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Technical
Index - Photain Index
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| * Low Profile Aesthetic Design |
* Optical chamber using Tyndall principle |
| * Surface Mounted high reliability technology |
* LED Alarm Indication |
| * Integral Locking Facility |
* Remote indicator connection |
| * Advance immunity against insect ingress |
* Surface and Recess Base Mounting |
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This unit operates on the light scattering principle.
An internal infra red light source is pulsed, with the
light beam arranged so as to by-pass a receiving unit.
The presence of smoke scatters the light beam, causing
it to be reflected onto the receiving photocell. An
evaluation circuit measures the amount of light and
compares it to a reference. The detector is triggered
into an alarm state when the amount of smoke exceeds
a preset level. To ensure against false alarms, several
pulse readings are taken and compared before the detector
is triggered into alarm.
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Detector type:
Visible smoke detection
Detection principle:
Photoelectric detection of light scattered in a forward
direction by smoke particules
Chamber configuration:
Axially disposed light source lens systems and light sensor
Emitter:
GaA1As diode
Sensor:
Silicon photodiode
Sampling frequency:
Once every 5 seconds nominal
Confirmation frequency:
1 second
Number of confirmation:
2 |
Supply voltage:
15 - 30vDC
Quiescent current:
Less than 60 microAmps
Alarm current:
Max 100mA
Alarm indicator:
Red light emitting diode illuminated
continuously
Remote alarm output:
Rated at 50mA max.
Sensitivity:
Responds to all types of fire tests as per EN54 Part7
Operating temperature range:
-10 to +75°C
Humidity:
Up to 95% R.H.
Wind:
Insensitive to wind interference
Altitude:
0-6000 metres |
Vibration:
To EN54, Part 7, annex L
Impact:
To EN54, Part 7, annex O
Shock:
To EN54, Part 7, annex N
Electrical transients:
500v spikes rise time 2 microseconds
Weight:
Detector: 119grammes
Base: 75grammes
Dimensions:
Detector in Base Assembly
Height: 60mm
Diameter: 108mm
Colour:
White
Environmental Protection
IP32
Technical compliance:
This detector is approved to EN54-7, BS5445 Part 7 |
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