ach instrument factory, including our South control instrument, can not guarantee that every instrument sold can achieve zero failure, which is related to the structure of the instrument and the operation habits of the on-site operators. Therefore, the instrument maintenance work is also essential, it is a tedious and very patient.

When analyzing the cause of malfunction of field instrument, particular attention should be paid to the characteristics of the controlled object and control valve, which may be the cause of the malfunction of the instrument system on the spot. Therefore, we must carefully analyze from two aspects, considering the field instrumentation system and process operating system, check the reason, measuring parameters of field instruments are generally divided into temperature, pressure, flow and level Four parameters.

First of all, before the fault analysis of on-site inspection instrument system to parameter changes to the operating workers load and raw materials for the production of the record curve view the fault instrument, comprehensive analysis, to determine the cause of instrument failure.

Secondly, in the analysis of field instrument failure, to compare a thorough understanding of design intent of design scheme, instrument system, structure, characteristics, performance and parameters of instrument, instrument system production process, production process and conditions etc..

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The flow control instrument system indication value reaches the minimum hour. First, check the field test instrument. If normal, the fault is displayed in the meter. When the field test instrument instructions are minimal, then check the valve opening, if the valve opening is zero, it is often between the regulator to the regulator fault. When the field instrumentation indicates minimum valve opening is normal, the fault reason is quite likely the system pressure is not enough, digital display control instrument system pipeline plugging, pump does not amount, medium crystallization, improper operation and other causes. If the instrument fault, the reasons are: orifice differential pressure flow meter may be positive pressure lead pipe block; differential pressure transmitter positive pressure chamber leakage; mechanical flowmeter is gear stuck or filter net plug. Yiqiclub.haotui.com'F1 w$D3 O1 s q$c+ A6 _/, X

When the flow control instrument system indicates the maximum value, the detection instrument will often indicate the maximum. At this point can manually remote control valve opening or closing small, if the flow can be reduced, the process is generally responsible for the cause. If the flow value does not drop down, it is the cause of the instrument system, check the control flow meter system regulating valve action; check pressure measuring system is normal; check the signal transmission system is normal.

Flow control instrument system indication frequent fluctuations, can be changed to manual control, if the fluctuation is reduced, cause the instrument or meter control parameter PID is not appropriate, if the volatility is still frequent, is caused by the process operation reasons. China instrument to create the most professional professional forum China instrument forum, equipment supply and demand information, equipment information, technology forum instrument, instrument information exchange forum forum! 3 |, S1 X5 t* (C& O Y2 C

Two 、 liquid level control instrument system fault analysis

When the indicating value of the liquid level control instrument system changes to the maximum or the minimum, you can check the instrument to see whether it is normal or not. If the indication is normal, change the level control to manual remote control level to see the change of the liquid level. If the level of liquid can be stabilized in a certain range, then the fault in the liquid level control system; if the liquid level is not stable, the process system is generally caused by the fault, from the process to find the reasons. Instrument, meter, instrument forum, equipment supply and demand information, equipment information, information technology forum instrument, instrument instrument instrument forum, forum, forum, e+ Q# n t: k'V J4 H1! {# Q

Differential pressure type liquid level control instrument and field emission type indicating instrument instructions on site, first check the direct reading instrument is normal, if normal check indicator, negative pressure differential pressure level meter tube sealing whether there is leakage; if there is leakage, re potting fluid, zero leakage, is possible; no amount of negative transfer instrument, re adjust the amount of migration makes the instrument indication. China instrument to create the most professional professional forum China instrument forum, equipment supply and demand information, equipment information, technology forum instrument, instrument information exchange forum forum! 4 Y* C, D @+ ^!

When the indicating value of the liquid level control instrument system fluctuates frequently, first of all, the capacity of the liquid level control object should be analyzed to analyze the cause of the fault, which is caused by the instrument fault.  Small capacity, first of all to analyze whether the operation of the process changes, and if there is change, it may be caused by frequent fluctuations in the process. If there is no change, it may be caused by instrument failure.

Users in the process, such as the instrument does not display the normal problems, it will be a matter of concern, but careful investigation can always find the root of the problem. South control instrument for the vast number of users on-site inspection, will do your best to serve you.