Spectrex 40/40L-LB UV/IR Flame Detector Series - Manual (Page 20)

SharpEye TM UV/IR Flame Detector User Guide
8 Performance Considerations
1.5 Performance Considerations
This section describes performance aspects of the 40/40L, LB, L4, L4B and
includes:
 Detection Sensitivity, page 8
 Cone of Vision, page 9
 False Alarms Prevention, page 11
 Visual Indicators, page 12
 Output Signals, page 13
 Detector Status, page 14
 Auxiliary Relay as End-of-Line Resistor, page 15
1.5.1 Detection Sensitivity
Detection sensitivity is the maximum distance at which the detector reliably
detects a specific size of fire and typical type of fuel (standard fire).
1.5.1.1 Standard Fire
Defined as a 1ft 2 / 0.1m 2 n-heptane pan fire, with maximum wind speed of
6.5 ft./sec (2 m/sec).
1.5.1.2 Sensitivity Ranges
The detector has two response levels:
 WARNING (Pre-alarm)
 ALARM
The detection distance for the ALARM level is 50 ft. (15m) for models
40/40L-LB, and 66ft. (20m) for models 40/40L4-L4B from a standard fire.
The detection distance, for the WARNING level, is approximately 10% higher
than the ALARM distance.
For some typical ambient conditions the Zeta parameter as defined in NFPA
72 for the detector is 0.005 (1/meter).
Note: Zeta parameters may vary significantly with changes in temperature,
air pressure, humidity, visibility conditions, and so on.
1.5.1.3 Other Fuels
The detector reacts to other types of fire as follows:
 The baseline fire refers to n-heptane 1ft 2 (0.1m 2 ) and is defined as
100% sensitivity.
 For fuel fire – standard pan fire size: 1 ft 2 (0.1 m 2 ).
 For gas flame - 20 inch (0.5m) high, 8 inch (0.2m) width plume fire.
 Maximum Response Time: 10 sec.