https://www.aoboinstrument.com/

Aobo Instrument, 4C Tower, North Side of Minzhu St. , West of Beihai Road , Hanting Dist, Weifang (2026)

14/08/2026

Why Is Vibration a Problem for Vortex Flow Meters?
Vortex flow meters are widely used for measuring steam, gases, and liquids, but one installation condition deserves particular attention: pipeline vibration.
The reason is closely related to how a vortex flow meter works.
When fluid passes through the bluff body inside the meter, alternating vortices are generated downstream. Within the normal operating range, the vortex shedding frequency is related to the flow velocity. The sensor detects these periodic pressure or force changes and converts their frequency into a flow signal.
The challenge is that mechanical vibration can also produce periodic signals.
Vibration from pumps, compressors, motors, or the pipeline itself may be transmitted to the vortex sensor. If the vibration signal falls within or near the meter's detection frequency range, it can interfere with the actual vortex signal.
This may result in several problems:
Flow indication even when the actual flow is very low or zero
Unstable or fluctuating readings
Poor measurement repeatability
Increased measurement error at low flow rates
The effect is often more noticeable at low flow, because the vortex signal itself becomes weaker. At this point, the difference between the useful flow signal and mechanical vibration interference becomes more difficult to distinguish.
Good installation practice is therefore important. The flow meter should be installed away from strong vibration sources whenever possible, the pipeline should be properly supported, and excessive mechanical vibration from pumps, compressors, or nearby equipment should be reduced.
However, some industrial sites cannot completely eliminate vibration. Steam pipelines, compressor systems, and heavy industrial processes are typical examples.
For these applications, AOBO offers anti-vibration vortex flow meters designed to improve signal recognition and measurement stability under vibration conditions. By reducing the influence of mechanical vibration on vortex signal detection, the meter is better suited for demanding industrial installations where conventional vortex meters may experience unstable readings.
Vibration does not necessarily mean that a vortex flow meter cannot be used—but it should always be considered during meter selection and installation.
A stable vortex signal starts with understanding both the flow and the vibration environment.

12/08/2026

Ultrasonic flowemter Back in service!
This ultrasonic flow meter returned to our factory for cleaning and maintenance — and is now ready for reinstallation at the customer’s site.
From maintenance to continued operation, we’re here to support every step.
FlowMeter Measurement Maintenance Sales Service Instrument

10/08/2026

What Happens If Air Enters an Electromagnetic Flow Meter?
Electromagnetic flow meters are designed to measure conductive liquids, not air.
When air enters the measuring tube, the electrical path between the liquid and the electrodes is interrupted. As a result, the transmitter may receive an incomplete or unstable signal.
Small amounts of dispersed bubbles usually have little influence on measurement. However, large air pockets or partially filled pipelines can lead to unstable readings, reduced accuracy, or even a zero-flow indication.
Air commonly enters the system due to:
Pump suction problems
Improper pipeline design
High-point installation
Empty tanks
Poor venting during startup
To reduce the influence of air, the flow meter should always be installed where the pipeline remains completely full under normal operating conditions.
Installing the meter at the lowest point of a horizontal pipeline or on an upward-flowing vertical pipeline can significantly improve measurement stability.
Proper installation often prevents measurement problems before they occur.
AOBO electromagnetic flow meters are designed to provide reliable performance, but maintaining a continuously full measuring tube remains one of the most important installation requirements.
A full pipe is essential for accurate electromagnetic flow measurement.

06/08/2026

Why Does My Electromagnetic Flow Meter Read Zero?
An electromagnetic flow meter displaying zero flow does not always indicate that the meter has failed. In many cases, the issue is related to the process conditions or installation rather than the instrument itself.
Since electromagnetic flow meters measure the voltage generated by a conductive liquid moving through a magnetic field, several conditions must be met before a valid flow signal can be produced.
One of the most common causes is an empty or partially filled pipe. If the measuring tube is not completely filled with liquid, the electrodes cannot detect a stable induced signal.
Low liquid conductivity is another possible reason. Standard electromagnetic flow meters require a minimum conductivity level to operate correctly. If the conductivity is below the specified range, the output may remain at zero even though liquid is flowing.
Improper grounding can also affect measurement. Electrical interference from nearby motors, pumps, or frequency converters may prevent the transmitter from detecting the actual flow signal.
Other factors include incorrect wiring, damaged signal cables, incorrect parameter settings, or flow velocity below the meter's measurable range.
Before replacing the flow meter, it is recommended to verify:
Is the pipe completely full?
Does the liquid meet the minimum conductivity requirement?
Is the grounding installed correctly?
Are all electrical connections secure?
Are the transmitter parameters configured correctly?
Most zero-reading issues can be resolved without replacing the instrument.
AOBO electromagnetic flow meters support multiple conductivity ranges and provide technical guidance to help users quickly identify the actual cause of abnormal readings.

03/08/2026

Why Is Proper Grounding Essential for Electromagnetic Flow Meters?
Electromagnetic flow meters measure extremely small electrical signals generated by conductive liquids. These signals are often only a few millivolts, making them highly sensitive to electrical interference.
For this reason, proper grounding is not simply an installation recommendation—it is an essential requirement for achieving stable and accurate flow measurement.
Grounding provides a stable electrical reference between the flow meter and the process liquid. Without this reference, external electromagnetic noise from motors, frequency converters, pumps, or nearby power cables can interfere with the measurement signal, resulting in unstable readings or reduced accuracy.
In many installations, a metal pipeline already provides a reliable grounding path. However, this is not always the case.
Grounding rings or grounding electrodes are generally recommended in the following situations:
Plastic or PVC pipelines, where the pipe itself cannot provide electrical continuity.
Pipes lined with insulating materials, such as PTFE or rubber, which isolate the liquid from the pipeline.
Pipelines with non-metallic flanges or gaskets that interrupt electrical continuity.
Applications with significant electrical interference, including variable frequency drives (VFDs), large motors, or high-power electrical equipment installed nearby.
Long-distance installations where electrical potential differences may exist between different sections of the pipeline.
Without proper grounding, users may experience:
Unstable flow readings
Zero-point drift
Signal fluctuations
Increased electrical noise
Reduced measurement reliability
Correct grounding helps eliminate these problems and allows the electromagnetic flow meter to detect the true flow signal rather than unwanted electrical interference.
For reliable operation, grounding should always be considered during system design rather than after commissioning. Selecting the correct grounding method according to the pipeline material and installation environment is just as important as choosing the correct flow meter itself.

31/07/2026

Why Must Electrode and Liner Materials Be Selected Together?
Selecting the right materials is just as important as selecting the right flow meter.

An electromagnetic flow meter contains two key components that come into direct contact with the process liquid—the electrodes and the liner. Both play different roles, and both influence the long-term performance of the meter.

Choosing them as a matched combination helps ensure corrosion resistance, measurement stability, and a longer service life.

The electrodes detect the electrical signal generated by the conductive liquid, while the liner protects and electrically insulates the measuring tube. If either material is incompatible with the medium, the flow meter may experience corrosion, swelling, abrasion, leakage, or unstable measurement.

For example, Hastelloy electrodes may provide good corrosion resistance for certain chemical liquids, but if the selected rubber liner cannot withstand the same chemical composition or operating temperature, the meter may still fail. Similarly, PTFE offers excellent resistance to many corrosive liquids, but it may not be the most suitable choice for strongly abrasive media containing sand or mineral particles.

The correct selection should therefore consider several conditions together:
Chemical composition and concentration
Operating temperature
Abrasiveness and solid content
Pressure and vacuum conditions
Cleaning or sterilization requirements
Expected service life

Typical combinations may include:

1.316L electrodes + rubber liner
Suitable for many water and wastewater applications.
2.Hastelloy electrodes + PTFE or PFA liner
Commonly used for corrosive chemical solutions.
3.Titanium electrodes + corrosion-resistant liner
Often considered for seawater or chloride-containing liquids.
4.Wear-resistant electrodes + polyurethane liner
Suitable for abrasive media such as slurry or mining process water.
There is no universal electrode-and-liner combination suitable for every liquid. The most reliable solution is to evaluate the chemical, thermal, and mechanical properties of the medium before confirming the flow meter configuration.
AOBO provides multiple electrode and liner options for electromagnetic flow meters, helping customers select a compatible material combination for long-term and stable flow measurement.

Correct material matching protects the entire flow meter—not just one component.

30/07/2026

Still getting unstable flow readings because of vibration?
AOBO ABVR Vibration Resistant Vortex Flowmeter is built for demanding industrial environments.
✅ Strong vibration resistance
✅ Stable & accurate measurement
✅ 4-20mA + RS485 output
✅ Over-limit alarm function
Contact us for more details!

27/07/2026

Can Electromagnetic Flow Meters Measure Low-Conductivity Liquids?
Electrical conductivity is one of the key factors in electromagnetic flow meter selection. Electromagnetic flow meters operate according to Faraday’s Law of Electromagnetic Induction. When a conductive liquid flows through the magnetic field, a small voltage signal is generated and detected by the electrodes. If the liquid conductivity is too low, the signal may become weak, resulting in unstable or unreliable measurement.
However, not all electromagnetic flow meters have the same minimum conductivity requirement.
AOBO provides different electromagnetic flow measurement solutions for liquids with different conductivity levels:
Standard electromagnetic flow meter: ≥20 μS/cm
Suitable for drinking water, wastewater, industrial water, slurry, and common conductive chemical solutions.
Low-conductivity electromagnetic flow meter: ≥5 μS/cm
Suitable for process liquids whose conductivity is lower than that of conventional industrial water and cannot be measured reliably by a standard electromagnetic flow meter.
Ultra-low-conductivity electromagnetic flow meter: ≥1 μS/cm
Designed for special low-conductivity applications where conventional electromagnetic flow meters may produce weak signals or unstable readings.
When selecting a flow meter, it is therefore not enough to confirm that the medium is a liquid. Its actual conductivity should also be checked. Fluid composition, temperature, flow range, pipe size, pressure, and liner and electrode compatibility must also be considered.
With conductivity measurement capabilities ranging from standard conductive liquids down to 1 μS/cm, AOBO electromagnetic flow meters provide more flexible solutions for water treatment, chemical processing, industrial utilities, and other demanding applications.
Choose the correct conductivity range for stable and reliable flow measurement.

15/07/2026

Can Electromagnetic Flow Meters Measure Any Liquid?
Electromagnetic flow meters are widely used in water treatment, chemical processing, food production, and many other industries. However, one common misconception is that they can measure every type of liquid.
The answer is no.
Electromagnetic flow meters can only measure electrically conductive liquids. Understanding this requirement is essential for selecting the right flow measurement technology.
Why Does Conductivity Matter?
Electromagnetic flow meters operate according to Faraday's Law of Electromagnetic Induction.
As a conductive liquid flows through a magnetic field, it generates a voltage that is detected by electrodes inside the flow tube. The flow meter then converts this voltage into a flow rate.
If the liquid has little or no electrical conductivity, no measurable voltage is produced, and the flow meter cannot operate correctly.
Suitable Liquids
Electromagnetic flow meters are ideal for conductive liquids such as:
1.Drinking water
2.Wastewater
3.Industrial process water
4.Acids and alkalis
5.Chemical solutions
6.Slurry and pulp
7.Food and beverage liquids
These applications provide sufficient electrical conductivity for stable and accurate measurement.
Liquids That Are Not Suitable
Electromagnetic flow meters are generally not recommended for non-conductive liquids, including:
1.Oils and fuels
2.Petroleum products
3.Most organic solvents
4.Liquefied gases
5.Pure hydrocarbons
For these applications, other technologies such as ultrasonic, Coriolis, turbine, or vortex flow meters may be more appropriate, depending on the process conditions.
How to Choose the Right Flow Meter
Selecting a flow meter should always begin with the properties of the process fluid.
Before choosing an electromagnetic flow meter, consider:
1.Is the liquid electrically conductive?
2.What is the operating temperature and pressure?
3.Does the liquid contain solids or air bubbles?
4.What level of accuracy is required?
Answering these questions helps ensure reliable performance and long-term measurement stability.

13/07/2026

Can Ultrasonic Flow Meters Measure Dirty Water?
This is a common question when selecting a flow meter for industrial applications.
The answer is not simply "yes" or "no." While transit-time ultrasonic flow meters can measure clean water and some slightly contaminated liquids, they are generally not the preferred choice for wastewater or heavily contaminated media.
The most suitable flow meter always depends on the characteristics of the liquid.
Why Are Ultrasonic Flow Meters Not Ideal for Wastewater?
Transit-time ultrasonic flow meters measure flow by transmitting ultrasonic signals through the liquid.
When the liquid contains large amounts of suspended solids, sludge, or air bubbles, the ultrasonic signals may be scattered or weakened. As a result, measurement stability and accuracy can be affected.
For this reason, transit-time ultrasonic flow meters are typically recommended for:
1.Clean water
2.Chilled water
3.Hot water
4.Industrial circulating water
5.District heating systems
These applications provide stable acoustic conditions for reliable measurement.
Which Flow Meter Is Better for Wastewater?
For wastewater, sewage, and liquids with high concentrations of suspended solids, an electromagnetic flow meter is generally the better solution.
Electromagnetic flow meters measure conductive liquids based on Faraday's Law of Electromagnetic Induction and are not affected by suspended solids, sludge, or liquid transparency.
This makes them well suited for applications such as:
1.Municipal wastewater
2.Industrial wastewater
3.Slurry
4.Mining process water
5.Chemical process liquids
As long as the liquid is electrically conductive, an electromagnetic flow meter can provide stable and accurate measurement.
Selecting the Right Technology
Choosing a flow meter is not about selecting the most advanced technology—it is about selecting the most appropriate one.
Transit-time ultrasonic flow meters are an excellent choice for clean liquid applications requiring low maintenance and long-term stability.
For wastewater and heavily contaminated liquids, electromagnetic flow meters usually offer better measurement reliability and are the preferred solution.
Conclusion

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