Influence of temperature on vortex flowmeter and solutions

Abstract: The influence of temperature on the vortex flowmeter and the solution information are provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. The engineer of Huaian Huali Instrument Co., Ltd. summarized the measurement error and treatment method of the vortex flowmeter according to the customer's use of the vortex flowmeter. You can roughly solve the reasons for the measurement error of the vortex flowmeter through our introduction. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the impact of temperature on vortex flowmeters and solutions. The engineers of Huai'an Huali Instrument have more information on the use of the vortex flowmeter of the customer, and have summarized the measurement error and treatment method of the vortex flowmeter. You can roughly solve the reasons for the measurement error of the vortex flowmeter through our introduction, so as to better use the vortex flowmeter. To analyze the cause of the error, we need to understand the composition of the flowmeter measurement system. It consists of a primary device, a secondary device and its accessories. Then the defects in manufacturing, unreasonable installation, poor debugging, wrong data setting, working conditions exceeding the allowable range, wear, scaling, blockage caused by long-term operation, and untimely and in-place maintenance will all cause measurement errors to increase. big. Of course, this is not limited to vortex flowmeters, but also causes errors in other flowmeters. Today we analyze the influence of fluid temperature change on the vortex flowmeter: 1. The reason why the fluid temperature change affects the flow coefficient of the vortex flowmeter. After the fluid temperature changes, its density changes accordingly. And the mass flow measurement of the velocity flow meter brings errors, which can be solved by density compensation. In addition to this, changes in fluid temperature also cause changes in the geometry of the measuring part of the flowmeter, and thus cause errors. The geometric size change of metal materials caused by temperature is generally 10 to the -5th power to the -1 power of C. When the vortex flowmeter is used to measure the steam flow, if the temperature change is relatively large, the impact will be considerable. Temperature compensation is generally required. 2. The flow coefficient is affected by the fluid temperature and consists of two parts: the change in the width of the body and the change in the inner diameter of the pipe. Why do you say that. The frequency of the Karman vortex is inversely proportional to the generating body. When the fluid temperature increases, the generating body increases, and the frequency decreases in inverse proportion, so the indication value is low; the flow coefficient is inversely proportional to the inner diameter of the pipe, and after the fluid temperature increases , the inner diameter of the pipeline increases, the flow cross-sectional area on both sides of the generating body increases, the flow coefficient decreases accordingly, and the flow indication value is low. The HL vortex flowmeter can automatically correct the flow coefficient according to the medium temperature input by the user. 3. Recalculate Kt (Kt is the flow coefficient when the fluid temperature is t). The actual temperature of the fluid used is often significantly different from the expected fluid temperature during design. For example, some heating networks have steam meters for all users when they are designed. All calculations are based on the superheated steam at t=280℃. After the system is put into operation, it is found that one-third of the user steam far away from the heat source plant has entered a saturated state. 170°C meter, then the error caused by the temperature change is calculated as:δ=(Ktd－Kt)/Kt=(0.9872535Km－0.992544Km)/0.992544Km=﹣0.53%, where Ktd is the flow coefficient calculated according to the design conditions, P/L; Kt is the flow coefficient calculated according to the actual temperature, P/L, obviously, the error introduced by this is considerable. Then the solution to this problem is to recalculate the flow coefficient according to the actual temperature of the fluid. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The influence of temperature on the vortex flowmeter and the solution'

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