Connect with us

Current sensing?

Discussion in 'Hobby Electronics' started by Poxy, Apr 7, 2006.

Scroll to continue with content
  1. Poxy

    Poxy Guest

    I need to sense the operation of a couple of pumps in the 1 to 2kW range.
    Measuring the actual current would be nice, but just knowing they're
    operating would be enough. I'd rather not use shunts - I think there's
    enough current to be able to see what's going on by attaching something
    around the active to each pump - anyone have any ideas?
     
  2. Dan H

    Dan H Guest

    A current transformer is one common way of doing this. Split core units
    are available that do not require the moving the wire being monitored.

    Dan
     
  3. current clamp?
     
  4. Dan H

    Dan H Guest

    See http://www.split-core.com/ for an example of current transformer to
    do what you want.

    Dan
     


  5. I am aware you said that you would rather not use shunts,
    but it would cost you very little money and effort to try out
    these current sensors. Just a thought.

    http://www.allegromicro.com/sf/0750/


    *** Free account sponsored by SecureIX.com ***
    *** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com ***
     
  6. Mike

    Mike Guest

    Is this for permanent installation or just a one-off have a look see if
    any current being consumed ?

    If the former then hall effect sensors work real well, if the latter
    then borrow a clamp meter, you can buy a cheap one for around $60 or
    get an add on one for a normal DMM for around $25 or so...

    btw: What sort of pump ?

    Because if induction motor then current consumption wont guarantee
    the rotor is turning, so although you might see something then its
    not a given its actually spinning.

    If it was me, I'd use a current clamp with a reasonable frequency
    response and interface these to a CRO, will see some nice spikies
    if its an induction motor and the rotor is actually turning.

    Do I take it these are submerged bore pumps and some distance below
    ground and you cant hear them running and there is no water flow
    because you are investigating if the bore has dried out ?


    --
    Regards
    Mike
    * GMC/VL Commodore, Calais VL Turbo FuseRail that wont warp or melt !
    * High grade milspec ignition driver electronics now in development
    * Twin Tyres to suit most sedans, trikes and motorcycle sidecars
    http://niche.iinet.net.au
     
  7. Poxy

    Poxy Guest

     
  8. Poxy

    Poxy Guest

    Actually they look like a neat solution - I'll check it out. Thanks John.
     
  9. David Sauer

    David Sauer Guest

    Current sense relay ?

    The better ones have under and over current sensing which can be used
    to indicate a fault with the motor. I've seen them used for A/C
    control boards for monitoring air-con motors. Much more reliable than
    an air-pressure switch.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-