Discussion on Issues in Instrument Selection
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Instrument selection is the most important factor when making choices; the quality of performance in later use is directly related to this selection. However, there are also experiences and lessons to be learned from this process, and I hope everyone will share them so that others can avoid making the same mistakes at work. The content should focus on the key data used in previous instrument selections, the problems that arise during use, how to make improvements, and the results of those improvements, in order to facilitate communication and sharing. I will reward everyone with the highest scores possible, and I hope everyone will participate actively. Those content that is worth learning will receive positive rewards. The main format should be as follows (I hope everyone will improve it): Key data from previous selections: Problems that occurred during use: How to make improvements: Results after improvements:
Just to get things started, remember to choose an ultrasonic level gauge； Upon returning, it was found that the selection failed because foam was always present on the surface of the industrial medium. Root cause: The on-site environment was not analyzed carefully.
Recently, our company purchased an E+H electromagnetic flowmeter, but it cannot be used after installation. The reason is that electromagnetic flowmeters require the medium to be conductive. The purchased electromagnetic flowmeter is installed in pipes containing a mixture of organic solvents, which are non-conductive.
When selecting pressure transmitters, it is essential to take all relevant conditions into consideration. When our company was choosing pressure transmitters for one of its production units, it failed to account for the possibility of brief periods of negative pressure; as a result, the instruments did not have the capability to handle negative pressures, which led to frequent failures of the transmitters.
When selecting a vacuum control valve, due to a lack of experience and specific parameters, we chose a valve with a diameter equal to that of the pipeline; as a result, it could not be used after the system was put into operation
OP, should I choose one that’s smaller than the pipe? Why can’t they be the same size?
We measured the flow rate in the gas pipeline and chose a vortex flow meter; however, after installation, the error was too large to make it usable. Reason: The significant vibration of the gas pipeline was not taken into account.
We did not take into account the pipe diameter in the cooling water system, and as a result, the control valves purchased were unable to perform their regulatory function due to the small diameter of the pipes.
Reply to floor 6: This may be related to the sealing performance and flow capacity of the valve