VDOT-ASD-400 Aspiration Detector
Velocity Detection
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VDOT-ASD-400 Aspirating Smoke Detector User’s Manual V1
Specification
Smoke Detection Principle
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Forward Light Scattering Mass Detection
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High Power Blue LED
Smoke Sensitivity
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Smoke Detection Range: 0.001~25%/m
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Alarm Sensitivity Range: 0.005~20%/m
Sampling Pipe
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Material: ABS/UPVC
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OD: 25mm
Maximum Pipe Length and Sampling Holes
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EN54-20 Class A: Maximum 40 holes totally
4x100m (4x10 holes)
3x100m (3x13 holes)
2x100m (2x20 holes)
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EN54-20 Class B: Maximum 60 holes totally
4x100m (4x15 holes)
3x80m (3x20 holes)
2x60m (2x25 holes)
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EN54-20 Class C: Maximum 100 holes totally
4x60m (4x25 holes)
*Note
：
Please refer to Velocity ASD Design manual for the relationship between pipe length and the
number of sampling holes.
The ASDFlow air sampling pipe network design tool can be used to calculate the maximum
transport time and sampling hole sensitivity.
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Important Note:
Operation of the Detector beyond 12%/m obscuration is not allowed per the National Fire
Alarm Code (NFPA 72) guidelines.
