Sealed & Suspended Level Switch

Suspended Level Switch

The Sealed and Suspended Dynatrol® Detector is designed for high point level detection of bulk solids. For problem applications, such as those associated with angle-of-repose, this configuration provides reliable operation in hard to reach locations.


  • Versatile: The sealed and suspended construction is available for the DJ and G-Series Dynatrol® Detectors.
  • No Adjustment Needed: All level switch components have been constructed for long operating life and require no field adjustments.
  • Excellent option when wall mounting the level switch is not practical

CL-10DJ Sealed and Suspended Specifications

  • Explosion Proof: CSA NRTL/C approved for Class 1, Group D, Division 1
  • Temperature Rating: 350°F
  • Pressure Connection: 3/4 inch NPT
  • Conduit Connection: 1/2 inch NPT
  • Material: Stainless Steel

EC-501A Control Unit Specifications

  • Explosion Proof: CSA NRTL/C approved for Class 1, Group D, Division 1
  • Voltage Supply (Nominal): 120 volts - 50-60Hz
  • Also Available in 240 VAC and 24 VDC
  • Power Consumption: 5 VA
  • Temperature Rating: 125°F Maximum
  • Contacts: SPDT 2A @ 120 VAC (Non-Inductive)

Principle of Operation

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 AC 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.

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