What Is a Portable Flow Meter?

The portable ultrasonic flowmeter is an instrument for measuring liquid flow using an external clip sensor.

Portable ultrasonic flowmeter

The ultrasonic flowmeter uses an external clamp sensor to measure the liquid flow. The installation process is extremely simple, and the all-Chinese interface makes it easier to operate. Particularly suitable for flow balance testing and flow monitoring: drinking water, river water, sea water, cooling water, hot water, industrial sewage, lubricants, diesel, fuel oil and chemical liquids.

1. Non-contact measurement method, small size, light weight, easy to carry.

2. The installation of the sensor is simple and easy, and it is used to measure the sound conducting media of pipes of various sizes.

3. The measuring process does not need to damage the pipeline, does not need to stop production, the sensor does not contact the measured medium, and there is no pressure loss.

4. Suitable for measuring metal pipes, plastic pipes and other sound-transmitting materials.

5. Built-in rechargeable battery, can work continuously for more than 12 hours.

6. Intelligent on-site printing function to ensure the integrity of flow data.

Measuring liquid: single fluid such as water, seawater, alkali, turbidity is less than 10000ppm, particle size is less than 1mm;

Pipe material: steel, cast iron, PVC pipes and other ultrasonic penetrable full pipes, dense in texture, without serious corrosion and scaling, allowing thin layers of dense lining

Pipe lining material: rubber, epoxy asphalt, FRP, mortar, etc., or unlined pipe diameter range: DN15mm ~ 6000mm

Straight pipe length: upstream> 10D, downstream> 5D (D: pipe diameter)

Display mode: Two-line 20-character LCD display

Ambient temperature / humidity: host -20 ~ + 50 ; sensor -20 ~ + 120 , the sensor can work in water, the water depth is less than 2m

The portable ultrasonic flowmeter uses the principle of low voltage and multi-pulse time difference, and adopts high-precision and ultra-stable double-balanced signal differential transmission and differential reception digital detection technology. When the ultrasonic beam propagates in the liquid, the flow of the liquid will cause the propagation time. For small changes, the change in its propagation time is proportional to the flow velocity of the liquid. At zero flow, the time required for the two sensors to transmit and receive sound waves is exactly the same (the only technology that can actually measure zero flow). When the liquid is flowing, the sound wave transmission time in the upstream direction is greater than the sound wave transmission time in the downstream direction. The relationship matches the following expression:

Portable

Basic Principles and Types of Ultrasonic Flowmeters When ultrasonic waves propagate in a flowing fluid, they carry information about the velocity of the fluid. Therefore, the flow velocity of the fluid can be detected by the received ultrasonic wave, and then converted into a flow rate. According to the detection method, it can be divided into different types of ultrasonic flowmeters such as the propagation speed difference method, Doppler method, beam offset method, noise method and related methods. Acoustic wave flowmeter is a kind that has been applied with the rapid development of integrated circuit technology in the past ten years.

Non-contact meter, suitable for measuring fluids that are difficult to contact and observe, as well as large pipe flow. It is linked with a water level gauge to measure the flow of open water. The use of ultrasonic flow rate does not change the flow state of the fluid without installing measuring elements in the fluid, and does not generate additional resistance. The installation and maintenance of the instrument can not affect the operation of the production pipeline, so it is an ideal energy-saving flow meter.

As we all know, the current industrial flow measurement generally has the problem of large pipe diameter and large flow measurement difficulty. This is because the general flow meter will cause difficulties in manufacturing and transportation with the increase of the measurement pipe diameter, increase the cost, and increase the energy loss. Large, installation not only these disadvantages, ultrasonic flowmeters can be avoided. Because all kinds of ultrasonic flowmeters can be installed outside the pipe, non-contact flow measurement, the cost of the instrument is basically independent of the size of the pipe being measured, while other types of flowmeters have a large increase in cost as the diameter increases, so the larger the ultrasonic wave The flowmeter has a better price / performance ratio than other types of flowmeters with the same function. It is considered to be a good instrument for measuring large-diameter flow. The Doppler ultrasonic flowmeter can measure the flow of dual-phase media, so it can be used for the measurement of sewage and sewage. In power plants, portable ultrasonic flowmeters are used to measure large-diameter flow rates, such as turbine water intake and steam turbine circulating water volume, which is much more convenient than the previous peel-off tube flow meter. Ultrasonic flow-through juice can also be used for gas measurement. The applicable range of pipe diameter is from 2cm to 5m, and it can be used from a few meters wide open channel and underdrain to 500m wide river.

In addition, the accuracy of flow measurement of ultrasonic measuring instruments is hardly affected by parameters such as temperature, pressure, viscosity, and density of the fluid being measured. It can also be made into a non-contact and portable measuring instrument, so it can solve the problems that other types of instruments are difficult to measure. Flow measurement of corrosive, non-conductive, radioactive and flammable and explosive media. In addition, in view of the characteristics of non-contact measurement, and equipped with reasonable electronic circuits, one instrument can be adapted to a variety of pipe diameter measurements and a variety of flow range measurements. The adaptability of ultrasonic flow meters is also unmatched by other instruments. The ultrasonic flowmeter has some of the advantages mentioned above, so it has been increasingly valued and developed towards product serialization and generalization. It has now been made into standard, high-temperature, explosion-proof, and wet-type instruments with different channels to adapt to different media. Measurements of occasions and different pipeline conditions.

The current shortcomings of ultrasonic flowmeters are mainly that the temperature range of the measurable fluid is limited by the temperature resistance of the ultrasonic transducer aluminum and the coupling material between the transducer and the pipeline, and the original data of the sound transmission velocity of the fluid under test at high temperature. Incomplete. At present China can only be used to measure fluids below 200 ° C. In addition, the measuring circuit of the ultrasonic flowmeter is more complicated than the general flowmeter. This is because the velocity of liquid in general industrial measurement is often a few meters per second, and the propagation speed of sound waves in the liquid is about 1500 m / s. The change in the velocity (flow rate) of the measured fluid brings the largest change in sound velocity. 3 orders of magnitude. If the accuracy of measuring the flow velocity is required to be 1%, the accuracy of measuring the speed of sound needs to be on the order of 10-5 to 10-6. Therefore, it must have a perfect measurement circuit to achieve this. Reasons for practical application can be obtained under the premise of rapid technological development.

Ultrasonic flowmeter consists of three parts: ultrasonic transducer, electronic circuit and flow display and accumulation system. The ultrasonic transmitting transducer converts electrical energy into ultrasonic energy and emits it into the fluid under test. The ultrasonic signals received by the receiver are amplified by the electronic circuit and converted into electrical signals representing the flow. And accumulation. In this way, the detection and display of the traffic is achieved.

It has unique applications in the petrochemical industry, nuclear power industry, and heat transfer oil fields, and uses energy calculation functions. It can measure temperature and introduce temperature signals to obtain energy parameters.

The ultrasonic flowmeter uses advanced DSP technology and a dual uP high-speed processor to increase the sampling frequency to 70ms, which can be used to measure changes in fluid flow in a very short period of time.

The ultrasonic flowmeter uses the patented Wave Injector technology. By setting up a metal waveguide plate between the pipeline and the probe, the medium's high temperature of 450 ° C can be lowered below 200 ° C to achieve the measurement possibility. There is a unique application in the field of heat transfer oil, and it adopts the energy calculation function, which can measure the flow rate and introduce temperature signals to obtain energy parameters.