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F-Guard IR3 H2 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 H
2
fire
would be reliably detected.
T
ABLE
3:
S
ENSITIVITY LEVELS
Sensitivity level
Detection distance
in feet (meters)
Very Low
16 (5)
Low
33 (10)
Medium
66 (20)
High
98 (30)
Extreme
98 (30)
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 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 time 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 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.
1
A standard fire is defined as a 32-in Plume of H2 fire, with maximum wind speed of 6.5 ft/s (2
m/s).
