Some abnormal phenomena and faults will appear during the use of ultrasonic flowmeter. Now, some fault phenomena will be analyzed as follows:
1. Failure phenomenon: unstable reading and drastic change
Reason analysis: the pipeline where the ultrasonic flow sensor is installed vibrates greatly or there is a device that changes the flow state (such as the flow meter is installed downstream of the regulating valve, pump, and constriction hole)
Solution: Refit the flow sensor away from the vibration source or move it upstream of the device that changes the flow pattern
Second, the fault phenomenon: the reading is inaccurate and the error is large
Cause Analysis:
1. The sediments installed on the top and bottom of the horizontal pipeline by the ultrasonic flowmeter sensor interfere with the ultrasonic signal. Solution: Install the sensors on both sides of the pipeline.
2. The ultrasonic flowmeter sensor is installed on the pipe with the water flowing downward, and the pipe is not filled with fluid. Solution: Install the sensor on the pipe section filled with fluid.
3. There are devices that make the flow state violently fluctuate, such as venturis, orifice plates, vortex streets, turbines, or partially closed valves, which are within the range of sensor transmission and reception, making the reading inaccurate. Solution: Install the sensor far away from the above-mentioned device, the sensor upstream from the above-mentioned device 30D, downstream from the above-mentioned device 10D or move to the upstream of the above-mentioned device.
4. The input diameter of the ultrasonic flowmeter does not match the inner diameter of the pipeline. Solution: Modify the pipe diameter to match.
3. Failure phenomenon: the sensor is good, but the flow rate is low or no flow rate
Cause Analysis:
1. The paint and rust outside the pipeline have not been removed. Solution: Clear the pipeline again and install the sensor.
2. The uneven surface of the pipe or the ultrasonic flowmeter is installed at the welding seam. Solution: Grind the pipeline flat or away from the weld.
3. The roundness of the pipe is not good, the inner surface is not smooth, and there is pipe liner scale. If the pipe is made of cast iron, this may happen. Solution: Choose steel pipe and other places with smooth inner surface material or lining.
4. The measured medium is pure or solid suspended matter is too low. Solution: Choose other suitable instruments.
5. The sensor is installed on the fiber glass pipeline. Solution: remove the glass fiber.
6. If the sensor is installed on the casing, the ultrasonic signal will be weakened. Solution: Move the sensor to the pipe section without casing.
7. The coupling between the sensor and the pipeline is not good, and there are gaps or bubbles on the coupling surface. Solution: Reinstall the coupling agent.
4. Failure phenomenon: when the control valve is partially closed or the flow rate is reduced, the reading will increase
Reason analysis: The sensor is installed too close to the downstream of the control valve. When the valve is partially closed, the flowmeter actually measures the flow rate of the reduced diameter of the control valve. The flow rate increases due to the reduced diameter.
Solution: Move the sensor away from the control valve, the sensor upstream from the control valve 30D or move the sensor to the control valve upstream from the control valve 5D.
5. Failure phenomenon: The ultrasonic flowmeter works normally, and suddenly the ultrasonic flowmeter no longer measures the flow
Cause Analysis:
1. The measured medium has changed. Solution: Change the measurement method.
2. The measured medium is vaporized due to excessive temperature. Solution: Cool down
3. The temperature of the measured medium exceeds the limit temperature of the sensor. Solution: Cool down
4. The coupling agent under the sensor is aged or consumed. Solution: reapply the coupling agent
5. Due to the occurrence of high-frequency interference, the instrument exceeds its own filter value. Solution: stay away from interference sources
6. The data in the computer is lost. Solution: Re-enter the correct parameters
7. Computer crashes. Solution: restart the computer
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Suzhou Herstar Medical Technology Co., Ltd. , https://www.hosunherstar.com