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Handling Instructions
For SHTxx Humidity and Temperature Sensors
Sensirion's relative humidity and temperature sensors SHTxx (where xx serves as placeholder) offer best in class
performance in a broad range of applications. However, to make the most of their excellent performance, it is
important to take some precautions during storage, assembly, and packaging. We recommend to carefully
review these handling instructions, ideally during the design-in phase and before production release. Special
attention should be paid to avoiding exposure to volatile organic compounds in high concentrations and/or
for long periods of time, particularly during manufacturing and storage. Therefore, proper handling to mitigate
any risks and correct material selection is crucial to ensure highest performance. Application of SHTxx in the
field in ambient environment is not critical.
Key Instructions
Protection against ESD is mandatory.
•
Do not use polyethylene antistatic bags.
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Do not apply board wash.
•
Do not apply spray to unprotected sensor.
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This document is applicable to all Sensirion SHTxx humidity and temperature sensors.
Contents
1
General .................................................................................................................................................................................................... 2
1.1 ESD ................................................................................................................................................................................................. 2
1.2 Storage ......................................................................................................................................................................................... 2
1.3 Exposure to chemicals ............................................................................................................................................................ 4
2
Assembly ................................................................................................................................................................................................ 4
3
Operation in the Field ....................................................................................................................................................................... 9
4
Extreme Conditions and Reconditioning .................................................................................................................................. 9
5
Removable Protective Cover ........................................................................................................................................................ 10
6
Bibliography ........................................................................................................................................................................................ 11
7
Disclaimer ............................................................................................................................................................................................ 11
8
Revision History ................................................................................................................................................................................. 11
www.sensirion.com / D1
Be careful exposing the sensor to VOC.
•
Prevent sensor from exposure to cleaning
•
agents.
Cover the sensing element during coating.
•
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Version 8.2 - October 2023
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Summary of Contents for SENSIRION SHT Series
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Page 1: Table Of Contents
For SHTxx Humidity and Temperature Sensors Sensirion’s relative humidity and temperature sensors SHTxx (where xx serves as placeholder) offer best in class performance in a broad range of applications. However, to make the most of their excellent performance, it is important to take some precautions during storage, assembly, and packaging. -
Page 2: General
By following these guidelines, you can ensure that the sensors are in the best possible condition for assembly and use. SHT41 – 2500pcs Inspected Instruction 2. Store sensors in original, unopened ESD bag. Place additional stickers only on the outside of the ESD bag. www.sensirion.com / D1 Version 8.2 – October 2023 2 / 13... - Page 3 Humidity Sensors” [1]. This guide will provide you with simple and straightforward instructions to help you This recommendation also applies to devices with assembled sensors. Especially for harsh shipping conditions. www.sensirion.com / D1 Version 8.2 – October 2023 3 / 13...
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Page 4: Exposure To Chemicals
Vapor phase soldering may not be recommended for the assembly of this specific product. If no alternative options are available, it is advised that the end-user or a qualified party conducts a compatibility qualification. Please note that the compositions of heat transfer liquids can vary among manufacturers, and therefore Sensirion cannot provide specific information regarding their use in vapor phase soldering. - Page 5 Alternatively use the Sensirion solution with protective cover. Additionally, the sensor opening should not be covered with any coating, so that the top surface of the sensor remains free.
- Page 6 Not compatible Dow Corning 1-2620 Compatible Humiseal 1R32A-2 Compatible Humiseal 1B51NSLU Compatible Humiseal 1B12LU Not Compatible Humiseal 1A27 Not Compatible Humiseal 1B73EPA Not Compatible Table 2. Conformal coating compatibility. www.sensirion.com / D1 Version 8.2 – October 2023 6 / 13...
- Page 7 Instruction 7. In conjunction with the sensor, use only recommended Kapton® tape Electrical Tape 92 by 3M™. Do not apply any other adhesive tapes such as Scotch Tape, Sello Tape, Tesa Film etc. www.sensirion.com / D1 Version 8.2 – October 2023...
- Page 8 During repair and rework of assemblies containing sensors, it is recommended to cover the sensor with Kapton tape, as per the specific recommendation in Table 3. Additionally, it is important to be cautious when using www.sensirion.com / D1 Version 8.2 – October 2023...
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Page 9: Operation In The Field
Such applications need to be tested and validated thoroughly. As described above, exposure to acids or bases may also be critical. For it to be critical, their concentration must www.sensirion.com / D1 Version 8.2 – October 2023... -
Page 10: Removable Protective Cover
Hence, the contacts must be well-protected (passivated) in potentially corrosive environments – see also Section 2. The application of Sensirion humidity and temperature sensors to severe conditions must be cautiously tested and validated. Sensirion qualifies its humidity and temperature sensors to function appropriately within ambient clean air –... -
Page 11: Bibliography
Bibliography Sensirion, "Sensors Specification Statement and Testing Guide," 19 April 2021. [Online]. Available: https://sensirion.com/products/downloads/. Sensirion, "SHTxx Design Guide," [Online]. Available: www.sensirion.com. Sensirion, "Creep Mitigation SHT4x," 04 2022. [Online]. Available: https://sensirion.com/media/documents/A88858C9/629626D4/Application_Note_Creep_Mitigation_SHT4 x.pdf. L. Greenspan, "Humidity Fixed Points of Binary Saturated Aqueous Solutions," J Res Natl Bur Stand A Phys Chem, vol. - Page 12 June 2023 Added Disclaimer for Vapor Phase Soldering in section 2 October 2023 Multiple Corrected typos Image format changed Changed “absorbs” to “desorbs” Added section about protective cover visual anomalies www.sensirion.com / D1 Version 8.2 – October 2023 12 / 13...
- Page 13 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 quality, material and workmanship defined in SENSIRION’s published specifications of the product.
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