For the depth sensing, what is the range for the ZED cameras in terms of measuring distances and the accuracy of the detection?

The depth range of the ZED 2 is 0.2 - 20 m (0.65 to 65 ft) for accurately detecting various objects.

You can find more information on the various specifications of ZED 2 here.

 

Various modules for more detailed explanation can be found in the links below: