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Sida 1/6
www.sensirion.com Rev. 4 May 4 1/6 –201
Handling Instructions
For SHTxx Humidity and Temperature Sensors
Applicability
This document is applicable to all Sensirion SHTxx
humidity and temperature sensors.
ESD protection
The sensor shall be protected from ESD (Electrostatic
Discharge) only be handled in ESD protected areas and
(EPA) under protected and controlled conditions
(ground all personnel with wrist-straps, ground all non-
insulating and conductive objects, exclude insulating
materials from the EPA, operate only in grounded
conductive floor, etc.). Protect sensor outside the EPA
using ESD protective packaging.
Protection against ESD is mandatory.
Exposure to Chemicals
Humidity and Temperature sensors are highly accurate
environmental sensors and as such they are not
ordinary electronic components. The opening in the
package exposes the sensor to the environment and
makes it susceptible to pollutants. While applying
sensors in the field in ambient environment is not
critical, pollutants are known to occur in manufacturing
environments and during storage. Please carefully
follow the guidelines in this application note to ensure
that you can benefit of the sensor’s outstanding
performance.
The sensor shall not get in close contact with volatile
chemicals such as solvents or other organic
compounds. Especially high concentration and long
exposure must be avoided. Ketenes, Acetone, Ethanol,
Isopropyl Alcohol, Toluene, etc. are known cause to
drift of the humidity reading irreversibly in most of the –
cases. Please note that such chemicals are integral
part of epoxies, glues, adhesives, etc. and outgas
during baking and curing. These chemicals are also
added as plasticisers into plastics, used for packaging
materials, and do out-gas for some period.
Acids and bases may affect the sensor irreversibly and
shall be avoided: HCl, H
2
SO
4
, HNO
3
, NH
3
etc. Also
Ozone in high concentration or H
2
O
2
have the same
effect and therefore shall be avoided. Please note, that
above examples represent no complete list of harmful
substances.
The sensor shall not get in contact with cleaning agents
(e.g. PCB board wash after soldering) or strong air
blasts from an air-pistol (not oil-free air). Applying
cleaning agents to the sensor may lead to drift of the
reading or complete breakdown of the sensor.
Ensure good ventilation (fresh air supply) to avoid high
concentrations of volatile chemicals (solvents, e.g.
ethanol, isopropanol, methanol, acetone, cleaning
solutions, detergents…).
Packing and Storage
Prior to assembly or use of the sensors it is strongly
recommended to store the sensors in original the
sealed ESD bag at following conditions: Temperature
shall be in the range of 10°C 50°C (0 5°C for – – 12
Preface
Sensirion SHTxx are relative humidity and temperature
sensors of high quality. For taking advantage of their
outstanding performance some precautions must be
taken during storage, assembly and packaging.
Therefore, please read the following instructions
carefully - preferably during design-in phase and before
production release of the respective device. Special
attention is required regarding the exposure to volatile
organic compounds, i.e. high concentration and long
exposure time to respective gases shall be avoided.
Such conditions are known to occur in manufacturing
environment and/or during storage. Therefore proper
handling and choice of materials are crucial. Applying
sensors in the field in ambient environment is not
critical.
Produktspecifikationer
| Varumärke: | Sensirion |
| Kategori: | sensor |
| Modell: | SHT21 |
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