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Thread: Flow meter duty cycle?

  1. #1
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    Flow meter duty cycle?

    I'm looking for a decent flow meter for my wire feeder and found a Victor on Amazon but it's telling me that it has a 20% duty cycle for CO. I had no idea that flow meters or regulators even had duty cycles at all. Can someone explain how that works?
    Thanks
    Glen

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  2. #2
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    Re: Flow meter duty cycle?

    CO2 will freeze a regulator/flowmeter if you're doing any amount of welding. You can get special flowmeters for CO2 or get inline heaters to use with them. Some people have used a light bulb to prevent freezing.

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    Re: Flow meter duty cycle?

    That makes sense. Same issue with C25?
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    Re: Flow meter duty cycle?

    I have been using CO2 with a basic regulator for years and have had zero issues with freezing.
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    Re: Flow meter duty cycle?

    Aside from the freezing/duty cycle, they don't list what the outlet pressure is for that model. The spec sheet just says "preset" but not what that figure is. Normally when they don't list the output pressure it's 50PSIG.

    The slightly more expensive Harris is the 0781...and they clearly list it as being 25PSIG outlet. I have one of those on my MM252 and have used it on a TIG as well...worked well. At that price point I slightly prefer the Harris 355-2 as it's 20PSIG output...and it's also made in the U.S. I don't recall if the Harris 0781 is made in the U.S. or not.
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    Re: Flow meter duty cycle?

    Ok, I'm a total novice here. Explain what difference the output pressure makes.
    Thanks
    Glen

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    Re: Flow meter duty cycle?

    Quote Originally Posted by ArcTan View Post
    Ok, I'm a total novice here. Explain what difference the output pressure makes.
    Thanks
    With the higher pressure output flow meters you get a pretty big blast of gas when you hit the trigger. It probably wastes a bit of gas compared to the lower pressure flow meters, but it's mostly just annoying. It's not really a big deal with MIG, but is very noticeable with TIG. Once I got spoiled with the lower pressure flow meters I found I noticed it more...again, not a huge deal, but for a few bucks I'd go with a lower pressure setup.
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  9. #8
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    Re: Flow meter duty cycle?

    C-25 doesn't freeze the regulator. Think of CO2 as being similar to propane. It's basically boiling at a very cold temp. inside the cylinder and that creates the pressure. In colder temps using high withdrawal of propane will also freeze up. Here's a couple options. Victor has some special flowmeters that have cooling fins but they are more expensive.

    https://www.arc-zone.com/co2-heated-...h?cPath=7_746&

    https://www.arc-zone.com/co2-heater-...5?cPath=7_746&

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    Re: Flow meter duty cycle?

    Quote Originally Posted by Welder Dave View Post
    Victor has some special flowmeters that have cooling fins
    "Heating" fins...?

    (Come to think of it, I guess they'd "cool" the air in the room...by drawing the heat into the C02!)
    Last edited by Kelvin; 11-05-2020 at 07:56 PM.

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    Re: Flow meter duty cycle?

    Thanks for all the info and advice. I think I'm going to go with a Harris 351. I don't think I'll be using straight CO2 so shouldn't have to worry about freezing at this point.
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    Re: Flow meter duty cycle?

    You won't have any problems with freezing while welding and using CO2. I've used it for close to 40 years now and have never had a single problem with it freezing. With the preset regulators for using CO2 for air tools, airing up tires and such, then a bit of freezing occurs but even then it's not enough to bother any thing. I always have a cylinder on every truck, equipped with a 150 psi regulator for using as air pressure and have little problems out of them.

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    Re: Flow meter duty cycle?

    Quote Originally Posted by Broccoli1 View Post
    I have been using CO2 with a basic regulator for years and have had zero issues with freezing.

    He lives in Vermont, you live in LA, totally different scenarios. I can weld with co2 all day long in the winter with no problems, he might have problems right out of the gate because it is below freezing there.

  15. #13
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    Re: Flow meter duty cycle?

    Cooling fins as in a heat sink. CO2 regulators freezing is enough of a problem they make special regulators for it. As previously stated these style are a little pricey.

    https://store.cyberweld.com/visrco2re.html

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    Re: Flow meter duty cycle?


    Kelvin


    Quote Originally Posted by Kelvin View Post
    "Heating" fins...? (Come to think of it, I guess they'd "cool"
    the air in the room . . . by drawing the heat into the C02!)
    Back - in the day - I'd burn 40# plus .045 wire in an eight
    hour shift.

    The Power Box was 100% duty-cycle - and gassed with CO2.
    The regulators had enormous concentric fins - just as you
    have described . . . to heat the chill . . .

    Quote Originally Posted by ArcTan View Post
    Thanks for all the info and advice. I think I'm going to go
    with a Harris 351. I don't think I'll be using straight CO2
    so shouldn't have to worry about freezing at this point.

    ArcTan


    Your choice is good . . .

    hth


    Opus



    .

  17. #15
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    Re: Flow meter duty cycle?


    ArcTan
    - per - Welder Dave . . .

    Quote Originally Posted by Welder Dave View Post
    Cooling fins as in a heat sink. CO2 regulators freezing is enough of
    a problem they make special regulators for it. As previously stated
    these style are a little pricey.

    https://store.cyberweld.com/visrco2re.html
    These are them - and, you don't need one . . .

    best wishes . . .


    Opus






    .
    Last edited by OPUS FERRO; 11-05-2020 at 10:26 PM. Reason: . . . form . . .

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