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Aqua Computer High-Flow Flow Sensor Reading

Avathar77

Newbie

Aqua Computer High-Flow Flow Sensor Reading

Thursday, November 1st 2012, 3:12pm

Hi
I got an Aqua Computer High-Flow Flow Sensor connected to my loop and I think the flow is too low!

I have set the calibration value of the flow meter to 159 as I have seen in an article in XS forums.
It is showing the flow as 0.4 gal/min even at setting 5 of the D5 pump! which I think is too low for a loop like mine

My loop consists of
Koolance CPU 370 1.1 block
Koolance HD6970 Full cover block
1 x 480mm Alphacool XT RAD
less than 1 meter of 1/2" ID 3/4" OD tubing
1 x D5 pump
2 x Koolance QDCs(VL4)
it does have 4 x 90 degree angled adaptors.

Temps are good even at full load for long gaming session - CPU does not go above 50C and GPU max is 41C (room temp 22C)
Is there anything else I can try?

Shoggy

Sven - Admin

Thursday, November 1st 2012, 4:00pm

The correct value is 169 impulses per liter.

The flow rate sounds OK to me. Maybe it could be a bit higher but it is within a realistic range.

tpb211

Junior Member

Thursday, November 1st 2012, 4:12pm

Calibration impulses per liter should be set to 169 not 159. Hope this helps, Other ideas to increase flow would be to reduce or eliminate 90's [use45's if possible], consider adding a second d5 in a dual top if flow is still to low for your liking. This would also give you redundancy if one pump fails.

BorisTheSpider

Full Member

Sunday, November 11th 2012, 8:52pm

Quoted from "tpb211"

Calibration impulses per liter should be set to 169 not 159. Hope this helps, Other ideas to increase flow would be to reduce or eliminate 90's [use45's if possible], consider adding a second d5 in a dual top if flow is still to low for your liking. This would also give you redundancy if one pump fails.


I'm curious about this calibration number, because Martin tested and found that with 1/2" ID barbs and hoses, 158 was very close to a reference flow-meter: http://martinsliquidlab.org/2012/01/21/a…sensor-meter/6/

If I should be using 169 instead, I'd be interested to know why - it's not a big deal, and the difference in readings will be small, but I haven't seen anything to suggest that Martins testing wasn't accurate, so for now I'm sticking with 158.

mandrix

Full Member

Tuesday, November 13th 2012, 1:43pm

That seems like a pretty low flow number. I haven't hooked any D5's to a flow sensor though, I'm using a MCP35x.
I have all 7/16" ID tubing, guessing 4-5 foot
2xUT60 480mm rads in pedestal (hence the amount of tubing)
cpu block
2xgpu blocks
6x 45's & 3x90"s & 1x5 way "snake" (all rotaries except the drain line)
169 calibration setting for the high flow sensor

my max flow is around 1.2-1.3 gpm.
Just based on past experience with D5's I would think you would get more than 0.4gpm. But that is only a guess. Can you beg, borrow or steal another D5 and stick in the loop and see what 2xD5's does?

tpb211

Junior Member

Tuesday, November 13th 2012, 1:58pm

Hi Boris,
I recently read the same article and it made me think of this post as well. After reading martins post using 1/2" ID I would be inclined to use the 158 setting as well. I intend to run a similiar test on both of my loops and come up with a calibration value for my particular system. I will share the results when done. I am also using 1/2" ID tubing.

Avathar77

Newbie

Wednesday, November 14th 2012, 2:45am

Quoted from "mandrix"

That seems like a pretty low flow number. I haven't hooked any D5's to a flow sensor though, I'm using a MCP35x.
I have all 7/16" ID tubing, guessing 4-5 foot
2xUT60 480mm rads in pedestal (hence the amount of tubing)
cpu block
2xgpu blocks
6x 45's & 3x90"s & 1x5 way "snake" (all rotaries except the drain line)
169 calibration setting for the high flow sensor

my max flow is around 1.2-1.3 gpm.
Just based on past experience with D5's I would think you would get more than 0.4gpm. But that is only a guess. Can you beg, borrow or steal another D5 and stick in the loop and see what 2xD5's does?
From what I was told in other forums as well I should expect close to or even over 1GPM! :cursing:
I am going to swap the D5 to my DDC 18W and see how it does.
I don't have another D5 but I can always order one and see how it goes.

Jakusonfire

Full Member

Friday, November 16th 2012, 12:54pm

The problem is more than likely the QDC's ... they are by far the most restrictive part of your loop.

Personally I would do away with them because although they are convenient they are just too degrading to performance.

BorisTheSpider

Full Member

Saturday, November 17th 2012, 8:08pm

It suprises me that you'd say that since VL4s are at the very non-restrictive end of QDCs, and in general I don't think they are that bad - http://skinneelabs.com/quick-disconnect-roundup/ gives some numbers. I'm really quite suprised the OP has such low flow with a D5, but I can't see anything in the loop to cause it, so I guess either that's just the performance of a single D5 through a typical loop, or there is something wrong with the pump - OP, have you tried the DDC yet?

I think people worry too much about flow though, although 0.4 does seem low, the OP has great component temperatures so it goes to show you don't actually need a lot of flow.

markspend01

Unregistered

Friday, July 5th 2013, 9:06pm

Hey Boris well i think that the information which you provide about OP temperature is brilliant.Thanks!!

Grasshopper

Full Member

Saturday, July 6th 2013, 6:48am

Have similar flow from DDC pump (10W), with similar setup. Putting second DDC in series only increases it to 0.6gpm.

This post has been edited 1 times, last edit by "Grasshopper" (Jul 6th 2013, 6:51am)

cc01

Full Member

Sunday, July 7th 2013, 12:04pm

Does your D5 have a tacho output? If so could you check the speed of the pump? At 12V on setting 5 the speed is around 5500rpm if my memory serves me correctly.

This post has been edited 2 times, last edit by "cc01" (Jul 7th 2013, 12:12pm)

cpachris

Full Member

Sunday, July 7th 2013, 3:39pm

My D5's get up to 4,800 rpm on full speed.

mandrix

Full Member

Sunday, July 7th 2013, 4:27pm

Quoted from "cpachris"

My D5's get up to 4,800 rpm on full speed.
Yep, my pwm D5 is about the same.

Jakusonfire

Full Member

Monday, July 8th 2013, 12:06pm

With a single D5 pump running through a stopped D5, an EK supremacy, an FC 7970 GPU block, an Alphacool XT45 360 and ST30 240 with a bunch of 45's and 90's I'm getting 3.9 LPM

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