User Manual

Siemens Building Technologies CM1N5485E / 10.1998
Landis & Staefa Division 1/6
5
485
Presence Detector QPA83.2
with one control,
360° surveillance, for ceiling mounting
Microprocessor-based passive infrared presence detector for demand-dependent
control of HVAC equipment.
The detector operates on AC 230 V and has a potential-free HVAC control output.
The QPA83.2 presence detector is a self-contained unit designed for the control of
HVAC equipment.
It is used especially in spaces that are occupied on a temporary basis, where the
presence of a moving infrared source (persons) shall be detected.
The presence detector can be used in all kinds of spaces where, for maximum energy
savings, demand-dependent control is given preference over fixed time scheduling.
• Hospital rooms, hotel rooms, single or open plan offices, conference rooms.
• Primarily in rooms where few physical movements occur; confined quadrate detection
zone.
• Control of fans
• Switching of temperature setpoints
• Activation of room air conditioners
•
Control of circulating pumps
The QPA83.2 presence detector has an infrared sensor which detects changes in
passive infrared radiation in the space, which are then converted into electric control
pulses.
It captures changes in the thermal pattern caused by physical movements. This is
achieved by making a comparison of the thermal radiation of people and the constant
thermal radiation of the environment.
The detection zone is determined by the detector's height above the floor (refer to
illustration under «Engineering notes»). Up to a height of 5 m, the unit's sensitivity is
sufficient to detect specific physical movements of people (typically 50 cm).
Use
Typical use (HVAC only)
Criteria for use
Tasks that can be
performed
Functions