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The article discusses the importance of safety in the instrumentation of process plants. It emphasizes that simply using sensors with SIL certification is not enough to ensure safety and that systematic errors during planning, installation, and operation can lead to safety problems. The article provides examples of how systematic errors can affect temperature, flow, and level measurements, and offers suggestions for avoiding mistakes during installation and selecting the right measuring devices. It also discusses the importance of automated testing and partial proof tests in ensuring safety. Overall, the article highlights the need for careful planning and operation to ensure the safety of process plants. [Extracted from the article]