current sensor

[drewcrew6]

I need a little help locating a CURRENT TRANSFORMER or CURRENT TRANSDUCER with a hole of about 7/8 or larger but I need like a 0-1 amp range preferably 4-20ma out but voltage would be fine.

Anyone have any ideas?

We are currently using a 0-5amp model from simpson and it just does not give us the resolution that we need for a dependible machine.


Thanks
Drewcrew6

 

[keithkyll]

Can you put the wire through the Simson unit twice (1 loop)?
That should double the output and improve resolution. You'll need to recalibrate after. I don't think it will be exactly double.

 

[drewcrew6]

The looping has already been done .

Actually 15 loops but the current we need to read is in the microamp range. The voltage is extremly high which is why we want the isolation of a CT.

Thanks
Drewcrew6

 

[rdrast]

How about this one:
http://www.bergoz.com/ipct/d-ipct.htm

Range is as low as 1ma, resolution is 10 microamps.

 

[Tom Jenkins]

Try these guys:

http://www.veris.com/

http://www.nktechnologies.com/

 

[drewcrew6]

I finally found what I need.

0-.5 amp with 0-5vdc OR 4-20ma output

http://www.crmagnetics.com/newprod/ProductView.asp?ProdName=CR4110

Plus they are in the USA.

Thanks for the suggestions!

Drewcrew6

 

[keithkyll]

You mentioned 'extremely high' voltage. I assume your are using AC.
Is 2500VDC (peak AC) enough isolation?

 

[castlerock]

Thats pretty cool stuff guys. Whats the lowest price you've seen for such a device? I'd really like to have one. =]

 

[drewcrew6]

The power supply is capable of 3000vdc but it is pulsed at 60hz.
the test specs range from 1000-1500volts.

Looks like they go for around $200 US.

Drewcrew6

 

[TConnolly]

www.ohiosemitronics.com

 

[Sheldn]

http://www.flex-core.com/

Ohio Semitronics is good also. Both have products that should meet the application.

 

[curlyandshemp]

This may not apply for your current application, but for future consider using a devicenet E3-Solid state overload relay

http://literature.rockwellautomation.com/idc/groups/literature/documents/br/pcp-br001_-en-p.pdf

with that you can access current on all three phases, average current etc.

Ian Phillips