It takes a variety of components to make a sensor appropriate for targeted applications and environments. To protect Sensirion’sSHT2x humidity and temperature sensor from water, dust, dirt and various contaminants, the SF2 filter cap is such a component. Made of PBT (Polybutylene Terephthalate) the filter cap has an integrated filter membrane. With a filtration efficiency of 99.99% of all particles >0.1μm, the filter cap is designed to keep response time low. The SF2 fits exactly to the external dimensions of the SHT21 and also serves as an adaptor for mounting the humidity sensor directly into the wall of housing. The use of an o-ring seal results in a waterproof mounting solution that allows protection according to IP67 to be achieved.
For more information on Sensirion’s SF2 filter cap, click, here.