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live current monitoring/logging

 
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stevieturbo



Joined: 29 Aug 2006
Posts: 1235
Location: Norn Iron

PostPosted: Sun Oct 27, 2013 7:29 am    Post subject: live current monitoring/logging Reply with quote

Any reason this sort of sensor couldnt be used ?

http://uk.farnell.com/lem/hais-50-tp/current-transducer/dp/1617434

Seems to be 5v powered, and outputs 0-5v based on current. It's a pass the cable thru the CT type of device, although the image shows it with a hard wired section to carry the current through it.

Handy for monitoring fuel pump current when using multiple pumps to highlight a potential problem ? Or logging other devices where their performance matters

Or anyone used anything similar or better, more suitable ?
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plex



Joined: 25 Jun 2006
Posts: 58

PostPosted: Sun Oct 27, 2013 5:28 pm    Post subject: Reply with quote

Yes it could work but it will not be very useful as the measuring range is too large for your application.
With 0 current the output is at 2.5Volts.
Output = 2.5V+(0.625 * Current / 50)
With 10Amps it will be at 2.625Volts.
Have to look for something similar but with a smaller range.
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stevieturbo



Joined: 29 Aug 2006
Posts: 1235
Location: Norn Iron

PostPosted: Sun Oct 27, 2013 5:52 pm    Post subject: Reply with quote

plex wrote:
Yes it could work but it will not be very useful as the measuring range is too large for your application.
With 0 current the output is at 2.5Volts.
Output = 2.5V+(0.625 * Current / 50)
With 10Amps it will be at 2.625Volts.
Have to look for something similar but with a smaller range.


There are others, but those are only ones I found to work off a 5v supply. The rest were either 8v or 12v regulated it seems.

ie.

http://www.scienceshareware.com/how-to-measure-AC-DC-current-with-a-hall-effect-clamp-.htm
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baldur



Joined: 12 Oct 2007
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Location: Reykjavik, Iceland

PostPosted: Mon Oct 28, 2013 4:00 am    Post subject: Reply with quote

Allegro power electronics also make miniature hall effect sensors in the form of integrated circuits, great for power distribution boxes.
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Warpspeed



Joined: 05 Jun 2006
Posts: 549
Location: Melbourne

PostPosted: Mon Oct 28, 2013 3:17 pm    Post subject: Reply with quote

Those Hall effect sensors are ideal for measuring isolated ac and dc currents for data logging purposes.

Typically the specified current ranges are always quite high, but the range is listed with the measured current passing only once through the central hole.

You can increase the sensitivity any amount by looping the current carrying wire through the hole several times. This multiplies the "ampere turns" and the sensor can then be made as sensitive as you wish to make it.
If you look at the data sheet, you will see a picture of this sensor with the fat copper link passing through the hole for soldering direct to a circuit board.
This link is readily removed leaving an open rectangular hole through the middle through which you can then loop multiple turns of wire. There is also a picture with the open hole.

If one pass through the hole produces rated full output at 100 amps, four turns will give the same output voltage at 25 amps. Or ten turns the same full output voltage at 10 amps.

As you measure lower current ranges with greater sensitivity, the wire carrying the current can be made thinner, so there should always be enough room through the hole to wind sufficient turns to do the job.

It would be entirely practical to drive a 100 Amp sensor to full output with only 1 Amp by looping 100 turns of fine wire around the sensor and through the rectangular hole.
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David Ferguson



Joined: 21 Aug 2006
Posts: 59
Location: Paso Robles, CA

PostPosted: Tue Oct 29, 2013 6:00 am    Post subject: Reply with quote

Here's another 5V part available that will give good resolution for 6 - 75 amp depending upon part & how you wire the current pins.

http://www.mouser.com/ProductDetail/Tamura/S22P025S05/?qs=sGAEpiMZZMvhQj7WZhFIADVfG8I25CmEsAURsS8wHac%3d

I think I'll make up a module to allow measuring current for things like Lambda heaters, coil packs, fuel pumps and fans.

Thanks for the idea!
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stevieturbo



Joined: 29 Aug 2006
Posts: 1235
Location: Norn Iron

PostPosted: Tue Oct 29, 2013 6:14 am    Post subject: Reply with quote

David Ferguson wrote:
Here's another 5V part available that will give good resolution for 6 - 75 amp depending upon part & how you wire the current pins.

http://www.mouser.com/ProductDetail/Tamura/S22P025S05/?qs=sGAEpiMZZMvhQj7WZhFIADVfG8I25CmEsAURsS8wHac%3d

I think I'll make up a module to allow measuring current for things like Lambda heaters, coil packs, fuel pumps and fans.

Thanks for the idea!


It was primarily fuel pumps I was interested in, but coils would be another. But coils would require a fast logging rate to get a good picture.

Electric water pump or steering might be another to keep check of ? If you had those.

Or maybe even stick one on the alternator, to keep check of how much current the electrical system on the car is actually using at any time.
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