User’s manual NX-4a Side 4
How to use the NX-4
NX-4 is normally used at night while sleeping. Flip the power switch to “ON” position and the red
“Heating” lamp will light. After a heating period of 2-2,5 minutes, the green lamp will light and NX-4
is ready. (Motion detectors will work immediately when NX-4 is switched on, but the alarm sounder
will no work until the green lamp is on).
The sensitivity of the three gas detectors must be adjusted before the NX-4 is ready for use. When the
heating period is over and the green lamp is on, turn the sensitivity knob slowly upwards until the
alarm triggers the sounder, then turn the knob approximately 2 scale marks backwards from the trigger
point. Repeat this procedure for all three detectors (Smoke, “Narcosis” and Propane. When this is done
there is rarely necessary to adjust it again other than for checking the alarm and sensitivity level
(should be done on regular basis). Hot weather, high air humidity and many people in the room may
require lower sensitivity settings.
Note: If the NX-4 has been out of use for a period of time or when it is powered for the first time, let it
be powered for a day or two and then readjust the sensitivity.
When many people are present, the air quality will generally be lower and this may cause the smoke
alarm (and sometimes the “Narcosis” alarm) to trigger if it first was adjusted in an environment with
fewer persons.
Too high sensitivity setting will cause the alarm to trigger unwanted. Too low sensitivity setting will
not totally disable the alarm, but a higher density of gas is required to trigger the alarm.
Every gas detectors have their own areas where they are the most sensitive (See the chapter about
“which gases does NX-4 detect”. Each detector has a separate indicator lamp in order to distinguish
the detector that sounds the alarm.
If outside mounted motion detectors are connected:
The motion detectors have two stages. The first is immediate and is triggered by the first sign of
motion and lights the outside lamps if installed. No alarm will sound at this stage. The next stage is
delayed and gives an audible inside alarm after a certain amount of time. The delay time is adjustable
with the Motion detector sensitivity adjustment knob inside the NX-4 (see the chapter “Adjusting the
sensitivity for the Motion Detectors”). The time delay is adjustable from approximately 6 to 30
seconds. Normal position is in the middle. If more than two motion detectors are connected, a lower
sensitivity setting is recommended.
If you are in an area where people normally are visiting and passing by, you do not want the alarm to
sound. Therefore the alarm volume is adjustable from full to no alarm at all. Set the alarm volume to
something in between if you want just a discrete notification that people are outside.
If outside lights are connected, the NX-4 may be left ON in order to provide the owners a “Welcome
light” when coming home at night. Also the automatically activated light will make burglars
uncomfortable and may prevent theft.
How to test the NX-4
The simplest test is just to turn the sensitivity adjustment knobs upwards (Clockwise) just until the
alarm sounds, then approximately two scale marks back. Do this test at regular basis. When doing this
test note if the trigger point is approximately two scale marks up from where the alarm sounds. (Two
scale marks is just a guideline. You may want less sensitivity, but rarely more). This way you will be
familiar with the environment influence on the alarm and you will not encounter false alarms.
A more thorough test is done with actual gas. The “Smoke” and narcosis detectors are located in the
NX-4 main unit. Open a bottle of alcohol, hold it 10-20cm from the unit and blow above the bottle
neck and against the unit. After a short while the alarm will sound and both “Smoke” and Narcosis gas
detectors shall react. The propane detector is tested by holding a gas lighter directly against the
opening of the detector aluminum housing and release a very short dose of gas without lighting flame.
The Propane detector shall react immediately.
Do this test at least once a year and always immediately after installation.
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