Wastewater flowmeter is one of the more difficult instruments to use, and its selection is also difficult because of the strong corrosiveness and disorder of the objects it measures, and because of its wide variety, such as electromagnetic flowmeters and throttle flowmeters Other wastewater flowmeters, as well as integrated wastewater flowmeters and split wastewater flowmeters, then we should pay attention to the following aspects when choosing?
1. Have a good understanding of wastewater
Before purchasing a wastewater flowmeter, we need to know what type of factory wastewater it is. Generally, there are industrial wastewater (such as: power plants, steel plants, chemical plants, paper mills) and domestic wastewater, etc. Different wastewaters are suitable for different wastewaters. Flow meters, such as paper mill wastewater flow meters. At the same time, it is necessary to have a full, detailed and comprehensive understanding of the components in the sewage, so as to correctly select the lining material and electrode material of the wastewater flowmeter. For example, the size of the corrosiveness of wastewater, the amount of particles and debris it contains. If we do not know much about the composition of wastewater, we can understand the corrosiveness of wastewater by analyzing the material of the wastewater pipeline. Then select the anti-corrosion type wastewater flowmeter according to the degree of corrosiveness.
2. Fully understand the installation conditions
The site environment in which the wastewater flowmeter is to be installed also directly affects the choice of the wastewater flowmeter. It is also necessary to fully understand the straight pipe section in front and the on-site interference situation. Because different wastewater flow meters have different environmental requirements. For example, the installation of electromagnetic flowmeter requires a certain straight pipe section (5D) in front of it, requires no strong interference signal on site, and the site temperature and humidity also need to meet certain requirements.
3. Understand the performance of the flowmeter
When choosing a flowmeter, it is necessary to understand the performance of various flowmeters, and to be familiar with the accuracy, repeatability, linearity, turndown ratio, output signal characteristics and other factors of the wastewater flowmeter. It is also necessary to understand the diameter of the waste water pipeline, because the requirements of different flow meters are different. For example, each caliber of the electromagnetic flowmeter has certain requirements on the lower limit of the flow. When the flow is too small, the measurement accuracy will not match the actual. When the flow is too small, we generally meet the measurement requirements of the wastewater flowmeter by shrinking the pipeline.
The flow rate of wastewater varies greatly, and the composition of wastewater is not easy to measure. It contains not only various impurities, but also various elements. Wastewater is also somewhat conductive and corrosive. This has very strict requirements on the various performances of wastewater flowmeters, so we should adjust measures to local conditions and fully investigate the environment and wastewater in order to choose the most suitable wastewater flowmeter.