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  1. jdaher

    designing to comply with UL 20 standard

    I'm working on the design of low voltage switchgear complying to UL 20 standard (Underwriters Laboratories). In clause 5.7.9 there is a test with incandescent lamps which seems to be demanding. Does anybody know any helpful hint on the selection of the contact material or shape of the contact to...
  2. jdaher

    Level measurement in oil

    I need to measure the level in a tank with hydrogenated vegetable oil. I have offers with different technologies, radar and ultrasonic. Which technology is more appropriate for this application? Jorge Fernández Daher
  3. jdaher

    MV motor with inverter

    We have a 2300 V, 60 Hz, 1250 HP, synchronous motor, working in a 50 Hz system. Is it possible to use an inverter to take it to 60 Hz? What possible MV inverter manufacturers do you suggest? Jorge Fernández Daher
  4. jdaher

    oxygen flow measurement

    In hospitals there are oxygen tanks where trucks regularly discharge liquid oxygen. The oxygen is then consumed as required. The oxygen flows out of the tank in gaseous phase. The administration of the hospital needs to control the amount of oxygen purchased. In the discharge there is no...
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