Automatic Centralized Coolant Tank Maintenance System - Page 2
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  1. #21
    Join Date
    Jun 2013
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    Quote Originally Posted by kunalv View Post
    Agreed. Refractometers cannot be provided on each machine. What we have decided so far is we will draw a certain quantity of coolant from each machine into our 'Measurement tank' where a refractometer would analyze the concentration & feed to the PLC. The PLC would then actuate valves & a pump to deliver appropriate quantity of coolant & water to the tank to maintain concentrations at desired levels.

    Having said that, I have a few queries which I would really appreciate if you guys could throw some light on :-

    1. Drawing liquid from the machine coolant tank into my measurement tank will require a pump. Now I am not sure if I have to install a pump next to each coolant tank (cumbersome), or my centralized unit will have a pump that will draw liquid from number of machines (what about the suction head? as the machine may be a good 50 feet away!). Which type of pump would be suitable for such an application?

    2. After measuring the concentration, I have to feed coolant at appropriate concentrations back to the Coolant tank. I guess delivering pre-mixed coolant (coolant mixed with water at required concentration) would be better than delivering coolant concentrate & water separately into the coolant tank right?

    3. How do I measure & control the flow rate of liquid? Flow-meters are expensive.

    Any help would be greatly appreciated. Thanks
    Take care as to how you introduce your coolant concentrate. Some coolants are picky as to how they need to be mixed.

  2. #22
    Join Date
    Jun 2019
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    Apologies for the long hiatus.

    We're still working on the project and have now encountered a new problem. So, the coolant concentrate & water mixture has to be fed to the machine tank in a mixed, emulsion form at a particular concentration as per the requirement of the process.

    Now I have been trying to find out ways to do this, and all I could find so far are these Venturi Proportioners / Mixers that work purely on Venturi principle. But for this to work, you have to manually turn the knob to set the desired concentration.

    I was wondering if there is a way to automatically set the required concentration by a PLC on a valve/pump that meters the desired concentrate as per the set concentration.

    Any help would be appreciated. Thanks

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