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21
76-M-6010-02-02
F-Guard IR3 HD User Manual
Sensitivity
The detector can be configured to one of five sensitivity levels: very low, low, medium,
high and extreme. The following table lists for each sensitivity setting the maximum
distance, in which a standard fire
T
ABLE
3:
S
ENSITIVITY LEVELS
Sensitivity
level
Detection distance in feet (meters)
Very Low
25 (7.5)
Low
50 (15)
Medium
100 (30)
High
200 (60)
Extreme
260 (80)
Further details about the response characteristics of the detector at the different
sensitivity settings and fuel types can be found in section 10.
Ultra-Fast Detection
The ultra-fast detection feature allows the detection of fireballs and explosions at 40
milliseconds. This feature can be disabled or enabled regardless of the alarm delay
configuration.
Alarm Delay
When a fire is detected, the detector delays the execution of the alarm outputs up to the
configured period. After this time delay, the detector re-evaluates the situation. If a fire is
still detected the alarm outputs are activated.
Alarm Latch
If the alarm latch is enabled, the detector outputs will remain active even after a flame is
no longer detected. To reset the detector outputs the detector must be power cycled or
a manual BIT initiated.
Enable Pre-Alarm 0-20mA
If the Pre-Alarm is enabled and Alarm Delay is greater than 0, The detector 0-20mA
output will be 16mA and the red LED will blink in case of a fire condition.
Enable dirty window warning 0-20mA
If enabled, this feature assists predictive maintenance by indicating an alert when the
BIT signal is reduced by 75% of the value needed to trigger a BIT fault failure. When
activated, the milliampere output will drop to 3mA and the LED will remain steady green,
it should be noted that a fire signal will override the dirty window warning. A process
1
A standard fire is defined as a 1x1
ft
2
(0.1 m
2
) N-heptane pan fire, with maximum wind
speed of 6.5 ft/s (2 m/s).
