DIN EN 54-28:2016-07

This European Standard has been prepared by Technical Committee CEN/TC 72 "Fire detection and fire alarm systems", the secretariat of which is held by the BSI (United Kingdom) and supervised at the national level by Working Group NA 031-02-01-13 AK "Brandmelder Gruppe B" ("Fire detectors Group B") of Working Committee NA 031-02-01 AA "Brandmelde- und Feueralarmanlagen" ("Fire detection and fire alarm systems") of DIN Standards Committee Firefighting and Fire Protection (FNFW). Non-resettable line-type heat detectors (NLTHD) have been used for a considerable number of years and are incorporated into fire detection systems and in some countries even into fire alarm systems if accepted by the relevant authorities. These detectors are typically used in areas where point type heat detectors are presented with challenging environmental characteristics and also, where access to the detectors, may significantly influence the fire alarm system design. This standard defines the minimum system functionality for NLTHD products. Due to the various applications for NLTHD, it is necessary to devise separate environmental classification tests for the sensing element and the sensor control units of these systems. It is not the purpose of this standard to define applications or how NLTHD should be used in applications. Generally NLTHD operate on using the same basic principle. However, they can have different performance with respect to the temperature response. Therefore they have been differentiated by a type code which reflects the nominal alarm temperature, the tolerance range and the maximum ambient temperature at which they could be used. This European Standard applies to non-resettable (digital) line-type heat detectors consisting of a sensing element using an electrical sensor cable which can be connected to a sensor control unit or either directly or through an interface module to a control and indicating equipment intended for use in fire detection and fire alarm systems installed in and around buildings and civil engineering works. The non-resettable sensing element has a fixed temperature alarm threshold and does not distinguish between short circuit and alarm condition. This European Standard also covers non-resettable line-type heat detectors intended for use in the local protection of plant and equipment. Non-resettable line-type heat detectors with special characteristics and developed for specific risks are not covered by this standard. This European Standard specifies the requirements and performance criteria, the corresponding test methods and the assessment of the conformity of the product with this European Standard. The system requirements and technical application rules are specified in DIN 14675 and DIN VDE 0833-2 (VDE 0833-2). Certification of conformity of non-resettable line-type heat detectors with the device requirements of this standard is governed by the assessment of conformity of the products by "Notified Bodies" in accordance with the EU Construction Products Directive (see Annex ZA).