Chapter 4: Commissioning
60 LaserSense HSSD-2 Aspirating Smoke Detector Installers Handbook
Transport time verification
The maximum transport time verification test is the measure of the amount of
time it takes for the detector to respond to smoke that enters the pipe at the
sampling point furthest from the Detector. The results of this test and the
calculated maximum transport time from PipeCAD must be recorded on the
checksheet. Measured transport time less than the calculated time is acceptable.
To measure the maximum transport time of the system:
1. Determine the furthest sampling point from the detector.
2. Allow test smoke to enter the pipe at the furthest sampling point.
3. Record the amount of time for the detector to respond. This is the actual
maximum transport time.
Gross smoke testing
The gross smoke test is a measurement of the amount of time elapsing from the
activation of the smoke generating medium, until Pre-Alarm 1 and Alarm 1 is
reached. This test should be repeated at least three times with consistent results.
Recommended smoke generating medium is aerosol simulated smoke or wire
burner.
Aerosol smoke spray
There are a number of commercially available aerosol smoke sprays or “canned
smoke.” Please refer to your supplier for a recommended product. When using
canned smoke, introduce only enough smoke into the protected area that will
cause an FIRE 1 condition. This may require a number of practice sprays. Follow
the manufacturer’s instructions.
Caution: Oil-based canisters that are used to test point detectors are not suitable
for testing aspirating systems, as the particulate is heavy and tends to drop out in
the pipe, never actually reaching the detector. Also, the oily residue that is left
behind may affect the functionality of the detector.
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