKE DETECTOR
Alarm Sound Level
85 dB at 3 m (10 feet)
WIRELESS
Frequency Band (MHz)
Europe: 433, 868, USA: 915
Modulation
GFSK.
Tamper Alerts
Tamper event (removal of the unit from its bracket) is reported once. Tamper
restore is reported when the tamper switch is restored.
ALARM REPORT
In the alarm condition, the detector sends the alarm event to the control
panel. When the alarm condition is restored, the detector sends an alarm
restore event to the control panel and sets the alarm restore indication (red
LED blinks once per sec.)
Note: The alarm restore indication can be cleared via the control panel
only.
ELECTRICAL DATA
Power Source
3 Volt CR123A / CR17450 lithium.
Operation Voltage
From 2.5 V to 3 V.
Current Drain
22 µA standby, 200 mA max. in operation
Smoke Density
Europe: 0.09 – 0.14 dB/m
USA: 1.44%/ft to 2.74%/ft
Cover Range
50 – 100 cubic meters (1770 – 3530 cubic ft.)
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