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Opinion: Fan Controller Temp Sensor Placement

post #1 of 7
Thread Starter 
Okay, assuming a single loop with CPU block and two GPU blocks. A fan controller (Lamptron Touch if that matters) and 3x 120.4 rads in push/pull. (or maybe 4x 120.4 rads, we'll see)

Where would you place your sensors to keep fans at as low a speed as possible when not under load?
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post #2 of 7
I put my temperature probes on the side of my radiators and pretty much use target temperatures with slow ramp times. That's with a T-Balancer...not familiar with how your Lamptron works.
Edited by kidsafe - 4/24/12 at 8:06pm
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post #3 of 7
Apologies for resurrecting a semi old thread, but this seemed in line with a question I have myself.

I'm adding a similar fan controller to my loop (FC5v2) in the next couple days in addition to replacing/adding rad fans and replacing all my tubing. The controller comes with 4 temp sensors and I'm curious about how to actually use them. I don't need CPU or GPU temps from it as I get those in Windows already. I suppose I could get ambient temps at the intake and/or exhaust fans for curiosity's sake. The one thing that does intrigue me is water temp, but I can't find any mention of how people actually place the physical probe. Obviously I don't want to put a hole in the tubing (right?) and taping the thing to the outside of the rad or reservoir isn't going to be very accurate I wouldn't think. Do I just find a way to snake it into the reservoir somehow or do I need extra hardware?
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post #4 of 7
I am very close to getting a similar controller so wondered the same. The first one or two would definitely be on the PCB or near heatsinks of the controller itself. That is particularly true if you are overloading any channel by piggy-backing multiple fans. Make sure the PCB stays cool. Use a case fan zip-tied in or some way to cool your controller to prolong its life.

When I tested water temperature with a laser-guided infra-red thermometer, I found the water temp (removing a top plug of the res and shooting directly at the water many times to lessen reflective error) to be the same as the outside of the reservoir or tubing. So I think your idea to attach a probe or two there makes sense. Add a cheap digital room thermometer for ambient in C° or F° and that may get you started. Good luck. smile.gif
    
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post #5 of 7
That's surprising about the reservoir and tubing, but I suppose considering how thermodynamics work it makes sense. I have an atomic clock on my wall that also gives ambient temp so I'm covered there.

About measuring the temp of the controller itself...it's really going to get that warm? I'm only running 2 fans per channel and even combined they should be well below the 30W threshold.

I appreciate the advice, just waiting for new thermal compound to arrive and I can start my project probably in a couple days now.
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post #6 of 7
I have the same fan controller (lamptron fc5v2) and I use these for water temps:

tempsensors.jpg

My build has all red fittings (pre-monsoon) so the above were part of my special order direct from Bitspower in Taiwan, not a recommended purchasing method if you are in a hurry rolleyes.gif

Check the usual online watercooling shops, they should be readily available in the more standard matte black or silver finish. I'm pretty sure at least one or two other fittings manufacturers make water temp sensors as well.

But basically, the picture shows the idea... a stop plug with a temp sensor built in.
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by musicfan View Post

I am very close to getting a similar controller so wondered the same. The first one or two would definitely be on the PCB or near heatsinks of the controller itself. That is particularly true if you are overloading any channel by piggy-backing multiple fans. Make sure the PCB stays cool.

The Lamptron line doesn't use undervolting to control the fans. Undervolting is what causes the huge amount of heat generated by other fan controllers. Lamptrons use power modulation to slow down the fans and that produces virtually no heat at all.
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Dark Vader
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