Siemens AQR253/4... Flush Mount Sensor

•  Active flush-mounted room sensor comprising front module, base module and design frame accessory that can be ordered separately
• Operating voltage AC 24 V or DC 15-36 V
• Adjustable signal outputs: DC 0-10 V; DC 2-10 V; DC 0-5 V; DC 0-20 mA; DC 4-20 mA; DC 0-10 mA;
• Maintenance-free CO2 sensing element based on optical infrared absorption measurement (NDIR1))
• VOC2) sensing element based on a heated tin dioxide semi-conductor
• Determination of air quality (IAQ3)) by maximum selection from CO2 and VOC sensing signals
• CO2 value indicated by LED
• Field of use 0…+50 °C / 0…95 % r.h. (non-condensing) / 0…2000 ppm
• Active multi-sensor for CO2-temperature, CO2-humidity, and humiditytemperature
• Passive temperature sensor (LG-Ni1000 / NTC 10k)

1) NDIR = Non-dispersive infrared
2) VOC = Volatile organic compounds
3) IAQ = Indoor air quality

Use

In ventilation and air conditioning plants, to optimize comfort and energy consumption based on demand-controlled ventilation.

The room sensor records:
CO2 concentration to indicate presence in smoke-free rooms.
VOC concentration to indicate presence of odors in rooms, e.g. from tobacco smoke, body odor, material fumes.
Relative humidity in the room.
Temperature in the room.

Typical use:
Measure CO2 and VOC concentration: In party rooms, foyers, exposition and exhibition halls, canteens, shopping malls, sports facilities, sales rooms, meeting rooms, residential rooms.
Measure CO2 concentration: In rooms with varying occupancy with regard to time or number of persons, smoke-free rooms such as museums, theaters, movie theaters, lecture halls, offices, classrooms.

Devices for CO2 or VOC measurement are not suited for safety applications such as: Warning against presence of gas or smoke.

Model