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SymaroTM Room sensors for relative humidity and temperature Modbus RTU QFA2050/MO, QFA2050D/MO Room relative humidity and temperature sensors with Modbus communication Modbus RTU (RS-485) Relative humidity measuring accuracy of 3 % within the comfort range DIP switches set together with other controllers A6V12046135_en--_a 2020-07-23 Smart Infrastructure Use QFA2050/MO and QFA2050D/MO are used in ventilation and air conditioning plants to acquire room relative humidity temperature 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. The cables can be introduced from the rear (concealed wiring), from below or above (surface-run wires) through knock-out openings. Measured value display QFA2050D provides the measured values on its LCD display. The following measured values are displayed, alternating at intervals of 5 s: Temperature: in °C or °F Humidity: in % r.h. Type summary Product number QFA2050/MO QFA2050D/MO SSN No. Temperature measuring range S55720-S508 -40...70 S55720-S509 -40...70 Humidity measuring range 0...100 % 0...100 % Operating voltage Output signal AC 24 V ±20 %/ DC 13.5...35 V AC 24 V ±20 %/ DC 13.5...35 V Modbus RTU Modbus RTU Ordering and delivery When ordering, specify name and product number, for example: Room sensor QFA2050/MO. Notes Engineering The following impacts the accuracy of measurement: Prevailing air flow Wall surface (rough, smooth) Wall texture (wood, plaster, concrete, brick) Wall type (interior, exterior). This application-specific measuring inaccuracy is constant for an installed sensor after approx. 1 hour of operation and can be adjusted as needed in a higher system (e.g. controller). No correction on the local LCD. Powering the sensor requires a transformer for safety extra low-voltage (SELV) with separate windings for 100 % duty. When sizing and protecting the transformer, comply with all local safety regulations. When sizing the transformer, consider the sensor's power consumption. For correct wiring, see the related device data sheets. Observe all permissible line lengths. 2 Siemens Smart Infrastructure Datasheet A6V12046135_en--_a 2020-07-23 Mounting Cable routing and cable selection Note that when routing cables, the longer the cable runs and the closer the cables, the greater the electrical interference. Use shielded cables in EMC-prone environments. Twisted pair cables are required for both secondary supply lines and signal lines. 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. Mounting instructions Mounting instructions are enclosed in the package. Chemical vapors The sensor is a highly sensitive measuring device and must be handled with care. Exposure to high concentrations of chemical vapors for longer periods may distort sensor readings. NOTICE Avoid direct contact with chemicals in any form. Do not touch sensitive components with bare hands or tools as this will negatively impact measuring accuracy. CAUTION! Do not to apply voltmeters or ohmmeters directly to the sensing element. Commissioning Sensor functions can be checked 30 minutes after applying power. Disposal The device is considered an electronic device for disposal in accordance with the European Guidelines and may not be disposed of as domestic garbage. Dispose of the device through channels provided for this purpose. Comply with all local and currently applicable laws and regulations. Siemens Smart Infrastructure Datasheet 3 A6V12046135_en--_a 2020-07-23 Technical data Function Communication Supported baud rate Transmission format Bus termination Modbus RTU (RS-485) 9600; 19200; 38400; 57600; 76800; 115200 1-8-E-1; 1-8-O-1; 1-8-N-1; 1-8-N-2 120 ohm, jumper selection For detailed information on specific functions, see Basic documentation (A6V12045847 *). Power supply Operating voltage Frequency External supply line protection Power consumption AC 24 V ±20 % or DC 13.5...35 V (SELV) or AC/DC 24 V class 2 (US) 48...63 Hz at AC 24 V Fuse slow max. 10 A or Circuit breaker max. 13 A Characteristic B, C, D according to EN 60898 or Power source with current limitation of max. 10 A 1.5 VA Functional data Humidity sensor Measuring range Range of use Measuring accuracy at 23 °C and AC/DC 24 V in 0...95 % r.h. 30...70 % r.h. Temperature dependency Time constant Temperature sensor Measuring range Range of use Measuring accuracy at AC/DC 24 V in 23 °C 15...35 °C -35...50 °C Time constant t63 0...100 % r.h. 0...95 % r.h. (non-condensing) ±5 % r.h. ±3 % r.h. 0.05 % r.h./°C Approx. 20 s -40...70 °C -15...50 °C ±0.3 K (typical) ±0.7 K ±1 K 8.5 min Ambient conditions and protection classification Protection degree of housing Protection class Environmental conditions Storage Climatic conditions Temperature Humidity Mechanical conditions Transport Climatic conditions Temperature Humidity IP30 according to EN 60529 in built-in state III according to EN 60730-1 IEC 60721-3-1 Class 1K3 -15...50 °C < 95 % r.h. Class 1M2 IEC 60721-3-2 Class 2K3 -25...70 °C 0...95 % r.h. 4 Siemens Smart Infrastructure Datasheet A6V12046135_en--_a 2020-07-23 Ambient conditions and protection classification Mechanical conditions Operation Climatic conditions Temperature (housing with electronics) Humidity Mechanical conditions Class 2M2 IEC 60721-3-3 Class 3K5 -15...50 °C < 95 % r.h. Class 3M2 Standards, directives and approvals Product standard Electromagnetic compatibility (Applications) EU conformity (CE) RCM conformity UL Environmental compatibility EN 60730-1, EN 60730-2-9, EN 61000-6-2, EN 61000-6-3 Automatic electrical controls for household and similar use For use in residential, commercial, light-industrial and industrial environments A5W00138204A *) A5W00138207A *) UL 873, http://ul.com/database The product environmental declaration (A5W00128109A *) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal). General Cable lengths for measuring signals Perm. cable lengths Electrical connections screw terminals Product life time Materials and colors Housing front Bottom section of housing Base Sensor (complete assembly) Packaging Weight including package QFA2050/MO QFA2050D/MO See data sheet for the device handling the signal 1 × 2.5 mm2 or 2 × 1.5 mm2 > 10 years ASA + PC, NCS S 0502-G (white) equates to RAL9010 ASA + PC, NCS 2801-Y43R (grey) equates to RAL7035 PC, NCS 2801-Y43R (grey) equates to RAL7035 Silicone-free Corrugated cardboard Approx. 141 g Approx. 155 g *) The documents can be downloaded from http://siemens.com/bt/download. Siemens Smart Infrastructure Datasheet 5 A6V12046135_en--_a 2020-07-23 Diagrams Connection terminals G Operating voltage AC 24 V ±20 % or DC 13.5...35 V G0 GND + RS485 Modbus A - RS485 Modbus B Ref GND_ISO 6 Siemens Smart Infrastructure Datasheet A6V12046135_en--_a 2020-07-23 Dimensions Dimensions in mm Siemens Smart Infrastructure Datasheet 7 A6V12046135_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 A6V12046135_en--_a Edition 2020-07-23 © Siemens Switzerland Ltd, 2020 Technical specifications and availability subject to change without notice. Datasheet A6V12046135_en--_a 2020-07-23Microsoft Word 2016 Microsoft Word 2016