Gas ultrasonic flowmeter | Can ultrasonic flowmeter measure compressed air

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1. What is the working principle of natural gas pipeline ultrasonic flowmeter? The core working principle of natural gas pipeline ultrasonic flowmeter is to calculate the flow velocity and flow rate by measuring the time difference between the forward and backward propagation of ultrasonic waves in the flowing gas. 1. Basic measurement principle: Ultrasonic flow meters use the time difference method for measurement. Insert a pair of ultrasonic transducers (probes) diagonally at a certain angle on both sides of the pipeline, and they alternate as transmitters and receivers. Parallel propagation: When the ultrasonic signal flows in the same direction as the gas, its propagation speed will increase (the component of sound velocity+airflow velocity in the direction of the sound path). Counter current propagation: When the ultrasonic signal flows in the opposite direction to the gas, its propagation speed will slow down (sound velocity - the component of the airflow velocity in the direction of the sound path). The high-precision clock circuit will measure the forward time (t ₁) and backward time (t ₂) separately, and calculate the time difference Δ t=t ₂ - t ₁. The average flow velocity (V) of the fluid is directly proportional to the time difference Δ t, and combined with parameters such as the cross-sectional area of the pipeline, the working condition volume flow rate and the standard volume flow rate after temperature and pressure compensation can be calculated based on noise and slip. Piezoelectric ceramic materials are usually used, and their performance directly determines measurement accuracy and stability. High precision timing circuit: used to measure nanosecond time differences and is the key to ensuring measurement accuracy. Flow computer (transmitter): responsible for controlling probe operation, collecting time data, performing flow calculation, temperature and pressure compensation, and data output. Measurement pipe section: To ensure measurement accuracy, it is usually required to have a sufficiently long straight pipe section upstream and downstream of the instrument to stabilize the flow field. 3. Unique performance advantage: no pressure loss: due to non-contact measurement of combustion collision, no pressure loss will be generated in the pipeline, and the energy-saving effect is good. Wide range ratio: The range ratio can reach 1:100 or even higher, enabling precise measurement of flow changes from very small to very large. High precision: In the field of trade measurement, its accuracy level can usually reach 0.5 or 1.0. Bidirectional measurement: can simultaneously measure flow in both directions

4. Key application parameters and selection. In practical selection and application, the following parameters should be focused on to ensure accurate measurement: Diameter (DN): selected according to pipeline size and flow range, commonly ranging from DN50 to DN1200 or even larger. Pressure rating (PN): Must match the pipeline design pressure, such as PN16, PN25, PN40, etc. Gas components: Different natural gas components have different sound velocity characteristics, which need to be set in the instrument. Installation conditions: It is necessary to meet the requirements of the front and rear straight pipe sections (usually 10D in the front and 5D in the back, where D is the pipe diameter), otherwise it will seriously affect the accuracy.

2. Can ultrasonic flow meters measure compressed air?

Ultrason

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