Chapter 2: Product description
8 Stratos EX Hazardous Area Aspirating Smoke Detection System Installation Manual
Introduction
The EX detector is a highly sophisticated “next generation” high sensitivity
aspirating smoke detection product that provides all the benefits of air sampling
high sensitivity smoke detection, including very early warning. Designed for easy
installation and commissioning, the EX detector incorporates a patented “artificial
intelligence” known as ClassiFire, which allows the detector to configure itself to
optimum sensitivity, alarm thresholds, and minimum nuisance alarms for various
environments.
The EX detector operates by drawing air from a protected space via a supervised
piping network in relatively small areas. The sampled air is passed through a
“dust separator” to remove dust and dirt before entering the laser detection
chamber. Sophisticated, state of the art electronics are used to analyze the
sampled air and generate a signal representing the level of smoke present.
ClassiFire intelligence also monitors the detector chamber and dust separator
(filter) for contamination, continually adjusting the appropriate operating
parameters to counteract the negative effects of any contamination. Aspirating
smoke detectors are unique in being able to provide a consistent level of
protection in a very wide range of environments by continuously making minor
adjustments to sensitivity.
The aspirating line of detectors detects “difficult-to-detect” slow growth electrical
overload incipient fires in “difficult” environments.
This equipment is Class 111 as defined in EN 60950 (i.e., this equipment is
designed to operate from Safety Extra Low Voltages and does not generate any
hazardous voltages).
The EX detector is housed in a Groveley Engineering flameproof enclosure
(certificate No. DEMKO028TEX131598) which is fitted with Knitmesh flame
arrestors (certificate No. EPSILON06ATEX2138U) at the sample inlet and
exhaust ports. The detector features dual high pressure aspirators to overcome
the flow restriction of the Knitmesh flame arrestors and provide excellent air
sampling performance. The use of two aspirators provides an element of
redundancy as the system will continue to sample in the unlikely event of an
aspirator failure.
For ease of maintenance the air filter is mounted external to the main detector in
a separate stainless steel enclosure. The filter housing does not contain any
electrical equipment and so it can be opened for filter replacement without
compromising the flameproof protection of the system.
The light weight of EX detector (8.5kg) makes installation a simple and safe one-
man operation, with no special lifting equipment required.
The networking capabilities of EX detector permit the use of remote displays and
other standard accessories. Programming of an EX detector system can be
undertaken using the SenseNET system located in a safe area.
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