Magnetic temperature gauges- paul-ryan.info Sensor Armature Variablefield coil Earth Tosensor Constantfield coil Needle Calibrated scale 12vpowersupply
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The needle has a soft iron armature at its pivot, which moves by a certain amount depending on the strength of the magnetic field between the two wire-wound coils. The strength of the field depends on the size of the current passed into the coil from the sensor unit.

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