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[Build Log] Merlin (Water Cooled r-atx SM8 w/dual Pedestals / Z97X-UD5H) - Page 94

post #931 of 2434
Thread Starter 
Since the subject of temperature sensors came up and my subsequent misidentification, I did a little research although I had problems finding very much information.

Here's what I believe to be true from what I've read, although don't take it as an absolute.
-The flat 10K ohm sensors we are talking about are technically Thermistors.
-The materials used in the tip end, or "sensing" end change resistance as temperature changes
-The length of the lead contributes to the overall resistance of the sensor
-The type of sensors we use are referenced on a 10,000 ohm resistance at 25c

So you could say that changing the length of the lead changes the overall resistance of the sensor. But, and this is a big but, copper wire has such low resistance that it's likely that changing the length of the sensor by a few feet would have negligible effect on the sensor's resistance.
In fact, one of the references I looked at talked about 18 gauge wire resistance per 1000 foot, which is surprisingly low.

What that means to me is that shortening or lengthening the sensor's lead for convenience in a computer case is not likely to cause any problems with accuracy.

Devices like the Aquaero have offset calibration, so if the sensor reading is "off" compared to some standard reference point, the calibration can be used to change the displayed sensor output.
Edited by mandrix - 3/25/13 at 4:28am
post #932 of 2434
Thanks for this and this is what I was thinking Merlin. But I needed to do the reasearch you did to double check before i said anything else. I am a Electrician/ Maintenance Supervisor/ Project Electrical Engineer by trade all just fancy titles for a electrician. But i thought this was the type of sensors that was being used. but also like you said you have the off sets and this is not calibrated so close that .001 of a degree really makes any differance if you do change the resistance. Not like I am use to working with where the sensors leads are 100's of feet long and calibrated to with in .001 of a degree so you have to watch what you are doing then. But glad to hear you had no problems with it and this is why i ask always better to listen to the voice of experiance than books.. great build.
post #933 of 2434
Thread Starter 
Happy to look it up. In my old age I think I remember something correctly, only to find out that what I remember isn't exactly right!
I took what was called "Industrial Electronics" I & II classes many years ago but a lot of this stuff wasn't covered.

So are you working with sensor systems that use amplifiers or whatever they are called to boost the signal over longer distances?
post #934 of 2434
Quote:
Originally Posted by mandrix View Post

Happy to look it up. In my old age I think I remember something correctly, only to find out that what I remember isn't exactly right!
I took what was called "Industrial Electronics" I & II classes many years ago but a lot of this stuff wasn't covered.

So are you working with sensor systems that use amplifiers or whatever they are called to boost the signal over longer distances?

Occasionally we will have these but since most of our equipment is bought OEM and they dont want use to have to do these calculations and want to make things simple for maintenance. what we will usally get is temp sensor and the cable with it already calibrated and usually way too long so we have to curl the cable up outside the unit that gets all the data and dose the calculations. I have tried to tell them that it is not that hard to do this with amps or doing the calculations our self but because of insurance and lawyers we are not allowed to do things like this.
post #935 of 2434
Hi Bern,

I have the Aquero 5 pro. only 4 screws holding the screen.thumb.gif
post #936 of 2434
Thread Starter 
Got the DVD painted, finally.


Here I'm wiring in my replacement pump for the dual MCP35x's.
First I cut the wires on one pump so they are pretty short, and strip the ends. Then I strip some insulation off a section of the longer power leads and wrap the wires together for soldering.


Here I've applied some 1/8" shrink over the soldered wires.You can see that if you are going to sleeve them, you must have the sleeve in place before you solder the wires together.
I used the same method to combine the pwm wire from both pumps.


Forgot to snap a shot on the workbench, but here it is temporarily installed until I resume pipe bending. The white sleeved leads are the rpm & pwm wire from the pumps that are connected to the fan header on the Aquero. Behind it you can see the blue sleeved power wire looping around to the side of the case. Incidentally I once again used a mini tamiya connector, since the pumps only need 12v.
post #937 of 2434
Thread Starter 
Quote:
Originally Posted by TATH View Post

Hi Bern,

I have the Aquero 5 pro. only 4 screws holding the screen.thumb.gif
Yep, only 4 screws. Seems to be enough, eh?
post #938 of 2434
Just got caught up nice job keep it up.

I agree with darlene though the one loop needs a second look. The other two you said you are probably going to go with loop much better.
post #939 of 2434
Nice work as usual I have learned so much and got so maney ideas from you... keep up the good work..
post #940 of 2434
Thread Starter 
Quote:
Originally Posted by freitz View Post

Just got caught up nice job keep it up.

I agree with darlene though the one loop needs a second look. The other two you said you are probably going to go with loop much better.
That was MOL a joke. I posted the final in post #925.
I had some new annealed tubing and wanted to see how easy it was to bend. tongue.gif

Back from your trip?
Quote:
Originally Posted by seross69 View Post

Nice work as usual I have learned so much and got so maney ideas from you... keep up the good work..
Thanks. Got to bend some 1/2" tubing for the res to pump line and the tubing will be through. Next I'll start working on making the gpu wiring a little better, I did a quick chop job when I moved the psu from the bottom to the top of the case.
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