GAMMA
instabus
Technical Product Information
February 2019
Weather Station (GPS) AP 257/22
5WG1 257-3AB22
Siemens Switzerland Ltd
DS01
Update: http://www.siemens.de/gamma-td
Building Technologies Division
International Headquarters
Theilerstrasse 1a
Siemens AG 2019
CH-6300 Zug
Subject to change
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Location and Function of the Display and
Operating Elements and of the Sensors
Figure 1
1 Spring-force auxiliary voltage terminal AC 20V / DC 24V
2 Slot for cable connection to the precipitation sensor in
the casing lid
3 GPS antenna
4 LED for GPS signal
5 Bus terminal
6 Commissioning button
7 Commissioning LED
8 Brightness sensor
Figure 2
1 Rain sensor
2 Temperature sensor
3 Wind sensor
4 Brightness sensor
Mounting and wiring
Location
Select a position on the building where wind, rain and
sunshine can be recorded by the sensors without im-
pairment. No structural elements should be mounted
above the weather station from which water could con-
tinue to drop on to the precipitation sensor even after
rain or snow has stopped. The weather station should
not be shaded by the building or e.g. trees. There must
be at least 60 cm free space around the weather station
to allow correct wind measurements and to prevent the
station from being snowed in. It is recommended to
install the weather station on a mast. It should be en-
sured that the highest point of all parts of buildings near
the weather station is 60 cm below the wind sensor of
the mounted weather station.
Magnetic fields, transmitters and interference fields from
electrical consumers (e.g. fluorescent lamps, neon signs,
switch mode power supplies etc.) can block or interfere
with the reception of the GPS signal.
The weather station must be mounted on a mast
(Ø approx. 50 – 55mm) or a vertical wall (see fig. 3) and
be leveled horizontally across the top (see fig. 4).
The wind sensor of the weather station shall point to the
cardinal point of the sun at noon, if possible. This means
South in the northern hemisphere, and North in the
southern hemisphere (see fig. 3).
Figure 3
Cardinal point of the sun at noon
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