Ultrasonic flowmeter is a non-contact or contact instrument that uses the time difference or frequency change of ultrasonic signals propagating in a fluid to measure flow velocity and calculate flow rate. It has the advantages of easy installation, no pressure loss, and wide applicability, but the following key points should be noted when using it to ensure measurement accuracy and equipment life:

1、 Installation environment and location selection

1. Avoid interference sources
   • Stay away from equipment that is prone to turbulence or vibration, such as pumps, valves, and elbows. It is recommended that the length of the upstream straight pipe section be ≥ 10 times the pipe diameter, and the downstream section be ≥ 5 times the pipe diameter.
   • Avoid strong electromagnetic fields (such as frequency converters, high-voltage lines) or high temperature environments (>60 ℃) to prevent signal interference or sensor damage.
2. Pipeline condition requirements
   • Full pipe statusEnsure that the fluid inside the pipeline is filled to avoid measurement errors caused by empty or half pipe conditions.
   • Pipe wall materialExternal clamp sensors require uniform pipe walls, no corrosion or scaling; Insertion sensors require uniform wall thickness.
   • Fluid characteristicsSuitable for cleaning liquids or fluids containing small amounts of particles, avoiding high concentrations of suspended solids or bubbles (such as sewage and slurry that require special treatment).
3. Installation method selection
   • external clip-onSuitable for temporary measurement or situations where shutdown is not possible, but it is necessary to ensure that the sensor is tightly attached to the pipe wall and use a coupling agent to eliminate air.
   • Insertion type/pipe segment typeShutdown installation is required, but the measurement is more stable and suitable for long-term monitoring.

2、 Parameter setting and calibration

1. Accurate input of pipeline parameters
   • Input parameters such as the inner diameter, material, and wall thickness of the pipeline, with an error controlled within ± 1%, otherwise it may cause deviation in flow rate calculation.
   • For non-standard pipelines (such as elliptical and deformed pipes), correction factors need to be calibrated through real flow.
2. Fluid parameter matching
   • Set parameters such as fluid type (water, oil, gas, etc.), temperature, pressure, etc., to affect sound velocity calculation and compensation algorithms.
   • High temperature fluids require temperature compensation to prevent errors caused by changes in sound velocity.
3. Regular calibration and verification
   • Use standard flow devices (such as volumetric method, weighing method) or portable ultrasonic flow meters for cross validation.
   • It is recommended to calibrate every 6-12 months or adjust the cycle according to usage frequency and environmental conditions.

3、 Key points of operation and maintenance

1. Pre startup inspection
   • Confirm that the sensor is securely installed and the coupling agent is not missing (external clamp type).
   • Check the signal strength (usually ≥ 70%), and if the signal is weak, adjust the position or clean the pipe wall.
2. Monitoring during operation
   • Observe whether the parameters such as flow rate, flow velocity, and signal quality are stable. Abnormal fluctuations may indicate scaling, bubbles, or sensor failures in the pipeline.
   • Avoid sudden changes in fluid flow velocity (such as quick opening and closing of valves) and prevent water hammer effects from damaging sensors.
3. regular maintenance
   • Clean the pipe wallCheck the inner wall of the pipeline every 3-6 months to remove scale or sediment (especially for external clamp sensors).
   • Replace the coupling agentThe coupling agent of the external clamp sensor should be replaced every 1-2 years to prevent aging and failure.
   • Check the cableEnsure that the signal line is not damaged or loose, and avoid poor contact.

4、 Special scenario precautions

1. High-temperature fluid
   • Select high-temperature sensors (such as titanium alloy materials) and equip them with cooling devices or extended signal cables.
   • Avoid direct contact with high-temperature pipelines to prevent sensor deformation or damage to electronic components.
2. Corrosive fluid
   • Choose corrosion-resistant sensors (such as Hastelloy, PTFE coating) and regularly check for leaks.
   • Plug in sensors need to be equipped with anti-corrosion lining to prevent pipe wall corrosion from affecting measurement.
3. Gas measurement
   • The gas should be dry, free of impurities, and avoid condensation water accumulating on the sensor surface.
   • Select a gas specific ultrasonic flowmeter and adjust the sound path angle to adapt to low-density media.

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