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Jerguson Top Mount Displacer Level Switch

The displacer element is suspended on a stainless steel cable attached to a spring. The displacer is always heavier than its equivalent volume of the liquid in which it is to operate, and therefore will always extend the tension spring. Hanging freely in air, the spring extends to a predetermined length, limited by a mechanical stop to prevent overstressing. Attached to the spring is the magnet assembly which is free to move up and down as the spring . extends or contracts.

As rising liquid submerges the displacer, a buoyant force is created equal to the weight of the displaced liquid volume. This buoyancy force reduces the apparent displacer weight, contracting the spring, and moves the magnet up\yards inside the pressure tube actuating the switch mechanism. This simple principle also operates a single switch over a very wide differential by simply providing the buoyancy force from two displacers instead of a single displacer.

Two switch models are available for either two alarm applications, two narrow differentials, or for pump control with appropriate wide differentials. All models are fully field adjustable by simply resetting the displacers on the cable at the desired switch actuation point.

Features:

• Tri-Magnet Switching
• Vibration Resistant
• Pump Control
• Multi-Point Alarm
• T316 SST Trim

Jerguson displacer operated switches are ideal for sump and other top mounted applications such as low level alarm in deep tanks. Their principle of operation also makes them suitable, in a modified form, for very high pressure or low S.G. applications.

The four typical displacer arrangements shown in the model selection guide cover the most common applications. However should you have a special configuration requirement, please consult the factory.