Electromagnetic flowmeter and metering tank
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Intermittent feeding, 5–10% dilute hydrochloric acid, with a heating volume of about 1.5 cubic meters per batch. Two control schemes: 1. Measure with an electromagnetic flow meter; shut off the feed valve when the cumulative volume reaches 1.5 cubic meters. 2. Use a metering tank and a weight sensor to control the feed valve via weighing. Which of these two solutions has better control accuracy? Which has better economic efficiency for investment? Compared to electromagnetic flowmeters, which one has a lower failure rate: the weighing module or?
Haha, of course it’s the weighing module that has a low failure rate!
The advantage of flowmeters is their versatility. From a maintenance perspective, the failure rate of all components other than the flowmeter itself is very low. The key issue is whether the flowmeter is suitable for the medium being handled (corrosion, wear, etc.). If a particular flowmeter is not appropriate, it may be necessary to consider using another one； Weighing equipment is specialized machinery; in theory, the error per weighing is smaller than the cumulative measurement error of flow meters. However, in practice, factors related to the devices connecting the tank (hoses, brackets, various accessories, etc.) have a significant impact on the measurement process, which can lead to considerable errors. For example, if the tank touches against some object, this can result in inaccurate measurements, and by the time you check it, the cause may have already been removed, leaving you confused after all that effort. So it is best to make the choice based on the on-site management level. The above assumes that product quality is high; in reality, both flowmeters and weighing instruments have issues related to quality and after-sales service.
I’m not sure whether you want to increase the volume or the mass. The flow meter measures volume, at 1.5 m³, while the weighing module measures mass, not m³. A flow meter will meet your requirements; don’t use domestic ones – opt for a better quality one that costs a little over ten thousand.
Each has its advantages and disadvantages; electromagnetic flowmeters are relatively cost-effective, while metering tanks require a higher investment – in addition to the tank itself, an air supply and exhaust system as well as safety accessories are needed.
The control accuracy is roughly the same; the service life and cost depend on the model chosen. However, the use of weighing systems increases the cost of process equipment. Weight control has advantages such as being unaffected by the state of the medium. It also has the drawback of being susceptible to external environmental influences (such as objects being deliberately placed on the measuring tank, aging of connection hoses, etc.). Moreover, the use of weighing instruments is limited, and the technical expertise required for their maintenance is relatively low; therefore, it’s better not to use them.