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The Dynatrol Detector is suspended to the point of desired level detection. When the probe is uncovered, the drive coil drives the rod into a self-sustained mechanical oscillations at the natural resonant frequency of the rod. The pick-up coil, located opposite to the drive coil, is excited by these mechanical oscillations and produces an a-c signal voltage. This signal voltage indicates the rod is uncovered that a low level exists.

When the process media covers the rod, a dampening of the rod oscillations occurs. Consequently, the magnitude of the rod oscillations are greatly reduced and the output from the pick-up coil drops to a very low value, indicating that the rod is covered - that a high level exists.

The On/Off signal from the Dynatrol Level Detector operates a SPDT relay in the EC-501A Control Unit. The contacts of this relay can be used to actuate alarms, indicator lights or process control equipment.