The ratio of the response threshold values Nmax : Nmean shall not be greater than 1,33. The ratio of the response threshold values Nmean : Nmin shall not be greater than 1,5.

EN 60068-2-2, Basic environmental testing procedures; part 2: tests; tests B: dry heat (IEC 60068-2¬2:1974 + IEC 60068-2-2A:1976)The specimen shall be mounted as described in 6.1.3 to a rigid structure, as required by EN 60068-2¬75, and shall be connected to its supply and monitoring equipment as described in 6.1.2. EN 60068-2-78, Environmental testing – Part 2-78: Tests; Test Cab: Damp heat, steady state (IEC 60068-2-78:2001) This is either demonstrated by testing according to 6.4.2.1 or may be demonstrated by consideration of the electronic design of ASD and appropriate testing in accordance with 6.4.3. The manufacturer shall submit documentation to the testing authority which gives an overview of the software design. This documentation shall be in sufficient detail for the design to be inspected for compliance with this standard and shall include at least the following:

It shall not be possible to change the manufacturer’s settings except by special means (e.g. the use of a special code or tool) or by breaking or removing a seal. The specimen shall be monitored during transition to the conditioning temperature and during the conditioning period to detect any alarm or fault signals. The maximum and minimum of these six response threshold values shall be designated Nmax and Nmin respectively.component or series of components or dedicated device (e.g. a pipe network, dedicated duct, probe or hood) which forms part of the ASD and transfers samples of air to the smoke sensing element(s) A fault signal shall be given when the airflow is outside the operational limits as specified by the manufacturer in his data. b) where the tests of a) cannot be applied (e.g. where the volumetric flow is maintained constant), the flow monitoring facility is to be verified by the loss of maximum of the 50 % of sampling points. The sampling points lost shall be those furthest from the sensing element on the worst case sampling device used in the fire sensitivity test(s). Loss of the points shall be separately tested for: d) for any rate of increase in smoke density R, which is greater than A/4 per hour (where A is the detector’s initial uncompensated response threshold value), the time for the detector to give an alarm does not exceed 1,6 x A/R by more than 100 s, No alarm or fault signals shall be given during the period that the temperature is increasing to the conditioning temperature or during the conditioning period, except as required by the tests in the last hour.

b) it shall be possible to determine what sensitivity settings have been selected and to relate these to documentation which describes the sensitivity settings required for different sampling devices and applications; Before each test fire the room shall be ventilated with clean air until it is free from smoke, so that the conditions listed below can be obtained. The details of the supply and monitoring equipment and the alarm criteria used shall be given in the test report. To ensure the reliability of the detector, the following requirements for software design shall apply: a) software shall have a modular structure,Due to the inherent flexibility in the design of sampling devices, aspirating smoke detectors are generally intended for use in many varied and often rather specialized applications. Therefore it is not possible to conduct type tests that define acceptance criteria for all of these applications. However, in recognition of the diversity of application three classes are defined to enable system designers and installers to select the most appropriate sensitivity. EMC immunity tests shall be carried out as described in EN 50130-4:1995. This will mean conducting the following tests: If a specific tolerance or limit is not specified in a requirement or test procedure, then deviation limits of ± 5 % shall be applied. The response threshold value of each of the test specimens shall be measured as described in 6.1.5.