Filter Minder variable-output pressure sensors monitor vacuum, pressure and differential pressures, and give an output proportional to restriction. In addition to air and fuel filters, sensors can monitor emissions-related crankcase ventilation and diesel particulate filters. Electronics of the sensor are protected from the monitored media, so they can be used in severe-duty applications.Filter Minder variable-output pressure sensors monitor vacuum, pressure and differential pressures, and give an output proportional to restriction. In addition to air and fuel filters, sensors can monitor emissions-related crankcase ventilation and diesel particulate filters. Electronics of the sensor are protected from the monitored media, so they can be used in severe-duty applications.