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Model 621 Datasheet 
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Application
The Delta Controls Type 621 target actuated flow switch is equipped with a body that fits directly in and becomes part of the pipeline. The inside body dimensions and end connections conform to those of the pipeline. These switches protect pumps, blowers, heat exchangers, etc. They are factory calibrated to switch at the specified flowrate. An internal adjustment allows small switchpoint changes to be made in the field. Large changes require changing the size of the target.
Operating Principle
Connection of the target to the output switch is done magnetically. A heavy-duty solid sealing tube separates the process fluid from the switch mechanism. Failures due to seal, diaphragm, and bellows leaks are eliminated. A pivoted target extends down into the flowing stream. A force is created by the flowing fluid as it strikes the target. At a predetermined velocity, the force becomes great enough to cause the target and the attractor to rotate about the pivot point. The magnet reacts to the new attractor position and the output switch operates. The target rotates back to its original position as the flow decreases; and the output switch then returns to its original position.
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