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System for treating fluids, especially water, in a pipe to resist scale deposits from building up in the pipe, includes a field generating coil (10) mounted exteriorly of the pipe, an electronic circuit (14) for energizing the coil to develop an alternating electromagnetic field in the fluid, a sens

System for treating fluids, especially water, in a pipe to resist scale deposits from building up in the pipe, includes a field generating coil (10) mounted exteriorly of the pipe, an electronic circuit (14) for energizing the coil to develop an alternating electromagnetic field in the fluid, a sensor (18) for sensing a parameter related to the functioning of the system and for generating a parameter dependant signal, a feed back circuit for feeding back the parameter dependent signal to the electronic circuit to control the circuit, wherein the sensor comprises a field measuring coil (16) mounted exteriorly of the pipe near the field generating coil, the feed back circuit comprises the electronics which together with the measuring coil acts as a field strength meter.

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1. System for treating fluids in a pipe to resist scale deposits from building up in the pipe, comprising: a field generating coil mounted exteriorly of the pipe; an electronic circuit for energizing the field generating coil to develop an alternating electromagnetic field in the fluid; a senso

1. System for treating fluids in a pipe to resist scale deposits from building up in the pipe, comprising: a field generating coil mounted exteriorly of the pipe; an electronic circuit for energizing the field generating coil to develop an alternating electromagnetic field in the fluid; a sensor for sensing a parameter related to the functioning of the system and for generating a parameter dependent signal; a feed back circuit for feeding back said parameter dependent signal to said electronic circuit to control said electronic circuit; wherein the sensor comprises a field measuring coil mounted exteriorly of said pipe near the field generating coil; and the feedback circuit comprises field strength measuring electronics which together with said measuring coil act as a field strength meter. 2. The system according to claim 1, wherein the field measuring coil is positioned alongside the field generating coil with no or small intermediate distance. 3. The system according to claim 2, wherein the electronic circuit for energizing the field generating coil comprises an amplifier and a signal generator, and the amplification value is adjusted as a function of the signal from the field strength meter. 4. The system according to claim 1, wherein the electronic circuit for energizing the field generating coil comprises an amplifier and a signal generator, and the amplification value is adjusted as a function of the signal from the field strength meter. 5. The system according to claim 1, wherein the feed back circuit comprises a band filter.