BS EN 54-5:2017 pdf free
BS EN 54-5:2017 pdf free.Fire detection and fire alarm systems Part 5: Heat detectors – Point heat detectors.
4 Product characteristics
4.1 General
4.1.1 Heat Response Categories
Detectonarecategmlaedbyoneormoreofthebllowlngheatresponsecategodes:A1.A2.B,C.
ft E. F or G according to the requirements o(the tests specified In Clause S (see Table 1).
Manufacturers may optionally give additional information concerning the type of response exhibited by the detector, by adding the suffix S or R to the above categories’). Detectors, which are marked with the letter S or R as a suffix to the category marking, shall be tested in accordance with the applicable test, specified in 5.4.1 or 5.4.2, and shall meet the requirements of that test, in addition to the tests of Clause 5. Addition of a suffix shall be regarded as creating a new category.
4.2 Operational reliability
4.2.1 Position of heat sensitive elements
The heat sensitive element(s) or at least part of it, except elements with auxiliary functions (e.g. characteristic correctors), shall be at a distance 15 mm from the mounting surface of the point heat detector. To confirm this, the point heat detector shall be tested in accordance with 5.2.1.
4.2.2 IndIvidual alarm Indication
4.2.2.1 Category Al, A2, B, C or D point heat detectors shall be provided with an integral red visual indicator, by which the individual point heat detector, which released an alarm, can be identified, until the alarm condition is reset. Where other conditions of the point heat detector can be visually indicated, they shall be clearly distinguishable from the alarm indication, except when the point heat detector is switched into a service mode. For detachable point heat detectors the indicator may be integral with the base or the point heat detector head. The visual indicator shall be visible from a distance of 6 m directly below the point heat detector, in an ambient light intensity up to 500 lx. To confirm this, the point heat detector shall be assessed in accordance with 5.2.2.1
4.2.2.2 Category E, F or G point heat detectors shall be provided with either an integral red indicator, or with another means for locally indicating the alarm status of the point heat detector. To confirm this, the point heat detector shall be assessed in accordance with 5.2.2.2
NOTE The alarm condition is reset manually at the control and indicating equipment (see EN 54—2).
4.2.3 Connection of ancillary devices
Where the point heat detector provides for connections to ancillary devices (e.g. remote indicators, control relays), open- or short-circuit failures of these connections shall not prevent the correct operation of the point heat detector. To confirm this, the point heat detector shall be assessed in accordance with 5.2.3.
4.2.4 Monitoring of detachable detectors
For detachable point heat detectors, a means shall be provided for a remote monitoring system (e.g. the control and indicating equipment) to detect the removal of the head from the base, in order to give a fault signal. To confirm this, the point heat detector shall be assessed in accordance with 5.2.4.
4.2.5 Manufacturer’s adjustments
It shall not be possible to change the manufacturer’s settings except by special means (e.g. a special code or tool, or by breaking or removing a seal). To confirm this, the point heat detector shall be assessed in accordance with 5.2.5.
42.6 On-sIte adjustment of response behaviour
If there is provision for on-site adjustment of the response behaviour of the point heat detector then:
— for each setting, at which the manufacturer is stating a corresponding category, access to the adjustment means shall only be possible by the use of a code or special tool or by removing the point heat detector from its base or mounting;
— any other setting(s) which the manufacturer is not stating a corresponding category in accordance to this standard, shall only he accessible by the use of a code or special tool, and it shall be clearly marked on the point heat detector or in the associated data.
To confirm this, the point heat detector shall be assessed in accordance with 5.2.6.
NOTE These adjLlstments can be carried out at the point heat detector or a the control and indicating equipment.BS EN 54-5 pdf download.
