New detectors offer unprotected ease of access for servicing

May 2000 Fire & Safety

Notifier South Africa boasts a range of highly sophisticated smoke detectors, including the LPX-751 Very Intelligent Early Warning (VIEW) Laser smoke detector and the FSI-751 and FSP-751/751T low-profile intelligent plug-in smoke detectors with FlashScan.

The LPX-751 intelligent/addressable devices

The Notifier LPX-751 VIEW Laser Detector provides a revolutionary advance in early warning smoke detection technology. The unique design of this detector, combined with enhanced AWACS algorithms in the Notifier AFP-400 control panel, allows smoke detection sensitivity that is 10-50 times higher than present photoelectric technology. Because of this high sensitivity, the LPX-751 can provide very early warning of slow smouldering fires.

Says Shane Nefdt, Regional Manager of Notifier South Africa, "Its performance is comparable to present aspiration technology, at a substantially lower installed cost."

The LPX-751 uses an extremely bright laser diode, combined with special lens and mirror optics, to achieve a signal-to-noise ratio that is much higher than traditional photoelectric sensors. In addition, the tightly focussed light beam, combined with the AWACS algorithms, allow the system to differentiate between dust and smoke particles. Because of this differentiation, the LPX-751 can be set to extremely high sensitivity, yet can reject false signals caused by larger airborne particles such as dust, lint and small insects.

The LPX-751 is an intelligent (analog/addressable) detector using standard Notifier protocol, and up to 99 detectors may be installed per AFP-300 or AFP-400 loop. It may be mixed in any combination with other Notifier intelligent sensors on the same loop and is quickly installed using the panel auto-program feature. The LPX-751 provides dual bi-colour LEDs, which blink green in normal operation and illuminate steady red in alarm.

Using the enhanced AWACS algorithms, the VIEW system (AFP-300/AFP-400/LPX-751) provides drift compensation (meeting UL requirements as a calibrated sensitivity meter), maintenance alert (three levels), selection of nine alarm levels and nine pre-alarm levels, and report of drift compensation used and recent peak values. The system includes a self-learn sensitivity adjustment to set the pre-alarm level just above the peak levels sensed over long periods of time for each detector's actual environment. The system includes multidetector algorithms (US patent pending) that permit one sensor to consider readings from adjacent sensors to provide faster detection of fires.

The NOTIFIER FSP-751 and FSI-751

The NOTIFIER FSP-751 (photo) and FSI-751 (ion) are analog, addressable, low-profile smoke detectors designed for the AFC-600 Fire Alarm Control Panel. The FSP-751T photo model includes a built-in thermal (heat) detection device. If either condition (smoke or heat) is detected, the device will alarm.

The FSI-751 Intelligent Ionisation Sensor incorporates a unique single-source chamber design to respond quickly and dependably to a broad range of fires. The FSP-751 Intelligent Photoelectric Sensor's unique optical sensing chamber is designed with superior signal to noise ratio. The optical chamber is engineered to sense the presence of smoke produced by a wide range of combustion sources.

FlashScan (patent pending) is a new communication protocol developed by Notifier Engineering that greatly enhances the speed of communication between analog intelligent devices. Intelligent devices communicate in a grouped fashion. If one of the devices within the group has new information, the panel's CPU stops the group poll and concentrates on single points. The net effect is response speed greater than five times that of earlier designs.

Says Nefdt, "These detectors are currently in use - both here in South Africa and abroad. They boast unprecedented ease of maintenance, making them the detectors of choice for hard-working installers and system integrators."

For details contact Shane Nefdt, Regional Manager of Notifier South Africa, on tel: (011) 363 2418, fax: (011) 363 2433 or e-mail: shanenefdt@mweb.co.za



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