Abstract: A sensor arrangement for identifying and measuring environmental parameters, in particular in flat roof structures, including a first group of functional units containing at least one sensor and a transmission/reception antenna for wireless communication, and a second group of functional units containing at least one sensor, a measurement, storage and evaluation unit, and a power supply. The two groups of functional units are accommodated in separate housings, but operatively connected to one another. The first functional group has a sensor for water in liquid form and a humidity sensor, and the second functional group preferably has at least one surface pressure sensor. A measurement network can include a group of the sensor arrangements that are controlled/monitored from a common transmission/reception unit. The installation of such a measurement network is also described.