System Sensor BS5839

22 Note: This document is based on the recommendatio ns of BS5839 Part 1: 2002. I t is intended only as a guide to the ap plication of ﬁre detection systems.

Reference must be made to relevant national and local stan dards.

System Sensor Intelligent Product Range

7251 LASER DETECTOR

The Pinnacle high sensitivity laser ba sed intelligent smoke

sensor is a unique offering from Syst em Sensor that provides

extremely high sensitivity to ﬁre c onditions, by detecting the

earliest particles of combustion. T his is achieved by combining

a patented optical chamber with the late st in laser diode and

precision optics technology, which enhances t he sensitivity

of the device. The chamber is also linked to sophis ticated

processing circuitry that incorp orates smoothing ﬁlters to help

eliminate transient environmental noi se conditions, which

can be the cause of unwanted alarms. The resu lt is a very

sensitive but stable sensor that can ac hieve sensitivities of

0.006% to 0.6% per metre obs curation and provides up to 100

times more sensitivity than a stan dard photoelectric smoke

sensor. With its quick response and pinpoint ac curacy, this

unique sensor is ideally suited to environmen tal applications

where there is substantial cost for d owntime or a signiﬁcant

investment in installed equipment has bee n made (e.g.

Electronics Manufacturer Clea n Rooms, Telecommunication

Rooms, Computer Rooms etc.) .

The sensor’s performance is improved even f urther by the

inclusion of special drift compensat ion algorithms, which

compensate for the build up of contaminat ion in the sensing

chamber. There are three stages of drift co mpensation, ‘low

level alert’, ‘high level alert’ and ‘maintenanc e urgent’. The

‘low and high level alert’ signals are used to ide ntify that

the Pinnacle sensor has accumulated signiﬁc ant amounts

of airborne particles and requires ma intenance, whilst the

‘maintenance urgent’ signal indicates t hat the sensor has

reached the end of its compensation rang e.

Tested and approved to EN54-7: 2000

Speciﬁcations

Operating Voltage: 15 to 32VDC

Max Standby Current: 230µA at 24VDC (No communi cations)

Operating Temperature: -10°C to 55°C

Weight: 142g