Positioning The Weather Station; Wsc11 Connection - Priva Compass Installation Manual

Priva
Air pressure
Absolute air pressure is measured with a piezoresistive MEMS sensor.
Time / date and geostationary data
The WSC11 has a GPS receiver with a built-in RTC (Real Time Clock). This allows it to receive the
position of the WSC11 (degree of longitude/latitude, local altitude) time (UTC) and date. The GPS
receiver does not need alignment. The built-in RTC is buffered with a backup capacitor and retains
its data without a voltage supply for a period of minimum 3 days.
Position of the sun (elevation / azimuth)
On the basis of the GPS data the current sun position is calculated every second.
Humidity measurement
A built-in hygro-thermosensor is used to measure humidity levels. The sensor uses a small air
exchange and responds to changes in humidity within seconds. The relative humidity and air
temperature are used to calculate absolute humidity and the dew-point temperature.
Inside temperature of housing
A silicon temperature sensor measures the temperature inside the housing.

Positioning the weather station

To obtain representative measurements, keep in mind the following when selecting a location for
the weather station:
• Make sure that the weather station sticks out approximately 2 metres above the greenhouse
roof or shed roof.
• Do not position the weather station in the vicinity of, or in the shade of, buildings or trees for
example.
• To limit the effect of side-wall warming on the weather station, you should position the weather
station:
• not in the vicinity of a heat source such as chimneys or ventilation openings;
• in the northern hemisphere on the north side of the side-wall, or in the southern hemisphere
on the south side.
• Do not install the weather station in the vicinity of ceiling sprinklers.
• Install the weather station in such a way that it is not obscured by shadows. Bear in mind that
shadow propagation changes throughout the day.

WSC11 Connection

You can connect the WSC11 directly to the Priva Blue ID controller via an RS485 connection.
The WSC11 is supplied with a 15 metre cable. If the distance is greater than this, you must extend
the cable and take measures to ensure a stable connection.
Connection (max. 15 metres)
For distances up to 15 metres, you can connect the WSC11 directly to the Priva Blue ID controller
and to a 24 VDC power supply.
The power supply and the data bus are not electrically isolated.
44 Installing Priva Compass - 00.014