6SN1118-0DM33-0AA2
发布时间:2018-12-27 17:25:28点击率:
6SN1118-0DM33-0AA2
6SN1118-0DM33-0AA2
6SN1118-0DM33-0AA2
6SN1118-0DM33-0AA2
6SN1118-0DM33-0AA2
1.信号报警、联锁点的设置,动作设定值及调整范围必须符合生产工艺的要求。
2.在满足安全生产的前提下,应当尽量选择线路简单、元器件数量少的方案。
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3.信号报警、安全联锁设备应当安装在震动小、灰尘少、无腐蚀气体、无电磁干扰的场所。
4.信号报警、安全联锁系统可采用有触点的继电器线路,也可采用无触点式晶体管电路、DCS、PLC来构造信号报警、安全联锁系统。
5.信号报警、安全联锁系统中安装在现场的检出装置和执行器应当符合所在场所的防爆、防火要求。
6.信号报警系统供点要求与一般仪表供电等级相同。
安全完整性水平:
IEC-61508将过程安全所需要的安全度等级划分为4级(SIL1- SIL4,)。
ISA-S84.01根据系统不响应安全联锁要求的概率将安全度等级划分为3级(SIL1-SIL3)。
鉴于我国目前的实际情况,一般通过对所有事件发生的可能性与后果的严重程度及其他安全措施的有效性进行定性的评估,从而确定适当的安全度等级。
1级用于事故很少发生。如发生事故,对装置和产品有轻微的影响,不会立即造成环境污染和人员伤亡,经济损失不大;
2级用于事故偶尔发生。如发生事故,对装置和产品有较大影响,并有可能造成环境污染和人员伤亡,经济损失较大。
3级用于事故经常发生。如发生事故,对装置和产品将造成严重的影响,并造成严重的环境污染和人员伤亡,经济损失严重。
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