How can there be so many shortcomings? For the troubleshooting method of chemical instrumentation, Xiaobian wants to speak up here.

  How can there be so many bad and insufficient places? When using the flowmeter, there will be some unavoidable small situations. Here, for the fault maintenance method of chemical instruments, the editor has something to say here, more It is for everyone who is using the flowmeter to solve various problems. Follow the footsteps of the editor, let us find out what are the small methods of troubleshooting, I hope it can be helpful to everyone.

  1. Power-off inspection method

  Power failure inspection can carry out comprehensive maintenance of instruments and meters, and is also the inspection method commonly used and the most preferred by enterprises. When using this method, it is necessary to read the instruction manual of the instrument before starting the inspection work, understand the internal composition, operation mechanism and working principle of the instrument, fully grasp the description of the relevant accessories of the circuit diagram, and make sure to understand the instrument before starting work; secondly, it should be Check the condition of the pointer, dial and button on the instrument, check whether the button is loose, the position of the dial is deviated, etc., and check the integrity of the fuse. You can also open the cover of the instrument and meter, check the internal components of the instrument and meter, check whether there is mold, burn, etc., replace the burned parts, determine the possible safety hazards of the instrument and meter, and ensure the stable operation of the instrument and meter.

  2. Power transmission inspection

  (1) Measuring voltage method. If the instrument does not work properly, there will be a phenomenon of abnormal voltage, so by measuring the voltage, the operating status of the instrument can also be obtained, and the reason for the abnormality of the instrument can be analyzed. When using this method, it is necessary to carry out measurement work according to the working principle diagram of the instrument, directly measure the voltage points at all levels of the instrument, and then determine the voltage value at each position, and analyze whether the instrument is abnormal. If the obtained voltage measurement result is different from the value in the instrument manual, it can be preliminarily determined that the abnormal voltage location is the fault location, and you can continue to investigate the location. If the difference between the voltage values is found to be relatively small after comparison, it means that the static operation of the circuit is normal, which proves that it can continue to be used. This method is generally used in integrated circuits, transistors, and electronic tubes, and has a good effect on the detection of electronic components.

  (2) Simple interference method. The simple interference method is a very important detection method in the power transmission inspection, and has a relatively good effect in the maintenance of digital processing instruments, analytical instruments and recording instruments. The method is to touch the signal input terminal with a small screwdriver, input the interference signal, and then observe the indication of the pointer, and then judge the possible problems of the instrument according to whether the pointer is displaced. This method needs to be carried out on the basis of determining the power transmission circuit, and must be carried out in a step-by-step manner, and then checked according to the order from back to front. In the specific implementation process, the level where the pointer does not move is faulty. Using this method makes use of the current relatively complete operation system of the instrument, which can quickly respond to any external disturbances. If there are external factors involved, the pointer will move significantly. If there is no change, it means that the instrument is damaged, which is convenient for the initial inspection personnel. Determine the fault location.

  3. Instrument failure analysis method

  If a chemical instrument runs abnormally at work, technicians can analyze the abnormal situation to determine the cause of the abnormality and failure of the instrument, and formulate maintenance strategies according to the abnormality and failure to restore it to a normal operating state. When the instrument is different, the maintenance method used will also be different. Therefore, maintenance personnel need to understand the possible faults of different types of chemical instruments, so as to facilitate the acquisition of fault information, they can quickly judge the cause of the fault, and select a reasonable inspection method to quickly determine the cause of the fault, so that the chemical instrument can be restored as soon as possible. normal.

  4. Maintenance method of temperature instrument

  When the temperature meter fails, the failure phenomenon includes the sudden decrease of the displayed value of the temperature meter and the sudden increase of the displayed value. If the displayed value of the temperature meter suddenly becomes small, the temperature meter may have problems such as short circuit of wires, short circuit of thermocouple and short circuit of thermal resistance. The weak link, if it is found that the on-site temperature rises but does not change, it means that there is a liquid that is easy to evaporate inside the temperature measuring element. For the sudden increase of the displayed value of the temperature instrument, it is mainly caused by the disconnection of the wire, the looseness of the terminal, the open circuit of the thermocouple, etc. To check this kind of fault, the inspector needs to judge the position of the temperature display and determine the layout of the associated circuit. A multimeter can be used. Carry out an inspection and then determine the fault point based on the resistance reading.

  Well, I don’t know if you have tried the above methods. I just shared my opinions. If you have other good ideas or opinions, please feel free to call or consult with the editor online to learn more. The knowledge of flowmeter is all in Weihai Kunke Flowmeter Co., Ltd.