VDOT-ASD-100 Aspiration Detector
Velocity Detection
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VDOT-ASD-100 Aspirating Smoke Detector User’s Manual V1
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Device Control: Reset, Isolate, Silence, Test, Scan,
The GPI terminal can be connected to a remote button, a control/output module of the
fire alarm system, or a PLC so those control function can be performed remotely, or by
other systems.
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Power Fault Monitoring: Mains Fault, Battery Fault, Power Fault
It is sometimes required by local code that the fault status of the mains and/or battery
condition of the detector’s power supply should be monitored. In this case, the ASD
detection device will signal a fault when the connected relay of power supply is
activated. The ASD fault condition can then be monitored by a fire alarm system when
its fault relay is connected the fire alarm system input module.
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Sensitivity Change: Sensitivity Mode 1, Sensitivity Mode 2
In some applications, the detection area environment background smoke level is
different in a day. For example, in work hours the background smoke level is usually
higher than the non-working hours. Sometimes, outside pollutants go into the
detection area can generate false alarm. There are needs to decrease the sensitivity to
prevent the false alarm or increase the sensitivity to provide better protection in a daily
basis or in certain situations. In this case, the GPI can be connected to a button, a timer,
a PLC or even a relay output of other ASD detector sensing the pollutant level from
outside, so that that sensitivity adjustment can be made manually or locally.
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User Defined Device Monitoring: UDI-1, UDI-2, UDI-3, UDI-4, UDI-5
The UDI, User Defined Input is usually used to monitor the status (relay) of other detection
device, like gas sensors, temperature sensors, or other aspirating smoke detectors.
The GPI-1 on the VDOT-ASD-100 termination board is a monitored contact with a 10KΩ
terminal resistor connected at the factory. When the GPI-1 is used, the terminal resistor
needs to be moved to the end of the line. When the line connected to the GPI-1 is shorted,
the device reports a GPI-1 alarm; when the line connected to the GPI-1 is open, the device
reports a GPI-1 fault.
The GPI-2 on the VDOT-ASD-100 terminal board is an active input with monitoring contact,
