Operating in harsh electromagnetic environments without signal loss or delays, HV Series includes 100 and 500 mV/g models for seismic monitoring that measure ultra-low levels down to 0.1 Hz. Sensing element is isolated from sensor base and casing to offset effect of high voltage and EMI often found in wind turbines and VFD/SCR controllers. For long-term stability, top-exit sensors have ceramic housings and hermetic sealing that provide isolation up to 6,000 V.