With the development of society and the continuous expansion of the scale of enterprises, corresponding environmental pollution has also occurred, and pollution caused by sewage discharge is one of them. Relevant departments continue to increase flow measurement equipment in order to better monitor the sewage discharge of enterprises, but they also need to be manually calibrated regularly during use. In order to alleviate the working pressure of related staff and complete the calibration work quickly and accurately, a complete system of open channel flow measurement and comparison collection is proposed. In practical applications, the magnetostrictive liquid level sensor
is not used independently, but in the open channel flow measurement acquisition and comparison system. The open channel weir trough flowmeter consists of a flow measuring instrument, a flow collecting instrument and a software testing system. A magnetostrictive liquid level sensor is a key component in the entire flow measurement acquisition and comparison system.
The liquid level and interface signals output by the magnetostrictive liquid level sensor are mainly divided into analog and serial ports. The serial port is in the form of RS485 / 232, the analog is a 4 to 20 mA current analog signal, and the corresponding range is 0 to 1 m. The output serial port or analog signal is transmitted to the main board through a shielded cable. The main board converts the received serial port signal or analog signal into a digital quantity and displays it on the text display through the integrated circuit. Due to the presence of motors or pumps and other execution equipment during online monitoring The interference signal generated, and the distance between the collection point of the field signal and the control cabinet. In order to reduce the interference of the signal during the transmission, shielded cable should be used.
At present, the commonly used open channel flow measurement method mainly uses ultrasonic liquid level sensors to measure. However, by comparing the two sensor measurement methods with manual measurement data, it is not difficult to see that the advantages of the magnetostrictive liquid level sensor are more obvious. In the open channel flow measurement, the magnetostrictive liquid level sensor is closer to manual measurement, and has the characteristics of easy maintenance, no frequent calibration, and long service life. It can quickly measure the liquid level height, improve work efficiency, and have practical Application value can replace manual calibration and is worth further promotion.
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