MODEL 760

EXTERNAL STANDARD VERTICAL CAGE, 1 ALARM

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762.jpg (12169 bytes) The Delta Controls Model 760 has been built for over 25 years. It is in service all over the world, including Russia, Antarctica, North Sea, Guam and Japan. Thousands of units are providing continuous, highly reliable monitoring of liquid levels and interfaces.

The Model 760 external cage mounted float actuated switches are used to provide alarm functions. These actions are produced in response to a float position as it rides up and down the surface of the process liquid level (or interface dividing line). All units are equipped with a guide bushing at the lower end of the large stroke rod. This feature keeps the float and attractor mechanism centered in the cage and prevents the float from dragging on the cage wall. Failures due to dragging, sideways binding and bent rods have historically been problems with older vertically rising float designs.

Seal welded cages are standard on most models. All units are available with a flange sealed cage, which allows access to the float and internal parts for inspection and maintenance. The flange is an ANSI design and usually carries the same pressure rating as the element assembly. Higher-pressure ratings are available. All the units are available with standard or special connection configurations; these include side/bottom, side/side, and side/side/bottom drain. All connections are available either threaded, socket welded, or flanged.

The float inside the cage floats on the surface of the liquid and rides up and down with it. An attractor is attached to the float and also moves with the liquid level. When the level rises, the attractor is move up into the field of the switch station magnet. The magnet is free to move and is pulled in against the side of the nonmagnetic sealing tube. The output switch is actuated by the movement of the magnet. Similarly, when the liquid level falls, the attractor is pulled out of the magnet. The return spring pulls the magnet back to its original position and the output switch is deactuated.