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9.2
4
Quick Fire (High Speed)
The Quick Fire (High Speed) feature can be used in
conjunction with the TDSA signal processing method.
This method overrides TDSA requirements in the event
of an intense signal. When Quick Fire is activated, the
detector is capable of responding to an intense fire signal
in less than 30 milliseconds (0.030 seconds). Using
the Quick Fire feature in conjunction with TDSA signal
processing allows the detector to provide a high speed
response to a large, non-flickering fire (such as in high
pressure gas applications) while maintaining an ability to
respond to smaller fires.
UV DETECTOR OPTIONS
The UV detector in the X5200 can be programmed for:
–
Arc Rejection
–
Standard
Arc Rejection (Recommended Factory Setting)
The Arc Rejection mode enables the detector to
prevent nuisance fire alarms caused by UV from short-
duration electrical arcs or electrostatic discharge, while
maintaining the ability to reliably detect the UV given
off by a flame. Typical applications that benefit from arc
rejection logic include electrostatic coating processes
and uncontrolled environments where transient UV
sources can be present, such as many typical outdoor
applications. Most false alarm sources have short
transient UV signatures, while fire creates a long UV
signature over many seconds. Most fires are detected in
a few seconds (see response times in Appendix A).
Standard Signal Processing
Standard signal processing is recommended for
high-speed suppression systems only. To allow for
high-speed operation, the standard processing mode
does not incorporate the arc rejection programming.
This mode should only be used in a controlled, indoor
environment.
GENERAL APPLICATION
INFORMATION
RESPONSE CHARACTERISTICS
Response is dependent on the detector’s sensitivity
setting, arc rejection, and time delay settings. Other
factors include distance, type of fuel, temperature of the
fuel, and time required for the fire to come to equilibrium.
As with all fire tests, results must be interpreted according
to an individual application.
See Appendix A for third-party approved fire test results.
Additional fire test results are available from Det-Tronics.
Welding
Electric arc welding is a source of intense ultraviolet
radiation. UV radiation from arc welding readily scatters
and can deflect across significant distances, even when
direct obstructions exist. Any open door or window can
allow nuisance UV radiation from arc welding to enter an
enclosed area.
It is recommended that the system be bypassed during
welding operations in situations where the possibility of a
false alarm cannot be tolerated. Gas welding mandates
system bypass, since the gas torch is an actual fire. Arc
welding rods can contain organic binder materials in
the flux that burn during the welding operation and are
detectable by the X5200. Welding rods with clay binders
do not burn and will not be detected by the X5200.
However, system bypass is always recommended, since
the material being welded may be contaminated with
organic substances (paint, oil, etc.) that will burn and
possibly cause the X5200 to alarm.
Artificial Lighting
The X5200 should not be located within 3 feet (0.9m)
of artificial lights. Excess heating of the detector could
occur due to heat radiating from the lights.
EMI/RFI Interference
The X5200 is resistant to interference by EMI and RFI,
and is EMC Directive compliant and CE Marked. It will
not respond to a 5 watt walkie-talkie at distances greater
than 1 foot (0.3m).
Non-Carbon Fires
The response of the X5200 is limited to carbonaceous
fuels. It should not be used to detect fires from fuels that
do not contain carbon, such as hydrogen, sulfur and
burning metals.
