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gENERal aPPlICaTION
INfORmaTION
RESpONSE CHARACTERISTICS
Response is dependent on 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 fire test results.
wELDING
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 X9800. Welding rods with clay binders
do not burn and will not be detected by the X9800.
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 trigger the X9800.
ARTIFICIAL LIGHTING
The X9800 should not be located within 3 feet of artificial
lights. Excess heating of the detector could occur due to
heat radiating from the lights.
EMI/RFI INTERFERENCE
The X9800 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.
NON-CARbON FIRES
The response of the X9800 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.
4.3
FALSE ALARM SOURCES
The detector has been designed to ignore steady state
infrared sources that do not have a flicker frequency
characteristic of a fire, however, it should be noted that
if these steady state infrared sources are hot enough
to emit adequate amounts of infrared radiation in the
response range of the IR sensor and if this radiation
becomes interrupted from the view of the detector in a
pattern characteristic of a flickering flame, the IR sensor
can respond.
Any object having a temperature greater than 0° Kelvin
(–273°C) emits infrared radiation. The hotter the object,
the greater the intensity of the emitted radiation. The
closer the infrared source is to the detector, the greater
the potential for a false alarm. The IR sensor can respond
to IR radiation sources that can meet the amplitude and
flicker requirements of the detector such as vibrating hot
objects.
Although the detector is designed to reduce false
actuations, certain combinations of ambient radiation
must be avoided. For example, if IR radiation with an
intensity that exceeds the fire threshold of the IR sensor
should reach the detector as a flickering signal, and if at
the same time an electric arc welding signal also reaches
the detector, an alarm output will be generated.
Radiation generated by false alarm sources such
as periodic lightning or sparks in the area can be
effectively ignored by the detector using the arc
rejection feature or time delay.
4
NOTE
95-8555
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