Ultrasonic water flow meter adopts the new electronic technology of microprocessor and ultrasonic echo recognition, which has high accuracy and good reliability. It has interfaces of RS232, 4~20 mA, RS-485 and pulse output, which is suitable for all TV transmission requirements. The reception of energy and signals is carried out through an anti-interference structure, which can work normally under harsh conditions.

Ultrasonic water flow meter selection

Common Ultrasonic water flow meter mainly portable ultrasonic flow meter, handheld ultrasonic flow meter and fixed ultrasonic flow meter, the three flow meter features are compared as follows:

(1) portable ultrasonic flow meter for non-contact measurement, small size, easy to carry. Suitable for on-site measurement of various sizes of pipeline sound-conducting medium. Measuring medium including water, industrial sewage, acid and alkali liquids, various oils and other liquids that can conduct sound waves. Measurement of the flow rate range of (0 ~ ± 30) m / s, measurement accuracy level better than 1%.

(2) Handheld ultrasonic flowmeter, small size, light weight, easy to carry, flexible operation, automatic data storage, full Chinese display. Measuring media including water, seawater, industrial sewage, alcohol, acid reduction fluid, various oils and other uniform, single, stable liquid. The flow rate range is (0.01 ~ ± 32) m / s, the measurement accuracy level is better than 1%.

(3) Fixed ultrasonic flowmeter, compact, sturdy, internationally advanced die-casting aluminum chassis. Measuring media including water, seawater, industrial sewage, acid and alkali liquids, various oils and other liquids that can conduct sound waves. The flow rate range is (0 ~ ± 30) m / s, the measurement accuracy level is better than 1%.

Bio-chemical enterprise production system contains a small amount of impurities in the circulating water, the comprehensive factors to consider, the pipeline circulating water flow is appropriate to use portable ultrasonic flowmeter for measurement.

What affects the accuracy of ultrasonic water flow meter measurements?

• Noise

In the design and installation process, the influence of noise must be concerned. In the actual working process, the flow rate, temperature, pressure and other parameter factors will also be changed, the flow meter is used in the process of noise interference is very obvious, after the emergence of the meter will be obvious transmission errors, and will be indicated. In a variety of industrial production, the noise will be generated with the pipeline, valves, various equipment components, a variety of pipe walls to spread, the noise formed by the interference will lead to the measurement of equipment can not work properly.

• Dust accumulation

Impurities will accumulate on the surface of the pipeline, and even block the probe, thus causing some deviation in the detection data. If there is a large number of impurities attached to the probe, it will reduce the transmission efficiency of ultrasound, which in turn affects the sensitivity of the probe. If the equipment on the accumulation of ash, flowmeter measurement will have a large deviation, if the accumulation of serious ash will directly affect the accuracy of measurement.

• Fluid velocity

ultrasonic flowmeter in theory is a uniform distribution of fluid in the pipeline, but in practice, there is no uniform distribution of flow rate, the distribution of the fluid will be there are errors and affect the accuracy of the measurement. In addition, the liquid density, fluid velocity, refraction, straight pipe section will affect the measurement of the flow meter.

• The influence of liquid density

In the process of boiler circulating water testing, according to the technical requirements of the relevant regulations, the solid fuel boiler test time can not be less than 8h. In the application of ultrasonic flowmeter to start the test before the need to set the density value, and this will result in a certain degree of measurement error with the actual density value. Therefore, in the boiler test, you need to do a good job of the corresponding measures, such as pipeline and water storage tank insulation, reduce the water temperature difference brought about by the random error and so on.

Ultrasonic water flow meter Measurement accuracy solution

• Reduce noise

Noise can have a great impact on the equipment. Before installing the pipeline, firstly, according to the installation requirements given by the flow meter manufacturer, you should firstly consider installing the regulating valve in the downstream of Ultrasonic water flow meter and make sure that there is as big installation distance as possible. Ensure that the fluid economic flow rate, is strictly prohibited excessive flow rate, overload operation. Secondly, when operating the valve before and after the flow meter, the valve should be switched on and off slowly to avoid violent pressure fluctuations and to radically reduce the impact of noise.

• Reduction of impurities near pipelines

In the management of water flow monitoring operations, dust should be cleaned in the vicinity of the pipe section and flow meter in a timely manner. After cleaning, if there is corrosion, contact a technician. Judgment based on the problem. For example, when the measurement equipment on the inner wall of the accumulation of dirty substances, the software will show that the equipment acceptance rate and gain parameters are unreasonable, after the emergence of analysis and judgment, it can be dealt with. Usually should reduce the use of large-diameter flowmeter.

• Ensure the accuracy of pressure and temperature measurement

When applying Ultrasonic water flow meter, the pressure and temperature values at the experimental site should be emphasized. It is generally necessary to check the pressure and temperature parameters in time to ensure that the display value error of the pressure and temperature transmitter is in accordance with the requirements of the accuracy level. When there is a failure to meet the standard requirements, calibration or replacement should be taken immediately. Furthermore, in order to reduce the impact of temperature changes on the zero position, the pressure transmitter can be covered with a tarpaulin. At the same time, the temperature transmitter should also be well maintained, regularly adding thermal oil. In addition, it is also necessary to pay attention to the maintenance of the protective tube sleeve, regular cleaning and washing. To improve the accuracy of measurement, we must pay attention to the measurement range, to ensure that the measurement range is not less than 10% of the full range, in order to effectively improve the accuracy of measurement and detection.