Capacitance Thickness Gauge / Displacement Gauge Frequently Asked Questions

As shown in the figure below, the sensor is positioned opposite the target object to measure the gap. At this time, the sensor's case must be electrically connected to the target object. This is because capacitive sensing uses current to measure the gap. If the impedance (resistance to electrical flow) between the sensor case and the target object is high, it will result in measurement errors. Generally, if it is below 1kΩ, it falls within the specification range.