Symaro™ Room air quality sensor Modbus RTU QPA2052/MO Room air quality sensor with Modbus communication ● ● ● ● A6V12046144_en--_a 2020-07-23 Modbus RTU (RS-485) Maintenance-free CO2 sensing element No recalibration required DIP switches set together with other controllers Smart Infrastructure
Use QPA2052/MO is used in ventilation and air conditioning plants to acquire room ● CO2 concentration ● temperature ● relative humidity The sensor is used as a measuring sensor for building automation and control systems or display units. Technical design The units are designed for wall mounting and can be deployed with most types of commercially available recessed conduit boxes.
Mounting Location Inner wall (not exterior!) in the room to be air conditioned; not in niches, not behind curtains, not above or close to heat sources or shelves nor on walls with a chimney. Do not expose to direct light from spot lights or direct solar radiation. Install the sensor in the occupied space about 1.5 m above the floor and at least 50 cm from the next wall. Seal the end of the conduit at the sensor to prevent false measurements due to drafts through the conduit.
Technical data Function Communication Modbus RTU (RS-485) Supported baud rate 9600; 19200; 38400; 57600; 76800; 115200 Transmission format 1-8-E-1; 1-8-O-1; 1-8-N-1; 1-8-N-2 Bus termination 120 ohm, jumper selection For detailed information on specific functions, see Basic documentation (A6V12045847 *). Power supply Operating voltage AC 24 V ±20 % or DC 13.5…35 V (SELV) or AC/DC 24 V class 2 (US) Frequency 48...63 Hz at AC 24 V External supply line protection Fuse slow max.
Ambient conditions and protection classification Protection degree of housing IP30 according to EN 60529 in built-in state Protection class III according to EN 60730-1 Environmental conditions Storage IEC 60721-3-1 ● ● Climatic conditions – Temperature – Humidity Class 1K3 -15...50 °C < 95 % r.h. Climatic conditions Class 1M2 IEC 60721-3-2 Class 2K3 – Temperature -25...70 °C – Humidity 0...95 % r.h.
Diagrams Connection terminals 6 Siemens Smart Infrastructure G Operating voltage AC 24 V ±20 % or DC 13.5...
Dimensions Dimensions in mm Siemens Smart Infrastructure Datasheet 7 A6V12046144_en--_a 2020-07-23
Issued by Siemens Switzerland Ltd Smart Infrastructure Global Headquarters Theilerstrasse 1a CH-6300 Zug Tel. +41 58 724 2424 www.siemens.com/buildingtechnologies 8 Siemens Smart Infrastructure Document ID A6V12046144_en--_a Edition 2020-07-23 © Siemens Switzerland Ltd, 2020 Technical specifications and availability subject to change without notice.
