The CA-302 acceleration transducer is an online facility diagnostic vibration sensor used for motors, pumps and fans in petrochemical plants and steel and iron works. In order to achieve on-line facility diagnosis, low-cost sensors are necessary. The CA-302 is a unique low-cost vibration sensor for predictive maintenance which offers performance equal to that of conventional expensive types. It can also satisfy intrinsically safe construction conforming to IEC just by adding an explosion-proof barrier, for on-line facility diagnosis in petrochemical plants, etc.