Class B: It represents the most basic level of technical assurance. Without the use of any safety technology, any failure may lead to the complete loss of safety functions, and it is not considered a truly safe product.
Class 1: It begins to employ certain guaranteed safety devices and technologies to ensure the safety performance of the product. Compared to Class B, the possibility of the loss of safety functions in Class 1 is significantly reduced, yet it still belongs to a single-loop system without self-testing.
Class 2: It introduces periodic self-testing to fulfill safety requirements. This means that despite a fault possibly causing the temporary loss of safety functions, it will be automatically detected in the subsequent work cycle. Consequently, Class 2 pertains to a single-loop system with periodic self-testing.
Class 3: It demands the utilization of guaranteed safety devices and technologies. Similar to Class 2, a failure will not lead to the complete loss of safety functions. However, the accumulation of faults may eventually result in the loss of safety functions. Nevertheless, the Class 3 system remains a double-loop system without self-testing.
Class 4: It represents the highest level of safety. This level also utilizes guaranteed safety devices and technologies to ensure that even in the event of a failure, the loss of safety functions will be avoided. Additionally, the Class 4 system is equipped with real-time self-testing functionality to guarantee the continuous effectiveness of the double-loop system. This design concept aims to provide the operators with the highest level of safety protection.
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