VDOT-ASD-400 Aspiration Detector
Velocity Detection
35
VDOT-ASD-400 Aspirating Smoke Detector User’s Manual V1
o
Check the Power Supply (UPS)
a.
Check the DC input voltage using a meter to make sure the power is within normal range.
o
Check the Device Display
a.
Press the <Test> button (if it’s enabled) to check if all the LEDs on the display illuminates
normally.
o
Check the Air Flow
a.
Use VDOT-ASD-400 front panel display or Management System computer software to check and
record the airflow readings.
b.
Compare the reading to history record to see if there’s significant change. Airflow reading during
maintenance should be confirmed as ± 20% of the values measured at commissioning
c.
Inspect the sampling pipe to see if there is pipe breakage or hole blockage if there’s significant
change in readings.
o
End Cap Smoke Test
a.
Introduce smoke to the pipe end.
b.
Check the response time is within specification (typically 120 seconds) and compare this to
history record. Measurements of transport time from the furthest hole during maintenance
should be confirmed to be within ± 15% or ± 3 seconds, whichever is the greater, of the same
measurement taken at commissioning.
c.
Inspect the pipework if there’s significant change in the response time.
