Chapter 5: Maintenance
LaserSense 100 Aspirating Smoke Detector Installers Handbook 41
Maintenance procedures
The following paragraphs outline general scheduled maintenance procedures to
be performed on an “as necessary” basis.
Caution: Risk of equipment damage. Always turn the power off before servicing
the detector.
Visual check
The visual check must be performed every six months. This check is to ensure
pipe network integrity.
To perform the visual check, observe the entire piping network and check for
abnormalities in the pipes, including any breaks, blockages, crimps, etc.
Gross smoke test
The gross smoke test is a Go/No-Go test which ensures that the detector
responds to smoke. This test must be performed at system commissioning and
every year thereafter. To perform this test, smoke must be introduced into the
last sampling hole in each branch of the pipe network and the proper response
must be verified by the detector. Smoke from a punk or cotton wick may be used.
Note: For cleanroom applications, consult with supplier for gross smoke test
methods.
Transport time verification test
The maximum transport time of the pipe network must be measured and
compared to the recorded transport time at commissioning. (Refer to “Transport
time verification” on page 34 of this manual for test details.) The transport time
verification test must be done at commissioning and every year thereafter.
Detector sensitivity test
The detector sensitivity test must be performed within one year of installation and
every alternate year thereafter.
Example:
• Year-one check
• Year-three check
• If years one and three are OK, go to five-year interval.
The detector employs a self-monitoring, automatically-adjusting calibration for the
system. The inspection only requires a periodic visual inspection for a detector
fault indication and performing the detector sensitivity test function.
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