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The Break glass fire alarm manual emergencycall point for fire alarm system and access control system
The ‘break glass’ accounts and distribution procedures should be documented and tested as part of implementation. CO fire detectors are electronic detectors used to indicate the outbreak of fire by sensing the level of carbon monoxide in the air. Carbon monoxide, usually known by its chemical formula CO, is a poisonous gas produced by combustion. They are not the same as CO detectors used for home safety which are used to protect residents against carbon monoxide produced by incomplete combustion in appliances such as gas fires or boilers.
Voice alarm systems should be tested weekly in accordance with BS5839 Part 8. If the system is connected to an Alarm Receiving Centre (ARC) for calling the fire brigade, it is very important that the ARC is notified before testing commences and when it is complete Signals from the optical smoke chamber and temperature sensor are independent, and represent the smoke level and air temperature respectively in the vicinity of the detector; the detector’s micro controller processes both signals. The temperature signal processing extracts only rate of rise information for combination with the smoke signal. The detector will not respond to slow increases in temperature but a large sudden change can cause an alarm without presence of smoke, if sustained for 20 seconds. The processing algorithms in the multi-sensor incorporate drift compensation. Points to consider
The inspection and servicing should be undertaken by organisations with the appropriate competence. This can be assured by the use of organisations that are third party certificated, by a UKAS accredited certification body, specifically to carry out inspection and servicing of fire detection and fire alarm systems. Electronic solid state sounders with mono or multi tone output normally in the range of 800 – 1000 Hz. Proven time served reliability with a feature set that offers significant user benefits to the customer This information is provided for the general guidance of fire detection and fire alarm system users. As it is a summary, it omits much of the information included in BS5839 part 1. It is therefore not intended to be a replacement for the detailed recommendations included within British Standard. Routine testing by the userNo British Standard exists specifically for this item and indicating panels. A diversion relay permits the audible signal until the system is reset. Self Contained Fire Alarm Units Altering the environment – you might be tempted to put headphones in whilst the testing is being carried out, unfortunately, you shouldn’t do this. Panels are fully specified in British Standards. This requires that circuits are monitored continuously and that both audible and visual indication is provided for fault and fire alarm conditions. Further requirements include that alarm sounders may only be silenced manually, after which the control panel must provide audible and visual signals until the system is reset. Silencing of alarm sounders must not prevent the alarm being raised in other zones. It should be noted that the standards require all fault/alarm indicator lamps to be in duplicate or a single lamp with audible signal of lamp failure. Control and indicating panels may include facilities for operation of ancillary services such as fixed fire extinguishing, door closing etc.
The glass works to protect the fire alarm from accidental activations. However, these alarms are activated by a pressure switch, which is why glass is incorporated into the trigger. When the glass fails or breaks, the switch will be triggered, the signal will be sent to the alarm panel, and the sound will go off. In addition to government legislation, byelaws and local policy documents exist, created by local authorities at both district and county level, demanding the installation of fire alarm systems. These vary from area to area and advice must be sought from the appropriate local authority on any regulations in force. British Standards Relating to Fire Alarms It is not the object of this note to consider the details of different circuit types or to discuss their relative merits. Types of Fire Alarm SystemsFire detection and fire alarm systems for buildings. Code of practice for the design, installation, commissioning and maintenance of voice alarm systems
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