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四、SIS 的安全等级：SIL（安全完整性等级） SIS 的可靠性通过 SIL（Safety Integrity Level，安全完整性等级） 划分，分为 SIL 1 至 SIL 4 四个等级（SIL 4 最高）。等级越高，系统的安全性能越强，发生故障的概率越低。 SIL 等级由 “风险分析” 确定：根据生产过程的危险程度（如介质毒性、爆炸风险. SIS 是Safety instrumented system的简称，中文意思是安全仪表系统， 它包括安全联锁系统、紧急停车系统 有毒有害、可燃气体及火灾检测保护系统 等，广泛应用于石油、化工等流程工业中。 安全仪表系统SIS, 用于监视生产装置或独立单元的操作，当生产正常时，SIS处于休眠或静止状态。一旦生产装置或. 知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容，聚集了中文互联网科技、商业、影视. SIS网站是否被卸载，引发网友讨论和寻找新的替代平台。
Got the bad new today denied on ccw permit it showed my felony conviction,but it was a sis, i dont have a conviction on my record ,but fbi can open sis and sealed records I purchases a firearm and past a ncic check with flying colors Why cant i get a ccw permit in missouri ?? 依据 1.国家安全监管总局关于加强化工安全仪表系统管理的指导意见安监总管三〔2014〕116号 ：（一）化工安全仪表系统（SIS）包括安全联锁系统、紧急停车系统和有毒有害、可燃气体及火灾检测保护系统等。
SIS系统（安全仪表系统），是一个整体的概念，指的是由 满足一定安全规范标准 的现场仪表、 逻辑控制器 、执行机构等构成的的，用于现场生产安全的控制系统。 区别于一般 生产控制系统 （DCS、PLC），SIS系统旨在现场工况出现危害生产安全条件时，触发连锁逻辑进行适当的保护动作，如部分.
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