OVERVIEW
NGA-501 is an Analogue Addressable Manual CAll Point,
designed and manufactured comply with EN54-11, compatible
with Nortech Addressable Control Panels. With its enhance
commuication mechanism the typical response time, when in
alarm is approximately one second, depending on the number
of call points connected to the device loop.
A bi-colour LED flashes Green when the unit is interrogated by the control panel and is illuminate Red
when in alarm. The command to illuminate the Red LED is emitted by the control panel in response to
activation of the individual call point thus confirming that the alarm signal has been received at control
panel.
The unit is supplied complete with hinged flap which protects the trigger element from accidental activation and reduces malicious activations as two actions are required in order to activate device. this
unit can be booth surface and flush mounted and it can be easily reset using the supplied key after activation.

The NGA-504 ASB is a wall mounted Addressable Sounder /
Beacon with low power consumption. Up to 32 individually
addressed sounders can be installed per loop occupying
address 94 to 125. The address is set using switches 1 to 5 of
the 8 way DIL switch. Four different tones are available and
selected using DIL switches 6 and 7.
SPECIFICATION
When individual address reporting is not required, NGA-504 ASB can be configured as a Shadow
sounder. In this case sounders do not occupy and address i nthe loop thus freeing up addresses for
more detection devices. Shadow sounders do not report back to the control panel so their presence on
the loop is not monitored. Shadow sounders draw current from the loop (10mA in alarm) and must be
included in loop load calculations.