Vibration sensor for fluid leak detection

A vibration sensor, comprising:

• a sensor base to couple to a vibration source;
• a piezoelectric transducer coupled on a first side of the transducer to the sensor base;
• at least one conductor coupled to the piezoelectric transducer;
• and
• a seismic weight defining a cavity into which the piezoelectric transducer is partly disposed such that the seismic weight is positioned on a second side of the piezoelectric transducer;
• wherein the sensor base, the piezoelectric transducer and the seismic weight are aligned along an axis and arranged so that relative movement between the sensor base and the seismic weight arising from the vibration source, including small compressions and bending moments arising from vibrations transmitted through the sensor base, causes a current to be generated in the piezoelectric transducer and an output signal corresponding to the generated current is detectable on the at least one conductor.