Ultrasonic flowmeter and electromagnetic flowmeter are the same, because the instrument flow channel is not provided with any obstruction parts, are non-obstruction flowmeter, is suitable to solve the difficult problem of flow measurement of a class of flowmeter, especially in large-diameter flow measurement has more prominent advantages, in recent years it is one of the rapid development of a class of flowmeter. Let's take a look at it.
1. One of the five major faults: the reading is unstable and changes drastically
Cause analysis: The pipeline with ultrasonic flow sensor vibrates greatly or there is a device that changes the flow regime (such as the flow meter installed in the downstream of the control valve, pump, and shrinkage hole).
Solution: Retrofit the flow sensor away from the vibration source or move upstream of the flow regime change device.
Second, the second of the five major faults: the reading is inaccurate and the error is large
Causes:
1. The sediment installed at the top and bottom of the horizontal pipeline by the ultrasonic flowmeter sensor interferes with the ultrasonic signal. Solution: Install the sensor on both sides of the pipe.
2. The ultrasonic flowmeter sensor is installed on the pipeline where the water flows downward, and the pipe is not filled with fluid. Solution: Attach the sensor to a fluid-filled pipe section.
3. There are devices that make the flow state fluctuate strongly, such as: venturi, orifice plate, vortex flowmeter, turbine flowmeter or partially closed valves, which are just within the range of sensor transmission and reception, so that the reading is inaccurate. Solution: the sensor is installed in a place far away from the device, and the upstream of the sensor is 30D away from the device, and the downstream is 10D away from the device or moved to the upstream of the device.
4. The input pipe diameter of the ultrasonic flowmeter does not match the inner diameter of the pipeline. Workaround: Modify the pipe diameter to match.
3. The third of the five major faults: the sensor is good, but the flow rate is low or there is no flow rate
Causes:
1. The paint and rust outside the pipeline have not been removed. Solution: Re-clear the pipe and install the sensor.
2. The pipe surface is uneven or the ultrasonic flowmeter is installed at the welded joint. Solution: Smooth the pipe or move away from the weld.
3. The roundness of the pipe is not good, the inner surface is not smooth, and there is pipe lining scaling. This is possible if the pipe is cast iron. Solution: Choose a place with a smooth inner surface such as steel pipes or linings.
4. The measured medium is pure or solid suspended solid, which is too low. Solution: Choose other types of instruments that are suitable.
5. The sensor is installed on the fiberglass pipe. Solution: Remove the fiberglass.
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. Workaround: Reinstall the couplant.
Fourth, the fourth of the five major faults: when the control valve is partially closed or the flow rate is reduced, the reading will increase inversely
Reason analysis: the sensor is installed too close to the downstream of the control valve, and when the valve is partially closed, the flowmeter actually measures the flow rate of the control valve to increase the flow rate of the reduced diameter, and the flow rate increases due to the reduction of the diameter.
Solution: Move the sensor away from the control valve, and move the sensor upstream to the control valve 30D or move the sensor to the upstream distance control valve 5D from the control valve.
Fifth, the fifth of the five major faults: the ultrasonic flowmeter is working normally, and suddenly the ultrasonic flowmeter no longer measures the flow
Causes:
1. The measured medium changes. Solution: Change the measurement.
2. The measured medium is gasified due to high temperature. Solution: Cool down
3. The temperature of the measured medium exceeds the limit temperature of the sensor. Solution: Cool down
4. The couplant under the sensor is aging or consumed. Solution: Reapply the couplant
5. Due to the occurrence of high-frequency interference, the instrument exceeds its own filter value. Solution: Stay away from sources of interference
6. Data loss in the computer. Solution: Re-enter the correct parameters
7. The computer crashes. Workaround: Restart your computer
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