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120v Current Sensor?


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#1 iced98lx

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Posted 27 May 2013 - 10:17 PM

Part of my project is going to involve measure just how much current is being used to power the tank itself, as well checking a few other circuits (of yet unkown voltage) to see if they're in use. I'm eyeing this piece:

http://www.crmagneti...PDFs/CR3100.pdf

 

I'm assuming a few hooked to the Analog in's of my N+2 could measure current, yea? Issue is I'm looking to measure as little as a few hundred milliamps and at most 20 amps, not sure the 75amp ones will have the resolution I'm looking for.

 

Anyone done this?



#2 cutlass

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Posted 27 May 2013 - 11:29 PM

I'm glad that you're using inductive current measurement!

 

IMHO, the datasheet you linked to looks similar to the cruddy datasheets that I see for ~90% of the arduino shields. :)

 

 

EDIT:  Seems like the Pulse Electronics sidewinder series need a special sensor or SOC that supports it.

So, they won't work without additional support circuitry.  Off hand, I don't know of another current sensor with good accuracy and linearity over the range that you need.

 

I've used the ones by Pulse Electronics before.  They work, they have real specs, and they have real data sheets. :)

Even at the low end of their measurement range (0.1amps) they have an error of less than 1%.  By ~10% of full scale, the error goes down to ~0.05%.

The PA3206 or PA3208 would be a good choice.  You don't want a "huge opening" for the sensor and a small wire.

 

PA3206NL 460?V/A460 0.1A–>40 A
PA3208NL 460?V/A460  0.1A–>120 A

 

Some links:

http://www.pulseelec....com/sidewinder

 

http://www.pulseelec...nload/3775/g043

 

http://productfinder...sheets/P698.pdf

 

http://www.st.com/st.../CD00289924.pdf

 

PA3206

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PA3208

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Good Luck!






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