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Thread: 4-20ma controls

  1. #14
    Join Date
    Apr 2004
    Posts
    566
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    i use a johnson 350 series temp control for a 0-10,4-20 simulator. pulled it out of an old unit put 1000 ohm (i think) resistor across sensor terminals than turn dial and it ramps signal and has a bar style readout on front.cheap alternative to other simulators.

  2. #15
    Join Date
    May 2002
    Posts
    9,542
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    Originally posted by genman
    Originally posted by sysint
    It would be nice if the PLC people would allow a timer override on a jumped input to ignore the LP switch for a preset time.
    Most PLC programs have the ability to "force" and output.
    -I meant as their factory prescribed solution. Apparently Wolf has no interface to force this point.

  3. #16
    Join Date
    Aug 2002
    Posts
    6,047
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    Originally posted by genman
    Lift the 4-20 ma input to the system and put a 4-20 ma loop calibrator in and set it to a setting that will allow operaition of the unit. Just fool it with the calibrator.
    John
    A) do as above states

    B) physically remove transducer and attach to a tank of freon and plug the hole. Charge system, re-install transducer.


    I like "A" better though.

  4. #17
    Join Date
    Dec 2004
    Location
    Pa
    Posts
    10
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    Kele (www.kele.com)sales a signal generator that will generate either a 0-10Vdc or 0-20 mA signal. It cost about $ 100.00 well worth the money. Every comntrol tech should carry one especially if they are doing any tpye of comissioning or service.

  5. #18
    Join Date
    Jul 2004
    Posts
    34
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    Originally posted by mechdesigner4controls
    Kele (www.kele.com)sales a signal generator that will generate either a 0-10Vdc or 0-20 mA signal. It cost about $ 100.00 well worth the money. Every comntrol tech should carry one especially if they are doing any tpye of comissioning or service.
    Nice Tool thanks for the link...
    Direct link

  6. #19
    Join Date
    Jun 2003
    Location
    Reading, PA
    Posts
    43
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    JCI also makes a simulator. Its under $500.00
    I does 0-10VDC, 0-20 ma, & resistance.

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