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post #5971 of 11219
Quote:
Originally Posted by Costas View Post

It is important that the sensor is zeroed every so often otherwise the whole calibration curve will shift up or down by the amount the zero value drifts.

It will drift even due to temp changes.

You can do it manually or let the Aquaero fo the zeroing for you automatically.

In the setup for the MPS curves you will see a tick box which enables auto zeroing of the sensor. Make sure this box is ticked.

Once enabled the Aquaero will automatically set the zero point when the unit itself is powered up but with the pumps not running. So when the pc is sitting there switched off and the Aquaero still has power going to it - it will automatically rezero the MPS sensor in this state.

OK, I disconnected the pump and clicked on "set current flow as zero". It flashed green for a while, and then when I reconnected the pump, set at 50%, the unscaled value went to 42, so I guess it did move the curve, BTW, I'm still using fast_fate's curve. OTOH, at 100%, it still reports only 0.9 gpm. Here's my page from Aquasuite:



Also, here is a picture of the system, where you can see the loop and fittings:

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post #5972 of 11219
Ok I think I see your problem...

Its where you have mounted the MPS400. It really needs approx. 50mm or more of straight line tubing before and after the sensor.

It is not recommended to have bends near the sensor as it can/will upset the supplied calibration values substantially.

Also fast_fate and myself found that mounting it directly adjacent the inlet side of a pump affects the calibration with varying flow rates. Better placing it on the output side if possible.
Edited by Costas - 11/5/15 at 8:26pm
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post #5973 of 11219
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post #5974 of 11219
No you would need to wire the power switch to the relay ( com/n.o. ) then program the aq to close the relay when you want to
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post #5975 of 11219
Quote:
Originally Posted by Costas View Post

Ok I think I see your problem...

Its where you have mounted the MPS400. It really needs approx. 50mm or more of straight line tubing before and after the sensor.

It is not recommended to have bends near the sensor as it can/will upset the supplied calibration values substantially.

Also fast_fate and myself found that mounting it directly adjacent the inlet side of a pump affects the calibration with varying flow rates. Better placing it on the output side if possible.

Thank you! +1
I read that thread a couple of times, and still missed the tip to mount it on the outlet side of the pump. I did read in the manual that it shouldn't be placed near bends, but I couldn't find a location in the loop that met that requirement without looking terrible, so I decided to compromise. Of course, when I turned the system on, I totally forgot about this. I guess I will have to live without a reliable flow rate indication, but at least I can rest easy about having to find and fix mysterious restrictions.
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post #5976 of 11219
Quote:
Originally Posted by jeanspaulo View Post

Another thing is that even after I go to aquasuite System options and Time Settings and click on the Synchronize Time when I did it the clock and calendar change to equal the SO but after a few minutes it changes back to randon again just by itself.
As soon as the time and date is correct you should disconnect the USB cable so you can check if the random values will be caused that way or if it is something that the aquaero does itself. No solution so far but one step forward to tell where the problem might have its root.
post #5977 of 11219
Quote:
Originally Posted by jvillaveces View Post

Thank you! +1
I read that thread a couple of times, and still missed the tip to mount it on the outlet side of the pump. I did read in the manual that it shouldn't be placed near bends, but I couldn't find a location in the loop that met that requirement without looking terrible, so I decided to compromise. Of course, when I turned the system on, I totally forgot about this. I guess I will have to live without a reliable flow rate indication, but at least I can rest easy about having to find and fix mysterious restrictions.

That pic is a bit hard to decipher as to how the meter is actually connected to the loop and its proximity to the pump but it absolutely could be a factor. The other thing I can see is in that Bitspower res it looks like you have an anti vortex fitting? Those things can be very restrictive.

The low unscaled values at 50% does seem to indicate a calibration or measurement problem
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post #5978 of 11219
Quote:
Originally Posted by Costas View Post

Its where you have mounted the MPS400. It really needs approx. 50mm or more of straight line tubing before and after the sensor.

It is not recommended to have bends near the sensor as it can/will upset the supplied calibration values substantially.

I am looking at building a water cooled system (CPU block, 1 x GPU block, 2 x 360 rads - overkill from cooling but tons of upside) that will include a aquaero 5 or 6. The flow meeting I am looking at is the 'Aquacomputer Flow Sensor 'High Flow' G1/4 for Aquaero 5/6 , Aquastream XT Ultra and Poweradjust'. Initial plans are to put two in the system, one just after the pump and one just before the reservoir. Your comment re '50mm of straight line tubing before and after' has thrown my initial plans (re the flow sensor after the pump) in the trash.

So ... questions ...

  1. Do I need two flow meetings? Won't the liquid all be travelling at roughly the same speed in the loop?
  2. The way I see it, I really only have two locations with 140mm of straight run ... a) back into the res, b) out of the rad into the CPU block ... any preference re location from those two?
  3. I could 'create' a longer run by taking my tube from the pump to the rad on a detour ... is that worth while or just adding unnessary loop length?
post #5979 of 11219
Quote:
Originally Posted by ruffhi View Post

Do I need two flow meetings? Won't the liquid all be travelling at roughly the same speed in the loop?

Only one flow meter is required. As you state the flow is the same around the loop - only the pressure varies as the fluid traverses through different items.

Note that the MPS400 device measures differential pressure across its internal port whereas the 'Hi-Flow' sensor operates differently in that it has a rotating impeller which the fluid pushes around. The impeller has two magnets on it which are sensed via a Hall Effect device and this device sends out pulses to the Aquaero. The velocity of the fluid then determines the speed of the impeller which gives you the flow.

So the Hi-Flow sensor is not affected by pressure as much as compared to the MPS400.

When we place angle fittings etc near a sensor it introduces a large pressure change (as compared to a straight fitting). The pressure value changes as the flow changes thereby causing all sorts of non linearity issues which plays havoc with calibration values.

Another thing that affects these sensors is how laminar the fluid flow is. Having angle fittings and/or bends close to the sensor results in the fluid flow being turbulent which can affect the readings. This really affects the MPS400 sensor way more than the Hi-Flow simply due to the fact that the MPS400 relies on accurate pressure values to determine flow whereas the Hi-Flow does not.

Small air bubbles will also affect the MPS400 but not so much the Hi-Flow sensor.

With the Hi-Flow, just ensure that you don't fit say a right angle fitting to its body if you can. Preferably you want straight fittings and a short length of straight tubing before and after the inlet/output fittings if you can. This will then achieve the best linearity with the sensor and its fixed calibration value.
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Déjà vu
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I7-6700K ASUS Maximus VIII Formula EVGA 980Ti Classified EVGA 980Ti Classified 
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Corsair CMD32GX4M4B3200C16 Samsung 512GB 950 Pro M2 Samsung 1TB 850 Pro Custom 
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post #5980 of 11219
Thx Costas ... some good stuff to think about.
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