Amphenol Wilcoxon PC420 4mA to 20mA Loop-Powered Sensors provide cost-effective, condition-based monitoring of trending vibration data. Amphenol Wilcoxon PC420 sensors represent the overall level of vibration by a loop current of 4mA to 20mA, where 4mA represents no vibration and 20mA represents a sensor’s full-scale vibration level. Vibration data can be incorporated with common monitoring parameters, such as pressure, temperature, or flow.