Magnesonics / Level Switches
SureTest™ Rooftop
Local Manual Switch Test — No Pressure Boundary Break Required
The Jerguson® SureTest™ Rooftop is a local, manual check feature for external cage and top mount level switches. It allows the operator to simulate a high level condition in order to check the operation of the switch — without breaking the pressure boundary. By extending the pressure tube and raising the position of the switch enclosure, the SureTest™ housing is installed between the switch enclosure and the chamber or tank.
The SureTest™ Rooftop is also available under the MagneSonics® brand as required based on approved vendor specifications.
How It Works
Within the SureTest™ housing is a high-strength, rare earth magnet that surrounds and moves along the outside of the pressure tube. Inside the pressure tube, connected to the primary magnet within the switch enclosure (responsible for actuating the switch mechanism), there is another high-strength, rare earth magnet that moves with the level.
By pulling down on the handle, the arm within the housing pivots up. Directly attached to the end of the arm is the magnet external to the pressure tube, which is pulled up with the arm. When the external magnet comes into proximity with the internal magnet, they couple and start to move up together. Since the internal magnet is tied to the primary magnet, the entire assembly is lifted as it would be with a rising fluid level. This motion causes the primary switch magnet to pass and actuate the secondary switch magnet.
Releasing the handle allows the springs within the SureTest™ housing to reverse the motion, resetting the switch and returning the unit to its original position.
Key Benefits
No Pressure Boundary Break
Verify switch operation without opening the process or depressurizing the vessel. Maintains process integrity during testing.
Local Manual Operation
Simple pull-handle operation at the switch location. No special tools or instruments required.
Positive Switch Verification
Simulates actual high level condition using the same magnetic coupling mechanism as the process. True functional test of the switch.
Automatic Reset
Internal springs automatically return the SureTest™ to its normal position when the handle is released, resetting the switch.
Compatible With
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