Industrial automation instrument failure analysis and solution
The introduction
With the constant improvement of the level of science and technology, the rapid development of social economy, people become more and more high to the requirement of industrial automation instrument. Nowadays, there are many problems in the industrial automation instrument are in urgent need of solution, therefore, to strengthen the study and application of advanced and advanced technology, continuous and maintenance of industrial automation instrument analysis method, the industrial automation instrument more applicable and reliable.
1, the types of industrial automation instrument
❶ flow meter
Flow meter also has a variety of, according to its measuring principle in general can be divided into direct method, derivation method of mass flowmeter, the speed, volume volume flowmeter; If segment is rotor type, throttle, speed, displacement, etc.
❷ pressure gauge
At present there are many types of the principle of pressure gauge, and can be used for powder, sticky, pulse, high temperature, easy to crystallization medium pressure measurement. Pressure efficacy elastic type, liquid column type, piston type three categories. Regular on-site measurement and control of pressure regulator.
❸ liquid level meter
Chemical industry in general to monitoring the level of raw materials, semi-finished products and finished products. According to measurement methods are divided into buoyancy type, radar type, matrix eddy current type, magnetic telescopic, etc.
❹ temperature instrument
At the scene of the production or the temperature inside the pipe is generally need to measure control, non-contact measuring method is often used at present, the most commonly used is thermocouple, heat resistance. Along with the popularization and application field bus technology, signal from thermocouple, heat resistance directly into DCS or other temperature acquisition instrument, to realize the automatic temperature control.
❺ online process analyzer
Online process analyzer can make the chemical production process fully automated control and analysis, in the actual application often need the support of precision analysis instruments, mainly with mass spectrometry, gas chromatography, liquid chromatography and other analytical instruments.
2, the significance of the analysis of the industrial automation instrument and maintenance
With the application and popularity of the production of industrial automation, industrial automation instrument in the use of more and more common, but through the observation, the survey found, industrial automation instrument in industrial enterprises in the production of all kinds of fault, the need to strengthen the management of daily maintenance work. The application level of industrial automation instrument technology can effectively reflect the enterprise production control level, scientific and industrial automation for instrument maintenance effectively, not only can keep the instrument in good condition, also can effectively extend the service life of instrument, and can effectively reduce the cost of the application of instrument for the to work well in a long cycle, key initiatives is to give a good preventive maintenance. Industrial automation instrument configuration and when used to measure the overall strength of an enterprise and running status of an important basis, its high technical content, have higher request for management and maintenance, and other liquid. Only enterprises based on the actual need to configure the qualified industrial automation instrument, for its effective management and maintenance, preventive maintenance, correct prevention and maintenance measures, to make it work better, extend the life of the instrument. In the process of industrial automation instrument in use, because of the accident after the repair is more complicated and expensive, prevention measures and maintenance is very necessary.
3, industrial automation instrument common faults
(1) the basic principle of
At present our country's industrial production process used in the industrial automation instrument is a part of the industrial automation control system, that is, a kind of operation condition of the existing production conditions of industrial automation monitoring system, in general, to realize the production of industrial automation management and monitoring, need the following three aspects to form industrial automation instrumentation: 1, sensors: is the role of the device detection to the production of information and signal into recognizable way; 2, transmitter: that is to say, the sensor signal effectively, and get the current output, and realize mobile process control and management; 3, display: will measure results in a more accurate and straight the way of display, for the operator to adjust the production status of the existing and debugging.
(2) pressure control instrument common faults
Determines the characteristics of pressure control instrument are prone to such as rapid oscillation in the process of running again a volatile situation, in this case the staff should first of all its own operation, that is easy to produce because of improper operation and control of such issues, excluding the need for pressure pipe inspection and related to the connection of lines, basically you can find out the fault position.
(3) flow control industrial automation instrument common failure analysis
If flow control industrial automation instrument indicates numerical, the testing instrument is also no problem, also prove fault on the display instrument; Field detection instrument also show that , if you need to confirm valve opening, if the opening is zero problem between the regulator and the regulator; If the valve opening is normal, failure of the cause caused is usually caused by a lack of system congestion, pipeline system pressure, error, etc. If numerical maximum flow control industrial automation instrument, instrument measuring numerical indication is biggest, regulating valve size, flow decrease is proved to be caused by improper operation, if the value not drop down, to check whether there is any action on traffic control instrument regulating valve, pressure system is normal or not. If the instrument for the wave number is more, instead of manual control, if the fluctuations decrease prove the cause of the problem is the PID Settings is not accurate, if the number of fluctuations, is caused by the operation.
4, industrial automation instrument maintenance methods
The need of industrial automation instrument maintenance management manner, in accordance with the stipulations of its prevention and maintenance must be required in accordance with the specific instrument Settings of the arrangement. Industrial automation instrument enterprise USES at present is more, the daily malfunction analysis and maintenance and therefore increased the difficulty. Industrial automation instrument maintenance needs to have the support of scientific and effective inspection system, and the instrument regular checking and irregular spot checks, the problems in a timely manner and to improve, to in a timely manner to eliminate hidden problems must also ensure the normal operation of industrial automation instrument .
(1) system maintenance methods
I formulate scientific inspection system
Industrial automation instrument checks need to have scientific examination system, management personnel comply with relevant system of instrument for inspection. Censorship should be formulated according to the attribute of industrial automation instrument and operating rules, in addition to the instrument in use process to inspect again, and check for preventive maintenance. Managers check need to have a clear division of responsibilities, each one is sure to the corresponding specific scope, the malfunction of the instrumentrepair in a timely manner, will be in a timely manner to eliminate safety concerns, guarantee the progress of the industrial automation instrument.
Ii set up perfect drainage scheme
Industrial automation instrument requires regular drainage, will be ruled out, occurring in the process of running journals to guarantee the normal work of the instrument. Sewage main object is easy to deposit, easy to be crystallized media, the deposition of the medium will run in the way of instrumentation, easy to cause instrument malfunction. So set up perfect drainage scheme for instrument maintenance is crucial to the establishment of the scheme should be targeted, according to different corresponding plan formulation, instrument to ensure smooth operation of the industrial automation instrument.
Iii for lightning protection anticorrosion measures
Industrial automation instrument of high performance, but also easily influenced by outside factors. Thunder and lightning and corrosion on the influence of the industrial automation instrument is very big, so the lightning protection, anti-corrosion measures will need to do, try to reduce their impact on the industrial automation instrument . Lightning protection measures are mainly to ground handling, the external lightning protection material for protection, to reduce the influence of lightning on industrial automation instrument operation. Industrial automation components typically because exposure to strong acid, strong alkali, corrosion gas and corrosion, so as to cause harm to production. After corrosion of instrument its internal parts easy to damage, so as to affect its normal operation.