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.

NGA – 800 is a single loop Analogue Addressable control panel
which can be expanded to two loops. It provides a cost effective
solution for small to medium sized installations. NGA – 800 can
support up to 125 addressable devices on each loops.
Using Nortech advanced communications mechanism, up to
32 individually addressed Loop sounders can be connected to
each of NGA – 800 detection Loops.
The panel is equipped with a backlit LCD display of 4 rows each with 40 characters to give clear textual
indications of fire / fault occurences to the end user. /there are also 16 Zone Fire LED indicators.
NGA – 910 Repeaters and MIni-repeaters can be connected via an RS422/RS485, Fibre Optic or
TCP/IP interface to facilitate remote display and control of the system.
An interactive graphic representation of the system can be displayed on the user’s computer via
NGA-905 graphical software (optional). All the devices on the system can be displayed on a building
plan showing their status in real time. In the event of fire or fault the customer can control the system
and access all the necessary inforamtion with a few mouse-clicks.
Automatic Device Detection at start up reduces time spent at the commissioning stage. In Installation
mode NGA-800 detects and recognises addressed and connected devices with the system being fully
operational in less than two minutes.
The default programming ensures that the system is ready to detect Fire/ Fault alerts from the moment
that power is applied. Additional programming to customise the system can be implemented using a
laptop PC running the NGA – 900 connector software.