9
CONVENTIONAL DETECTORS
All data is supplied subject to change without notice.
Specifications are given at 23°C and 50% relative humidity unless otherwise stated.
DETECTOR OPERATING PRINCIPLES
Principle of detection: Photo-electric detection of light scattered by smoke particles
over a wide range of angles. The optical arrangement
comprises an infra-red emitter with a prism and a photo-
diode at 90° to the light beam with a wide field of view.
The detector’s microprocessor uses algorithms to process
the sensor readings. The heat sensing element increases the
sensitivity of the detector as the temperature rises.
Sampling frequency: Once every 4 seconds
ELECTRICAL
Supply voltage: 8.5—33V DC
Supply wiring: 2 wires, polarity sensitive
Maximum polarity reversal: 200ms
Power-up time: <20 seconds
Minimum ‘detector active’ voltage: 6V
Switch-on surge current at 24V: 95µA
Average quiescent current at 24V: 95µA
Alarm current: At 12 volts 20mA
At 24 volts 40mA
Alarm load: 600Ω
Holding voltage: 5–33V
Minimum holding current: 8mA
Minimum voltage to light 5V
alarm LED:
Alarm reset voltage: <1V
Alarm reset time: 1 second
Remote output LED 1.2kΩ connected to negative supply
(–) characteristic:
MECHANICAL
Material: Detector and base moulded in white polycarbonate.
Alarm Indicator: Integral indicator with 360° visibility
(See Table 3 on page 13)
Dimensions: 97mm diameter x 42mm height
100mm diameter x 57mm height (in base)
Weight: Detector 80g
Detector in base 140g
ENVIRONMENTAL
Temperature: Operating and storage temperature –40°C to +70°C
(no condensation or icing)
Humidity: 0% to 98% relative humidity (no condensation)
Wind speed: Unaffected by wind
Atmospheric pressure: Insensitive to pressure
IP rating to EN 60529: 1992*: 23D
Electromagnetic Compatibility: The detector meets the requirements of EN 61 000-6-3
for emissions and BS EN50 130-4 for susceptibility.
*The IP rating is not a requirement of EN 54 since smoke detectors have to be open in order
to function. An IP rating is therefore not as significant as with other electrical products.
TECHNICAL DATA
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www.acornfiresecurity.com
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