2019-10-11 17:28:20

Ultrasonic flowmeter features

The unique signal digitization processing technology makes the meter measurement signal more stable, anti-interference ability and more accurate measurement.

No mechanical transmission parts are not easily damaged, maintenance-free and have a long service life.

The circuit is more optimized, with high integration, low power consumption and high reliability.

Intelligent standard signal output, friendly man-machine interface, multiple secondary signal output, for you to choose.

Pipe-section small pipe diameter measurement is economical and convenient, and the measurement accuracy is high.

Detailed installation of ultrasonic flowmeter

Ultrasonic flowmeters should be aware of the site prior to installation, including:

1. What is the distance from the host at the installation of the sensor;

2. Pipe material, pipe wall thickness and pipe diameter;

3. Years of pipeline;

4. The type of fluid, whether it contains impurities, bubbles and whether it is full;

5. Fluid temperature;

6. Whether there is interference source at the installation site (such as frequency conversion, strong magnetic field, etc.);

7. Four seasons temperature at the host place;

8. Whether the power supply voltage used is stable;

9. Do you need remote signals and types;

According to the site conditions provided above, the manufacturer can configure the site conditions and, if necessary, special models.

Variable area flowmeter (equal pressure drop flowmeter)

The float placed in the upper and lower small tapered flow passages is moved by the force of the fluid flowing from the bottom to the top. When this force is balanced with the "display weight" of the float (the weight of the float itself minus the buoyancy of the fluid it receives), the capture is stationary. The height at which the float is stationary can be used as a measure of the flow rate. Since the cross-sectional area of ??the flowmeter varies with the height of the float, and the pressure difference between the upper and lower parts is equal when the float is stationary, the flowmeter is called a variable area flowmeter or an equal pressure dropmeter. A typical instrument of this type of flow meter is a rotor (float) flow meter.

Momentum flowmeter

A flowmeter weighing flowmeter that uses the momentum of a measuring fluid to reflect the flow rate. Since the momentum P of the flowing fluid is proportional to the density of the fluid and the square of the flow velocity v, i.e., p v2 , when the flow cross section is determined, v is proportional to the volumetric flow rate Q, so p Q2 . Set the proportional coefficient to A, then Q=A. Therefore, P is measured to reflect the flow rate Q. In this type of flowmeter, most of the flowmeters are used to convert momentum into pressure, displacement or force, and then the flow rate is measured. Typical meters for such flow meters are target and rotary wing flow meters.

Several problems of steam metering and their solutions

Steam is one of the important energy sources for enterprise production. It is the main heat energy for urban central heating and an important indicator for economic accounting. Therefore, the accuracy of steam metering is particularly important.

In order to solve the problem of heating for employees, the company has updated the original boiler equipment, adding 4 new boilers (2 sets of 25t/h, and another 2 sets of 35t/h). The DCS realizes the automatic control of the boiler system, and the product is saturated steam.

Analysis of problems and influencing factors

Starting from the boiler ignition operation in November 2010, the steam flow often shows the maximum value, and the differential pressure signal measured by the differential pressure transmitter exceeds 20 mA. The same is true when the load is low and the actual flow is small. In this case, steam flow measurement does not provide a safety reference for boiler operation, and it cannot be used for cost accounting.

In response to this phenomenon, the design of the project uses a V-cone flowmeter, equipped with an intelligent differential pressure transmitter, and the measurement signal is sent to the DCS for calculation and display.