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It is used to measure the dynamic state of the liquid flowing through the pipeline, such as: water, ethylene, ethylene glycol and other liquids that have no corrosive effect on copper. When the flow rate of liquid exceeds or falls below the set flow rate, the SPDT contacts can turn on one circuit and cut off the other at the same time. The flow switch is usually used in places requiring interlocking or Repeatability error is about 2.5%, ensure high stability of products. IP54 protection level, more safer to use. Perfect for water treatment system, central air conditioning, water cooling unit.