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1. How to install an ultrasonic flowmeter The key to installing an ultrasonic flowmeter lies in the accurate positioning of the sensor and the accurate setting of system parameters, which directly determine the measurement accuracy.
1. Preparation before Installation 1 On site investigation • Pipeline conditions: confirm the pipe material (steel, cast iron, PVC, etc.), diameter range (usually DN15-DN6000mm), wall thickness (to meet the requirements of sensor installation) • Fluid properties: clarify the medium type (clean water, sewage, alcohol, etc.), temperature range (-30 ℃~200 ℃), whether there are bubbles or solid particles • Installation location: select the full pipe section, upstream straight pipe section ≥ 10D, downstream ≥ 5D (D is the pipe diameter), away from flow disturbances such as pumps, valves, elbows, etc. 2 Installation method selection based on pipeline conditions and accuracy requirements: • Z method (reflective): suitable for large-diameter pipes (>DN50mm) with high signal strength, standard installation method • V method: suitable for small-diameter pipes (DN15-DN50mm) with small acoustic angles and low installation space requirements • W method: used for scenarios with extremely high measurement accuracy requirements or poor fluid conditions, requiring the installation of multiple pairs of sensors
2. Sensor installation steps 1 Surface treatment • Thoroughly remove the anti-corrosion layer, rust, and bumps in the installation area • Use an angle grinder to polish until the metal body is exposed, with a surface roughness Ra<6.3 μ m • The polishing area is larger than the range of the coupling agent filling block (usually 100 × 100mm) 2. Positioning measurement • Use a tape measure to accurately measure the outer circumference of the pipeline and calculate the outer diameter (formula: outer diameter=circumference/π) • Calculate the distance between the two sensors according to the flowmeter instructions (Z-method distance is 1.0-1.2 times the diameter of the pipeline) • Use a dedicated positioning paper mold or laser locator to mark the installation point, with an error of<1mm 3. Install the sensor • Apply a dedicated coupling agent (silicone grease or epoxy resin base) evenly on the sensor radiation surface • Use an installation fixture to tightly adhere the sensor to the pipe wall, with torque controlled at 15-20N · m（ Specific reference to manufacturer requirements) • Ensure that the sensor is parallel to the pipeline axis, with an offset angle of<3 °
III. System debugging 1 Parameter configuration • Input pipeline material (carbon steel sound speed usually 5920m/s), wall thickness, fluid type (water sound speed 1480m/s/20 ℃) • Set sensor installation method (Z/V/W method) and spacing • Select flow unit (m ³/h, L/min, etc.) and output signal type (4-20mA/pulse/RS485) 2. Signal optimization • Observe signal strength (recommended>60) and signal quality (Q value>80) • Adjust sensor position or coupling agent dosage until a stable signal is obtained • Implement zero calibration (calibrate zero flow value in closed fluid state)
4. Accuracy verification and safety warning 1 Accuracy verification method • Comparison measurement with portable ultrasonic flowmeter (error should be less than ± 1% of the displayed value) • Container calibration method (collecting fixed time flow rate and instrument cumulative value comparison) • Cross validation using existing high-precision instruments in the