Verification of Liquid Volumetric Flow Meters

Abstract: The verification information of liquid volumetric flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Positive displacement flowmeter, also known as fixed displacement flowmeter, referred to as PD flowmeter, is the most accurate type of flowmeter. It uses mechanical measuring elements to continuously divide the fluid into single known volume fractions, which are repeatedly filled and filled according to the measuring chamber. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the verification article of liquid volumetric flowmeters. Positive displacement flowmeter, also known as fixed displacement flowmeter, referred to as PD flowmeter, is the most accurate type of flowmeter. It uses a mechanical measuring element to continuously divide the fluid into a single known volume portion, and measures the total volume of the fluid based on the number of times the measuring chamber is repeatedly filled and discharged. The following introduces the method of calibrating liquid flowmeter using volume tube flow device. 1. Appearance requirements The flowmeter should have a good appearance. There should be a nameplate and a sealable mechanism. 2. The basic error and accuracy level of the flowmeter The basic error and accuracy level of the flowmeter are shown in Table 8-16. Table 8-16 Basic error and accuracy class Accuracy class 0.1 0.2 0.5 1.0 1.5 2.5 Basic error class 0.1% 0.2% 0.5% 1.0% 1.5% 2.5% 3. Repeatability of flowmeter The repeatability of each flow point of the flowmeter should be It should not exceed 1/3 of the basic error limit of the flowmeter. 4. Verification conditions (1) The volume tube device for calibrating the flowmeter should have a valid verification certificate, and its accuracy should be better than 1/3 of the basic error of the flowmeter to be tested. . (2) The flow range of the volume tube device should be able to cover the flow range of the flowmeter. (3) For the flowmeter with pulse output, it should be able to ensure that the absolute value of the relative error of the pulse count in one verification does not exceed 1/3 of the repeatability of the flowmeter. (4) For flowmeters with a level better than 0.5%, the medium pressure at the flowmeter should be measured. A pressure gauge can be installed near the inlet of the flowmeter. When the medium pressure in the volumetric tube installation is higher than the atmospheric pressure, the volumetric tube device should also be measured. pressure at the place. (5) Flow control valves are installed at the inlet and outlet of the volume pipe device, and the flow rate at the verification point can be adjusted at will and required to be kept stable. (6) When calibrating the flowmeter, when the vapor pressure of the test medium is higher than the atmospheric pressure, the device should be closed to ensure that the test medium is isolated from the atmosphere. (7) An air eliminator should be installed in front of the flow meter, so that the medium is filled with the test pipe, so that it does not contain gas, and the gas in the medium is separated and emptied. (8) When the density of the medium needs to be measured, a density meter with corresponding accuracy should be provided. Generally, a second-class standard density meter should be used. we always insist“Reputation based, quality guaranteed”Provide customers with a full range of services. So for you who need to buy instruments, we will definitely be the best choice. And we'll also provide you with all the meter-related information you need to know. So stay tuned. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Verification of Liquid Volumetric Flow Meters'

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