Performance Requirements HSSD (High Sensitivity Smoke Detection) detectors shall be capable of achieving the sensitivity required to meet or exceed the sensitivity and pass all fire tests described in EN54 part 9 with a sampling hole dilution ratio of 99:1. Evidence of this shall be provided at time of offer, in the form of an LPCB Test Report or equal and approved. Resistance to unwanted alarms is of paramount importance. The system shall incorporate advanced statistically based signal processing techniques proven to reduce unwanted alarms. Each detector shall utilise a system of Artificial Intelligence to ensure a consistent level of protection by constantly varying its operating parameters to match environmental changes within the protected area. The detector shall continuously monitor all internal and external components, and signal warning in the event of any malfunctions including; filter contamination, detection chamber operation, air flow in sampling pipes outside normal limits, microprocessor functioning correctly, power supply, etc. The detector shall incorporate a dual technology system for the automatic discrimination of signals from non-fire related sources such as dust. The system shall automatically adjust itself to eliminate any deterioration in performance caused by a build up of contamination.

Detector Construction The aspirating system shall be manufactured in Europe within an ISO 9001 quality environment. These ISO 9001procedures shall be independently audited by the LPCB. The laser detector chamber, aspirator, and control electronics shall be housed in a single purpose designed metallic cabinet finished in a neutral colour. Multi-channel detectors shall incorporate individual laser detector chambers for each channel housed in a single enclosure. These chambers shall be electronically monitored to constantly maintain protection to all areas irrespective of whether the system is in quiescent or alarm condition. Each channel shall have the facility to be programmed with different operating parameters. Where detectors are connected to each other in a network configuration each detector should have facilities for the provision of electrical isolation from both open and short circuit loop faults. Network communications should be serial RS485 incorporating full error checking.