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Flow meter series
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Industry Information
Daily maintenance of automated instruments
2011-9-8 15:18:54

Daily maintenance of automated instruments

随着石化、钢铁、造纸、食品、医药 等行业 自动化水平的不断提高, 因此 对现场仪表 维护人员的技术水平提出了更高 要求。 As the automation level of petrochemical, iron and steel, papermaking, food, medicine and other industries continues to improve, the technical level of field instrument maintenance personnel has been put forward to higher requirements. 缩短处理仪表故障时间,保证安全提高生产经济效益, 以下是 仪表现场维护经验, 仅供 参考。 In order to shorten the processing time of instrument failure and ensure the safety and improve the economic efficiency of production, the following is the field maintenance experience of the instrument for reference only .
仪表 测量 压力 仪表 测量 流量 仪表 测量 液位 仪表 测量 Field instrument measurement is generally divided into four types: temperature instrument measurement , pressure instrument measurement , flow instrument measurement , and liquid level instrument measurement .
以上 测量参数的不同,分析不同的现场仪表故障所在。 According to the above measurement parameters, analyze the faults of different field instruments.
1 . 必须要相对 透彻地了解相关仪表系统的生产过程、生产工艺情况 及条件, 同时还要 了解仪表系统的设计方案、设计意图 仪表系统的结构、特点、性能及参数要求等。 Before analyzing on-site instrument failures, you must have a thorough understanding of the production process, production process, and conditions of the relevant instrument system, as well as the design scheme, design intent, and structure, characteristics, performance, and parameters of the instrument system. Requirements etc.
2 . 必须 要向现场操作 人员 了解生产的负荷 及原料的参数变化情况, 还要 查看故障仪表的记录曲线,进行综合 分析,以确定仪表故障原因所在。 Before analyzing and checking the failure of the on-site instrumentation system, it is necessary to understand the production load and the changes in the parameters of the raw materials from the on-site operators , and also check the record curve of the faulty instrument for a comprehensive analysis to determine the cause of the instrumentation failure.
3 一条死 线 者是 记录曲线原来为波动,现在突然变成一条直线 的,这两种 故障很可能 仪表系统 的原因 If the instrument recording curve is a dead line without any change ; or if the recording curve originally fluctuated, it suddenly becomes a straight line . These two failures are likely to be the cause of the instrument system . 记录仪表大多是DCS 计算机系统,灵敏度非常高, 因此 参数的变化能 非常灵敏的反应出来。 Because the current recording instruments are mostly DCS computer systems, the sensitivity is very high, so changes in parameters can be reflected very sensitively. 以手动 地改变一下工艺参数,看曲线变化情况。 At this time, you can manually change the process parameters to see the curve changes. 果没有 变化,基本 可以 断定是仪表系统出了问题;如 有正常变化,基本断定 仪表系统没有 大的问题。 If there is no change, it can basically be determined that there is a problem with the instrument system; if there is a normal change, it is basically determined that there is not much problem with the instrument system .
4 . 变化工艺参数时, 如果 发现记录曲线发生突变或 跳到最大 最小, 也可以说明 此时的故障在仪表系统。 When changing the process parameters, if it is found that the recording curve changes suddenly or jumps to the maximum and minimum, it can also indicate that the fault at this time is in the instrument system.
5 . 故障出现以前 仪表记录曲线一直表现正常, 然而 出现波动后记录曲线变得毫无规律或 使系统难以控制,甚至连手动操作也不能控制, 那说明 此时 故障可能是工艺操作系统造成的。 If the instrument recording curve always behaves normally before the fault occurs , but after the fluctuation occurs, the recording curve becomes irregular or makes the system difficult to control, even manual operation can not control, then the fault at this time may be caused by the process operating system of.
6 . 计算机系统 显示仪表不正常时,可以到现场检查同一直观仪表的指示值,如果 发现 它们差别很大,则可能是仪表系统出现故障。 When the DCS computer system shows that the meter is abnormal, you can go to the site to check the indication value of the same intuitive meter. If they are found to be very different, the meter system may be faulty.
   分析现场仪表故障原因时, 要特别注意被测控制对象和控制阀的特性变化, 因为 这些都可能是造成现场仪表系统故障的原因。 In general , when analyzing the cause of field instrument failure, special attention needs to be paid to the characteristics of the control object and the control valve, as these may be the causes of the field instrument system failure. ,我们 必须 要从现场仪表系和工艺操作两 系统 方面综合考虑、仔细分析,检查原因所在。 Therefore , we must comprehensively consider and analyze the two aspects of the field instrumentation system and the process operation system to check the reasons.