Spectrex 20/20R - Single IR Flame Detector User Manual
Page 21
Spectrex Inc. - SharpEye
TM
Single IR Flame Detector Manual – TM 20/20R, Rev. A January2005
13
4.3.3 Alarm Delay switch (SW3):
The detector is equipped with an Alarm Delay option, which provides
programmable time delays of 0 to 30 seconds with eight (8) fixed settings at: 0,
anti-flare, 3, 5, 10, 15, 20, and 30 seconds, using SW3 switches 1-3. See table 10.
When an Alarm (Detection) level condition is encountered, the detector delays the
execution of the Alarm output relay by the specified period of time. The detector
will then evaluate the condition for 3 seconds. If the Alarm level is still present, the
Alarm output will be activated. If this condition no longer exists, the detector will
return to its standby state. The Alarm delay option will affect the output relay and
the 4-20mA output but not the alarm LED.
Table 9: SW3 Alarm Delay Setting
SW3 switches
Delay (seconds)
4 3
2
1
0 ---
OFF
OFF
OFF
Anti Flare (default)
---
OFF
OFF
ON
3 ---
OFF
ON
OFF
5 ---
OFF
ON
ON
10 ---
ON
OFF
OFF
15 ---
ON
OFF
ON
20 ---
ON ON
OFF
30 ---
ON ON
ON
Note:
The new FM approval from January 2003 does not allow using 20 and 30
second delay.