Spectrex 40/40M Multi IR Flame Detector - Manual (Page 42)

Multi IR Hydrocarbon and Hydrogen Flame Detector User Guide
30 Configuring your Detector
 Heated Optics – Auto
 Temperature – 41°F (5°C)
2.8.1 Sensitivity
The detector offers four (4) sensitivity settings. The settings refer to an
n-heptane or gasoline fire of 1ft² (0.1m²), from low sensitivity of 50 ft.
(15m) to 215 ft. (65m). For other types of fuel sensitivity, refer to Table 3.
Table 16: Sensitivity Settings
Sensitivity Setting
Detector Distance
feet
Detector Distance
meters
15 50 15
30 (default) 100 30
45 150 45
60 215 65
2.8.2 Alarm Delay
The detector is equipped with an Alarm Delay option, which provides
programmable time delays with settings at:
 Antiflare* (default)
*The Antiflare mode is selected to prevent false alarms in locations
where fast flares may be present. The Time Delay for fire alarms in this
mode ranges from 2.5 to 15 seconds (usually, less than 10 seconds).
Other delays settings are available:
 0, 3, 5, 10, 15, 20 or 30 seconds
When an Alarm (Detection) level condition occurs, the detector delays the
execution of the Alarm outputs by the specified period of time. The detector
then evaluates the condition for 3 seconds. If the Alarm level is still present,
the Alarm outputs are activated. If this condition no longer exists, the
detector returns to its standby state.
The Alarm delay option affects the output relays and the 0-20mA. The LEDs
and outputs indicate warning levels during the delay time only if the fire
condition exists.
2.8.3 Address Set-up
The detector provides up to 247 addresses that can be changed with the
RS485 communication link or the HART protocol.