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The Orbis base is a completely new time-saving design that provides
installers with an opening working area and single quadrant terminals,
with fixing holes shaped to allowa simple mounting procedure.
Features include two fixing centres, a guide to
indicate the length of cable to be stripped, and a continuity link
for voltage testing of zone wiring prior to commissioning. Where
there is a requirement to align all the LEDs to face the same way,
there is a guide mark on the base that allows correct positioning.
All bases have a mechanism for locking detectors if required.
Also available is a diode base for use in systems
which continue to operate even if one or more detectors have been
removed without authorisation; and a relay base.
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Orbis heat detectors are suitable in atmospheres with high dust
content or where fumes may temporarily be concentrated, such as
vehicles loading bays.
The heat detectors have an open-web casing that
allows air to flow freely acrossly a thermistor which measures the
air temperature every 2 seconds. The stored temperatures are then
compared against pre-set values to determine whether an alarm level
has been reached.
There are six heat detectors to suit a wide variety
of operating conditions.
Static heat detectors respond only when a fixed
temperature has been reached. Rate-of-rise detectors have a fixed
upper limit too, but they also measure the rate of increase in temperature.
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The multisensor smoke detector is a thermally enhanced smoke detector
that is a development of the optical detector and goes even further
in its capabilities of fire detection.
The optical sensor is influenced by the heat sensing
element, making the detector more responsive to fast-burning, flaming
fires.
It should be used as the detector of choice in
areas of high risk with heat at an early stage of the conflagration
and with increased likelihood of unwanted alarms.
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The Orbis optical smoke detector's sensing technology makes it significantly
different in design from existing optical detectors.
Although the Orbis optical detector operates on
well-established light scatter principle, it has a new optical system
that gives it even sensitivity to a broad spectrum of fire types,
whatever colour smoke is generated. The Orbis optical smoke detector
can therefore be calibrated at a sensitivity setting which makes
it less likely to generate flase alarms while still meeting international
detection standards. The stability of the detector is further increased
by the incorporation of drift compensation and the use of algorithms
to decide when the dector should change to the alarm state. This
greatly reduces the likelihood of a detector producing an alarm
as a result of smoke from a non-fire source.
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