Help with power for sous vide circulation pump

[doomblack]

Hi! I built a home sous vide setup for immersion bath cooking of meats in vacuum sealed bags. Built is a bit of an overstatement....I bought a roaster, a thermal probe, a temp controller, and relay and watched my friend wire it up. It works like a champ, BUT...there are cold/hot spots which is not good for exact temp cooking. I suppose that's why the professional models are called immersion CIRCULATORS. Soooo.....I got a submersible pump, good for high temps, and with some tubing that will solve my problem.
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The pump came without a power supply, so I am looking at all my discarded transformers so see what might spec out. The instructions for the pump power supply are:

Specification: Maximum voltage: 12V DC
Maximum current: 380mA
Maximum power:5W

That's what is written on the website where I got the pump. Based on that, I have a 5VDC 1A power supply that I figured would not work because of the 1A > 380mA. :-[
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However...the pump itself reads:

Input 2.5DC-12V 0.5-5W with no mention of current restrictions. ???

Do you think I can use the PS I have? If not, what's a good (common?) spec to look for? I have old unused power supplies from networking equipment, power tool chargers, toothbrushes, toys, etc. Something has to work!
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Thanks!

 

[Pommie]

Try it and see. Worst case it won't work. No danger of it burning out as it will only draw the current it needs.

Mike.

 

[KMoffett]

At 2.5V 0.5W/2.5V=200mA. At 12V 5W/12V=417mA. As long as you stay a little below 12v you should be fine.

Ken

 

[MaxHeadRoom78]

If it is a centrifugal impeller style pump, and you don't need the present maximum flow, you could throttle the outlet down some, and this will lower the pump current.
Max.

 

[crutschow]

As long as the 5V gives you sufficient water circulation, it will be fine.

The 1A supply rating is the maximum it can provide.
The pump will take only the current it needs.

 

[MaxHeadRoom78]

Do you think I can use the PS I have? If not, what's a good (common?) spec to look for? I have old unused power supplies from networking equipment, power tool chargers, toothbrushes, toys, etc. Something has to work!

Thanks!

All you need is a 12v secondary transformer and a diode bridge to run the motor.
Max.

 

[tomizett]

You might need to make sure the polarity (which wire is + and which is -) correct... otherwise the motor (if it's brushed) may run backwards, or (if it's an electronic brushless motor) you might even damage it.