Which type of level gauge is more accurate
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For micro-positive pressure storage tanks filled with diesel and NMP solvent, which type of level gauge is more accurate for measuring the level on-site and for remote monitoring? What are the precautions during installation? Previously, glass tube level gauges were used on-site, while magnetic flap level gauges were used for remote monitoring; however, both types had significant errors. In my opinion, glass tube level gauges operate on the principle of a U-tube – when mixed feed enters from above, the rising liquid level causes the fluid at the bottom to rise as well, resulting in inaccurate readings. When the mixed feed enters from below and settles, the movement of the tank walls also affects the accuracy of the level gauge. I’m not sure if this understanding is correct
For micro-positive pressure storage tanks containing diesel and NMP solvent as the medium, both on-site level gauges and remote level gauges can be used. The advantage of on-site level gauges is their simple installation, no need for remote signal transmission, and ease of operation and maintenance. It should be noted, however, that the readings from on-site level gauges may be affected by on-site environmental conditions such as temperature and vibration, resulting in certain inaccuracies. The advantage of remote level gauges is that they enable remote signal transmission and monitoring, allowing for real-time tracking of the liquid level inside the tank. However, care must be taken during the installation and commissioning of remote level gauges to ensure that the transmitted signals are stable and reliable, thereby preventing any errors. Regarding the error issues that occurred previously with glass tube and magnetic flap level gauges, there are many possible causes, such as equipment aging, inaccurate installation, and poor maintenance. Your understanding is correct; glass tube level gauges may show a higher liquid level due to liquid being fed from above, while magnetic flap level gauges may exhibit errors as a result of other factors. In summary, selecting the appropriate level gauge requires considering the actual conditions and requirements, and attention must be paid to details during installation and maintenance to ensure accuracy and reliability. .
A magnetostrictive level gauge should be a good choice.
For level measurement, an RF admittance level gauge can be considered, but it’s important to get a genuine one.
Regardless of whether glass plates or magnetic flip disks are used for installing the level gauge, the upper and lower flanges must be located below the liquid level; this ensures that the two types of media can communicate with the main body of the equipment, thereby creating a channel for medium exchange. The interface resulting from this exchange should, in theory, not deviate much from that within the equipment. Other factors contributing to this difference are the diameter and extension length of the flanged pipe; a smaller diameter and a longer length are unfavorable for the flow of the medium.
For magnetic flap level gauges, check whether the interface exceeds the upper flange, and whether the upper flange is connected to the upper part of the tank. If the panel is working properly, you can check the float. If it is a sealed tank that needs to be measured, a differential pressure transmitter can be considered.
For the application scenario you mentioned, I recommend installing a reliable piezoresistive level gauge on-site. Since the piezoresistive level gauge determines the liquid level by measuring the pressure changes caused by the liquid level, it offers advantages such as fast response, high accuracy, and immunity to external environmental influences. At the same time, since the media in your storage tanks are diesel and NPM solvent, both of which have low viscosity, they will not have an adverse effect on the piezoresistive level gauge. For remote transmitted level gauges, since they need to accurately measure the liquid level and transmit the data, it is necessary to take into account the effects of the surrounding environment and conditions, such as noise, interference, temperature changes, and so on. Taking these factors into account, it is recommended that you choose a microwave detector with high stability, high sensitivity, and high reliability. This type of level gauge can detect level changes quickly and accurately, and operate stably over a certain distance.