Orifice flowmeter is a device commonly used for fluid measurement, but it also has some disadvantages. The following are some disadvantages of common orifice flowmeters:

Pressure loss: Orifice flowmeters introduce resistance in the fluid, resulting in a pressure drop at the measuring point. This means that there is a loss of energy when the fluid passes through the orifice plate, and more pump energy may be required to maintain the normal operation of the system.

Limited accuracy: The accuracy of orifice flowmeters is relatively low, especially in the low flow range. For applications requiring high accuracy, other types of flowmeters may need to be considered.

Dependence on fluid characteristics: The performance of orifice flowmeters is affected by fluid characteristics such as temperature, viscosity, and density. In the case of large changes in fluid properties, more complex corrections may be required.

Not suitable for steam measurement: Orifice flowmeters can be problematic when measuring steam flow because the compressibility of steam and the gas state can lead to inaccurate measurements.

Long straight pipe section is required: The orifice flowmeter requires a certain length of straight pipe section before the fluid flows through the orifice to ensure that the flow state of the fluid flows through the orifice is stable. This can be a problem for some space-constrained applications.

Vulnerable to contamination: If the fluid contains solid particles or other contaminants, the orifice plate may be susceptible to clogging, affecting the accuracy and stability of the flow meter.

Although orifice flowmeters have some drawbacks, they are still one of the most commonly used flow measurement devices in many industrial applications, especially when they are relatively low cost, small in size, and easy to install and maintain. When choosing a flow meter, it is necessary to weigh the advantages and disadvantages of different types of flowmeters according to the requirements of the specific application.

Elliptic gear flowmeter is a device used to measure liquid flow, its principle is to measure the volume of fluid through the rotation of the elliptic gear. The following are the general requirements for the installation of elliptical gear flowmeters:

Installation location selection:
Ensure that the installation position is away from suspended solids, particles, or other substances in the liquid that may affect the normal rotation of the gear.
Avoid the presence of bubbles in the pipe, as bubbles may affect measurement accuracy.

Fluid flow conditions:
Ensure that the liquid has a stable flow condition at the inlet of the flow meter to avoid the impact of liquid turbulence on the measurement.

Straight pipe section:
There should be at least a straight pipe section of sufficient length before and after the flow meter to ensure that the flow state of the fluid through the gear flow meter is stable enough. It is usually recommended to install a straight pipe section of 10 times the diameter before and after the flow meter.

Pipe material:
The material of the flow meter should be matched with the pipe to ensure its performance and stability in the fluid.

Ambient temperature:
Ensure that the temperature range of the installation environment meets the operating requirements of the elliptical gear flowmeter. Some models of flowmeters may have special temperature requirements.

Calibrate:
Calibrate the flow meter after installation to ensure accuracy. The calibration cycle should be carried out according to the manufacturer's recommendation.

Regular maintenance:
Perform regular maintenance to ensure that the gear and mechanical components of the elliptical gear flow meter are in good condition and to remove dirt or deposits that may affect the measurement.

Avoid vibration and shock:
Avoid installing the flow meter in a position that may be subject to vibration or shock to prevent damage to the flow meter.

Electrical wiring:
Ensure that cables are securely connected to avoid electromagnetic interference.

Follow the manufacturer's recommendations:
Carefully read the installation manual of the elliptic gear flow meter and the relevant information provided by the manufacturer, and install it according to its recommendations.

During installation, it is best to follow the specific elliptic gear flowmeter model and the installation manual provided by the manufacturer. If you have special requirements or questions, it is recommended to consult the Aister flow meter manufacturer or relevant professionals.

Differential pressure flowmeter working principle

Differential pressure flowmeter is a kind of meter that measures the flow rate by measuring the pressure difference between the front and back of the throttle. It has a wide range of applicability and can be applied to a variety of fluid media and measurement scenarios. The following will introduce the working principle of differential pressure flowmeter, structural principle, performance characteristics, selection precautions, installation precautions, debugging and calibration, maintenance and maintenance and application areas in detail.

1, throttle principle
The throttle principle of the differential pressure flowmeter is based on the phenomenon of differential pressure when the fluid passes through the throttle. Due to the shape and size of the throttling part, the flow of the fluid is hindered, which slows down the flow rate and reduces the pressure. The pressure difference before and after the throttle can be measured to get the flow information

2, the structure principle
The structure principle of differential pressure flowmeter mainly includes three parts: throttle, pressure tube and differential pressure transmitter. The throttle part is used to generate the pressure difference, the pressure tube is used to collect the pressure before and after the throttle part, and the differential pressure transmitter is to convert the collected pressure signal into an electrical signal output

3, performance characteristics
Differential pressure flowmeter has the following performance characteristics:
(1) high measurement accuracy, good stability.
(2) simple structure, easy to maintain.
(3) wide range of application, can be used for the measurement of various fluid media.
(4) with high response speed and measurement accuracy.
(5) can be used for high temperature and high pressure environment measurement.

4, selection precautions
When choosing a differential pressure flow meter, note the following:
(1) according to the measurement needs to choose the appropriate throttling parts type and specifications.
(2) according to the fluid medium and measuring environment to choose the appropriate pressure tube and differential pressure transmitter.
(3) consider whether the flow meter's range, accuracy, response speed and other performance parameters meet the measurement needs.
(4) Consider whether the structure size and installation method of the flowmeter match the field environment.

5, installation precautions
Differential pressure flowmeter installation needs to pay attention to the following matters:
(1) the pipeline should be cleaned before installation to ensure that there are no impurities and pollutants inside the pipeline.
(2) Install the throttling parts correctly to ensure that the position and direction of the throttling parts are correct.
(3) Correctly install the pressure tube to ensure the tightness and correct position of the pressure tube.
(4) the installation site should avoid the influence of strong magnetic field and vibration source
(5) The flowmeter should be installed in a position that is easy to maintain and operate.

6. Debugging and calibration
Differential pressure flowmeters require debugging and calibration before use to ensure measurement accuracy and precision. The debugging includes checking the tightness of the pressure tube, checking the zero point and measuring range of the differential pressure transmitter, etc. The calibration includes the calibration and calibration of the flow meter to ensure that its measurement accuracy and precision meet the requirements.

7. Maintenance and maintenance
The differential pressure flowmeter needs regular maintenance and maintenance during use to ensure its normal operation and service life. The maintenance content includes regular inspection of the appearance, cleanliness and sealing of the pressure tube of the flowmeter; The maintenance content includes the flow meter lubrication, cleaning and other operations, as well as the replacement of damaged parts.

8. Application fields
Differential pressure flowmeters are widely used in the following fields:
(1) petrochemical: used to measure the flow of various oil products and chemicals.
(2) natural gas: used to measure the flow of natural gas and other gases.
(3) water treatment: used to measure the flow of various water quality.
(4) power industry: used to measure the flow of steam and water.
(5) food industry: used to measure the flow of various liquid foods.

Turbine flowmeter is very important for the work and production of the industrial industry, we should not only understand the structure, characteristics, parameters of the turbine flowmeter, but also understand more installation methods to ensure the accuracy of the turbine flowmeter measurement, then how to do the accurate measurement of the medium? Now let Aister Xiaobian take you to understand.

1. installation site: the flowmeter should be installed in a place that is easy to maintain, without strong electromagnetic interference and without thermal radiation. Flowmeter is generally installed indoors, must be installed outdoors, must use sunscreen, rain, lightning protection measures.

2. the requirements for installation and welding: Before installing the flow meter, the welding slag and other dirt in the pipeline should be strictly removed, and the pipe of equal diameter (or by-pass pipe) should be used to replace the flow meter for purging the pipe. To ensure that the flow meter is not damaged during use.

3. the requirements for the straight pipe section: the flowmeter must be installed horizontally on the pipeline, the axis of the flowmeter should be concentric with the pipeline axis when installed, and the flow direction should be consistent. The length of the upstream pipe of the flow meter should be not less than 2DN of the equal straight pipe section, if the installation site allows it is recommended that the upstream straight pipe section is 20DN and the downstream is 5DN.

4. the requirements for piping: the inner diameter of the upstream and downstream piping at the installation point of the flowmeter is the same as the inner diameter of the flowmeter.

5. Requirements for bypass pipes: cut off valves (stop valves) should be installed on the front and back pipes of the flow meter, and bypass pipes should be set up. The flow control valve should be installed in the downstream of the flow meter, and the stop valve installed in the upstream when the flow meter is used must be fully opened to avoid the instability of the fluid in the upstream part.