Datasheet

DATA SHEET
Technical changes reserved
0141 0316-145 07/2014
PIR motion alarm module
Working principle:
PIR motion alarm unit operates with the help of pyroelectric sensors,
which have maximum sensitivity in the range of heat radiation from
living bodies. At 37°C body temperature, the spectral sensitivity lies
between 7 and 14 µm. In the internal construction, the PIR sensors
are segmented, which means in one component, two or more indi-
vidual elements are in interconnected form, so that the self tempera-
ture of sensor gets itself compensated. Only the change in PIR signal
is processed by the subsequent evaluation circuit.
In devices for wall mounting, normally double element sensors are
used which have a horizontal preferred direction. The mounting
direction of such sensors is described accordingly and this should be
adhered to. For ceiling mounting, four element sensors are more suit-
able with which hemispherical characteristics can be achieved.
Lens:
An alteration of output voltage is achieved only because the part
segments of the sensor are acted upon differently with the infrared
radiation. In addition, an optical system or a special Fresnel lens is
required, which subdivides the area in front of the sensor element into
segments and correspondingly reproduces it on the part segments
of the sensor. If one looks at the overall system considering optics,
sensor and evaluation circuit, it can be appreciated that the lens has
main inuence on the performance of the system.
Further information about our extensive delivery program for lens and
mirror-optics can be obtained on request.
RESET - Function:
After connecting to supply voltage, the sensor requires about 40
seconds time to become ready for operation. During this time span, the
relay is switched on.
During the rst 10 seconds after switching on, the device can be
changed to TEST operating mode by pressing the button twice, other-
wise the sensor is in light and motion controlled automatic operation.
40 seconds after RESET or powering up the system, one can switch to
continuous ON operation by pressing the button twice.
If the button is operated for more than 3 seconds, the circuit executes
a renewed Reset and behaves exactly as though the operating voltage
has been switched on again.
Testmode:
The PIR module is provided with a test mode, in which the relay triggers
for approx. 2 seconds with each recognised movement. With this, for
example, it is possible to adjust the sensitivity as per the local condi-
tions during setting up.
In order to arrive to the test mode, the button must be operated within
rst 10 seconds after switching on or by consecutively pressing twice
after RESET. For quitting, the relay shortly closes three times (2 Hz).
The test mode is left automatically, if no more movement is recognized
for a time gap of more than 30 seconds. On leaving the test mode, the
relay also shortly closes 3 times (at 2 Hz) to signal the changeover.
Automatic Operation/Continuous Function:
One can switchover to continuous light mode, by pressing the button
twice consecutively, 40 seconds after switching on. The relay closes
consecutively for three long times (at 1 Hz) as a conrmation.
The continuous function will again automatically discontinue after 8
hours of switching on. Alternatively, the continuous function can also be
discon-tinued by renewed, twice repeated pressing of the button. The
relay acknowledges this by three brief closures (2 Hz). The device is
again in light and motion controlled automatic operation.
Normal Operation (Automatic Mode):
In the automatic mode, the module is brightness and movement con-
trolled. In lighted environment (daylight), the relay is not triggered. The
light sensor has an additional time related branch, so that short-term
events under 5 seconds are not registered, for example, short time
illumination of light sensor through a car driving past at night doesn’t
disturb the function.
In dark environment (night), the module triggers the relay for an adjust-
able time, after a movement is recognized. A renewed, recognized
movement sets back the delay timer, which means the delay timer
starts again.
Evaluation Filter:
The ASIC evaluates the recognized movement events as per time and
frequency to ensure a reliable recognition.
• Either three very short trigger impulses within 2 seconds or
• Two trigger events, where one impulse must be longer than 0.34
seconds.
• A trigger impulse of more than 0.34 seconds duration.
Settings:
The sensitivity of the module for movement events can be adjusted
over a potentiometer “SENSITIVITY“.
The time period, for which the relay is to be triggered, can be adjusted
over the potentiometer “TIMER”.
The adjustment of light sensor at the desired brightness switching point
is done over the potentiometer “LIGHT”.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
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