7
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.
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 for details of flash rate)
Dimensions:
97mm diameter x 31mm height
100mm diameter x 46mm height (in base)
Weight:
Detector
75g
Detector in base
135g
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
ENVIRONMENTAL
PERFORMANCE
Orbis optical detectors operate over a
broad range of voltages at extremes of
temperature. Thus the operating voltage
is 8.5V to 33V at –40° to +70°C, a unique
achievement for a conventional smoke
detector.
