Apollo XP95 - Manual (Page 4)

page
4
ADDRESSING AND COMMUNICATIONS
Each XP95 device responds to interrogation and command
from central control equipment. It communicates to the
panel information on status, command bits, type, location,
and other information that allows an alarm to be raised
even when the device is not itself being interrogated.
Message error checking is also provided. The devices are
compatible with Series 90, Discovery ® and XPlorer systems
and control equipment to aid maintenance, extension and
upgrade of existing systems.
A unique, patented XPERT card provides simple, user
friendly and accurate identification of detector location
whereby a coded card, inserted in the base, is read by
any detector once it is plugged in. All the electronic
components are in the detector but the location information
is held in the base. The address card simplifies and speeds
up installation and commissioning. Addressing errors
during maintenance and service are eliminated.
The XP95 manual call point continues to use DIL switch
addressing, but its interrupt feature also provides automatic
reporting of its location in the interrupt mode.
The XP95 detectors provide an alarm facility that automatically
puts an alarm flag on the data stream and reports its address
when the pre-set EN54 thresholds are exceeded. The
devices provide great flexibility in system design with the
control equipment determining the characteristics of the
system. A large and growing range of compatible control
equipment is available from many sources - details are
included in Apollo publication PP1010, which is available
on request.
APPLICATION OF XP95 DETECTORS
The choice of detector from the XP95 range follows the
well established principles of system design. That is, the
optimum detector type will depend on the type of fire risk
and fire load, and the type of environment in which the
detector is sited.
For general use, smoke detectors are recommended since
these give the highest level of protection. Smoke detectors
from the XP95 range may be ionisation, optical or
multisensor types. It is generally accepted that ionisation
types have a high sensitivity to flaming fires whereas
optical detectors have high sensitivity to smouldering fires.
As a result of this, ionisation types are widely used for
property protection, and optical types for life protection.
These general principles still apply to XP95 detectors
although the availability of a multisensor in the range
offers more choice to the system designer.
The multisensor is basically an optical smoke detector and
will therefore respond well to the smoke from smouldering
fires. The detector also senses air temperature. This
temperature sensitivity allows the multisensor to give a
response to fast burning (flaming) fires, which is similar to
that of an ionisation detector. The multisensor can
therefore be used as an alternative to an ionisation detector
Where the environment is smoky or dirty under normal
conditions, a heat detector may be more appropriate. It
must be recognised, however, that any heat detector will
respond only when the fire is well established and
generating a high heat output.
Unless otherwise specified, devices described in this guide
are suitable for indoor use only.