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1. What are the precautions for open channel flow meters?
What are the precautions for using open channel flow meters? In terms of non-standard operation, operators often do not follow the standard operating procedures, such as inaccurate measurement of pipeline outer diameter, circumference, wall thickness, contact temperature, etc. These parameters can have a significant impact on the correction of the original data of open channel flow meters.. In terms of installation methods, operators often do not choose the installation method according to the size of the pipeline and signal strength, and often choose the default dual path mode of the flowmeter. The correct installation method is to use a single acoustic path in large pipelines and complex environments; In the case of small pipelines and strong signals, choose multiple sound paths for backup. In terms of installation location, the installation personnel are not allowed to place ultrasound probes arbitrarily and do not confirm whether the medium in the pipeline is full, which is an important measurement condition. The correct installation position is:; The probe should be placed in the horizontal center of the pipeline to simulate the position of the pipeline; Accurate measurement can only be carried out when the pipeline is full, and a vertical pipeline with upward fluid flow can ensure full pipe flow. In addition, important parameters such as the type and thickness of the pipeline lining on site are often difficult to obtain, which seriously affects the accuracy of the flowmeter. As a highly precise instrument, flow meters not only require strict adherence to their requirements during manufacturing and use, but also require special attention in la
2. Issues with open channel flow meters
1. There should be a straight section upstream of the channel that is greater than 5 times the width of the channel, so that the water flow can enter the channel smoothly.
.2、 The grooves are made according to standard dimensions, and the cross-sectional area can be calculated based on the height of the liquid level to calculate the instantaneous flow rate. The built-in flow accumulator of the open channel flowmeter can accumulate the instantaneous flow rate.
3、 The water is in a static state, and the flow rate should be zero. It depends on the settings of the internal data parameters of your instrument. 4. Installation issues of the liquid level gauge: whether the position is correct, whether the highest water level enters the blind zone of the liquid level gauge (ultrasonic liquid front chain level gauge Huiju). If it is a static pressure level gauge, then check whether the pressure hole of the sensor probe is blocked. 3. Flow meters that can measure the flow rate of the bar type measuring tank. There are mainly three types of flow meters that can be used to measure the flow rate of the bar type measuring tank: ultrasonic flow meter, electromagnetic flow meter, and open channel flow meter. 1. Ultrasonic flow meter Working principle: Using the time difference between the propagation of ultrasonic waves in the fluid, the flow velocity is measured and the flow rate is calculated. 2. Installation characteristics: No need to damage the channel structure, non-contact installation can be achieved. 3. Applicable scenarios: It can adapt to various types of water quality in the bar type measuring tank,