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SEN6x – Mechanical Design and Assembly Guidelines
3
rd
Generation Environmental Sensor Node for Air Quality Applications
Preface
To ensure the best performance of the sensor in the end user device, it is important to consider a few
recommendations when designing a product using SEN6x. This application note will present the main design-
in and assembly guidelines for the best sensor performance.
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www.sensirion.com / D1
Version 0.91 – May 2025
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Summary of Contents for SENSIRION SEN6 Series
- Page 1 SEN6x. This application note will present the main design- in and assembly guidelines for the best sensor performance. Scan me to provide feedback www.sensirion.com / D1 Version 0.91 – May 2025 1 / 12...
- Page 2 (internal in the design), P as seen in Figure 3. Any restriction of the airflow through the Sensor module will proportionally affect the count rate of particulate matter and therefore the sensor readings. www.sensirion.com / D1 Version 0.91 – May 2025 2 / 12...
- Page 3 Input and output need to be well insulated from each other and from the rest of the device’s volume Figure 2. Insulation and air channel design of the device with SEN6x inside www.sensirion.com / D1 Version 0.91 – May 2025...
- Page 4 Placing the sensor with the inlets/outlet facing up/down can lead to internal dust accumulation and accelerated sensor aging. Large dust particles might fall into the sensor if the inlets/outlet is facing up. Figure 4. Vertical placement options of SEN6x www.sensirion.com / D1 Version 0.91 – May 2025 4 / 12...
- Page 5 Lateral placement Both orientations are ok Figure 5. Lateral placement options of SEN6x Horizontal placement Both orientations are ok Figure 6. Horizontal placement option of SEN6x www.sensirion.com / D1 Version 0.91 – May 2025 5 / 12...
- Page 6 1 m/s. For a design-in where the external flow velocity is greater than 1 m/s, consider a duct air mount (reducing the turbulences on the sensor openings). Isolate the sensor from external airflows if the flow velocity is greater than 1 m/s. Figure 7. Isolation of external airflows www.sensirion.com / D1 Version 0.91 – May 2025 6 / 12...
- Page 7 2.4 Decoupling from External Heat Sources The Sensirion SEN6x sensor output is compensated for self-heating of the module itself. If the sensor is built into a system, other heat sources such as microcontrollers, battery, Wi-Fi module, display, etc. add an additional temperature offset.
- Page 8 Thus, it is recommended to protect the sensor from direct sunlight. This can be achieved by a suitable design-in or by using a light shade. Avoid exposure of the sensor to direct sunlight. Figure 9. Design consideration for sunlight www.sensirion.com / D1 Version 0.91 – May 2025 8 / 12...
- Page 9 Note that sensor acoustic emission level is always according to datasheet specifications. Acoustic foam helps to reduce unwanted noise generated by the mechanical coupling between the sensor and the housing. www.sensirion.com / D1 Version 0.91 – May 2025 9 / 12...
- Page 10 Figure 11. Snap fixture for SEN6x www.sensirion.com / D1 Version 0.91 – May 2025 10 / 12...
- Page 11 Bibliography [1] Sensirion, "SEN6x - Temperature Acceleration and Compensation Instructions," April 2025. [Online]. Available: www.sensirion.com. Revision History Date Version Page(s) Changes December 2024 Initial public release Add required area in Coupling to Ambient, Improve description in May 2025 0.91 Decoupling from External Heat Sources, Add reference in Mechanical Assembly Guidelines to STEP file of example retainer www.sensirion.com / D1...
- Page 12 Warranty SENSIRION warrants solely to the original purchaser of this product for a period of 12 months (one year) from the date of delivery that this product shall be of the qualit , material and workmanship defined in SENSIRI N’s published specifications of the product.
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