详细介绍
DS3800NBIC1H1E
1.2.2 结构可靠和HART信息
1)结构经久耐用:全密封结构阻止了震动、温度和腐蚀性环境对它的影响,独立的防风雨现场接线盒把现场导线接点和仪表其他部分隔离开。
2)加快开工预备步骤:数字式阀门控制器的双向通讯能力使你可以通过远程识别每台仪表,检验它的校准情况,查阅对比以前存储的维修记录及其他更多信息,达到尽快启动回路的目的。
3)便于选取信息:FIELDVUE数字式阀门定位器和变送器应用HART通讯协议可以方便地选取现场信息。如实地看到控制过程的基础——控制阀本身——在阀门或现场接线盒上借助于手持通讯器,在DCS控制室借助于个人计算机或操纵员的控制台。
采用HART协议也意味着FIELDVUE仪表可以组合在集成系统之内,或作为自成一体的控制设备来用。这种多方面的适应性,使得无论现在或将来,系统设计工作更为方便轻易。
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DS3800NBIC1H1E
1.2.3 自诊断与控制能力
1)现场总线的通讯
所有DVC5000f数字式阀门控制器都包含现场总线通讯能力,包括A0功能块及下列诊断:
a)关键阀门使用跟踪参数;
b)仪表健康状态参数;
c)预定格式阀门性能阶跃维护测试。
关键阀门使用跟踪参数可监控阀杆的总行程(行程累积)及阀杆行程转向(周期)的次数。假如仪表的内存、处理器或检测器有任何题目,则仪表的健康状态参数报警。一旦有题目发生,可确定该仪表将如何对该题目作出反应。假如,若压力检测器有故障时,仪表是否应当封闭?也可选择哪一个元件出毛病将引起仪表封闭(是否题目严重,足以引起封闭)。这些参数指示以报警形式报告。监控性报警可以提供有关有题目的仪表、阀门或过程的瞬间指示。
2)标准控制与诊断
所有DVC5000f数字式阀门控制器都包含标准的控制与诊断。标准控制包括A0与PID功能块。标准诊断包括下列诊断测试:a)动态误差带;b)驱动信号;c)输出信号。
动态误差带、驱动信号及输出信号是动态扫描测试。这些测试是在被控制的速度下转变传送器块(伺服机构)的设定点并绘出阀门的操纵以确定阀门的动态性能。例如,动态误差带测试是滞后与死区加“回转”。滞后与死区是静态的质量。然而由于阀门是在运动着的,就带来了动态误差和“回转”误差。动态扫描测试给出了较好的指示,即阀门在过程条件下将如何操纵,那将是动态而不是静态。在个人计算机上运行ValveLink软件可完成标准与*诊断测试。
3)*诊断
具有*诊断的仪表可完成标准诊断所包含的动态扫描测试内容加上第4个动态扫描测试,即阀门特征测试以及4个阶跃诊断测试。阀门特征测试可让您确定阀门/执行机构的摩擦力、台架测试压力信号范围、弹簧刚度及阀座封闭力。
4)过程总线
费希尔控制设备性能服务部分可使用具备过程诊断能力的仪表来评估阀门、过程及变送器而基金会现场总线控制回路仍处于自动状态,而且过程继续生产产品。利用过程诊断,性能服务部分将能够识别与找出哪一个过程的组成单元有可能今天引起质量题目。尽管过程诊断需要启动运行,其终点却是要由过程或操纵员干预才能确定的。过程诊断可同时在多个阀门上进行。
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Origin PKG-409 Board
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Factory Set 050 mA Trip Test
Hakko 850D SMD Rework Station To Parts
Cincinnatii Test Systems CM245 0-110XXAG/3/206?-211-31A
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Ohio Semitronics Ct7-004D
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T2592601 60649-1A
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Schmersall AES 1135
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Enlarge
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