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    UL certification requirement in USA for instruments

    We are coming up with a plant in USA which is a new territory for our operation. Does all instruments like transmitters, pressure switches, relays, valve electropneumatic positioners, etc., require UL certification for use in USA? Does control panels installed in safe area also require UL...
  2. S

    Difference between DVC6200 and DVC2000 positioner

    Can any one give the difference between Fisher valve positioners DVC6200 and DVC2000? Which is better?
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