Current Transducer + Output Indicator

Thread Starter

koszowo

Joined Nov 2, 2010
4
Hi All
I have a LEM current transducer with 0-10V output
http://www.lem.com/docs/products/at_b10_e.pdf

I want to have a LED or lamp or anything that will indicate that there is any voltage on the output of the current transducer.
eg. 0 V - indicator off
1V up to 10V - indicator on

Is there any LED or lamp that will work on 0-10 V ?

Thank for help
 

t_n_k

Joined Mar 6, 2009
5,455
The device appears to be a voltage only (limited current) output type.

It may not be capable of delivering sufficient current to directly drive an LED.

You would (for instance) be able to buffer the transducer output with a high impedance op-amp circuit which could subsequently drive an LED. But that would require an auxiliary DC supply to power the buffer circuit.
 

t_n_k

Joined Mar 6, 2009
5,455
Perhaps it would help if you gave a more detailed listing of your requirements including

  1. Required primary current range.
  2. Do you only want to detect the presence of primary current or do you also want to measure the actual primary current value?
  3. Whether or not you are limited to using a self-powered transducer.
  4. Would you consider using a secondary side powered transducer?
  5. Whether you have sufficient skill to build any additional interface electronics.
  6. Are you on a very limited budget?
 
Last edited:

Thread Starter

koszowo

Joined Nov 2, 2010
4
Thanks for answer. Please find my answers below.

Required primary current range.
Primary current range 0-5 A

Do you only want to detect the presence of primary current or do you also
want to measure the actual primary current value?
I want only to detect the presence of primary current.

Whether or not you are limited to using a self-powered transducer.
Self-powered transducers are preferable.

Would you consider using a secondary side powered transducer?
It could be an option.

Whether you have sufficient skill to build any additional interface electronics.
Skills are probably not sifficient but I want to try.

Are you on a very limited budget?
not very limited but limited.

I hope this helps
 

wayneh

Joined Sep 9, 2010
16,398
I wonder if you couldn't just light an LED directly with a device mounted right NEXT to the transducer? At that current range, I think a few loops of wire - an in situ transformer - might give enough juice to power an LED, which could probably be protected against over-current with a zener or other current limiting trick. Downside is the need to loop around the main conductor.
 
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