The Delta Controls Model 621 target actuated flowswitch is equipped with a body that fits directly in and becomes part of the pipeline. The insidebody dimensions and end connections conform tothose of the pipeline. These switches protectpumps, blowers, heat exchangers, etc. They are factory calibrated to switch at the specifiedflowrate. An internal adjustment allows smallswitchpoint changes to be made in the field.Large changes require changing the size of thetarget.

Connection of the target to the output switch isdone magnetically. A heavy-duty solid sealingtube separates the process fluid from the switchmechanism. Failures due to seal, diaphragm, and bellows leaks are eliminated.