The aim of the MAREL network is to automate the collection of data rel
ative to the coastal water quality in order to follow up the levels an
d trends of pollutant concentrations, to trigger alarms in the case of
passing pre-defined thresholds or to obtain long time series for scie
ntific needs. This article describes the subassemblies which make up t
he special characteristics of the MAREL network measurement device: th
e system for taking samples, the measuring chamber and the anti-foulin
g device.