Electromagnetic flowmeter is an indispensable flow measuring instrument for the current industry. It is not affected by external factors such as temperature, pressure and viscosity. It has no pressure loss and is durable. It is very popular in the industry. So what are the factors that must be considered when choosing an electromagnetic flowmeter?
First, the function of the electromagnetic flowmeter:
The basic functions of the electromagnetic flowmeter on the domestic market are roughly the same, but the electromagnetic flowmeter with better quality and better function can make it more reliable, simple, stable and powerful in practical use. In the function of purchasing electromagnetic flowmeters, you should choose according to your actual application, such as whether you have a remote signal output, whether it is explosion-proof, etc., choose a suitable electromagnetic flowmeter manufacturer, choose a suitable electromagnetic flowmeter.
Second, the electromagnetic flowmeter accuracy grade:
The accuracy of the electromagnetic flowmeter on the market is roughly in the range of (±0.5%~±1%)R and (±1.5%～±2.5%)FS. The accurate measurement results of the high precision electromagnetic flowmeter, the relative price It will be higher.
Third, liquid conductivity
The measured medium must be electrically conductive and should not be below the threshold. If the conductivity is lower than the threshold, measurement errors will occur and even the electromagnetic flowmeter will not be used. Even if the threshold is exceeded, it can be measured. The indication error does not change much. The general-purpose threshold is 10-4~(5×10-6)S/ Between cm, depending on the model.
It also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The length of the signal line corresponding to the conductivity is usually specified in the manufacturer's instruction manual.
Fourth, flow rate, full flow, range and caliber:
The diameter of the electromagnetic flowmeter does not have to be the same as the diameter of the pipe. It is also necessary to consider whether the flow meets the best measurement state according to the actual situation. The process industry transports liquids with different viscosities such as water. The flow rate of the pipeline is generally 1.5 to 3 m/s. In such a pipe, the diameter of the sensor is the same as the diameter of the pipe. The upper limit flow rate is not limited in principle, but it is generally recommended not to exceed 5 m/s unless the lining material can withstand scouring, and practical applications rarely exceed 7 m/s, and more than 10 m/s is even more rare.
It is used for fluids with easy adhesion, deposition, scaling and other materials. The flow rate is not less than 2m/s, preferably increased to 3-4m/s or above, which can be used for self-cleaning and adhesion prevention. For fluids with high abrasiveness such as pulp, the flow rate should be less than 2~3m/s to reduce the wear on the lining and the electrode. In the measurement of low-conductivity liquid close to the threshold (ie, the lower limit), the lower flow rate (less than 0.5 to 1 m/s) is selected as much as possible, and the flow noise is increased due to the flow rate increase, and the output sloshing occurs.
Choosing to buy a good electromagnetic flowmeter is very important in the production process. If you are uncomfortable, if you accidentally buy a quality that is not too hard, the result has not been used for half a month. The service is still very good, and it has been handled by you immediately. As a result, there has been a problem with the month. Such products have too much impact on work efficiency. Although people nowadays often say that after-sales service is better, the basis of this after-sales service is that the quality of the product should be excellent, and only in this way can the use efficiency be maximized.
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