I want to find some knowledge about chemical automation instrumentation maintenance

The 8 methods of instrumentation maintenance 1. When using the multimeter ohm block, remember not to measure with electricity. 2. When using the logic pen and oscilloscope to detect the signal, be careful not to make the probe touch the two measurement pins at the same time, because the essence of this situation is the formation of a short circuit in the case of charging. 3. Detect the power supply filter capacitors, electrolytic capacitors should first be shorted to the positive and negative electrolytic capacitors, and short-circuit should not be used to replace the pen line to discharge the capacitor wire, because it is easy to burn off the core wire. You can take a 220V, 60-100W lamp with a lamp lead, connected to both ends of the capacitor, in the discharge instant bulb will flash. 4. In the humid environment overhaul instrumentation failure, the printed circuit with a multimeter to measure whether the points are smooth is necessary, because the main fault in this case is the corrosion of copper foil. 5. When overhauling the internal circuit of the instrument, if the contacts of the installed components and the circuit board are coated with insulating varnish, the parameters of the measurement points can be used to weld an ordinary hand sewing needle on the pen of the multimeter in order to puncture the paint layer to directly measure the various points, without having to peel off a large area of the paint layer. 6. Don't plug and unplug various control boards and plugs with electricity. Because in the case of power, plugging and unplugging the control board will produce a strong inductive electromotive force, then the instantaneous backlash voltage is very high, it is easy to damage the corresponding control board and plug. 7. Do not blindly knock and touch when overhauling, so as not to expand the fault, the more repair the worse. 8. When disassembling and adjusting the instrument, the original position should be recorded in order to recover. 9. Repair of precision instruments and meters, such as inadvertently small parts pop-up fly, should first judge the possible fly off the place, do not look for the East, the West turned over, you can take the magnet scanning and line-of-sight scanning methods to look for. In short, in the instrumentation maintenance work, first of all, should understand the basic principles of instrumentation, and master the knowledge and skills related to electronics, and should be prepared for all the instrumentation manuals, drawings and other technical information, in addition to the quality of work should be developed into a good quality of work, so as to improve the efficiency of the maintenance work in the instrumentation, reduce errors. 8:48:57 Maintenance of large analytical instruments 1, the correct use: the operator should carefully read the instrument operating instructions, familiar with the performance of the instrument, to master the correct method of use. In strict accordance with the operating procedures to open and close the instrument, so that the instrument is always maintained in a good state of operation. To pay attention to the use of supporting equipment and facilities and maintenance checks, such as gas generators, cylinders, power supply, water system, etc., to avoid the instrument in the working state of gas, electricity, water cuts. 2, environmental requirements:Precision instruments have high requirements for the environment. First of all, there should be a clean laboratory, if the instrument or the surrounding environment is full of dust, once the dust into the optical system of the instrument. Will certainly affect the sensitivity of the instrument. Dust will also often cause poor contact between parts or due to the absorption period leading to poor electrical insulation properties and affect the normal use of the instrument. Therefore, the cleaning work seems ordinary. Instrument maintenance is an indispensable and important work. Environmental temperature and humidity have a great impact on the instrument. As electronic components, especially integrated circuits require a suitable temperature range. Therefore, in order to ensure the accuracy of the instrument and extend its service life, the instrument should always be in line with the requirements of the ambient temperature. Instruments for the requirements of environmental humidity should also be given sufficient attention, especially in geographic locations such as Shanghai, the rainy season when the humidity in the room is often high, and humid environments are very easy to cause rust and damage to the device, resulting in failure. Humid environment is also easy to make the instrument insulation performance deterioration, resulting in unsafe factors. Usually you can use the dehumidification function of the air conditioner to control the humidity of the laboratory, if necessary, should be specially equipped with dehumidifiers. The desiccant placed inside the instrument must be checked regularly, once the failure to be replaced in a timely manner. Another point worth mentioning is the corrosion of the instrument. Analytical instruments are dealing with chemicals, often easy to cause chemical residues on the instrument. In addition, many volatile chemicals once close to the precision instruments, may have a corrosive effect on the instrument. Over time. Invisible will damage some parts. Therefore, to maintain a good instrument should be done every time the use of the finished cleaning and maintenance work in a timely manner, do not let the chemical residue on the instrument c some chemical solvents are not easily noticeable to the naked eye, but will erode the printed circuit boards, must pay attention to. To ensure that precision instruments away from the source of corrosion, usually should pay attention to do a good job of environmental monitoring. Shockproof is also one of the basic requirements of the instrument on the environment. Precision instruments should be placed on a solid and stable experimental platform or pedestal. 3, power requirements: large precision instruments on the power supply requirements are high. Good power supply for the precision and stability of the instrument is extremely important. Surge voltage from the grid and transient pulses on the instrument is extremely harmful, will destroy the scanning electron microscope and computer work, resulting in signal image distortion, but also interfere with preamplifiers, micro-current amplifiers and other components work. Although the instrument generally has its own power supply voltage regulator function, or should ensure that the power supply voltage stability, waveform distortion is small and has a correct and good grounding and so on. Large instruments should be individually buried deep grounding and good anti-interference measures, such as the use of isolation transformers to ensure the sensitivity and reliability of the instrument. Unstable power supply will cause gas chromatograph, liquid chromatograph and polarographic instrument work baseline instability, testing is difficult to get the correct results. In order to prevent instruments, computers in the work of the periphery of the sudden power outage caused by damage or data loss, it is recommended to use a highly reliable UPS power supply, so that not only to improve the power performance but also in the case of abnormal power outages to do a safe shutdown. 4, regularly energized: in the instrument for a longer period of time out of service, maintenance work is equally important. Do not take lightly. During this period should be done 1 to 2 times a week power on and off, both moisture and can make the instrument is always kept in working condition, not in the long term shutdown after the instrument's performance indicators have changed significantly. This is very beneficial to the instrument. 5, regular calibration: analytical instruments for profiling, testing and inspection of samples, is the main tool for analysts, it can play the role of the human eye can not play. The microcosm of the material fully displayed in front of people's eyes. The data provided by the instrument is often used for quality control, legal, medical, trade and other occasions. Should strive to detect the accuracy and reliability of the results. To do this, in addition to the correct analysis method. The instrument itself meets the requirements is also a necessary prerequisite. Therefore, should be in accordance with national metrological verification procedures or instrument manuals provide the methods and standards (charts) of the instrument on a regular basis to carry out their own calibration and commissioned by a qualified unit calibration. So that the instrument is always in the measurement of the controlled state, to ensure the accuracy and reliability of the value. For trade settlement, safety and security, health care, environmental monitoring and public services need to issue inspection reports on the instrument should be measured in accordance with the "Measurement Law" provides for the implementation of mandatory inspection. 6, make a good record: the instrument should be carefully done instrument work records, including the instrument status, start or maintenance time, operation and maintenance personnel, work and other worthy of recording the contents of the record for inspection. On the one hand, this can provide sufficient data for future statistical work, on the other hand, you can also grasp the use of certain parts that need to be replaced regularly, to help identify the normal consumption or failure