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The Multilogger System consists of a Logger Software application, a
USB- or LAN or receiver module and one or more sensors, each inclu-
ding a transmitter system.
A USB- or LAN cable connects the receiver to the computersystem or
to the LAN network. The Logger application can synchronize the sen-
sor data from several receivers.
For the Multilogger system many different sensors are already availa-
ble. The sensors can measure temperature, humidity and CO2
The Multilogger application at the computer displays all sensor data,
which have been transferred by temperature sensors to the receiver.
Temperature sensors continuously registrate temperature and report
new values to the USB-receiver at intervalls of ca. 45 seconds.
Each sensor in the sensorlist reports the date and time stamp for the
most recent measurement data set. The right side window displays a
continuous curve for the registrated temperature for the selected sen-
sor.
Sensors and receiver use a wireless communication system, working
at 433MHz. This frequency is freely available for communication at
transmitting powers under 10 milliwatts.
Depending on surrounding building constructions, the allowed 10mW
power level allows a transmission range of 20-40 meters inside
buildings, the open field range is much higher.
Temperature sensors may be located inside or outside buildings, at any
place where a registrated overview of temperature curves is desired.
Unreliable signal levels may be improved substantially by slightly
modifying the sensor’s position or the receiver’s location.
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