Capacitive water flow switches

C

ceady

Member
http://www.sowaytech.com/sdp/302911/4/pd-1...64-1271020.html

I came across these capacitive water flow switches online, which look promising as they basically clip onto non metallic water pipe and provide a N.O. NPN output, operating at 12-24V. I emailed the company and got a data sheet (Its 5mb so I cannot attach it here, but if your interested I'll email it to you) and some pricing (estimated around $45/ea after shipping, taxes, duties, etc.) Unfortunately there is a 50 unit minimum order. Regardless. . .

Curious to know if anyone has used anything similar, or what others use to monitor water flow. Just looking for a on/off status of flow.

Thanks,
 
This is interesting and I'll send you my Email addy in a PM and maybe post a summary here. I'm curious as to the resolution/accuracy for 'trip' point.

Shame about that 50 minimum order. If it seems like something Cocooners are interested in though I bet we could convince one of our fine vendor's here to stock them for us! ;)
 
depends on the accuracy, but the price and install is VERY attractive!

Pending looking at the specs, I'd be interested in at least two, maybe more!

--Dan
 
Of course, you could put adapter fittings to install PVC in a section of the copper pipe where the sensor would be located.
 
Is this thing a "flow" sensor or a "pipe full" sensor? I see nothing in the spec sheet about flow rate. The spec sheet always talks about distance... like it was detecting the mere presence.
 
WayneW said:
Is this thing a "flow" sensor or a "pipe full" sensor? I see nothing in the spec sheet about flow rate. The spec sheet always talks about distance... like it was detecting the mere presence.
Click to expand...

I've sent in a request to the manufacturer for more information as it is called a flow switch but is not clear whether it senses flow or empty pipe and flowing pipe. . . reading the data sheet again under the "I/O Circuit Diagrams" the "Liquid Level" option appears to be either "Present" or "None" so looks like you may be right. I'll post once I hear back from the manufacturer.
 
Looks like it is more of a level detector than flow. There are no flow accuracy specifications given. Plus notice is says mount to bypass pipes. Also it says "Sensing Liquid position: Indented mark position".

I say it is designed for sensing flow in an overflow pipe. I've never heard of capacitance being used to measure flow, only level.
 
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