SEK-SEN5X

Datasheet SEN5x Environmental Sensor Node for HVAC and Air Quality Applications ▪ ▪ ▪ ▪ ▪ PM, NOx, VOC, RH & T sensor platform Fast & easy integration One driver for up to 8 data signals Superior sensing accuracy and lifetime Fully calibrated digital output Overview The SEN5x is a unique sensor module family combining the measurement of critical air quality parameters – particulate matter, VOC, NOx, humidity, and temperature – in a single package. The modules are a result of Sensirion’s extensive experience in environmental sensing and offers best possible performance of each sensing parameter, a superior lifetime, as well as a compact form factor. The SEN5x sensors provide fully calibrated outputs with a digital interface. The combination of all measurement parameters in a single device allows manufacturers of air quality devices to reduce design and integration efforts, shorten development times and simplify their supply chain. Proprietary algorithms enable straightforward integration into HVAC and air quality applications allowing resource/time savings and focus on core competencies. The implemented Sensirion Temperature Acceleration Routine (STAR) engine accelerates the device’s response to ambient temperature change by a factor of 2-3 to provide better UX and more accurate measurements to end users. www.sensirion.com Version 2 – D1 – March 2022 1/30 Air Flow RH & T I2C VOC & NOx 3V3 Laser Power Supply 5V VDD Laser Controller SDA MCU SCL Amplifier & Filter Photodiode Fan ESD Protection GND Fan Controller Figure 1 Functional block diagram of the SEN5X. The RH & T and VOC sensors are only contained in the SEN54 and SEN55, the NOx signal is only contained in the SEN55. www.sensirion.com Version 2 – D1 – March 2022 2/30 Content 1 Product Family Overview and Ordering Information 4 2 Environmental Sensor Node Specifications 5 3 Electrical Specifications 11 4 Hardware Interface Specifications 13 5 Functional Overview 6 Operation and Communication through the 14 I2C Interface 17 7 Technical Drawings 26 8 Revision History 28 9 Important Notices 29 www.sensirion.com Version 2 – D1 – March 2022 3/30 1 Product Family Overview and Ordering Information The SEN5x product family consists of a lineup of sensors with identical dimensions, identical hardware & firmware interface, and varying number of sensor outputs. Table 1 gives an overview of all available product variants with their respective sensor outputs. Specifications and commands for sensor inputs/outputs only apply for the given product if the sensor output is part of this product. Products SEN50-SDN-T Sensor outputs Particulate Matter Description Article Number 3.000.667 Particulate matter sensor, tray packaging, 45 pcs. per tray SEN54-SDN-T Particulate Matter Relative Humidity Temperature VOC Index Environmental sensor node, tray packaging, 45 pcs. per tray 3.000.535 SEN55-SDN-T Particulate Matter Relative Humidity Temperature VOC Index NOx Index Environmental sensor node, tray packaging, 45 pcs. per tray 3.000.593 Table 1: Sensor module specifications. www.sensirion.com Version 2 – D1 – March 2022 4/30 2 Environmental Sensor Node Specifications Default conditions of standard Measurement-Mode (6.1.1), 25 °C and 5 V supply voltage apply to values in the table below, unless otherwise stated. 2.1 Sensor Module Specifications Parameter Sampling interval Conditions - Lifetime1 Acoustic emission level Long term acoustic emission level drift Weight 24 h/day operation 0.2 m 0.2 m - Value 1  0.03 > 10 24 +0.5 36.4  10% Units s years dB(A) dB(A) / year g Table 2: Sensor module specifications. 1 Lifetime is based on mean-time-to-failure (MTTF) calculation. Lifetime might vary depending on different operating conditions. www.sensirion.com Version 2 – D1 – March 2022 5/30 2.2 Particulate Matter Specifications Parameter Mass concentration specified range Mass concentration size range Conditions PM1.0 PM2.5 PM4 PM10 0 to 100 μg/m3 Value 0 to 1’000 0.3 to 1.0 0.3 to 2.5 0.3 to 4.0 0.3 to 10.0 Units μg/m3 μm μm μm μm 100 to 1000 μg/m3 5 μg/m3 AND 5 % m.v. % m.v. 10 0 to 100 μg/m3 25 μg/m3 100 to 1000 μg/m3 25 % m.v. Maximum long-term mass concentration precision limit drift 0 to 100 μg/m3 1.25 μg/m3 / year Typical start-up time6 number concentration Mass concentration precision2,3 for PM1 and PM2.54 Mass concentration precision2,3 for PM4, PM105 Sensor output characteristics Additional T-dependent mass precision limit drift3 Laser wavelength (DIN EN 60825-1 Class 1) 100 to 1000 μg/m3 200 – 3000 #/cm3 100 – 200 #/cm3 50 – 100 #/cm3 PM2.5 mass concentration temperature difference to 25°C typ. typ. % m.v. / year 1.25 8 s 16 s 30 s Calibrated to TSI DustTrak™ DRX 8533 Ambient Mode % m.v. / °C 0.5 660 nm Table 3: Particulate matter sensor specifications. Default conditions of 252 °C, 5010% relative humidity and 5 V supply voltage apply unless otherwise stated. ‘max.’ means ‘maximum’, ‘typ.’ means ‘typical’, ‘% m.v.’ means ‘% of measured value’. 2 Also referred to as “between-parts variation” or “device-to-device variation”. For further details, please refer to the document “Sensirion Particulate Matter Sensor Specification Statement”. 4 Verification Aerosol for PM2.5 is a 3% atomized KCl solution. Deviation to reference instrument is verified in end-tests for every sensor after calibration. 5 PM4 and PM10 output values are calculated based on distribution profile of all measured particles. 6 Time after starting Measurement-Mode, until a stable measurement is obtained. 3 www.sensirion.com Version 2 – D1 – March 2022 6/30 2.1 Temperature and Humidity Specifications Parameter Compensated outputs8 Conditions - Value 7 Temperature and Relative Humidity Typical accuracy temperature @ 15-30 °C, 50 %RH Max. accuracy temperature Repeatability temperature Response time temperature9 @ 15-30 °C, 50 %RH @ 25 °C, 50 %RH 0.45 ±0.7 0.1 < 60 Typical accuracy relative humidity @ 25 °C, 30-70 %RH Max. accuracy relative humidity Repeatability relative humidity @ 25 °C, 30-70 %RH @ 25 °C, 50 %RH Response time relative humidity 10 @ 25 °C, 50 %RH,  63% @ 25 °C, 50 %RH,  63% 4.5 ±6 1 < 20 Units °C %RH °C °C °C s %RH %RH %RH s Table 4: Temperature and humidity specifications. 7 For the definition of the typical and max. accuracy tolerance, please refer to the document “Sensirion Humidity Sensor Specification Statement”. Self-heating of the module is compensated according to the application note “Temperature Acceleration and Compensation Instructions for SEN5x”. 9 For a step from 15°C to 25°C 10 For a step from 75%RH to 25%RH 8 www.sensirion.com Version 2 – D1 – March 2022 7/30 2.2 Gas Specifications Parameter Output signals Device-to-device variation Values Min. 1 1 – Comments VOC Index NOx Index VOC Index12 Typ.11 – –