Multifunctional on-wall sensors and measuring transducers, for humidity, temperature, CO2 content and air quality (VOC), calibratable, with active ⁄ switching output Maintenance-free on-wall sensor AERASGARD ® ATM - CO2 - SD with active output, automatic calibration, in an impactresistant plastic housing with quick-locking screws, for determining the CO2 content of the air (0...2000 ppm/0...5000 ppm) and the temperature (–35...+80 °C). The measuring transducer converts the measured values into a standard signal of 0 -10 V. Maintenance-free on-wall sensor AERASGARD ® AFTM - LQ - CO2 - W with active/switching output, automatic calibration, in an impact-resistant plastic housing with quick-locking screws, optionally with/without Display, for determining the CO2 content of the air (0...2000 ppm/0...5000 ppm), the quality (0…100 %  V OC), the temperature (–35...+80 °C) as well as the relative air humidity (0…100 %  R H). The measuring transducer converts the measured values into a standard signal of 0 -10 V or 4...20 mA (switchable). The sensor is used in offices, hotels, convention centres, apartments, shops, etc. for the purpose of evaluating the indoor climate. This enables energy-saving room ventilation on an as-needed basis, thereby reducing operating costs and improving well-being. One sensor for every 30 m² of room area is recommended. A long-term stable, digital humidity and temperature sensor guarantees exact measurement results. The CO2 measurement is performed using an optical NDIR sensor (non-dispersive infra-red technology). The detection range is calibrated for standard applications such as monitoring residential rooms and conference rooms. The air quality is detected by a VOC sensor (mixed gas sensor for volatile organic substances). This sensor determines the loading of the room air due to contaminated gases such as cigarette smoke, body perspiration, exhaled breathing air, solvent vapours, emissions, etc. With regard to the expected air contamination, low, medium or high VOC sensitivity can be selected. As an alternative, use IAQ categories (from excellent to unhealthy) following the guidelines of the German Federal Environmental Agency to assess the room air. For more information, see the start of the chapter. TECHNICAL DATA Voltage supply:  Power consumption:  Outputs: Relay output:  24 V AC ⁄ DC (± 10 %) <  4.8  W ⁄ 24 V DC typical; <  6.8 VA ⁄ 24 V AC typical; peak current 200  m A Axx - SD 0 -10 V (fixed) Axx - W 0 -10 V or 4...20 mA, working resistance  < 800  Ω (selectable via DIP switches, selected variant applies for all outputs), with offset potentiometer (± 10 % of the measuring range) Axx - SD without changeover contact Axx - W  with potential-free changeover contact (24 V / 1 A) digital humidity sensor with integrated temperature sensor, low hysteresis, high long-term stability Sensor protection:  plastic sinter filter, Ø 16 mm, L = 35 mm, exchangeable (optional metal sinter filter, Ø 16 mm, L = 32 mm) Measuring range, humidity:  0...100 % RH Operating range, humidity:  0...95 % RH (without dew formation) Deviation of humidity:  typically ± 2.0 % (20...80 % RH) at +25 °C, otherwise ± 3.0 % Output, humidity:  0 -10 V or 4...20 mA (selectable via DIP switches) TEMPERATURE Measuring range, temperature:  –35...+80 °C Operating range, temperature:  –10...+60 °C Temperature deviation:  typically ± 0.4 K at 25 °C Output, temperature:  Axx - SD 0 -10 V (fixed) Axx - W 0 -10 V or 4...20 mA (selectable via DIP switches) AIR QUALIT Y (VOC) Sensor, VOC: VOC sensor (metal oxide) (VOC = volatile organic compounds), with manual calibration (using zero button) and automatic calibration (permanently active) Measuring range, VOC: 0...100 % air quality; referred to calibrating gas; multi-range switching (selectable via DIP switches) VOC sensitivities (low/medium/high) or IAQ category (Indoor Air Quality) Output, VOC:  0 -10 V (0 V  =  clean air, 10 V  =  polluted air) or 4...20 mA (selectable via DIP switches, switchpoint can be adjusted from 0...100 % of the output signal) Measuring accuracy, VOC: typically ± 20 % of final value (referred to calibrating gas) Service life: > 60 months (under normal load conditions) depending on the type of loading and gas concentration CARBON DIOXIDE (CO2) Sensor, CO2:   optical NDIR sensor (non-dispersive infra-red technology), with manual calibration (via zero button), Axx - SD with automatic calibration (fixed) Axx - W   with automatic calibration (can be deactivated via DIP switches) Measuring range, CO2:  0...2000  ppm or 0...5000  p pm (selectable via DIP switches) Output, CO2:  Axx - SD 0 -10 V (fixed) Axx - W 0 -10 V or 4...20 mA (selectable via DIP switches) Measuring accuracy, CO2:  typically ± 30 ppm ± 3 % of measured value Temperature ± 5 ppm   ⁄  °C or ± 0.5 % of measured va

Multifunctional on-wall sensors and measuring transducers, for humidity, temperature, CO2 content and air quality (VOC), calibratable, with active ⁄ switching output AFTM - LQ -CO2 -W with plastic sinter filter (standard) M12 connector (optional on request) SF -K plastic sinter filter (standard) AFTM - LQ -CO2 -W with display and plastic sinter filter (standard) SF -M metal sinter filter (optional) TECHNICAL DATA Pressure dependence:  Long-term stability:  Gas exchange:  Ambient temperature: Response time: Electrical connection: Housing: Housing dimensions: Cable connection: Protective tube:...