Sensirion SHT21 Manual

Sensirion sensor SHT21

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Side 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, H2SO4, HNO3, NH3 etc. Also

Ozone in high concentration or H2O2 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.

SHTxx Handling Instructions

www.sensirion.com Rev. 4 May 4 2/6 –201

limited time) and humidity at 20 60%RH (sensors that –

are not stored in ESD bags).

Store sensors in original, unopened ESD bag. Place

additional stickers only on the outside of the ESD

bag.

Once sensors have been removed from the original

ESD we recommend to store the individual sensors bag

as well as devices with assembled sensors in metal-in

antistatic shielded ESD bags In particular, it is .

recommended not to use any adhesive or adhesive

tapes to reseal the sensor bag after opening. Therefore

reclosable bags with zipper are preferred.

For a recommendation on specific ESD bags please

contact Sensirion.

Sensors as a component or mounted into the final

product shall not be packaged in outgassing plastic

materials which could cause sensor pollution. Besides

m -In antistatic shielded ESD , paper or etal bags

cardboards based packaging, deep drawn plastic trays

(PE, PET, PP) may be considered. Do not use antistatic

polyethylene bags (light blue, pink or rose color); be

very careful with bubble foils and foams.

Be careful about stickers present inside the packing

(e.g. on the housing of the device). Sticker size should

be kept to a minimum, and the sticky side shall fully

adhere onto a surface.

Please note that many packaging materials may be

provided with additives (plasticizers) which may have a

polluting effect on the sensor. Generally speaking, if a

material emits a strong odor you should not use it.

Additives may also be added to materials which are

listed for recommended use. For high safety, device

housing and shipment packaging must be qualified.

Such a qualification test may contain exposure of the

final device with sensor in its shipment packaging to

temperature ≥65°C for at least 168 hours. (If shipping

or storage conditions are expected to be harsh, the

qualification test conditions for the packing material

have to be customized.) The sensor reading then shall

show no changed deviation against a reference

compared to same measurements before the exposure.

Do not use polyethylene antistatic bags (light blue,

pink or rose color). Do not use adhesive tapes

inside packaging.

For guidance on simple and straight-forward testing of

humidity sensors please consult the Testing Guide for

humidity sensors.

Assembly

Sensors in SMT packages are classified as Moisture

Sensitivity Level 1 (IPC/JEDEC J-STD- ). It is 020

recommended to process the sensors within 1 year

after date of delivery.

Before developing the assembly process please read

the User s Guide of the Datasheets carefully. In the ’

following, crucial items are underlined plus additional

items are given:

For soldering please read carefully the corresponding

Section in the User’s Guide of respective Datasheet.

Make sure that maximum temperatures and exposure

times are respected. In case the PCB passes through

multiple solder cycles (as is the case for e.g. PCB that

are assembled on top and bottom side), it is

recommended to assemble the SHTxx only in the last

solder cycle. This is to reduce risks of sensor pollution.

It is important that “no clean” solder paste is used and -

no board wash is applied once the sensor is assembled

to the PCB.

Produkt Specifikationer

Mærke:	Sensirion
Kategori:	sensor
Model:	SHT21

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