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Product description
The temperature monitoring in storehouses for grain is mostly still done manually,
this means that every measuring point is controlled by an employee at least once a
day. This procedure is very cost and time consuming.
The solution is the wireless measurement system. Every measuring point can be
equipped with up to six temperature measuring sensors. So it can be used area-wide
in storehouses for grain, storehouses for bulk goods or similar warehouses. Depending on the measuring interval, a total of up to several hundred measuring points is
possible. In order to be able to achieve a sufficient radio coverage or higher ranges,
repeaters can be used. They extend the operational range of the wireless measurement system by far.
Modules of the wireless measurement system
Base module
The base module receives the transmitted data of the sensor modules and transfers
these over a RS232, USB, LAN or WLAN interface to a PC or an IP network.
The RS232 interface is available at all module versions.
The LAN or WLAN interfaces make the connection to an Intranet or to the Internet
possible and therewith the worldwide inquiry of the measurement data.
At the combination LAN / RS232 (alpha WSN BM 110), the voltage supply will be
realized over an external pluggable power supply unit or over the LAN connection
(PoE – Power over Ethernet) if an appropriate PoE voltage supply is installed in the
LAN.
At the combination USB / RS232 (alpha WSN BM 120), it is possible to realize the
voltage supply over the USB interface. Alternatively, the voltage supply can also be
realized over a power supply unit.
At the combination WLAN / RS232 (alpha WSN BM 130), the voltage supply has to be
realized over an external power supply unit.
Sensor module
The sensor module is for the connection of different sensors.
The acquired data is transmitted to the base module by radio and from there, they
are transferred to a PC.
An inquiry as well as setting of the parameters of the sensor modules from base
module (polling) is also possible.
The voltage supply is realised over an internal 3.6 V battery (lithiumthionylchloride,
size 2/3 A). In case the battery voltage is falling below the minimum battery voltage, a message is sent to the base station. The battery should be changed then. An
intelligent power management guarantees a long battery lifetime up to several years
(depending on the size of the network, the propagation conditions and the measuring
interval).
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