Users Manual

Operating Manual Smart Weather Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 45
10.4 Operating Modes of the Smart Weather Sensor
The power consumption of the Smart Weather Sensor can be adjusted to the properties of
the individual installation by setting the operation mode.
The operation of the power save modes however has certain constraints. These have to be
considered when designing the installation.
In normal operation, where all specified properties of the Smart Weather Sensor are fully
available, the power consumption is mostly determined by heating and fan operation.
10.4.1 Power Saving Mode 1
Following measures are active in power saving mode 1:
• The ventilation of the temperature / humidity unit is switched off
• All heaters are switched off
• The radar rain sensor (WS800-UMB, WS700-UMB, WS600-UMB, WS400-UMB, WS100-
UMB) is not working continuously. The sensor is activated once per minute for one second
(WS100-UMB: 5sec), if precipitation is detected, it remains turned on until the end of the
event, otherwise it is deactivated after this one second again.
• Compass measurement is only performed once after power up. The fan, which is
otherwise deactivated, will be switched on shortly for the time of this measurement.
• The WS700-UMB / WS800-UMB increases the measuring cycle time for global radiation
from 10 seconds to 1 minute.
Note: This setting has the following restrictions:
• With the fan switched off deviations in temperature and humidity measurement can occur
by solar radiation.
• Only limited winter operation is possible in this operating mode because any icing might
prevent the correct operation of the rain sensor or wind meter.
• The rain detection may be delayed up to 2 minutes. Short events are possibly not
detected. Thus, deviations in the accuracy of the precipitation quantity are possible.
Compared with normal operation the power consumption of a WS600-UMB can be reduced
to 10% even neglecting the heating. (during precipitation events the consumption is slightly
higher, due to the rain sensor then permanently switched on, about 20% compared to normal
operation).