Ultrasonic level difference meter (ultrasonic level difference meter) is used to measure the difference between the level or material level of two different containers. The most common is to measure the water level before and after the coarse grille and the fine grille at the water inlet of the sewage treatment plant, and calculate the height of the water level difference to start the anti-fishing decontamination machine to remove the garbage. It is also installed before and after the gate, and the water level difference before and after the gate is measured to determine the opening time. Some do not measure the liquid level difference, but measure the height of the water level of the two pools, and then output 2 channels of 4-20mA. This is called a "dual channel level gauge".
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