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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 rate of liquid exceeds or falls below the set rate, the SPDT contacts can turn on one circuit and cut off the other at the same time. The switch is usually used in places requiring interlocking or Repeatability error is about 2.5%, ensure high stability of products. IP54 level, more safer to use. Perfect for water treatment system, central air conditioning, water cooling unit.