Spurious trip level (STL) is defined as a discrete level for specifying the spurious trip requirements of safety functions to be allocated to safety systems. An STL of 1 means that this safety function has the highest level of spurious trips. The higher the STL level the lower the number of spurious trips caused by the safety system. There is no limit to the number of spurious trip levels.
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| - Spurious trip level (en)
- 誤動作等級 (zh)
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| - 誤動作等级（STL）是對於架設在安全系統（安全相關系統或安全關鍵系統）中的安全機能，對誤動作次數的要求。STL 1表示安全機能會出現的誤動作次數最多，誤動作等级最高，表示會出現的誤動作最少。誤動作等级沒有上限的限制。 安全系統及安全機能是為了保護人員設備安全，及避免影響環境所設置，安全機能應該是在出現危險情形時才能啟動。但若安全機能在沒有危險情形時動作（例如因內部故障而動作），可能不會造成人員設備的危害，但會可能使設備的原始機能無法運作（例如因安全機能誤動作，電梯會停在最近樓層，無法正常起降），因此會帶來經濟上的損失。誤動作等级就是表示安全機能出現誤動作的機率。 STL（誤動作等级）是一種安全機能的性能水平度量，度量其誤動作的頻繁程度。依IEC 61508、、ISA S84及EN 50204等安全標準中有提到一些會因為STL而獲益的典型系性。誤動作等级可以讓使用安全機能的終端客戶有可以量化的指標，有助於客戶訂定期望的安全機能可用性水準。誤動作等级可以針對整個安全迴路訂定，也可以只針對個別的元件。 終端客戶常會陷入一個二難的處境，一方面需要安全機能來保護人員、設備及環境，但又不希望因為安全機能的誤動作影響正常製程，因而造成經濟上的損失。誤動作等级可以說明安全機能誤動作的機率，有助於讓終端客戶達到理想的安全性及理想的製程可用度。 (zh)
- Spurious trip level (STL) is defined as a discrete level for specifying the spurious trip requirements of safety functions to be allocated to safety systems. An STL of 1 means that this safety function has the highest level of spurious trips. The higher the STL level the lower the number of spurious trips caused by the safety system. There is no limit to the number of spurious trip levels. (en)
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| - Spurious trip level (STL) is defined as a discrete level for specifying the spurious trip requirements of safety functions to be allocated to safety systems. An STL of 1 means that this safety function has the highest level of spurious trips. The higher the STL level the lower the number of spurious trips caused by the safety system. There is no limit to the number of spurious trip levels. Safety functions and systems are installed to protect people, the environment and for asset protection. A safety function should only activate when a dangerous situation occurs. A safety function that activates without the presence of a dangerous situation (e.g., due to an internal failure) causes economic loss. The spurious trip level concept represents the probability that safety function causes a spurious (unscheduled) trip. The STL is a metric that is used to specify the performance level of a safety function in terms of the spurious trips it potentially causes. Typical safety systems that benefit from an STL level are defined in standards like IEC 61508 IEC 61511, IEC 62061, ISA S84, EN 50204 and so on. An STL provides end-users of safety functions with a measurable attribute that helps them define the desired availability of their safety functions. An STL can be specified for a complete safety loop or for individual devices. For end-users there is always a potential conflict between the cost of safety solutions and the loss of profitability caused by spurious trips of these safety solutions. The STL concept helps the end-users to end this conflict in a way that safety solutions provide both the desired safety and the desired process availability. (en)
- 誤動作等级（STL）是對於架設在安全系統（安全相關系統或安全關鍵系統）中的安全機能，對誤動作次數的要求。STL 1表示安全機能會出現的誤動作次數最多，誤動作等级最高，表示會出現的誤動作最少。誤動作等级沒有上限的限制。 安全系統及安全機能是為了保護人員設備安全，及避免影響環境所設置，安全機能應該是在出現危險情形時才能啟動。但若安全機能在沒有危險情形時動作（例如因內部故障而動作），可能不會造成人員設備的危害，但會可能使設備的原始機能無法運作（例如因安全機能誤動作，電梯會停在最近樓層，無法正常起降），因此會帶來經濟上的損失。誤動作等级就是表示安全機能出現誤動作的機率。 STL（誤動作等级）是一種安全機能的性能水平度量，度量其誤動作的頻繁程度。依IEC 61508、、ISA S84及EN 50204等安全標準中有提到一些會因為STL而獲益的典型系性。誤動作等级可以讓使用安全機能的終端客戶有可以量化的指標，有助於客戶訂定期望的安全機能可用性水準。誤動作等级可以針對整個安全迴路訂定，也可以只針對個別的元件。 終端客戶常會陷入一個二難的處境，一方面需要安全機能來保護人員、設備及環境，但又不希望因為安全機能的誤動作影響正常製程，因而造成經濟上的損失。誤動作等级可以說明安全機能誤動作的機率，有助於讓終端客戶達到理想的安全性及理想的製程可用度。 (zh)
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