English Abstract In this report an overview is presented of the
operating results of the automatic measuring equipment and of the data
acquisition system of the Netherlands National Air Quality Monitoring
Network in the years 1987 and 1988. The measuring equipment for sulphur
dioxyde including a new monitor scored a number of failures of 0,92 a year
only. As a result of a modification of one of the monitor's electrodes the
equipment for carbon monxyde showed less defects. The mean number of
failures in the equipment for ozone is higher than in the old network. This
score is attributed tot the poor quality of the Rhodamine B discs used in
the monitors. The high failures's number for the equipment for nitrogen
oxydes is related to service and maintenance. The results for the equipment
for wind velocity and for wind direction are good. During 1987 and 1988 the
failure's number for the data acquisition combination modem and
stationprocessor are 0,97 and 0,81 respectively. In general, the
performance of the network can be described by two parameters the net
effieciency of the equipment and the gross efficiency. Net effieciencies
are higher than in previous years for sulphur dioxyde, carbon monoxyde and
for nitrogen oxydes. Net effieciency of the ozone equipment is about the
same in the new network and in the old one. Network's gross efficiency is
92%.
