SYSTEM DESIGN INFORMATION
13
A 24V supply is required - it must be isolated from detector supply if the RS485 interface option
is used. Leave the balun ground connection O/C.
Note: The detector monitors the internal temperature to decide when to switch the
video output mode. The temperatures in Table 1 are external temperatures and
vary depending on the environmental conditions and if the window heater is
enabled.
4.1.6 WINDOW HEATER
The FV300 has a heater to warm the sensing window and prevent misting. The heater is enabled
on the DIP switches. When enabled, the heater will turn off when the detector temperature rises
above +40º C.
4.1.7 WALK TEST INPUT
The walk test input provides a means to connect remote switches to the FV300 detector to activate
the alarm test and window test (OPM) functions or to reset the detector. The required operation is
selected by connecting the appropriate resistor value, see Fig 9, between the walk test input and
0V using a momentary switch. The switch should be opened once the function has been
activated. See Figs. 24, 25 and 26.
Note: The FV300 detectors are approved for use in both gas and dust atmospheres but
the WT300 Test tool is only approved for gas atmospheres. Where FV300
detectors are installed in dust risk environments the walk-test wired input should
be used.
From (º
C)
To(º C) Text
overlay
Video
camera
Video output
+70 +80 Off Off No video signal
+50 +70 On Off Overlay with blue background
-10 +50 On On Camera or blue background with
overlay
-30 -10 On Off Overlay with blue background
-40 -30 Off Off No video signal
Table. 1 Video Output
15k
WINDOW
TEST
4k7
RESET
1k8
ALARM
TEST
WALK TEST
INPUT
0V
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