What are the advantages and disadvantages of the external clamp type ultrasonic flowmeter?
External clamp type ultrasonic flowmeter shall be informed of the site before installation, including:1. what is the distance from the host to the installation sensor?;2. pipe material, pipe wall thickness and pipe diameter;3. pipeline life;4. fluid type, whether it contains impurities, bubbles, and whether it is full;5. fluid temperature; (insert sensor, pipe pressure)6. are there any interference sources (such as frequency conversion, high voltage cable farm, etc.) on the installation site?;7. the temperature of the four seasons at the main place;8. is the power supply voltage stable?;9. does it require remote transmission signals and types?;According to the above provided site conditions, manufacturers can be configured for the scene, and, if necessary, special models.
Ultrasonic flowmeter generally can be divided into field sensors (probes), transmission cables, display three major parts of the host. The sensor has a clamp, insert type, method type (i.e. blue pipe type), show host fixed points, portable, and portable console can be equipped with clamp type sensor compared to fixed ultrasonic flowmeter on-line (calibration) and the installation is very simple. The external clamp type ultrasonic flowmeter, the sensor of the brightness of the outer wall of the outer wall of the pipe, needs to be polished and smooth after the installation of the outer wall of the pipe. The sensor (probe) shall be attached to the outer wall of the tube with a coupling agent and then be fixed with a special clamping device. The method can conveniently measure water flow outside the pipe, and is also suitable for portable. The disadvantage is that due to the improper disposal of coupling agent, the signal receiving state is malignant and the stability of measurement is affected. The fixed external clamp type ultrasonic flowmeter has many advantages, such as accuracy, stability, easy operation and so on. The utility model is used for measuring the flow of large pipelines, and is convenient to use. The sensor can be measured only by clamping the sensor in the pipeline according to the regulation mode, and the measuring accuracy is not accurate without the need for a broken pipeline. IP68 sensors used to protect the probe, longer service life, 5-6 years without replacement, can work steadily. Clamp on ultrasonic flowmeter, high requirement for installation personnel, installation level directly affects the measurement accuracy, days after the maintenance work, long time after the operation, the coupling agent or sensor failure, position change will affect the measurement, regular maintenance.
Selection and installation position of external clamp type ultrasonic flowmeterThe choice of the installation pipe section has a great influence on the testing accuracy, and the selected pipe section shall avoid interference and eddy current, which have great influence on the measurement accuracy. Generally, the selection of the pipe section shall meet the following conditions: two:1, to avoid pumps, high-power radio, frequency conversion, that is, a strong magnetic field and vibration interference at the installation of machinery;2, the selection of the pipe should be uniform and dense, easy to ultrasonic transmission pipe section;3, to have long enough straight pipe section, installation point upstream straight pipe section must be greater than 10D (Note: D= diameter), the downstream is greater than 5D;4, installation point upstream from the pump should have 30D distance;5, the fluid should be filled with pipes;6, the pipeline around to have enough space for on-site personnel
