Electromagnetic flowmeter grounding problem

Notes in the use of electromagnetic flow:

1, because the induction signal voltage of the electromagnetic flowmeter is very small, it is easy to be affected by noise. The reference potential must be the same as the liquid being measured. The correct grounding of electromagnetic flowmeter is directly related to the accuracy and stability of measurement.

There are many things that need to be paid attention to in the installation of gas turbine flowmeter, such as: the need for good grounding, the need to install filters during installation and the requirements of the installation environment, etc. Only when we really understand its installation precautions, can we effectively ensure the measurement accuracy and service life of gas turbine flowmeter.

Vortex flowmeter common faults and solutions

Technical requirements and precautions for measuring natural gas with precession vortex flow meter

Vortex flowmeter is a new flowmeter successfully developed on the basis of Karman vortex principle. Vortex flowmeter is suitable for measuring the mass flow and volume flow of superheated steam, saturated steam, compressed air, general gas, water and low corrosive liquid. How to ensure the accuracy of vortex flowmeter measurement during installation?

There are often some error factors in the calibration and use of flowmeter coefficient, which affect the accuracy of gas metering. The following are the factors that affect the accuracy of the steam flowmeter.

As a very special medium, steam will show special phenomena and problems in the process of vortex flowmeter measurement. The key problem is that the vapor density value deviates too much from the design value, which brings significant measurement errors to the measurement results. At present, the mature density measuring instrument has not been successfully applied, which brings certain difficulties to the steam flow measurement.

The vortex flowmeter has a flow meter in the pipeline without output. The reasons for this failure and the corresponding solutions are as follows:

1. After power-on, there is fluid flow in the pipeline, but the vortex flowmeter has no signal output

Vortex flowmeter is widely used because of its wide range, small pressure loss, medium accuracy, linear output, no moving parts, high reliability, small maintenance, medium low price, and relatively high performance price characteristics.

Vortex flowmeter is a velocity flowmeter, which measures the volume flow rate in the working state. If you choose the table according to the volume flow rate, the mass flow rate provided by the customer should be converted into the volume flow rate under the working state, and then determine the diameter of the selected instrument against the volume flow parameter.

1, pulse vortex flowmeter is a kind of high measurement accuracy, simple installation, small maintenance, a wide range of meters, is currently widely used in petrochemical, metallurgy, textile, urban construction, energy and other industries.

As a very special medium, steam will show special phenomena and problems in the process of vortex flowmeter measurement. The key problem is that the vapor density value deviates too much from the design value, which brings significant measurement errors to the measurement results. At present, the density measuring instrument with mature technology has not been successfully applied, which brings certain difficulties to the steam flow measurement.

Vortex flowmeter is a kind of instrument device to measure the flow of pipeline fluid, and it works by the principle of velocity vortex. Vortex flowmeter has two kinds of volume and mass flow measurement, which can be selected according to the situation of the field.

The structure of the vortex flowmeter is relatively simple, only the sensor and the display instrument are composed of two parts, and the measurement accuracy and stability are also relatively stable.

Vortex flowmeter is mainly used for the flow measurement of industrial pipeline medium fluids, such as gas, liquid, steam and other media. There are special phenomena and problems in the process of measurement. One of the key problems is that the vapor density value deviates too much from the design value, which brings significant measurement errors to the measurement results. At present, the density measurement instrument with mature technology has not been successfully applied, which brings certain difficulties to the steam flow measurement.

The working principle of vortex flowmeter is to place a non-streamlined vortex generator in the fluid, so that the fluid is alternately separated on both sides of the generator, releasing two series of regularly staggered vortex flowmeter. In a certain range, the vortex separation frequency is proportional to the flow rate, and the flow rate of the medium can be measured by calculating the vortex separation frequency.

The insertion vortex flowmeter is mainly used for the flow measurement of large-diameter gas, liquid and steam medium in industrial pipelines. In order to ensure the accuracy of its measurement, the following points should be noted when installing:

The split vortex flowmeter is a kind of flowmeter suitable for measuring steam at high temperature, which can avoid the influence of interfering signals on the measurement of the instrument. So what are the characteristics of the split vortex flowmeter?

1. There is fluid flow in the pipeline after power-on, but no signal output

With the continuous production progress of the reform and opening up industry, it has been applied in more and more industries, and the vortex flowmeter is widely used in large, medium and small pipeline water supply and drainage, industrial circulation, and sewage treatment.

Due to the compressibility of the gas, its flow measurement is more complex than that of the liquid, and the output signal of the vortex flowmeter is related to the gas density in addition to the input signal, and the density of the gas is a function of temperature and pressure (referred to as temperature and pressure).

Vortex flowmeter has high requirements for installation and working environment, and the front and rear straight pipe sections must be installed in accordance with the specifications.

Vortex flowmeter is a velocity flowmeter, which measures the volume flow rate in the working state.

Compressed air is generated by air compressor or high pressure fan. When these devices are in operation, they all have varying degrees of vibration, and sometimes the vibration is relatively strong, and this vibration is transmitted through the connecting pipe.

At present, many users often think that the purchase of a high-price flow meter can get accurate measurement results. The measurement of steam is different from other fluids such as water, air and other media, and there are many factors affecting its measurement in the actual measurement.

In the selection process of the vortex flow meter, in addition to the selection of a high-precision type in a comprehensive consideration of the demand, other accessories of the vortex flow meter are also very important, such as the selection of flow transmitters, the selection of compensatory pressure transmitters, and so on.

The vapor flowmeter has no moving parts, strong reliability, high precision, long life, and can measure the instantaneous flow and cumulative flow of liquid in a wide flow range.

Vortex flowmeter is used to generate stable vortices when the fluid flows through the obstruction, and the flow measurement is achieved by measuring the frequency of the vortices. Vortex flowmeter is composed of vortex flow sensor and flow display instrument. The display instrument is a general flow display instrument. The following introduces the installation points of steam flowmeter.