5
Operating Instructions
Precipitation Sensors (15188)+(15188 H)
(15188) Precipitation Sensors
Operating Instructions
Initial operation
If the sensor system has been completely mounted and
electrically assembled, the sensor will be ready for opera-
tion. The operational check has to be performed.
Maintenance and operational check
The precipitation sensor is nearly maintenance-free. The
sensor should be checked and cleaned periodically in or-
der to guarantee its proper operation, since dirt accumula-
tion may cause errors of measurement. The time interval of
cleaning depends on the local conditions.
The
operational check
of the sensor may be performed by
the use of artificial precipitation. The volume of a 200 cm³ resp.
400 cm³ (by 4 cm³ buckets ) test container of water must be
conducted into the collecting funnel through a nozzle in such a
way that the drops fall into the funnel beside the outlet. The
nozzle of the test container (approx. diameter 0.6 mm) should
be adjusted to allow a complete water run out into the funnel
within 10 to 12 minutes.
After the artificial precipitation has gone through, 100 ± 2
bucket tippings should have been counted.
Rinse the sensor thoroughly for cleaning. Clinging parti-
cles of dirt in the collecting funnel or outlet pipe may be re-
moved with a piece of wood.If unsatisfying measurement
results occur after this cleaning procedure, the tipping buck-
et should be disassembled for cleaning.
Absolute care must be taken not to damage the
tipping bucket!
The dismounted tipping bucket can be cleaned by placing
it in warm water with some scouring material and by care-
fully scraping off unwanted dirt using a small piece of
wood.
