Flowmeter lectotype of the three steps are as follows: 1.

On the basis of fluid types and five aspects to consider factors available instrument types (primary
To have several types for selection)
;
2.

The primary types and price information collection, data for further analysis and comparison of the preparation conditions;
3.

Elimination method is used to gradually concentrated to 1 ~ 2 types, to comparative analysis of the final repeatedly to five factors determine the primary target.

For we need to know we will offer you at the first time.

Because this is the most suitable not only for the product, is the most convenient for the user.

So for the flowmeter selection of subsequent demand please continue to pay attention to our friends.
At the same time we also welcome you the presence!

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Pressure loss of the electromagnetic flowmeter has no resistance, no advantage, can reduce the resistance of the pipe fully, accord with the requirement of saving energy and reducing consumption, and electromagnetic flowmeter are received considerable attention in the industry.

But though electromagnetic flowmeter has the advantages, and in terms of reliability and stability are much better than most other types of flow meter, but in the process of actual use, or will happen some problems, listed below small make up for all the electromagnetic flowmeter in engineering applications need to be aware of the point.

1 ▶ ▶ ▶ transmitter to choose at any time the location of the measurement can be filled with a liquid intraductal for installation, in order to prevent the result of the measurement of intraductal no liquid illusion caused by pointer is not zero.

* is a vertical installation, reduce the liquid flow through the error caused by bubbles on the electrode.

If placed, the flow meter of two electrodes must be kept in the same horizontal plane, in order to prevent sediment or in the air to make it on the top of the pipe insulation.

02 ▶ ▶ ▶ if necessary, can let the empty tube, the built-in atc testing lines, stops and traffic signal output.

03 ▶ ▶ ▶ with anodic protection of flow of fluid in pipe, install the electromagnetic flow timing, should follow the following points: in order to allow fluid to good grounding, use ring;

Sensor connected with pipes, flanges should have insulation pad, also want to invest in use on the screw.

04 ▶ ▶ ▶ when the electromagnetic flowmeter is grounded in the installation of the metal tube road, through the electromagnetic flow meter transducer on the earthing terminal to realize the potential balance system, namely through the cross-sectional area of not less than 6 was copper wire connected to the earthing terminal;

When electromagnetic flow meter installed in the grounding of metal pipe, the two flange through a cross-sectional area for at least six was the copper wire connected to pipe flange, and grounding;

The transmitter or sensor junction box are connected to the earthing terminal, achieve the equilibrium of the system potential,

When electromagnetic flow meter installed in plastic pipe or pipe insulation lining, through additional ground loop to realize the potential balance system, grounding ring by cross-sectional area for at least six of copper wire was connected to the earthing terminal.

05 ▶ ▶ ▶ electromagnetic flow meter should be installed in the indoor dry ventilated place, avoid installation where the ambient temperature is too high, should not be affected by a strong vibration, as far as possible to avoid a strong magnetic field equipment, such as motor, transformer, etc. , avoid installed in corrosive gases, installation location convenient for maintenance, this is to ensure the normal operation of the transmitter of environmental conditions.

06 ▶ ▶ ▶ in order to guarantee the electromagnetic flow meter measuring tube full of measured medium, getting good idea device * vertical installation, moving from bottom to top, especially for the liquid-solid two phase flow, must be installed vertically.

If only allow level field installation, it must ensure that the two electrodes in the same horizontal plane.

07 ▶ ▶ ▶ electromagnetic flow meter should be installed on both ends and the bypass valve.

08 ▶ ▶ ▶ electromagnetic flow meter electrode measured by several millivolt ac potential, is based on potential liquid in the transmitter.

In order to make the fluid potential and fluid to maintain stability and a transmitter, a measure to ensure the steady, shell and tube ends should have a good grounding in the transmitter, the converter shell can also, grounding resistance is not greater than 10 ohms, and cannot be Shared with other electrical equipment grounding line.

If cannot guarantee transmitter shell good contact with metal pipes, metal wires connect them up, and reliable grounding.

09 ▶ ▶ ▶ to avoid jamming signal, signal between the transmitter and transducer with shielding wire transfer, are not allowed to put the signal cable and power line parallel, within the same cable steel tube length of signal cable in general should not exceed 30 m.

10 ▶ ▶ ▶ converter installation location should avoid, ac and dc magnetic field and vibration environment temperature for -

20 ~ 50 ℃, and not contain corrosive gas, the relative humidity is not more than 80%.

11 ▶ ▶ ▶ in order to guarantee the normal operation of the electromagnetic flowmeter, reduce the measuring error, electromagnetic flowmeter should meet the requirements of straight pipe before and after.
According to JJG 1033 -

2007 verification regulation of electromagnetic flowmeter test standard requirements, usually 10 d, straight pipe should be met before a straight pipe should be after 5 d.
12 ▶ ▶ ▶ installation location.

Electromagnetic flow meter can be installed in a vertical, horizontal or vertical installation, but recommended and is the current body is flowing from bottom to top.

Also can be installed horizontally, but to make the two electrodes in the same horizontal plane.

Level when installation to ensure that when the measuring tube is filled with liquid.

In the head line is vertical line, under normal circumstances, the required flow is from bottom to top, try not to from top to bottom.
The latter is likely to cause flow fluctuation is larger.

Installed in addition to the full package, it is also important, followed by the distance of straight pipe before and after.
Choose easy maintenance, convenient place.

Meter should be installed in the pump back end, must not be installed on suction side, the valve should be installed in the flow downstream.

13 ▶ ▶ ▶ due to potential electromagnetic flowmeter measurement is weak, the need to eliminate all interference can be measured accurately, and good grounding is a necessary condition for ensuring the electromagnetic flowmeter work stable.

Grounding is usually by grounding rings or sensor in the reference electrode and piping system grounding connection.

14 ▶ ▶ ▶ flowmeter installation location to stay away from all the magnetic source (
Such as high-power motors, transformers, etc. )
。
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Abstract: The information on the method of improving the turndown ratio and ensuring the measurement accuracy of the orifice flowmeter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. With the development of microelectronics technology and sensor technology and the penetration of computer technology into instruments, the orifice flow measurement technology has made a leap, and its remarkable sign is that the accuracy of the differential pressure transmitter is greatly improved, from the previous 1..5 The level has been increased to the current level of 0..1. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the method of improving the turndown ratio of the orifice flowmeter to ensure the measurement accuracy. With the development of microelectronics technology and sensor technology and the penetration of computer technology into instruments, the orifice flow measurement technology has made a leap, and its remarkable sign is that the accuracy of the differential pressure transmitter is greatly improved, from the previous 1..5 The level has been raised to the current level of 0..1 or even 0..075; when the relative flow rate is lower than 30%, the differential pressure signal sent by the throttling device can also reach the measurement accuracy, which is beneficial to the expansion of the flow measurement range ratio. The second is the realization of intelligent flow measurement secondary instrument, not only the data processing capability and accuracy have been greatly improved, but more importantly, the non-linearity and scalability of the outflow coefficient that affects the range ratio expansion of the orifice throttling differential pressure flowmeter. The influence of the expansion coefficient is compensated, which creates sufficient conditions for the improvement of the measurement accuracy of the orifice flowmeter, so that the measured turndown ratio can reach 10..1. There are several measures that can improve the range ratio of the orifice flowmeter at this stage: 1. When the outflow coefficient C changes, the flow calculation formula needs to be corrected Flow totalizer. To achieve a wide range, it is necessary to modify the flow calculation formula due to the change of the outflow coefficient C. The modification method is to multiply the flow rate Q in the flow calculation formula by the correction coefficient K. 2. When the density.. is changed, the flow calculation formula needs to be corrected. When the density.. of the actual fluid is inconsistent with the design used, the change of.. will change the flow value Q, so the Q value should be multiplied by the correction coefficient K. .. is corrected. When the measured fluid is gas or steam, the correction of density .. is extremely important. K .. = ../..d where K .. is the density correction coefficient; .. is the density of the medium in the working state; ..d is the density of the medium in the design state (constant). .. can be found in the parameter table according to the actual temperature and pressure, or calculated according to the functional relationship (theoretical or empirical) of .. and temperature, pressure, relative humidity and other parameters. In the intelligent flow totalizer, the density table of water vapor has been loaded into the memory, and the value of .. can be accurately obtained by looking up the table. At present, intelligent flow totalizers such as WP series instruments of Shangrun Group have high-speed, high-precision computing functions and relatively large storage space, and can complete real-time compensation calculations for these complex intermediate parameters. 3. When the swellability coefficient.. is changed, the flow calculation formula needs to be corrected. When the actual fluid swellability coefficient.. is inconsistent with the one used in the design, the change of .. will change the flow value Q, so the Q value should be changed. It is corrected by multiplying it by the correction coefficient K c . K c = ../..d ( 5) In the formula, .. can be calculated from the formula (3); ..d is the expansion coefficient of the gas stream in the design state. In the specific operation, fill in .., ..P, P1 into the menu, and write them into the memory of the intelligent flow totalizer through the operation of the panel. . 4. Three expansion methods The following three methods can be used for expansion in the case of large turndown ratio. (1) Combine the large-flow segmented multi-channel parallel combination for measurement. In the occasions where the flow range changes greatly, the parallel combination of metering pipes of different pipe diameters is often used, and the change of the flow rate is adapted to the combination of the metering pipes. ( 2 ) Replace the orifice plate for measurement. Without changing the differential pressure flowmeter, the flow measurement can be achieved by changing the orifice plate with different opening diameters and changing the aperture ratio. This method is suitable for the situation that the seasonal flow rate changes greatly for a long time or the sudden change of the gas supply causes the differential pressure flowmeter to exceed the specified range of use. (3) Use an orifice flowmeter in parallel with differential pressure flowmeters of different ranges to measure. Using the primary device of the same orifice flowmeter, two or more differential pressure gauges with different ranges are connected in parallel for switching measurement. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Methods of orifice flow meter to improve turndown ratio to ensure measurement accuracy'
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Producing with varied technical skills, mass flow meter can be used in a wide range of applications as endress hauser ultrasonic flow meter.

Principle Structure The temperature sensor measures the temperature of the gas in the pipeline, and the other is a speed sensor. The electric heating conductance is higher than the temperature measured by the temperature sensor, and the temperature difference is kept constant. When the gas flow takes away the heat on the speed sensor, in order to keep the temperature difference constant, additional electric compensation heating is required, and the electric power of this compensation is proportional to the gas mass flow. In the above formula: Qm is the gas mass flow rate, K is the instrument coefficient (constant), △p is the compensated electric power (can be obtained by measurement), Cp is the specific heat capacity at constant pressure (determined by the gas composition); △t is the two probes The temperature difference between (constant): S is the cross-sectional area of ​​the pipe. Based on the above principles, for the flow measurement of large pipe diameter, although the corresponding large diameter calibration device is used to calibrate the flowmeter, it is only necessary to measure the corresponding mass flow rate on the standard diameter calibration device, and it can be conveniently measured. The mass flow rate of the fluid in the large bore. Both sensors are made of metal platinum material with stable performance, sealed in 316L stainless steel tube or special material tube resistant to acid and alkali corrosion through special process, so they are extremely strong and will not pollute the measured fluid or be affected by the measured fluid. Fluid contamination, and its corrosion resistance is very good. Pay attention to the mass flowmeter, which uses heat-sensitive measurement. The flow is measured by the molecular mass taken away by the split molecules. Because it uses heat-sensitive measurement, the measurement result will not be affected by changes in gas temperature and pressure. . Mass flowmeter is a relatively accurate, fast, reliable, efficient, stable and flexible flow measuring instrument, which will be widely used in petroleum processing, chemical industry and other fields, and it is believed that it will show great potential in promoting flow measurement. The mass flowmeter cannot control the flow, it can only detect the mass flow of liquid or gas, and output the flow value through analog voltage, current or serial communication. However, the mass flow controller is an instrument that can detect and control at the same time. In addition to the measurement part, the mass flow controller itself has an electromagnetic regulating valve or a piezoelectric valve, so that the mass flow control itself constitutes a closed-loop system for controlling the mass flow of the fluid. The setting value of the mass flow controller can be provided by analog voltage, analog current, or computer, PLC.
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Gas mass flow meters are suitable for precise measurement of gas mass. It converts the measured gas mass flow into the corresponding gas volume flow under standard conditions or gas mass flow under standard conditions. Gas mass flowmeter has the characteristics of high precision, long life, good repeatability, wide flow range, stable and reliable, etc. The method of testing gas quality to measure the flow of gas is currently in the leading position in China. Working principle The gas mass flowmeter is composed of a gas flow quality sensor and a digital display integrator. The gas mass flowmeter adopts the American Microbridge gas flow mass sensor and pressure sensor. The airflow quality sensor is based on the heat transfer principle that the heat taken away by the airflow quality flowing through the sensor is proportional to its output voltage. The pressure sensor is that the pressure of the gas is proportional to the output voltage, that is, the gas mass flow and gas pressure are simultaneously converted into analog signal output. The function of the digital display integrator is to convert the airflow quality analog electrical signal output by the airflow quality sensor into a digital signal through the A/D inside the single-chip microcomputer. After calculation and processing, the mass flow rate of the gas is converted into the corresponding volume flow rate under the standard state or the mass flow rate under the standard state. After data processing and calculation, the real-time flow and cumulative flow are calculated respectively, and sent to four-digit and eight-digit digital tubes for display. The digital display integrator can also convert the gas pressure analog electrical signal output by the pressure sensor into A/D through the single chip microcomputer, and send the gas pressure value to the three-digit digital tube for display. In addition, the single-chip microcomputer can store various constants and coefficients related to the calculation process, and the data information such as the upper and lower limits of the real-time flow and the pressure upper and lower limits set manually in the EEPROM of the single-chip microcomputer for permanent storage. The microcontroller can also store the accumulated flow value into the EEPROM memory. The above data information can be automatically saved after a power failure, and can be automatically restored after the power supply is restarted.
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