8/6/2019 Sensirion Digital Humidity Temperature Sensors - Over View New 2010 (2)

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Digital Humidity Sensors (RH&T : Relative Humidity and Temperature) Overview

Sensirions family of relative humidity and temperature sensors have become established as the industry standard -

mainly due to their high performance and integration ( CMOSens Technology ) in a miniature format. The

capacitive humidity sensors provide digital and fully calibrated output which allows for easy integration without the need

for additional calibration. The excellent long term stability has been very well perceived and the cutting edge low energy

consumption is unachieved and makes them the right choice for any remote application.

The digital humidity sensors are provided in different packaging types: SMD type ( SHT1x series ), pin type ( SHT7x series )

and the new DFN type ( SHT2x series ). The SHT1x and SHT2x are reflow solderable while pin type humidity sensors are

used for devices where flexible integration is crucial or easy exchange is necessary. The three series are subdivided

further according to different accuracy levels of humidity reading.

Any application deserves a specific type - the following table shall help to make the right choice. For detailed specification

please refer to respective datasheets.

Humidity Sensor Packaging Max. RH tolerance* Max. T tolerance* Sensor Output

SHT10

SMD 4.5%RH 0.5C Digital Sbus

SHT11 SMD 3%RH 0.4C Digital Sbus

SHT15 SMD 2%RH 0.3C Digital Sbus

SHT21

DFN 3%RH 0.4C I 2C, PWM, SDM

SHT25 DFN 2%RH 0.2C I 2C

SHT71

Pins 3%RH 0.4C Digital Sbus

SHT75 Pins 1.8%RH 0.3C Digital Sbus

8/6/2019 Sensirion Digital Humidity Temperature Sensors - Over View New 2010 (2)

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8/6/2019 Sensirion Digital Humidity Temperature Sensors - Over View New 2010 (2)

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NEW - SF2 Filter Cap for SHT21 Humidity Sensor (RH&T)

Easily mountable solution for the protection of the SHT21 humidity sensor .

SF2 filter cap protects Sensirion's humidity and temperature sensor SHT21 against water, dust, soot and other

contaminants. It consists of a single piece of PBT and a integrated filter mebrane.

The filter cap fits the outer dimensions of the SHT21 humidity sensor and allows for a compact system design. SF2 is

fixed to the PCB by plugging the four pins into corresponding holes in the PCB. If desired, they can be glued for additional

adhesion. The filter cap is designed to keep response time low. The SF2 filter cap also serves as an adaptor for mounting

the humidity sensor directly into the wall of housing. Using a sealing ring results in a waterproof mounting solution that

allows protection according to IP67 to be achieved.

Features

Filtration efficiency : 99.99% of all particles > 0.1m Protection class : IP67 Easily mountable after reflow soldering (see picture below)

Filter cap SF2

Kindly refer the respective datasheets for more details