4 major fault solutions for pressure transmitters in the pharmaceutical industry

With the development of intelligence, pressure transmitters are becoming more and more popular in the pharmaceutical industry. It is not only easy to install, inexpensive, compatible with all equipment, and realizes remote transmission functions, but there will always be such and such small faults in operation. , the occurrence of faults is not terrible. The key is to learn to judge how these faults occur, and to be able to have a good solution immediately. The following is a detailed explanation of the four major fault solutions of pressure transmitters by old users in the pharmaceutical industry. The fault parts of the transmitter are generally divided into two categories: sensor faults and electronic detection and amplification conversion faults. The sensor is generally not prone to problems. Under normal circumstances, it is generally not necessary to consider the problem too much, and the electronic circuit part should be checked. The failures of pressure transmitters are accidental and inevitable. We take the pharmaceutical industry as an example. Their pressure transmitters can be said to be operating under high load for 24 hours, and failures are inevitable. This requires our users to be more Check and maintain, once there is a problem, look at how the old users in the pharmaceutical industry operate. When checking, you should first judge the fault from the largest to the smallest. Look at whether there is any damage to the appearance, and look at whether the internal components are burnt out. , or aging, check it step by step, so as to deal with the fault so that the scene is not chaotic, but also to ensure the safe operation of other machines. The common failures in the pharmaceutical industry are mainly caused by the following four failures. Let us analyze and propose solutions one by one. Common failure analysis and solutions 1. Failure phenomenon - the output of the transmitter is unstable. Analysis: The occurrence rate of this kind of fault is very common, and it is often the rear pole of the circuit that is damaged. When testing the DC voltage of the multimeter, temporarily adjust the voltage of pin 3 to zero. During the test, if the voltage of pin 3 changes, then The front loop is normal, and the voltage of pin 6 is measured at the same time. If there is a signal output, it can be judged whether IC3 and the peripheral bias loop are normal. At the same time, the output of pin 6 should have a voltage signal output, so that it can be judged whether IC3 and the peripheral bias circuit are normal. 2. Fault 2 No signal output. When this kind of fault occurs, the troubleshooting process is generally carried out by increasing or decreasing the pressure. There are two common test results. One is that when the pressure is increased, the signal output value of the transmitter does not increase accordingly; the other is Second, when there is pressure, the transmitter has no signal output. When these two situations occur, mainly check the pressure tube and connection method. The pressure pipe mainly checks whether there is air leakage and whether there is dripping at the node. If there is no problem with the pressure pipe, check the connection method, such as whether the connection is correct, whether there is a loophole in the connection method, etc., and then check the power supply. The power supply is also normal and there is no problem. Finally, you need to check whether the voltage of the transformer is normal. Only by step-by-step investigation and strict inspection can the specific cause of the problem be determined and a correct troubleshooting decision can be made. 3. Fault 3 The output signal is unstable. The phenomenon of this kind of failure is generally that the output signal value changes irregularly and jumps under the condition of a certain pressure. When encountering this kind of failure phenomenon, the pressure source itself must be determined first, because the pressure source itself is an unstable pressure, which is affected by the environment, instruments and electromagnetic interference. When checking the pressure source, it should also be checked accordingly. Whether the power supply of the transformer is normal and stable and whether the voltage regulator circuit is normal, there is another problem that is easily overlooked, that is, when checking the circuit board, we must pay attention to whether there is a problem of soldering on the circuit board, find it in time, and deal with it in time . 4. Fault Four signal output is non-linear. This kind of fault phenomenon is generally manifested as a sudden change in the output of the transformer, and the zero position of the pressure relief transmitter cannot be returned. Generally, the cause of this phenomenon is likely to be the cause of the pressure sensor seal. When the sealing ring is too soft or too thick, it is easy to block the sensor after being compressed, and the pressure medium cannot enter, but when the pressure increases and the sealing ring is punched, the pressure will suddenly increase, thus affecting the pressure sensor. The best way to eliminate this kind of fault is to remove the sensor and directly observe whether the zero position is normal. If it is normal, it can be judged that the cause of the problem is the sealing ring, and then the sealing ring can be replaced and tested again. The above are the four common faults and troubleshooting methods in the pharmaceutical industry. Usually, as long as you pay attention to more inspections and maintenance, you can deal with the failure of the pressure transmitter in an emergency.
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