This device is designed to detect the presence of fire inside residential or commercial
buildings. It should not be installed in industrial premises. The battery-powered detector
has a built-in local warning siren combined with a red LED indicator.
The detector combines an optical smoke sensor with a heat sensor. Both sensors
have their outgoing signals processed digitally, resulting in higher false alarm
immunity. The optical sensor works using a light diffusion principle and is very
sensitive to the presence of large-sized particles which are characteristic of dense
smokes. By contrast, the sensor is less sensitive to small-sized particles which are
typical of cleanly burning fires. In particular, the smoke sensor is not capable of
detecting the by-products of cleanly-burning fluids such as alcohols, for instance.
This deficiency is compensated for by the built-in heat sensor. This sensor provides
a slower reaction when compared to the smoke sensor, but is much better at
reacting to fires with rapidly rising heat producing only a little smoke.
Smoke/heat sensor participation is configurable by DIP switches.
Detection range, detector positioning
Exposing fire conditions to the smoke and heat sensors requires some level of air
circulation. It is therefore necessary to install the SD-401 detectors in such a place
on the ceiling that (in the case of fire) smoke masses are forced to go in the direction
of the detector’s position. This can usually be achieved in most buildings. However,
the SD-401 is not suitable for installation in outdoor spaces or interiors with an
extremely high ceiling where fire by-products would not reach the detector position.
The following table shows the detector’s working range in relation to the height of
the ceiling on which the detector is installed. The range is expressed as the radius of
the circular fire detection area for a detector installed on a ceiling directly above.
Ceiling height (m)
< 4.5 4.5-6 6-8 8-11 11-25 > 25
Smoke
detection
7.5* m 7.5* m 7.5* m 7.5* m
Not
suitable
Not
applicable
Heat
detection
5* m 5* m 5* m
Not
suitable
Not
applicable
Not
applicable
Not applicable – meant for a particular ceiling height range
Not suitable –not usually used in such cases
* – the radius of the detection area below the detector
•Installation on a horizontal level ceiling
Due to the possible occurrence of a cold air layer right under the ceiling, the
detectors must not be imbedded into the ceiling
. The distance between any
point to be protected and an imaginary vertical line from the detector down to the
floor must not exceed the radius indicated in the table.
• Installation on a sloping ceiling
If the SD-401 is installed just under an apex formed by the joining of two sloping
ceilings the values indicated in the table can be increased by 1% for every degree of
slope up to a
maximum of 25%.
If the space to be protected is under a
saw-tooth
type of roof,
SD-401 detectors should be installed
under each apex
. However, a roof
with a shallow saw-tooth form can be acceptable if the height difference between the
highest and lowest parts of the ceiling does not exceed 5% of the total ceiling height.
•Walls, partitions, obstacles, and trussed ceilings
The SD-401
must not be installed closer than 0.5 m from any wall or
partition
. A narrow room with a width of less than 1.2m requires the detector(s) to
be placed at a distance of at least one third of the room’s width away. In the case
of separating walls (partitions, warehouse objects) which do not reach the ceiling,
the space is
considered to be fully separated if the gap between the top of
the separating wall and the ceiling does not exceed 0.3 m
. A free space of at
least 0.5m is required under the detector. Irregularities in ceiling shape which do
not exceed 5% of ceiling height are considered insignificant – the ceiling can be
regarded as being even and limits from the table are applicable.
However, any
irregularity (including beams) exceeding 5% of the ceiling height is
considered to be a wall with the consequences stated above
.
•Ventilation and air circulation
The detectors must not be installed directly by a fresh air inlet
, e.g. air
conditioning vents. In the case of air being supplied through a perforated ceiling, each
detector must be placed so that no perforation hole occurs within 0.6m of the detector.
•Avoid installing the detector in the following locations:
•
Places with poor air circulation (niches, corners, apexes of A-shaped roofs).
•
Places exposed to dust, cigarette smoke or steam.
•
Places with over-intense air circulation (close to ventilators, heat sources or air
conditioning outlets).
•
Kitchens and other cooking places (because steam, smoke or oily fumes can
reduce detector sensitivity).
Caution: The most common reason for the detector to be accidentally
triggered is improper detector location.
See CEN/TS 54-14 standard for detailed installation guidelines.
Installation and settings
Take the following steps:
1. Open the detector by turning the rear cover and remove the battery.
2.
Screw the rear cover
onto the desired location.
3.
Set the required function
via DIP switches
– see picture below.
4.
Insert the battery
and
close the detector
– put the detector’s body on the
fixed rear cover and turn it clockwise.
5. After installing a battery into the detector, allow approx. 15 seconds for stabilisation.
This period is indicated by the LED being continuously lit and is
followed by an
auto-test
. Successful performance of the auto-test is
confirmed acoustically
.
ON 3 OFF
1
OFF
Not used
4 OFF
Smoke (EN 14604) or
Heat (EN 54-5)
ON
Memory ON
3 ON
2
OFF
Memory OFF
4 OFF
Smoke only (EN 14604)
(heat indifferent)
3 OFF
4 ON
Heat only (EN 54-5)
(smoke indifferent)
3 ON
4 ON
Smoke and Heat
(both simultaneously)
Closing the detector is disabled if no battery has been installed!
Remove the battery for 1 minute whenever you change the DIP switch setting!
Fire alarm
Optical smoke sensor
: Smoke entry into the detector is indicated as a pre-alarm state by
the LED flashing. If the smoke threshold density is exceeded, a siren sound is generated,
gradually increasing in volume.
Heat sensor:
– indication logic is equal to that of the smoke sensor.
Alarm memory:
The detector alarm memory can be enabled by pressing and holding the
test button during battery installation up to LED light up. Alarm LED indication continues even
if normal conditions are restored. The indication can be stopped by pressing the button.
Silencing the siren during an alarm:
During a fire alarm, the detector LED flashes 2
times briefly and the built-in siren sounds (at a higher intensity than during a test). Under
these conditions the siren can be silenced by pressing the test button. However, if normal
conditions are not restored within approx. 10 minutes (the smoke does not clear from the
room or the temperature does not drop), the siren re-activates.
Testing the detector
The functioning of the detector can be tested by pressing and holding the
test button for approx. 3 seconds. A properly functioning detector responds
with one beep and a short flash. A fault is indicated by 4 beeps and the LED
permanently flashing. In this case, remove the battery and re-insert it after 1
minute. If the fault indication occurs again (the LED starts permanently
flashing after about 1 minute), consult the installer company.
The detector should be tested this way at least once in every 30 days.
Warning: Never start a fire in a building to test the detector. Instead, use
smoke-simulating aerosols aerosol testing equipment for realistic testing.
Battery replacement
The detector monitors its battery voltage and if too low, a short acoustic warning
signal is emitted every 45 seconds. Battery replacement should not be delayed by
more than two weeks. As mentioned above, the detector is automatically tested
after each battery insertion.
Expired batteries should not be thrown into the
garbage, but disposed of according to local regulations.
Specification
Voltage 1x AA 1.5 V alkaline battery
Power consumption – stand by/alarm 40 µA/250 mA
Battery lifetime typically 2 years
Smoke detection optical, light dispersion
Smoke sensor sensitivity m = 0.11 - 0.13 dB/m to EN 14 604
Temperature detection class A2 to EN 54-5
Fire-alarm temperature +60 °C to + 70 °C
Acoustic power of the built-in siren 85 dB / 3m A
Operational temperature range -10°C to +70 °C
Recommended date for replacement 6 years
Dimensions diameter: 126 mm, height: 65 mm
Complies with EN 14 604, A2 EN 54-5, EN 50130-4, EN 55022,
Jablotron Ltd. hereby declares that the SD-401 is in compliance with
the essential requirements and other relevant provisions of Directive
1989/106/EC. The original of the conformity assessment can be found on the web site
www.jablotron.com
, Technical Support section.
Note: Dispose of batteries safely
depending on battery type and local
regulations. Although this product does not
contain any harmful materials we suggest
you return the product to the dealer or
directly to the manufacturer after use.
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