Milwaukee MA 957 CO2 Regulator Instuctions - Page 2 - The Planted Tank Forum
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post #16 of 22 (permalink) Old 09-01-2015, 09:18 PM
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Originally Posted by FatherLandDescendant View Post
Some diffusers need a minimum pressure to operate, so yes working pressure (right hand gauge) can matter in certain applications. If you close the needle valve just until it stops (DO NOT tighten it after it stops), turn on the tank, then turn the center knob until the right hand gauge gets to the operating pressure you want, then open the needle valve to the bubble count you want, you'll be set.

If you follow their directions you'll be forever trying to get the regulator set to a stable pressure and bubble count. Following their directions, when the solenoid closes the pressure in the regulator will go up, when it opens it'll dump a CO2 charge then taper off. This can be a problem for those who run controllers, we (I do at lest) who run controllers often run them right on the verge of gassing our fish, that sudden dump can succeed in doing just that.
Oh, so having the needle valve closed first instead will help prevent that sudden dump when the tank nears the end? I hate when the tank does that.


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post #17 of 22 (permalink) Old 09-01-2015, 10:07 PM
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Oh, so having the needle valve closed first instead will help prevent that sudden dump when the tank nears the end? I hate when the tank does that.
Don't know about that, it SHOULD slow the release down though. A controller should,in theory, eliminate ETD. I've not had a catastrophic dump yet.


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post #18 of 22 (permalink) Old 03-10-2016, 06:00 PM
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How I am having a similar issue. I have done everything Tech support has said
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post #19 of 22 (permalink) Old 03-10-2016, 06:59 PM
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Sorry i did not finish. I know I am old and blind, how do you count the bubbles? Has someone posted what 1-3 bubbles per minute looks like, even though i can't. And yes I can count past ten, even twenty if i take my shoes off.
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post #20 of 22 (permalink) Old 01-22-2020, 07:16 PM
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Originally Posted by FatherLandDescendant View Post
Some diffusers need a minimum pressure to operate, so yes working pressure (right hand gauge) can matter in certain applications. If you close the needle valve just until it stops (DO NOT tighten it after it stops), turn on the tank, then turn the center knob until the right hand gauge gets to the operating pressure you want, then open the needle valve to the bubble count you want, you'll be set.

If you follow their directions you'll be forever trying to get the regulator set to a stable pressure and bubble count. Following their directions, when the solenoid closes the pressure in the regulator will go up, when it opens it'll dump a CO2 charge then taper off. This can be a problem for those who run controllers, we (I do at lest) who run controllers often run them right on the verge of gassing our fish, that sudden dump can succeed in doing just that.

You're absolutely right about this. It's why I'm here.
I have a brand new MA957 and followed their directions to install. I also saw when the solenoid kicked open there was a large rush of gas no doubt at the pressure indicated on the right gauge. It makes sense that the needle valve should be the final control. If there was an EOTD event (and I have no evidence this one would do that, don't want to find out), it's the needle valve that would continue to restrict gas flow.
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post #21 of 22 (permalink) Old 01-26-2020, 05:20 AM
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I find it kinda silly that they still sell this unit with a faulty gauge. I found their support to be kinda difficult. The web ( i can't remember which site steered me correctly) showed me how to dial in my needle valve to get my plants happy. Great price for a decent unit, just poor instructions from the manufacturer.
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post #22 of 22 (permalink) Old 01-26-2020, 01:17 PM
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When I was new with Milwaukee, I had beginning of the tank dump, not end of it. Before I left for a 10 day vacation, I replaced the CO2 cylinder as it was about running out of gas. I was careless and didnít spend enough time to observe and assure the CO2 despensing rate is stabilized. I returned home and noticed a stench of dead fish as all 10 lb of CO2 was dumped in less than 10 days. The fish had decayed for so long that the water had turned into stenchy fish soup. I didnít lose any plants though as they were over fed with CO2 except for exceccive algae due to death of all algae eaters.

Adjusting Milwaukee bps is tricky requiring dual adjustment of the 2nd valve and needle valve due to its inability to handle high back pressure.. Therefore, Milwaukee recommends the use of low pressure reactor and against using high pressure ceramic diffuser. Milwaukee instructs using the 2nd valve as the primary adjustment. Big mistake. I followed Milwaukee instructions literally, leaving the needle valve wide open that led to dumping the entire tank of CO2 due to pressure destabilization. The safe way should be the opposite, using the needle valve as the primary control gate keeper against dumping.

Milwaukee is only cheap, but poorly designed and made. My other regulator is Ista I bought from Big Al, which is much easier to control and can handle high back pressure.. It requires adjustment of only the needle valve, as the pressure of the 2nd valve is prefixed in the factory.
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