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
