General Description
The RE 200B is a passive infrared sensor designed to pick up heat radiation of wave lengths
in a band around 10 microns. It contains two active elements configured as balanced diffe-rential series opposed type. This results in good compensation of environmental temperature
and excellent sensitivity for small changes of a spatial temperature pattern. Thermal signals
far below one microwatt are sufficient to trigger a sufficient output voltage change
Functional Description
If the active elements of the PIR sensor are exposed to a change in the surrounding
temperature field, electrical charges are separated within the sensor elements. The voltage
across the sensors controls a J-FET source follower impedance converter and thus
modulates the output current of the PIR detector
The spectral sensitivity of the sensor is controlled by the optical transfer characteristics of
the window in the case and has been optimized to pick up radiation of the human body
Operating Conditions
Operating Temperature -20 ˚C to +70˚C
Storage Temperature -30˚C to +80˚C
Operating Voltage 3 to 10 V at Rs = 47 kΩ