Top Mount Level Switches

Features

• → Tri-Magnet Switching
• → Vibration Resistant
• → Pump Control
• → Multi-Point Alarm
• → T316 SST Trim
• → Fully Field Adjustable

Operation

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 operates, 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 or 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 moving the magnet upward inside the pressure tube to actuate the switch mechanism. Two switch models are available for either two alarm applications, two narrow differentials, or for pump control with appropriate wide differentials.

Features

• → Tri-Magnet Switching
• → Vibration Resistant
• → T316 SST Trim
• → Fully Field Adjustable
• → ASME B31.1/B31.3 Design

Applications

Top mount float operated switches are used where side connections are not practical or available. Suitable for tanks, vessels, and process equipment requiring high or low level alarm, pump control, or safety shutdown. The float is guided by a stainless steel cable and actuates the tri-magnet switch mechanism as liquid level changes.