AS ISO 7240.8:2018 pdf free
AS ISO 7240.8:2018 pdf free.Fire detection and alarm systems
If a test method requires a specimen to be operational, then the specimen shall be connected to suitable supply and monitoring equipment with characteristics as required by the manufacturer’s data. Unless otherwise specified in the test method, the supply parameters applied to the specimen shall be set within the manufacturer’s specified range(s) and shall remain substantially constant throughout the tests. The value chosen for each parameter shall normally be the nominal value, or the mean of the specified range. If a test procedure requires a specimen to be monitored to detect any alarm or fault signals, then connections shall be made to any necessary ancillary devices (e.g. through wiring to an end-of-line device for non-addressable detectors) to allow a fault signal to be recognized.
Install the specimen for which the CO response value is to be measured in a gas test chamber, as specified in Annex A, in its normal operating position, by its normal means of attachment. The orientation of the specimen, relative to the direction of gas flow, shall be the least sensitive orientation as determined in the directional dependence test (see 5.3), unless otherwise specified in the test procedure.
For detectors whose response is rate sensitive, the manufacturer may specify a rate of increase within this range to ensure that the measured response value is representative of the static response value of the detector. The rate of increase in CO concentration shall be similar for all measurements on a particular detector type.
Introduce carbon monoxide gas at a rate of between 1 μl/l/min and 6 μl/l/min until the specimen has entered an alarm state. For detectors whose response is rate sensitive, the manufacturer may specify a rate of increase within this range to ensure that the measured response value is representative of the static response value of the detector.AS ISO 7240.8 pdf free download.
