External clamped ultrasonic flowmeter installation requirements

Time: 2024-09-11
Equipment Configuration:External clamped ultrasonic flowmeter

Externally clamped ultrasonic flowmeter is a device that measures fluid flow through ultrasonic technology.

Project Overview

Externally clamped ultrasonic flowmeter is a device that measures fluid flow through ultrasonic technology. Its principle, characteristics and installation requirements are as follows:

1. Principle

External Clamp-on ultrasonic flow meters measure the flow rate and flow rate of fluids by emitting ultrasonic pulses and receiving echoes. Its working principle is mainly based on the Doppler effect and the principle of sound speed propagation. Specifically, when an ultrasonic pulse passes through a fluid, if there are moving particles or bubbles in the fluid, the frequency of the ultrasonic wave will change. This change is called a Doppler shift. By measuring the Doppler shift, the velocity and flow rate of the fluid can be calculated. In addition, it can also adopt the principle of ultrasonic propagation time difference, that is, the transmitter sends ultrasonic pulses into the fluid in the pipe, and the receiver receives the ultrasonic pulses reflected back from the fluid, and based on the time difference and intensity of the reflected ultrasonic pulses, Determine the velocity and flow rate of the fluid.

2. Features

1. Non-contact measurement: The clamp-on ultrasonic flowmeter does not need to be in direct contact with the fluid, avoiding the fluid contamination problems that may exist with traditional flowmeters.

2. No pressure loss: Due to its non-contact measurement method, there will be no pressure loss on the fluid.

3. High precision: Through advanced measurement technology and algorithms, it can provide high-precision flow data.

4. Widely applicable: It can measure a wide range of media, including seawater, river water, drinking water, industrial sewage, groundwater, cooling water, high temperature water, sewage, lubricating oil, diesel, fuel oil, chemical liquids, etc. quality fluid.

5. Easy installation: It adopts external clamping installation, no need to cut or drill the pipe, and the installation process is simple and fast.

6. Simple maintenance: Regularly check the working status of the equipment, clean the sensors and fixtures, and the maintenance cost is low.

3. Installation requirements

1. Pipe preparation: Before installation, it is necessary to ensure that the surface of the pipe is smooth, clean, and free of impurities or corrosion. At the same time, select appropriate clamps and seals according to the material and size of the pipe.

2. Select the installation pipe section: The selected pipe section should avoid interference and eddy current, which have a greater impact on measurement accuracy. Specifically, installation should be avoided in places with strong magnetic fields and vibration interference such as water pumps, high-power radio stations, frequency converters, etc.; pipe sections should be selected that are uniform and dense and easy to transmit ultrasonic waves; there must be a long enough straight pipe section, and the straight pipe section upstream of the installation point must be Greater than 10D (D is the diameter of the pipe), and the downstream should be greater than 5D; the upstream of the installation point should be 30D away from the water pump; the fluid should fill the pipe; there should be enough space around the pipe to facilitate on-site personnel operation.

3. Installation method: There are two main installation methods for external clamp-type sensors (i.e. two probes): V-shaped installation and Z-shaped installation. The specific method chosen depends on the pipe diameter and site conditions. When installing, ensure close contact between the sensor and the pipe to ensure that the sensor can accurately receive ultrasonic signals.

3. Coupling agentUsage: During the installation process, special coupling agents (such as room temperature curing silicone rubber or high temperature long-chain polymeric grease) need to be used to ensure good coupling between the sensor and the pipe. The coupling agent should fill the gap between the sensor working surface and the pipe wall, and there should be no air or solid particles.

4. Signal debugging: After the installation is completed, signal debugging is required to ensure the accuracy of the measurement results. During the debugging process, the signal strength and stability of the sensor should be checked and adjusted as needed.

5. Parameter setting: Before use, some parameters need to be set according to the actual situation, such as pipe size, fluid type, temperature, etc. These parameters can be set via the display or data acquisition system.

6. Calibration: After initial use or replacement of pipes, calibration operations are required to ensure the accuracy of measurement results. Calibration operations can be performed according to the equipment instructions.

The externally clamped ultrasonic flowmeter has the characteristics of non-contact measurement, high precision, and wide application. Good standard installation and reasonable use can not only improve the measurement accuracy, but also extend the service life of the flowmeter. service life.

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