The MicroWire Sensor is a passive element: it has no data gathering on it and
doesn’t need any wiring. To be able to gather the local data around the
MicroWire, RVmagnetic uses a sensing head.
The sensing head consists of two coils: one of them is an excitation coil. It
generates a few milliamperes of the magnetic field. The second, sensing coil
gathers the response of MicroWire to the local environment, through the magnetic
field created by the first coil. The sensing head needs no contact with the
sensor directly, it can also be miniaturized into extremely small dimensions if
that’s what the application needs.