 | | the task guaranteeing reliable and safe system operation requires galvanic isolation between the sensor and controller (for example dcs, plc, etc.). a low-cost solution is provided by loop-powered isolators for standard signals because they do not require power supply units and wiring. the problems are often, particularly in large plants, the lack of space for mounting the isolators and the increasing operating temperatures in distributors and enclosures. despite cost pressure a sufficient galvanic isolation shall be guaranteed. the solution that accounts for effectiveness as well as efficiency is found in the 6 mm class from knick: the isotrans® a 20400 loop-powered isolator offers one or two channels in a 6 mm housing. an extremely high component density of 320 channels per meter of top hat rail and excellent technical properties, for example, safe isolation or elimination of feedback through a load-stop function, make the isolators unbeatable. the cost/performance ratio is excellent. the housing the new modern modular housing with a width of only 6 mm for 1 or 2 channels allows simple and quick assembly due to its sophisticated geometry. the function principle the isotrans® a 20400 obtains its power directly from the measuring signal as a voltage dr-op without falsifying it. there are no costs for a power supply and wiring. the isotrans® a 20400 more or less has no self-heating that would cause the electronic components to age faster. together with a patented circuit technology, this means maximum reliability. due to this long service life, we give a 5-year warranty. the technology a transmission error of just 0.1 %, excellent square-wave response and very low residual ripple guarantee perfect signal transmission. the low intrinsic voltage dr-op of approx. 1.7 v presents just a slight signal load. the high test voltage up to 2.5 kv and safe isolation in accordance with en 61140 up to 300 v protect operating personnel against the mains voltage, for example. interference-free functionality now knick has considerably expanded the application possibilities of passive isolators by implementing a bürdenstop® (load stop) function. here, the current supplied at the primary side is maintained independently from the output load. thus, for the first time any excessive load increase at the output, such as caused by line breakage or inconstant loads including complex impedances, can be compensated for. |
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