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Operating Instructions
Precipitation Sensors (15188)+(15188 H)
(15188) Precipitation Sensors
Operating Instructions
Z
P
S
S
S
M
Installation
Mounting of the sensor
The sensor must be mounted on a tube or pole with an out-
side diameter of 60 mm. A metallic extension tube with a min-
imum length of 100 mm is recommended, if a wooden pole is
used.
For easy adjustment place a spirit-level on the upper measur-
ing edge.
Attention!
Do not damage the measuring edge !
Place the sensor on the end of the pole until it fits in. By using
the allen key (4 mm) provided, tighten the screws in the mount-
ing pedestal evenly. Adjust the upper measuring edge to an ex-
act horizontal position. By doing this, the tipping bucket will
automatically be positioned vertically inside the device and will
work symmetrically to the collecting funnel.
M =
Protective covering
S =
Fastening screws
Z =
Mounting pedestal
P =
Pole/tube
Function
The weighing precipitation sensor (15188...)
measures the
rain quantity by a tipping bucket developed by Joss-Tognini, the
bearings of this have been arranged for low friction. Errors that
normally occur due to incomplete draining because of surface
tension are automatically compensated by the specific form of
the tipping bucket.
The tipping bucket can hold 2 cm³ (2 g) resp. 4 cm³ (4 g) of
water. The collecting surface of 200 cm² (WMO standard)
means that one bucket charge is equivalent to a precipitation
rate of 0.1 mm resp. 0.2 mm per square meter.
If the bucket is tipped, the reed contact that is integrated in the
sensor will be closed. This pulse output can be electrically
scanned, remotely transmitted and recorded.
A bounce-free signal can be achieved by use the correspond-
ing electrically connection. Otherwise the signal of the reed
contact can be used directly, not bounce-free, if this function
will be carried out by an appropriate data logger (e. g. TRO-
POS).
For application in snowfall regions the heater equipped model
(15188 H)
ensures all-year-round measurement. Two separate
controlled heating circuits with lowest hysteresis are provid-
ing an optimal temperature at which snowing up of the sensor
will normally be prevented and evaporation from the heated sur-
faces will be minimized.
The precipitation sensor (15188...)
is mounted on a pedes-
tal that is equipped with a connection piece and are attached
to a tube with an outside diameter of 60 mm.
The precipitation sensor (15188...)
are made of weather-
resistant aluminium and stainless steel. This ensures a long
durability.
These high-tech precipitation sensors (15188)
comply with
the regulations of the WORLD METEOROLOGICAL ORGA-
NIZATION (WMO).
measuring edge
Dimensioned drawing
fig. 1
fig. 2
