VDOT-ASD-400 Aspiration Detector
Velocity Detection
14
VDOT-ASD-400 Aspirating Smoke Detector User’s Manual V1
Cable entries are also provided on the side and bottom. It should be noticed that some cable
entries are non-cut through holes, a punch using a screwdriver and hammer or a proper tool
are needed to open the entry holes.
Sampling pipes
Sampling pipes should be made from a non-hazardous material and should be clearly identified.
Typical sampling pipes used in air sampling systems are ABS/uPVC pipes with 25mm OD. The pipes
should be marked with air sampling or aspirating smoke detection pipe to identify its usage. Red
pipe is recommended for it is a fire alarm system.
In some cases, high temperature or corrosion is a concern, metal or other materials suitable
materials for that environment can be used.
When drilling holes in the sample pipes, or cutting off lengths of pipe, ensure that all swarf and
debris is removed from the pipe.
