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Detailed explanation of installation requirements and methods for several common flow meters
Flow meters are essential instruments for measuring the flow rate of liquids and gases, and we have probably seen many different types of flow meters
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A flow meter is an essential instrument for measuring the flow rate of liquids and gases, and I believe everyone has seen many different types of flow meters in their daily lives. The correct installation method is crucial for flow meters. Today, we will introduce several common installation requirements for flow meters.
Firstly, let's introduce electromagnetic flow meters. As instrument professionals, readers must have seen electromagnetic flow meters in many occasions.
The measurement principle of electromagnetic flowmeter does not depend on the characteristics of flow rate. If there is a certain turbulence and vortex generated in the non measurement area of the pipeline, it is irrelevant to the measurement.
A、 The installation site should not have large vibration sources and reinforcement measures should be taken to stabilize the pipelines near the instrument;
B、 Cannot be installed near large transformers, motors, pumps, and other equipment that generate large magnetic fields to avoid interference from electromagnetic fields;
C、 When connecting sensors to pipelines, full pipe operation should be ensured, and it is best to install them vertically;
D、 The transmitter housing, shielded cable, measuring body, and pipelines at both ends should be grounded, and the grounding electrode should be set separately. The grounding resistance should be less than 10 ohms and cannot be connected to the electrical or public grounding network;
E、 Require a straight pipe section with a diameter of the first 5 times and then 3 times the diameter of the pipeline.
If there is a steady-state vortex in the measurement area, it will affect the stability and accuracy of the measurement. In this case, the length of the front and rear straight pipe sections can be increased, a flow stabilizer can be used, or the cross-section of the measurement point can be reduced to stabilize the flow velocity distribution.
The flowmeter can be installed horizontally and vertically, but it should be ensured to avoid the influence of sediment and bubbles on the measuring electrode, and the electrode axis should be kept horizontal. When installed vertically, the fluid should flow from bottom to top.
Reasons for grounding electromagnetic flowmeter:The measuring electrode inside the electromagnetic flowmeter is in a direct current or alternating current electric field, and if its environment cannot be effectively shielded under interference free conditions, it can cause serious interference to the measurement.
The grounding of the sensor housing directly affects the accuracy and stability of the measurement. The grounding wire must not transmit any interference voltage. Therefore, electromagnetic flow meters require very reliable grounding and proper grounding shielding, otherwise interference currents will be generated.
However, the benefits of grounding electromagnetic flow meters are that if the pipeline connecting the sewage flow meter is insulated (relative to the measured medium), a grounding ring should be used, and its material should be selected according to the corrosiveness of the measured medium.
If it is a sensor made of polytetrafluoroethylene, in order to protect the flange of polytetrafluoroethylene from damage, a grounding ring should be selected.
Ultrasonic flowmeter is also a common flowmeter, and its installation is the simplest and most convenient among all flowmeters. Just select a suitable measurement point, input the pipeline parameters at the measurement point into the flowmeter, and then fix the probe on the pipeline.
The installation of ultrasonic flowmeter mainly follows the following three points:
1. Choose a pipe section filled with fluid that is uniformly dense and easy to transmit ultrasonic waves, such as a vertical or horizontal pipe section.
2. The installation distance should be selected as a uniform straight pipe section with no valves, elbows, or reducers within 10 times the diameter of the straight pipe upstream and 5 times the diameter of the straight pipe downstream. The installation point should be sufficiently far away from interference sources such as valves, pumps, high-voltage electricity, and frequency converters.
3. Avoid installation at the highest point of the pipeline system or on vertical pipelines with free outlets.
4. For open or semi full pipes, flow meters should be installed at U-shaped pipe sections.
The main installation requirements for vortex flow meters are for straight pipe sections, and there should be longer straight pipe sections on the upstream and downstream sides of the vortex flow sensor.
For vortex flowmeters, when measuring gas flow, if the measured gas contains a small amount of liquid, the flowmeter should be installed at a higher point in the pipeline.
When measuring liquids, if the measured liquid contains a small amount of gas, the flow meter should be installed at a lower part of the pipeline.
When installing a turbine flowmeter, attention should be paid to staying away from external electric and magnetic fields, and effective shielding measures should be taken if necessary to avoid external interference.
Turbine flow meters can be installed horizontally or vertically, and the fluid direction must be upward when installed vertically. The liquid should fill the pipeline without any bubbles.
During installation, the direction of liquid flow should be consistent with the direction indicated by the arrow on the sensor housing. During installation, the pipeline must be filled with fluid to ensure accurate measurement.
The upstream end of the flowmeter should have a straight pipe section at least 10 times the nominal diameter length, and the downstream end should have a straight pipe section at least 5 times the nominal diameter. The inner wall should be smooth and clean, without defects such as dents, scale, and peeling.
The axis of the sensor's pipeline should be aligned with the axis of the adjacent pipeline, and the gasket used for connecting and sealing should not penetrate deep into the interior of the pipeline.
At the same time, bubbles should be avoided during installation in the pipeline, otherwise it will affect the accuracy of measurement.
05 Velbar flowmeter
The Weiliba flow sensor is a flow sensor designed based on the differential pressure working principle and plug-in installation method.
Structural features: Scientific cross-sectional shape, unique anti clogging design, sensor surface roughness treatment, and anti clogging groove.
1. Basic installation method for horizontal pipelines
For horizontal pipelines, it is recommended to install within a range of 160 degrees above the pipeline when measuring gas, especially for gases with a large amount of water powder. We only recommend this installation method;
When measuring liquids, it is recommended to install them within a range of 160 degrees below the pipeline, especially for liquids containing a large amount of gas. We only recommend this installation method;
But one thing to note is that for liquids that are highly prone to gasification, such as liquid olefin media, the insertion direction should be the same as the gas when installing, above the pipeline.
When measuring steam, we only recommend installing the sensor within 160 degrees below the pipeline and placing it at the highest point of the entire measuring device.
For vertical pipelines, theoretically they can be installed within 360 degrees. For wet gases containing a large amount of moisture, it is recommended to tilt the sensor upwards by 5 degrees during installation
conclusion
Through the introduction of the flow meters mentioned above, the installation methods of flow meters under common working conditions are already quite clear. For the installation of flow meters under complex working conditions, specific analysis is needed. Accumulating rich experience is the most important step in solving problems.
Firstly, let's introduce electromagnetic flow meters. As instrument professionals, readers must have seen electromagnetic flow meters in many occasions.
The measurement principle of electromagnetic flowmeter does not depend on the characteristics of flow rate. If there is a certain turbulence and vortex generated in the non measurement area of the pipeline, it is irrelevant to the measurement.
A、 The installation site should not have large vibration sources and reinforcement measures should be taken to stabilize the pipelines near the instrument;
B、 Cannot be installed near large transformers, motors, pumps, and other equipment that generate large magnetic fields to avoid interference from electromagnetic fields;
C、 When connecting sensors to pipelines, full pipe operation should be ensured, and it is best to install them vertically;
D、 The transmitter housing, shielded cable, measuring body, and pipelines at both ends should be grounded, and the grounding electrode should be set separately. The grounding resistance should be less than 10 ohms and cannot be connected to the electrical or public grounding network;
E、 Require a straight pipe section with a diameter of the first 5 times and then 3 times the diameter of the pipeline.
If there is a steady-state vortex in the measurement area, it will affect the stability and accuracy of the measurement. In this case, the length of the front and rear straight pipe sections can be increased, a flow stabilizer can be used, or the cross-section of the measurement point can be reduced to stabilize the flow velocity distribution.
The flowmeter can be installed horizontally and vertically, but it should be ensured to avoid the influence of sediment and bubbles on the measuring electrode, and the electrode axis should be kept horizontal. When installed vertically, the fluid should flow from bottom to top.
Reasons for grounding electromagnetic flowmeter:The measuring electrode inside the electromagnetic flowmeter is in a direct current or alternating current electric field, and if its environment cannot be effectively shielded under interference free conditions, it can cause serious interference to the measurement.
The grounding of the sensor housing directly affects the accuracy and stability of the measurement. The grounding wire must not transmit any interference voltage. Therefore, electromagnetic flow meters require very reliable grounding and proper grounding shielding, otherwise interference currents will be generated.
However, the benefits of grounding electromagnetic flow meters are that if the pipeline connecting the sewage flow meter is insulated (relative to the measured medium), a grounding ring should be used, and its material should be selected according to the corrosiveness of the measured medium.
If it is a sensor made of polytetrafluoroethylene, in order to protect the flange of polytetrafluoroethylene from damage, a grounding ring should be selected.
Ultrasonic flowmeter is also a common flowmeter, and its installation is the simplest and most convenient among all flowmeters. Just select a suitable measurement point, input the pipeline parameters at the measurement point into the flowmeter, and then fix the probe on the pipeline.
The installation of ultrasonic flowmeter mainly follows the following three points:
1. Choose a pipe section filled with fluid that is uniformly dense and easy to transmit ultrasonic waves, such as a vertical or horizontal pipe section.
2. The installation distance should be selected as a uniform straight pipe section with no valves, elbows, or reducers within 10 times the diameter of the straight pipe upstream and 5 times the diameter of the straight pipe downstream. The installation point should be sufficiently far away from interference sources such as valves, pumps, high-voltage electricity, and frequency converters.
3. Avoid installation at the highest point of the pipeline system or on vertical pipelines with free outlets.
4. For open or semi full pipes, flow meters should be installed at U-shaped pipe sections.
The main installation requirements for vortex flow meters are for straight pipe sections, and there should be longer straight pipe sections on the upstream and downstream sides of the vortex flow sensor.
For vortex flowmeters, when measuring gas flow, if the measured gas contains a small amount of liquid, the flowmeter should be installed at a higher point in the pipeline.
When measuring liquids, if the measured liquid contains a small amount of gas, the flow meter should be installed at a lower part of the pipeline.
When installing a turbine flowmeter, attention should be paid to staying away from external electric and magnetic fields, and effective shielding measures should be taken if necessary to avoid external interference.
Turbine flow meters can be installed horizontally or vertically, and the fluid direction must be upward when installed vertically. The liquid should fill the pipeline without any bubbles.
During installation, the direction of liquid flow should be consistent with the direction indicated by the arrow on the sensor housing. During installation, the pipeline must be filled with fluid to ensure accurate measurement.
The upstream end of the flowmeter should have a straight pipe section at least 10 times the nominal diameter length, and the downstream end should have a straight pipe section at least 5 times the nominal diameter. The inner wall should be smooth and clean, without defects such as dents, scale, and peeling.
The axis of the sensor's pipeline should be aligned with the axis of the adjacent pipeline, and the gasket used for connecting and sealing should not penetrate deep into the interior of the pipeline.
At the same time, bubbles should be avoided during installation in the pipeline, otherwise it will affect the accuracy of measurement.
05 Velbar flowmeter
The Weiliba flow sensor is a flow sensor designed based on the differential pressure working principle and plug-in installation method.
Structural features: Scientific cross-sectional shape, unique anti clogging design, sensor surface roughness treatment, and anti clogging groove.
1. Basic installation method for horizontal pipelines
For horizontal pipelines, it is recommended to install within a range of 160 degrees above the pipeline when measuring gas, especially for gases with a large amount of water powder. We only recommend this installation method;
When measuring liquids, it is recommended to install them within a range of 160 degrees below the pipeline, especially for liquids containing a large amount of gas. We only recommend this installation method;
But one thing to note is that for liquids that are highly prone to gasification, such as liquid olefin media, the insertion direction should be the same as the gas when installing, above the pipeline.
When measuring steam, we only recommend installing the sensor within 160 degrees below the pipeline and placing it at the highest point of the entire measuring device.
For vertical pipelines, theoretically they can be installed within 360 degrees. For wet gases containing a large amount of moisture, it is recommended to tilt the sensor upwards by 5 degrees during installation
conclusion
Through the introduction of the flow meters mentioned above, the installation methods of flow meters under common working conditions are already quite clear. For the installation of flow meters under complex working conditions, specific analysis is needed. Accumulating rich experience is the most important step in solving problems.
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