Wednesday, April 25, 2018

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Discrete Process Measurement - Flow Switches

A flow switch is one detecting the flow of some fluid through a pipe. Flow switches often use “paddles” as the flow-sensing element, the motion of which actuates one or more switch contacts. 

Recall that the “normal” status of a switch is the condition of minimum stimulus. A flow switch will be in its “normal” status when it senses minimum flow (i.e. no fluid moving through the pipe).

 

flow switch symbols showing normally open and normally closed symbols

A simple paddle placed in the midst of a fluid stream generates a mechanical force which may be used to actuate a switch mechanism, as shown in the following photograph:

A simple paddle placed in the midst of a fluid stream generates a mechanical force which may be used to actuate a switch mechanism
 
 

 
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