System Sensor BS5839 Drift Compensation and Smoothing, 5251REM, 5251EM and 5251HTEM Heat Sensors

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System Sensor Intelligent Product Range

DRIFT COMPENSATION AND SMOOTHING

Drift Compensation and Smoothing eliminate nuisance alarms and provide a consistent progressive alarm sensitivity threshold throughout the period between service intervals.

In many instances this will result in an improved economic performance through savings in the cost of maintenance by extending the detector cleaning interval.

Intelligent sensors incorporate enhanced digital signal processing, eliminating spurious peaks.

5251REM, 5251EM AND 5251HTEM HEAT SENSORS

The 5251 range of static element and “rate of rise” temperature sensors provide solutions for a wide range of applications.

The 5251EM and 5251HTEM are fixed temperature analogue addressable sensors employing low mass thermistors and microprocessor technology for fast response and linear temperature sensing. Their linear response allows these sensors to be used to signal temperatures over the range of 58°C (Class A1S) to 78°C (Class BS).

The 5251REM uses the same thermistor and microprocessor technology to provide an alarm when the rate of rise

in temperature exceeds 10°C/minute (typical) or if the temperature exceeds a threshold of 58°C (Response Class A1R).

5251REM is approved to EN54-5: 2000 Class A1R

5251EM is approved to EN54-5: 2000 Class A1S

5251HTEM is approved to EN54-5: 2000 Class BS

Specifications

 

Height:

51mm in B501 Base

Weight:

102g excluding base

Effects of Drift Compensation

value

Adjusted thresholds

Maintenance levels

Sensor

Analogue sensor value

 

 

Low fault threshold

Time: years

Processed versus Unprocessed Signals

Processed

Unprocessed

PW4 µs

Time: hours

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Note: This document is based on the recommendations of BS5839 Part 1: 2002. It is intended only as a guide to the application of fire detection systems.

Reference must be made to relevant national and local standards.

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Contents Guide to intelligent fire systems Guide to Intelligent Fire Alarm Systems ContentsGuide to Intelligent Fire Alarm Systems Intelligent Fire Alarm SystemsIntelligent Fire Alarm Systems Decimal address switches System Fault ToleranceAddressing Methods Dedicated address programmerFire System Zones Intelligent Fire Alarm SystemsPRE-ALARM Facility Programming of Intelligent Fire Alarm Panels Remote LedsInterface Modules Advantages of Intelligent SystemsGuide Detector Application GuideFire System Categories Category M SystemsApplication Guide Manual Call Points 1. Manual Call Point PositioningSelection of Automatic Fire Detectors Fixed temperature detector 58C Rate of rise heat detectorAreas subject to rapid changes During normal useLocation and Spacing of Automatic Fire Detectors Ceiling HeightDetector type To EN54-7 10.5m Heat detector conforming toSloping Ceilings CorridorsCorridor being 7.5m and 5.3m respectively Voids and False Ceilings Lantern LightsLocation and Spacing of Optical Beam Detectors Audible Alarm Signals Visual Alarm SignalsMaintenance of Fire Detectors Codes and standards in the UK BS5839 Part 12002, SectionSeries 200 Plus Features General SpecificationsIntelligent Product Range Series 200 Plus Analogue Addressable Detector RangeWeight System Sensor Intelligent Product Range2251EM Photoelectric Smoke Sensor 2251TEM PHOTO-THERMAL SensorDrift Compensation and Smoothing 5251REM, 5251EM and 5251HTEM Heat SensorsRemote Test Switch 6500S Beam DetectorLaser Detector Operating Temperature -10C to 55CWeight 142g With LED blink enabled 2251EIS Intrinsically Safe Detector and IST200 InterfaceB500 Series Bases Weight 100g Interior diameterExterior diameter DepthM200 Series Module Range M200XE Short Circuit Isolator ModuleSpecifications Max Standby Current, externally powered zone M201E Output Module5A at 250VAC M210E-CZ Conventional Zone ModuleAccessories Call PointsIndoor Indoor products are generally rated at IP24DAudio Visual Products Detector Base SoundersSounder Strobes Majority of back box formatsOther Information Other Information Approval Bodies for Fire Detection ProductsAvenue Hoch Paris, France Tel +33 1 53 89 00 Jernholmen DK-2650 Hvidovre Denmark Tel +45 36 349System Sensor Fire Detectors Volochaevskaya Str 40, BldTelephone + 7 095 Telephone + 91 124 Fax + 7 095

BS5839 specifications

System Sensor BS5839 is a standard that pertains to fire detection and alarm systems, providing guidelines for the design, installation, and maintenance of these essential safety tools. It is crucial for safeguarding lives and property, ensuring that fire detection systems are effective and reliable. The BS5839 standard, established in the UK, covers a wide range of fire alarm system types, including conventional, addressable, and wireless systems.

One of the main features of BS5839 is its comprehensive classification of fire detection systems. The standard divides systems into categories based on the level of risk and the environment in which the system will operate. This classification helps ensure that the system installed meets the specific needs of the building and its occupants. For example, Category L systems are meant for life safety, while Category P systems are designed to protect property.

The technologies underpinning BS5839 include various types of detectors, alarm devices, and control panels. Smoke detectors, heat detectors, and multi-sensor detectors are prominent among the devices specified in the standard. Smoke detectors use photoelectric or ionization principles to detect smoke and signal an alarm, while heat detectors respond to temperature changes. Multi-sensor detectors combine both smoke and heat detection technologies to provide a more reliable response to fire conditions.

Another key characteristic of BS5839 is the emphasis on regular testing and maintenance. The standard outlines procedures to ensure that systems remain operational and effective over time. This includes routine system checks, functional testing, and more in-depth inspections at regular intervals. Ensuring that systems are maintained according to BS5839 is vital for compliance with insurance requirements and for safeguarding against potential legal liabilities.

Furthermore, BS5839 highlights the importance of staff training and awareness. It emphasizes that personnel responsible for fire safety must be adequately trained in the operation and response to fire alarm systems. This ensures that in the event of a fire, occupants are prompted to take appropriate action and evacuate safely.

In summary, System Sensor BS5839 provides a crucial framework for fire detection and alarm systems. Its classification of systems, incorporation of advanced technologies, and emphasis on maintenance all contribute to enhanced safety and compliance, protecting lives and property effectively.
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