Knick loop-powered isolators for 0 (4) ... 20 mA signal transmission. They are available as isolators with intrinsically safe input or output. Due to their patented design (German patent 3526997), they are considered to be the most reliable solution for isolating standard signals without external power supply.
The IsoTrans® 36 and 37 isolators are not only suitable as highly reliable isolators for normal applications, they also meet the most extreme requirements that can be set for signal isolation. There is no need to wire a power supply.