Plant safety in the chemical and petrochemical industries must satisfy high demands – reliability and availability are crucial factors for continuous production processes. Signal interfaces are at far greater risk of surge voltages than power supply systems. This is a result of the numerous cables laid in parallel and the more sensitive input and output interfaces. Based on the risk potential and safety level required for the interface, a variety of surge protective devices are used. These are installed directly before the signal inputs to be protected. The circuits of these protective devices are adapted to the relevant signal types.
Have you thought of what would have happened in the event when any existing non-pluggable surge protective devices (SPDs) are overloaded without any sign of status indication? Continue reading