The Portable Ultrasonic Flow Meter utilizes advanced microprocessor technology and ultrasonic echo recognition, offering high precision and excellent reliability. It features interfaces such as RS232, 4~20 mA, RS-485, and pulse output, making it suitable for all types of video transmission requirements. The reception of energy and signals is conducted through an anti-interference structure, ensuring normal operation even under harsh conditions. The ultrasonic flow meter comes in two forms: clamp-on and inline. Due to its multiple probes, the Portable Ultrasonic Flow Meter is easy to carry, can display measurement results individually, and has a wide range of applications.
Advantages and Disadvantages of Portable Ultrasonic Flow Meter
Advantages:
Compared to other types of ultrasonic flow meters, the clamp-on ultrasonic flow meter offers disproportionate advantages. For example, the clamp-on flow meter with an external clamp allows the probe to be installed on the outer surface of the pipe, ensuring continuous flow and measurement without damaging the pipe. It also avoids the risk of debris entering the oil and gas transmission pipeline due to erosion damage of some components under high pressure. Additionally, due to low or almost zero pressure, the price of large-diameter ultrasonic flow meters on the market is very high.
If the clamp-on ultrasonic flow meter is not correctly calibrated or checked, any flow meter must be calibrated or checked before use. Checking or calibration requires a reference flow, so it is important to choose a flow meter that provides a standard flow. Portable ultrasonic flow meters typically come with three types of probes. These three probes are suitable for different pipelines and can be used with the main unit to form a single flow meter. For flow calibration, calibration devices of different diameters are needed to calibrate these three probes to match the pipeline being measured. It is correct to check or calibrate many portable ultrasonic flow meter tubes on a standard flow group, using the same or similar calibration as the tube used, and ensuring that each set of probes configured for the flow meter is calibrated. To avoid confusion, note the calibration and probe numbers. The clamp-on ultrasonic flow meter is particularly sensitive to bubbles in the measurement medium, which can cause unstable readings. If stored gas is located at the probe installation point, the flow meter will not work. Therefore, the installation position of the clamp-on ultrasonic flow meter should avoid pump outlets, strong magnetic fields, electric fields, and high pipeline points.
Disadvantages:
The temperature of the measured liquid is limited by the temperature resistance of the coupling material between the ultrasonic probe and the pipe. The original data of the sound speed of the measured liquid at high temperatures is not completely affected. Ultrasonic flow meters are only used to measure liquids below 200°C. The measurement accuracy is not sufficient. Currently, the accuracy of ultrasonic flow meters is generally around 1%, which cannot fully meet detection requirements. Ultrasonic flow meters are greatly affected by external conditions, such as strong electric and magnetic fields near the measurement pipe, which can affect the measurement of the ultrasonic flow meter.
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Selection and Application Characteristics of Portable Ultrasonic Flow Meter
Selection and Considerations:
According to the installation method of the converter, the selection and installation of the clamp-on ultrasonic flow meter can be divided into clamp-on, pipe-section, and insertion types. The clamp-on ultrasonic flow meter is an ultrasonic flow meter that connects the transducer to the external channel.
The Portable Ultrasonic Flow Meter is mainly used to measure the installation of transducers outside the pipe and near the pipeline. The signal transmission channel and signal reception channel are a relatively complex converter installation method, requiring suitable equipment to pass through the pipe and liquid medium, and rough measurement results are not accurate. Therefore, when selecting a sensor, the protection level of the sensor must be considered. Offshore oil platforms generally choose IP56 or above based on the usage environment. Additionally, the selection of the sensor installation position must be considered.
Valves, pumps, and high-power equipment should be installed as far away from the pipeline as possible to avoid significant impacts on measurement results from external factors. When installing the flow meter probe, try to install the probe on a smooth surface, or use sandpaper or other polishing agents to treat rust and asphalt at the pipeline installation position, or use duplex to eliminate uneven positions. Special equipment should also be used to fix the clamp-on ultrasonic flow meter to avoid affecting the continuity of fluid flow measurement. Additionally, due to the complex conditions of the measurement pipe section, which are difficult to access and observe, portable flow meters can be used to improve the stability and reliability of measurements.
