A
Yes, they can be used outside.
However, when the sensor is used outside, since
there are many factors which generate a thermal change, it is more difficult to use the sensor outside
than inside.
When sunlight and wind directly contact the sensor, an output may occur by reacting to
the change in temperature caused by such factors.
Install the sensor in a location where there is
no direct contact from sunlight and wind, and where there is no condensation.