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Topic # 159985 19-Dec-2014 10:03
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I am looking for a dosing pump that monitors flow-rate of the water it is pumping additive into and adjusts dose rate to ensure a constant concentration of additive.  Needs to be 12v DC.

I have an Arduino project in mind to achieve the same thing.  But it would be simpler if an off the shelf solution was available for a reasonable price.

Application is addition of detergent to water at a constant concentration.  The flow rate of the water will be variable.





Mike

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Vocus

  Reply # 1200406 19-Dec-2014 10:09
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If you google "automatic detergent doser" there's a heap of them out there...

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  Reply # 1210215 7-Jan-2015 22:31
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What about a good old fashioned venturi? i used them on carwashs for dosing chemical. of course the venturi system has limits depending on how big your flow rate extremes are

 
 
 
 


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  Reply # 1210385 8-Jan-2015 10:05
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Is this for a Commercial Environment or at Home? 

All dealings I have had with dosing pumps are the peristaltic pumps for the pool industry.

http://www.iancoombes.co.nz/Menu/Chlorine-dosing-pumps.php



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  Reply # 1212287 12-Jan-2015 09:51
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Thanks for this, you are right, there are heaps of detergent dosing pumps - and also aquarium dosing pumps. 

But ... these tend to be fixed rate or fixed volume pumps.  I'm looking for something continuous and dynamic.  I.e. senses water flow rate and adjusts dosing speed to provide a constant concentration of additive.

ubergeeknz: If you google "automatic detergent doser" there's a heap of them out there...




Mike



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  Reply # 1212290 12-Jan-2015 09:53
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Venturi is what I am using now.  It doesn't work very well, as water pressure and flow rate vary.

This is not for commercial use, it's for washing down my boat and motors.  Has to deal with varying water pressure and volume depending on where I am.

floydie: What about a good old fashioned venturi? i used them on carwashs for dosing chemical. of course the venturi system has limits depending on how big your flow rate extremes are




Mike

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  Reply # 1212873 13-Jan-2015 01:05
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Here you go
http://www.trademe.co.nz/business-farming-industry/farming-forestry/other/auction-830926658.htm
Yes it is expensive but is doesn't even need any power. At least you now know what to Google to find it cheaper.

Also I sure hope you have proper backflow prevention on your venturi system if it is supplied from a council water supply. As what you are doing is counted as a high hazard under the backflow rules. This is to avoid any possible chance of your detergent chemicals ending up in the council system.







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  Reply # 1213038 13-Jan-2015 10:26
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Are you sure this self adjusts to match flow rate?

I am talking about a hose end venture dispensing system. There are lots of people using similar for lawn herbicides, liquid fertilisers, detergents and house cleaning products (wet 30 seconds etc).  I'm guessing most domestic properties don't have back flow prevention.

Aredwood: Here you go
http://www.trademe.co.nz/business-farming-industry/farming-forestry/other/auction-830926658.htm
Yes it is expensive but is doesn't even need any power. At least you now know what to Google to find it cheaper.

Also I sure hope you have proper backflow prevention on your venturi system if it is supplied from a council water supply. As what you are doing is counted as a high hazard under the backflow rules. This is to avoid any possible chance of your detergent chemicals ending up in the council system.




Mike

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  Reply # 1216393 17-Jan-2015 00:10
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The manufacturer claims on their website that it does. Biggest advantage over a venturi is that you can put a tap on the outlet. So you can have varying flow rates or no flow with constant amount of dosed chemical. I know of 1 in operation feeding water to a large printing machine that needs chemical pre treatment. (Don't know what the printing machine / press needs water for)

As for the backflow prevention, That is something I don't like. Those handheld chemical sprayers that connect to the garden hose. Glad that I have rainwater tanks on my house. As there have been some nasty backflow incidents in NZ. And many more overseas.





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