Document number BST-BME280-HS006-00 | May 2018 Bosch Sensortec
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parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Figure 6: Do not apply spray to the BME without port protection
It is recommended to cover the hole of the device with a protective cover during processing to
avoid contamination of the MEMS sensors with all kind of liquids, dust, e.g. kapton tape during
assembly, e.g. cleaning, soldering. No board wash is applied once the sensor is assembled to the
PCB w/o protection of the sensor hole
Figure 7: Do not apply liquids to the BME without port protection
Forbidden is the exposure to chemicals. It shall be avoided that the sensor gets in close contact
with volatile chemicals such as solvents or other organic compounds in high concentration and
long exposure. Toluene, Acetone, Ethanol, Ketenes Isopropyl Alcohol, etc. are identified to effect
drift of the humidity reading – permanent damage of the sensor readings is very likely in most of
these cases. It is important to know that the referred materials to are ingredients for adhesives,
epoxies, glues, etc. and outgassing during re-conditioning baking and curing. These chemicals
are also added as plasticizers into plastics, used for packaging materials, and outgassing for a
limited time. Bases and acids can damage the sensor permanently and shall be kept away from
the sensor. Examples for such chemicals are NH
3
, NaOH, HCl, H
2
SO
4
, HF, HNO
3
, H
2
S
2
O
7
etc.
Additionally O
3
in high concentration or H
2
O
2
have the same effect and is not recommended.
The reason to protect against exposure of the sensor to chemicals leads to the recommendation
to store the sensors in original packing including the sealed ESD bag at following conditions :
Temperature shall be in the range of 10~50 °C and humidity at 20%~60 %rH
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