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Thread: conductivity

  1. #1
    Join Date
    Oct 2009
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    KARACHI PAKISTAN
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    403

    conductivity

    What's the ideal conductivity of the water and when should we replace?

  2. #2
    Join Date
    Jan 2008
    Location
    Brooklyn, NY
    Posts
    635

    1000 to 1200 over the conductivity of water, I think.
    You must check that before adding an alcohol, that is if you use it

  3. #3
    Join Date
    Oct 2009
    Location
    KARACHI PAKISTAN
    Posts
    403

    our tap water has a conductivity of around 1350.... so how can i decrease it?

  4. #4
    Join Date
    Jul 2010
    Location
    Моscow Russia
    Posts
    46

    Quote Originally Posted by aqazi81 View Post
    our tap water has a conductivity of around 1350.... so how can i decrease it?
    Too much minerals in the water.
    Need to use a filtels or RO system.

  5. #5
    Join Date
    Jan 2011
    Location
    Winnipeg, Manitoba
    Posts
    287

    Most of my water tanks have conductivity meters in them, with a fresh mix we hit 2500 , as soon as we start to pound the work through the number starts to increase. At 4350 if not paying attention we start to get dot slur. At 4800 plus the water sweep has doubled and it is not easy to print clean, but still prints. If time is pushing , drop half the tank and top up the conductivity usually drops back down to 3000-3200, and back in production. Running metal CTP with water straight out of the tap, using Prisco 2451 plus 2 etch. 200 line shop standard, on an 102-8c-p, mov p with alcolour, and both ryobi 3304H. Conductivity is a guide line, a press with good rollers set proper and an operator that understand printing can achive good results and not care about were the conductivity is.Good rule of thumb is, the fountion solution looks like crap and full of *@#? change it !
    FSA

  6. #6
    Join Date
    Mar 2011
    Location
    Canada
    Posts
    69

    It should state what the conductivity after water should be on the fount bottle.
    Measure the water first and then add the relevant amount of fount/sub/alcohol, whatever you use. For example if your tap water is 200 and fount should be 1000 over the tap then a good conductivity is 1200. If it starts getting 600-800 over then it would be good to change it or add some fresh.
    I find that it is more critical using an alcohol sub as opposed to alcohol and so have to keep a closer eye on it.

  7. #7
    Join Date
    Oct 2008
    Location
    retired to panama
    Posts
    408

    Wow!!! i don't know that I've ever mixed fountain solution starting with tap water with a conductivity as high as 1350. You sure your guys aren't pissing in the water supply??? You can get the conductivity down to Zero with a good reverse osmosis filtration system. If you were to start at 0 i would add solution to bring it up to app. 1000 or so. If you run alcohol the alcohol goes in after you've arrived at the 1000 with just the fountain solution. Once you add alcohol you will see the 1000 drop a couple of hundred depending on how much alcohol and how pure. As long as you water roller durometers are reasonably soft I'm thinking that you shouldn't need more than 5% alcohol on a Heidelberg.

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  9. #8
    Join Date
    Oct 2009
    Location
    KARACHI PAKISTAN
    Posts
    403

    Quote Originally Posted by turbotom1052 View Post
    Wow!!! i don't know that I've ever mixed fountain solution starting with tap water with a conductivity as high as 1350. You sure your guys aren't pissing in the water supply???
    I'm sure you wont be surprised to know that its our drinking water.... and we are still alive.... ;-)

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