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The aerosol concentration shall then be increased at an appropriate rate, depending upon the detector’s sensitivity. The rate of increase in aerosol density shall be similar for all measurements on a particular detector type. It is recommended that the alarm signal is generated between 2 min and 10 min after the start of the measurement. Preliminary testing may be necessary to determine the appropriate rate for a particular detector type. e) the range of compensation is limited such that, throughout this range, the compensation does not cause the response threshold value of the detector to exceed its initial value by a factor greater than 1,6. Config A” means the worst case configuration for the Class A testing; “Config B” means the worst case configuration for the Class B testing; “Config C” means the worst case configuration for the Class C testing;
The ratio of the response threshold values Nmax : Nmin shall not be greater than 1,6. 6.9 Sulfer dioxide (SO2) corrosion (endurance)
EN 54-7:2000, Fire detection and fire alarm systems – Part 7: Smoke detectors – Point detectors using scattered light, transmitted light or ionization The ratio of the response threshold values Nmax : Nmin shall not be greater than 1,6. 6.7 Damp heat, steady state (operational) Where an aspirating smoke detector has multiple sensitivity settings, the sensitivity of the DUT during all tests in Table 3 (with the exception of the fire sensitivity test in 6.15) shall be set at the highest sensitivity setting used during the fire sensitivity test(s). The details of the supply and monitoring equipment and the alarm criteria used shall be given in the test report.
In mathematics, a percentage is a number or ratio that represents a fraction of 100. It is one of the ways to represent a dimensionless relationship between two numbers; other methods include ratios, fractions, and decimals. Percentages are often denoted by the symbol "%" written after the number. They can also be denoted by writing "percent" or "pct" after the number. For example, 35% is equivalent to the decimal 0.35, or the fractions . The specimen shall be monitored during the transition to the conditioning temperature and during the conditioning period to detect any alarm or fault signals.
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Musk first disclosed his stake in the social media giant on April 4. He later landed a seat on the company's board of directors before reversing those plans. 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) The type, quantity and arrangement of the fuel and the method of ignition are described in Annexes B to H for each test fire, along with the end of test conditions and the required profile curve limits. For convenience the EOT conditions are summarized in Table 5: Aspirating smoke detectors developed for the protection of specific risks that incorporate special characteristics (including additional features or enhanced functionality for which this standard does not define a test or assessment method) are not covered by this standard. The performance requirements for any special characteristics are beyond the scope of this standard. Where an aspirating smoke detector has a facility to memorize the “normal” flow (present when the detector is installed or serviced) and thereafter monitor for deviations from this normal flow, the action of setting the memorized “normal” flow shall be a voluntary action under level 3 access (as defined in EN 54-2).
No alarm or fault signals shall be given during the period in which the temperature is decreasing to the conditioning temperature or during the conditioning period, except as required by the tests in the last hour.
EMC immunity tests shall be carried out as described in EN 50130-4:1995. This will mean conducting the following tests: In both cases a period of 300 s is allowed between the fault being applied and the fault signal being given. The specimen shall be mounted as described in 6.1.3 and shall be connected to its supply and monitoring equipment as described in 6.1.2. The test apparatus and procedure shall be as described in EN 60068-2-2, Test Bb, and as described in 6.5.2.2 to 6.5.2.7.
the DUT shall be set up at a Test flow rate (Ft = Fn+/-10%) for testing the airflow monitoring. For a DUT that has a memorised normal flow the Ft shall be entered to the memory in accordance with the normal operating instructions for the DUT. This shall only be done once at the start of each environmental test and shall not be done during or after conditioning; NOTE Certain types of detector contain radioactive materials. The national requirements for radiation protection differ from country to country and they are not therefore specified in this standard. The ratio of the response threshold values Nmax : Nmin shall not be greater than 1,6. 6.13 Vibration, sinusoidal (endurance) 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, To show that the detector has adequate sensitivity to a broad spectrum of smoke types as required for general application in fire detection systems for buildings and other applications as applicable to the class of detector.
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Power cycling the aspirating smoke detector (turning it off and on) shall not result in a change to the memorized normal flow. The specimens shall be subjected to test fires (as defined in Annexes B to H) in accordance with Table 4. To ensure the reliability of the detector, the following requirements for software design shall apply: a) software shall have a modular structure, The test apparatus and procedure shall be as described in EN 60068-2-78, Test Cab , and as described in 6.8.2.2 to 6.8.2.5.
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