Delta Controls - Model 625 - Flow Switch Detects Ultralow Flows - Datasheet

The Delta Controls Model 625 Flow Switch detects ultralow flows for 0.25 inch to 1.0 inch (6 mm to 25 mm) pipelines. Applications include flow protection, safety monitoring, purging for explosion proofing, as well as detection of additives, oiling, purging, etc with a low pressure drop at 35 times detected flow rate. It produces on/off switching actions at a preset rate of flow and is field adjustable. The flowing fluid passes through the variable piston annulus and/or the adjustable bypass valve. Increasing differential pressure causes the piston to move and compress the range spring. When the piston magnet is carried to the switch magnet, the switch magnet attracts and the output snap switch actuates. The size of the bypass valve opening determines the flow rate switching point.