Beam sensor states
Beam sensor States
Ideal range
minimum to maximum
4 or 5
2m - 30m
2 or 3
5m to 100m
0 or 1
12m tp 100m
LPCB approval
The Beam sensor STATES 0, 1, 2 and 3 are undergoing
approval test at LPCB.
State
Definition
Application
State 0
Default
detection
A
fire
is detected when there is a 50% (3dB) fall in signal level, however if the fall is by 90% (10dB) in less than
1second and is maintained for 40 seconds, then a
fault
is registered. This allows the Control panel to differentiate
between a fire and a fault signal caused by accidental obscuration.
State 1
Normal
sensitivity
A
fire
is detected when there is a 50% (3dB) fall in signal level, however if the fall is by 90% (10dB) in less than
1 second and is maintained for 40 seconds then a
fire
is registered.
State 2
Medium
Sensitivity
A
fire
is detected when there is a 25% (1.3dB) fall in signal level, however if the fall is by 90% (10dB) in less than
1 second and is maintained for 40 seconds then a
fault
is registered.
State 3
Medium
Sensitivity
A
fire
is detected when there is a 25% (1.3dB) fall in signal level, however if the fall is by 90% (10dB) in less than
1 second and is maintained for 40 seconds then a
fire
is registered.
State 4
High Sensitivity
A
fire
is detected when there is a 10% (0.5dB) fall in signal level, however if the fall is by 90% (10dB) in less than
1 second and is maintained for 40 seconds then a
fault
is registered.
State 5
High Sensitivity
A
fire
is detected when there is a 10% (0.5dB) fall in signal level, however if the fall is by 90% (10dB) in less than
1 second and is maintained for 40 seconds then a
fire
is also registered.
State 15
No detection.
This is a total disablement of the sensor.
4188-949 issue 3_05/10_Nano Comms inst.
43
Nano panel based system
Sensor
States