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current sensor

 
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aaaron(at)tvp.com.au
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PostPosted: Wed Mar 29, 2006 8:06 pm    Post subject: current sensor Reply with quote
I have a GRT EIS4000 and want to add the ammeter function. I forgot to
buy the sensor from GRT but I do have a spare hall effect sensor from
the previous Rocky Mountains EIS I was using. I'm wondering what the
voltage (I assume) output of these devices is? The RkyMtns one has three
input wires - is anyone familiar with these and how I might connect the
sensor to read volts into the GRT?

I've emailed GRT a couple of times but got no reply - I guess its
understandable that they want to sell me the $60 sensor rather than have
me use the one I have.

Thanks for your suggestions.
Allan

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klehman(at)albedo.net
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PostPosted: Thu Mar 30, 2006 5:21 am    Post subject: current sensor Reply with quote
Allan

The EIS sensor has a 5 volt input (they call it 4.8 volts for some
reason), a ground, and an output that outputs 0 to 5 volts. At zero
sensed current it output about 2.5 volts (half the supply voltage). At
max forward current it will output about 5 volts. At max reverse current
it will output about 0 volts. The EIS sense parameters (offset and scale
factor) can be adjusted to calibrate most sensors. Remember that you can
loop the sensed wire through the sensor more than once to increase the
sensitivity if you wish. My sensors all came from GRT but I have still
tweaked most of the sensor parameters a bit to calibrate them accurately.

Many industrial applications would feed a positive supply and a negative
supply to the sensor (instead of ground) so that the output at zero
sensed current is zero volts but that is not required with the EIS setup.

I don't recall anyone else mentioning the problem but I had to puzzle
out my own parameters to calibrate an extra liquid temp sensor as the
GRT numbers seemed to be way out of the ballpark for any kind of
accuracy. That was the only sensor that needed the reverse sensing
option selected on my install. I guess one should be hesitant to believe
any gauge until it is calibrated. I have found that support from GRT is
fast and excellant but if it were my business I'd probably also be
hesitant to spend time supporting products that I didn't sell. I am
assuming that they would be in favour of any discussion here though that
supports their product.

Ken

Allan Aaron wrote:

Quote:


I have a GRT EIS4000 and want to add the ammeter function. I forgot to
buy the sensor from GRT but I do have a spare hall effect sensor from
the previous Rocky Mountains EIS I was using. I'm wondering what the
voltage (I assume) output of these devices is? The RkyMtns one has three
input wires - is anyone familiar with these and how I might connect the
sensor to read volts into the GRT?

I've emailed GRT a couple of times but got no reply - I guess its
understandable that they want to sell me the $60 sensor rather than have
me use the one I have.

Thanks for your suggestions.
Allan




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