Briefly describe the comprehensive inspection contents of BURKERT flowmeter
The basic law of the influence of BURKERT flowmeter readings, and using glycerol aqueous solution as the working medium, a unified correction formula for three types of domestic LZB, 10, and 6 rotor flowmeters was obtained on a flow standard device. The research results indicate that the theoretical research and experimental results of the instruments tested are basically consistent, and the maximum deviation between the unified correction formula and the experimental values is 3.3%.
BURKERT flowmeter is widely used in industry and scientific research due to its simple structure, low cost, easy use, and wide range. However, the use of rotor flowmeter, like other flowmeters, encounters the problem of inconsistent viscosity between the calibration medium and the medium used How to correct the scale of a rotor flowmeter obtained using a calibration medium under calibration conditions when the viscosity of the working medium is different from that of the calibration medium under actual working conditions Many scholars have conducted research on this issue These studies can be divided into two categories in terms of methodology. One category focuses on the design of new floats that minimize the influence of viscosity, in order to avoid indication correction caused by the difference in viscosity between the calibration medium and the working medium; Another type of research focuses on finding the viscosity correction curve of existing rotor flow meters through experiments, and obtaining the conversion relationship of flow rate under different viscous working media ["~6]
The above two methods have a certain promoting effect on the study of the viscosity effect of BURKERT flowmeter, but there are still certain problems from the current work By using * methods, a float with significantly reduced viscosity can be found. For example, the viscosity effect of a disc-shaped float is 25% of that of an old-fashioned float, but the weight of the disc-shaped float is small, so the range of the rotor flowmeter is also small and cannot be used in practice. In addition, although the viscosity effect of the disc-shaped float is reduced, the problem is that there is still a viscosity effect, so it is still necessary to seek correction of the viscosity effect Currently, most of the two methods use engine oil as the working medium and obtain experimental curves by changing viscosity through heating *By using the method of warming the engine oil, three parameters of the medium, namely temperature, viscosity, and density, are actually changed.
Among these three parameters that have an impact on the BURKERT flowmeter, the influence of density can be distinguished; However, the effects of temperature and viscosity intersect and are difficult to distinguish.
Therefore, the results obtained from these experiments are actually a combination of two factors, and cannot obtain the influence and correction of the single factor of medium viscosity on the indication of the rotor flowmeter One problem with the research on the two aspects mentioned above so far is that they are all experimental studies and there is a lack of theoretical research In view of the above situation, this article intends to apply the basic theory of fluid mechanics to analyze the motion of the rotor, derive the mathematical model of the rotor flowmeter, and thus obtain the theoretical curve of viscosity correction for the rotor flowmeter.
BURKERT flowmeter determines the volumetric flow rate under working conditions by measuring the velocity of conductive liquid. According to the measurement requirements, for liquid media, the mass flow rate should be measured, and the measurement of medium flow rate should involve the density of the fluid. Different fluid media have different densities and vary with temperature. If the electromagnetic flowmeter converter does not consider fluid density and only provides volumetric flow rate at room temperature, it is not appropriate.
The installation and debugging of BURKERT flow meters are more complex and require stricter requirements than other flow meters. The transmitter and converter must be used together, and two different types of instruments cannot be used between them. When installing the transmitter, it is necessary to strictly follow the requirements of the product manual from the selection of the installation location to the specific installation and debugging. The installation location should not have vibration or strong magnetic fields. During installation, it is necessary to ensure good contact and grounding between the transmitter and the pipeline. The potential of the transmitter is equal to the potential of the measured fluid. When using, it is necessary to exhaust the gas remaining in the measuring tube, otherwise it will cause significant measurement errors.
When the BURKERT flowmeter is used to measure viscous liquids with dirt, viscous substances or sediment adhere to the inner wall of the measuring tube or electrode, causing a change in the output potential of the transmitter and resulting in measurement errors. When the dirt on the electrode reaches a certain thickness, it may cause the instrument to be unable to measure.
In the experiment, different concentrations of glycerol were used as the medium and the experimental results were density corrected to obtain a viscosity correction formula for the rotor flowmeter based on theory and verified by experiments
BURKERT flowmeter is a surface used to measure the volumetric flow rate of conductive media. In order to ensure the measurement performance and stability of the electromagnetic flowmeter, it is necessary to conduct a comprehensive inspection of it at regular intervals. Next, let's talk about the specific content of the inspection.
1. The technical request for zero point viewing of BURKERT flowmeter is: the flow sensor measuring tube is filled with liquid and has no activity, and the zero point of the converter alone is generally negative and the value is also very small; If its value is greater than 5% of the full range, it is necessary to check first and make adjustments after confirming the reason.
2. The inspection content of BURKERT flowmeter is to check the conductivity and insulation resistance of each core of the signal line and excitation line, and to check whether the grounding of each shielding layer is intact.
3. The viewing content of BURKERT flowmeter is to replace the sensor with a simulated signaler that matches the universal surface and flowmeter type to supply flow signal, stop zeroing and calibration. Calibration includes zero point viewing and adjustment, set value viewing, excitation current measurement, current/frequency output viewing, etc.
4. The BURKERT flowmeter measures the resistance of the excitation coil and the electrode contact resistance to evaluate the surface contamination of the electrode and the condition of the fabric adhesion layer; Check the insulation resistance of each part to determine the level of component degradation, and estimate the changes in flow values caused by changes in the active area before and after cleaning the adhesive layer.
The above is the specific content of a comprehensive inspection of electromagnetic flow meters. If you want to learn more about flow meters, please feel free to visit our factory for inquiries or contact us directly.