Air vs Water Flow rate
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Posted by: alan ® 04/16/2007, 12:41:46 Author Profile eMail author Edit

We currently use a flow switch to detect water leakage in our system. The flow switch will activate if 80ml/min or more is detected. We are moving to testing this flow switch with air and I need to determine what air flow rate would equal water flow rate thru an orifice. Alan

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Re: Air vs Water Flow rate
Re: Air vs Water Flow rate -- alan	Post Reply	Top of thread	Forum

Posted by: jboggs ® 04/20/2007, 18:20:08 Author Profile eMail author Edit

Need much more information to be able to reply. Are you talking about some closed piping system? Or a tank somewhere? high pressure? high temperature? How do you have it set up? Are all the leaks routed to a single point that then feeds across the flow switch? Or is it set up to detect the flow of incoming "make-up" water to maintain a certain level or pressure in the system? There are many types of flow switches, and they work based on many different principles. Flow across an orifice, fluid momentum, indicator rising in a vertical tube, . . . . . . Which type do you have? They don't actually measure "flow rate". They measure some other physical parameter that varies as a result of flow, and express it in terms of flow rate. And since water and air are two such vastly different mediums, I doubt seriously if any of them are equally reliable in both.

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