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1. How to interfere with ultrasonic flow meters
There are multiple methods to interfere with ultrasonic flow meters, one of which is to emit ultrasonic waves with the same frequency. This method interferes with the normal operation of ultrasonic flow meters by simulating or replicating their emission signals. In addition, continuous and high-intensity blasting sounds can also interfere with the normal operation of ultrasonic flow meters, which may cause errors in the signals received by the sensors, thereby affecting the accuracy of the flow meters. Another method is to use mud to sell the probe and apply it, and it must be thick enough. This can block the transmission of ultrasonic signals, causing the flowmeter to malfunction. In addition, crushing the ultrasonic probe is also an effective interference method, as even a small crack can change the center frequency of the probe, causing it to fail. Destroying temperature sensors is also an effective means of interference, which can lead to inaccurate temperature measurements and thus reduce the accuracy of flow meters. These interference methods may involve illegal behavior, causing damage to devices and systems. Therefore, when using ultrasonic flow meters, the safety of the surrounding environment and the integrity of the equipment should be ensured. At the same time, regular maintenance and inspection of flow meters are also important measures to prevent interference and ensure the normal operation of equipment. Absolute blindness
2. How to interfere with ultrasonic flow meters
There are several methods to interfere with ultrasonic flow meters: emitting ultrasonic waves of the same frequency as the flow meter. Continuous and high-intensity bla
3. Doppler open channel flowmeter
4. Frequency converter interference electromagnetic flowmeter. We are a water supply company, and the second monitoring point is located at the third monitoring point. From two aspects, one is the harmonic interference generated by the operation of the frequency converter, and the other is the wireless wave interference radiated outward by the frequency converter itself. The solution can consider
1. For harmonic interference generated by the operation of the frequency converter, filter reactors or various rectifier bridge circuits can be installed on the input side of the frequency converter to reduce high-order harmonic components. It is also possible to provide separate power to the instrument, such as using a separate transformer. As the upstairs staff suggested, an isolation transformer such as the Chasen Group can be used. 2. For radiation interference, the signal line of the electromagnetic flowmeter can be shielded with twisted pair or multi-layer shielded wire, and the ground wire shielded wire should be connected! The grounding of the secondary meter of the flowmeter and the grounding of the frequency converter should not share the same grounding system. They can be grounded separately or floating (the power supply circuit is not grounded). If the above measures are not easy to operate, it is recommended that you consult the electromagnetic flowmeter manufacturer to see if there