⎝⎛星力捕鱼⎞⎠

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Industry Information
Judgment and Analysis of DX-Differential Pressure Transmitter in Application
2011-9-13 15:24:35

在测量 过程中 ,有时 会出现一些故障 During the measurement of the transmitter , some faults sometimes occur . 及时判定分析和处理故障 对正在进行 生产来说 非常的 重要 ,东祥仪表的技术人员 根据日常维护中的经验 总结归纳了一些分析方法和分析流程 It is very important for the ongoing production to judge and analyze the fault in time . The technical staff of Dongxiang Instrument summarizes some analysis methods and analysis processes based on the experience in daily maintenance :

调查法 故障发生前的打火 冒烟 异味 供电变化 雷击 潮湿 误操作 误维修 1. Investigation method : Recall the fire , smoke , odor , power supply change , lightning strike , humidity , misoperation , and maintenance before the fault occurred .
     观察回路的外部损伤 导压管的泄漏 回路的过热 供电开关状态等 2. Intuitive method : observe the external damage of the circuit , the leakage of the pressure guiding tube , the overheating of the circuit , the state of the power switch, etc.
     3. Detection method :

1 断路检测 将怀疑 故障部分与其它部分分开来 查看故障 是不是 消失 ( 1 ) Open circuit detection : Separate the suspected fault part from other parts and check whether the fault disappears . 则确定故障所在 否则 进行 下步查找 If it disappears , determine the fault , otherwise go to the next step . 智能差压变送器不能正常Hart 远程通讯 将电源从表体上断开 ,在 现场另 加电源的方法为变送器通电进行通讯 便 查看 是不是 电缆叠加约2KHz 的电磁信号而干扰通讯 If the Smart Differential Pressure Transmitter cannot communicate with Hart remotely , you can disconnect the power supply from the meter body and add another power source on site to power up the transmitter for communication in order to see if the cable is superimposed about 2KHz Electromagnetic signals that interfere with communication .
在保证安全的情况下 将相关部分回路直接短接 2) Short circuit detection : Under the condition of ensuring safety , short the relevant part of the circuit directly . 差压变送器 输出值偏小 时, 将导压管断开 从一次取压阀外直接将差压信号直接引到差压变送器双侧 观察变送器输出 以判断导压管路的堵 漏的连通性 For example , if the output value of the differential pressure transmitter is too small , you can disconnect the pressure guiding tube , and directly direct the differential pressure signal to the two sides of the differential pressure transmitter from outside the pressure taking valve, and observe the output of the transmitter. In order to judge the blockage and leakage of the pressure-conducting pipeline .
将怀疑有故障的部分更换 判断故障部分 3) Replacement detection : Replace the suspected faulty part to determine the faulty part . 怀疑变送器 电路板发生故障 的, 临时更换一块以确定原因 For example , if you suspect that the transmitter 's circuit board is malfunctioning , you can temporarily replace one to determine the cause .
将测量回路分割成几个部分 供电电源 信号输出 信号变送 信号检测 按分部检查 由简 复杂, 由表及里 缩小范围找出故障位置 4) Segment inspection : Divide the measurement circuit into several parts , such as : power supply , signal output , signal transmission , signal detection , inspection by division , from simple to complex, from the table and the inside , narrow down to find the fault Location .