Wireless measurement devices
Wireless sensors are composed of 2 main parts:
A transceiver unit which is able to receive and transmit data from/to the sensors by generating an electromagnetic field.
One or more sensors equipped with an antenna and an independent power supply which transmit alarms and/or take measurements.
It is possible to create a network of simplex or duplex wireless sensors.
The transmitters can be programmed to transmit their ID code, battery level and any alarms at a predetermined time interval; when a significant variation in the measured parameter is detected, this new situation is transmitted immediately.
The data transmission channel uses brief RF pulses with efficient modulation techniques which allow a high peak RF power level, necessary for the reliability of the radio connection, to be maintained, but at the same time also features a very low average power (Power Density); this means a current draw on the order of 200µA during the transmission period, which results in a long-lasting power source.