How to avoid magnetic field interference in gas turbine flowmeters?

Project Overview

The gas turbine flowmeter is an instrument that displays flow on site. When selecting it, it must be selected based on the parameters it measures. Special attention must be paid to the environment in which the gas turbine flowmeter is used. When the gas turbine flowmeter is used for a long time, it must be ensured that its corresponding humidity cannot exceed 90%. The flow range of the flowmeter must be used correspondingly with the diameter. Otherwise, it must be ensured that the straight pipe section is To solve this problem, shrink or expand the tube. According to the different installation specifications of the liquid gas turbine flowmeter, various methods such as threads, flanges and clamping can be used for connection during installation. When the liquid gas turbine flowmeter is installed vertically, the flow rate must flow from bottom to top. The liquid must fill the entire measuring pipe without the generation of bubbles. During installation, the direction of the flow of the measured liquid must also be ensured. It is consistent with the arrow indicated on the flow meter housing. There must be 20 times the straight pipe section in the upstream section of the gas turbine flowmeter, and no less than 5 times the straight pipe section downstream. The flowmeter should be installed away from external electromagnetic fields. When there is an electromagnetic field, it must be installed The corresponding bypass pipe is used to avoid magnetic field interference.

The gas turbine flowmeter passes through the valve in the pipeline. After confirming whether there is still flow in the pipeline, and then turning on the power of the flowmeter, it can be connected to the DC current setting of the multimeter, and it must be monitored at all times. For the output current of the flow meter, we then fine-tune the potentiometer on the converter circuit board to ensure that the output current remains at 4-20mA. When the gas turbine flow meter runs for a period of time in industrial measurement, the full-scale output of the flow meter The value cannot be debugged in on-site applications, but if debugging is necessary, the customer must return the flow meter to the factory, and then the manufacturer will calibrate it on a standard flow calibration device according to the customer's requirements. The internal parameters of the gas turbine flowmeter mainly include three menus, which are displayed on three screens in the flow meter. For this instrument parameter, it is a three-point coefficient correction within the measurement range of the instrument. The upper row displays the flow point frequency value. The lower row displays the flow point instrument coefficients. The three menus can be switched through the corresponding F keys. It is worth noting that the parameters of the flow instrument have been set before leaving the factory, and are not allowed to be changed without special circumstances.

When the accuracy and viscosity of the gas turbine flowmeter change, when the viscosity of the measured fluid changes, the accuracy and range of its measurement will have obvious changes. As the viscosity of the medium measured by the flowmeter becomes higher, its range will shrink, and the error phase will also move in the negative direction. Therefore, it is not suitable to use gas turbine flow meters in situations where the viscosity and temperature are relatively high. The error of the flow meter will change with the flow rate. Within the actual application range of the gas turbine flowmeter, it is necessary to avoid large errors in order to obtain better accuracy, so the measured range will be reduced. In the quantitative operation of liquid gas turbine flowmeter, the flowmeter operates in a very small flow range, and at this time it is necessary to obtain very high accuracy. gasFriction between the bearings of the turbine flowmeter and the shaft will cause wear and tear on the flowmeter, which will significantly change the accuracy of the flowmeter. Therefore, regular calibration is now required in trade settlement.