www.sensirion.com / D1

Version 4

– November 2022

17/22

6.2 Protective Cover

The SHT4x will be available with a second protective option, a removable protective cover to protect

the sensing element during sensor installation. The sensor will be delivered with the protective

cover attached such that the sensor opening is completely covered and sealed. This enables cost-

effective brush-over and spray-over application procedures of conformal coating material. Such

coating is often required in highly corrosive environments to protect solder joints. In this process

the protective cover prevents the sensor opening to be sealed by any coating and to it, the foil can

be pulled off with tweezers at the designated non-sticking flap.

The protective cover is made of polyimide making it highly resistant to chemicals and elevated

temperatures14. To ensure full functionality of the cover, when mounting the sensor, follow the

reflow soldering process as described in the Handling Instruction [2].

Figure 20. Sketch of the SHT4x with attached polyimide foil.15

7 Quality and Material Contents

Qualification of SHT4x is performed based on the JEDEC JESD47 qualification test method,

qualification report available on request. The device is fully RoHS and WEEE compliant, e.g. free

of Pb, Cd, and Hg.

For general remarks of best practice in processing humidity sensor please refer to the handling

instructions [2].

14 Up to 260 °C

15 This a preliminary sketch only and might be subject to change.