Electromagnetic flowmeter in the water industry maintenance management

A brief analysis of the importance and maintenance management of electromagnetic flowmeters in the tap water industry:

Measurement work is related to the production and operation of enterprises and the quality of products, especially in the tap water management industry of our city, the measurement of Pay more attention to the work, and whether the measurement work is done reasonably and in place directly affects the vital interests of water companies and water users. When water companies select flow meters, they generally consider factors such as the size of the delivery pipeline and the actual measurement accuracy of the delivery pipeline.

2 How do water companies choose flow meters

Selecting a suitable model is the key to maximizing the effectiveness of the flow meter. There are more than 100 manufacturers of large-diameter flow meters in our country, and there are countless models of flow meters on the market. Therefore, how to select a flow meter is a matter of great concern to Huaihai Measurement and Control. Generally speaking, when selecting a flow meter, we need to check whether the flow meter has passed quality inspection and whether the usage conditions of the flow meter can meet the actual installation. various requirements. The following summarizes some selection criteria for reference:

2.1 Refer to the size of the water pipe when selecting

Generally, water companies prefer electromagnetic flowmeters when selecting flowmeters. The first thing that comes to mind is electromagnetic flowmeters. For some large-scale projects, such as reservoirs and water diversion projects, Venturi tubes with relatively stable performance will be chosen. For large diameters, insertion flowmeters are generally not considered, and ultrasonic flowmeters are often chosen.

2.2 Relevant straight pipe section parameters when selecting a flow meter

When selecting a flow meter, the straight pipe section parameters of electromagnetic flowmeters are generally above 5D, and the straight pipe section parameters of ultrasonic flowmeters are generally 10D. -20D.

2.3 Consider the surrounding environmental conditions when selecting models

When selecting a flow meter, you need to conduct an on-site inspection to understand the on-site environmental conditions and select a suitable flow meter based on actual needs.

2.4 Refer to the control system requirements when selecting models

Generally, flowmeters commonly used in the water industry need to be able to display flow conditions normally and output flow signals. With the application of information technology in the tap water industry, the control system has become more scientific. There are also differences in the flow meter protocols equipped with different communication technologies. Therefore, our water companies need to refer to the usage requirements of the control system when selecting flow meters.

3 Flow meter detection and correction

The flow meter also has its own service life. Long-term use will inevitably cause loss, resulting in a certain use error in the flow meter measurement value. Therefore, Water companies need to regularly test flow meters and make timely corrections if deviations occur. However, my country's relevant regulations on flow meter testing and calibration are not perfect enough. Our relevant units should issue some relevant policies as soon as possible and run them point by point. During the operation process, according to the problems that arise and the actual needs of different regions Modifications and supplements will be made, and the relevant provisions revised in the future will be reported to the relevant departments to form standards. haveSome flowmeters have been operating normally during use and the test results meet the requirements, so they should be tested and calibrated every year. In particular, some flowmeters do not use standard tubes, and the inner tube diameter may become smaller during use, resulting in The flow meter measurement data deviates from the actual data. The flow meter problems caused by the smaller inner pipe diameter are generally difficult to inspect using portable ultrasonics.

The flow meter detection method is mainly: the flow meter used by the water company is compared with the standard flow meter. However, the standard flow meter is generally about 2-higher than the flow meter used by the water company. 3 levels. In addition, a flowmeter calibration device can be established to detect the accuracy of the flowmeter. You can also use the clean water tank volume calibration method for flow meter verification.

4 Management and maintenance of flow meters

4.1 Management of flow meters

The management of flow meters mainly involves remote detection and correction of flow meters , flow meter data management and maintenance of flow meters. In recent years, with the rapid development of electronic technology, remote monitoring has developed into the current data remote transmission such as GPRS, GSM, and ADSL.

When managing different types of flow meters, you need to pay attention to the following issues: First, you must be familiar with the specific operating instructions of the flow meter before using and maintaining the flow meter. Second point, the insertion turbine flowmeter should set the minimum value and the maximum value corresponding to the instrument coefficient K value. The third point is that when debugging the electromagnetic flowmeter, you need to enter the correct flow value corresponding to the instrument calibration coefficient GK value. The fourth point is that the use of ultrasonic flowmeters requires measuring pipeline data, recording materials, and inputting them into the flowmeter host. After writing the program code through the flowmeter host, the equipment is installed based on the results of the flowmeter calculations and the installation quality is ensured.

4.2 Maintenance of flow meters

Precautions for maintenance of different types of flow meters: point, for online flow meters, the surface of the meter must be clean and good The flowmeter must be dust-proof and the flowmeter maintenance and identification work can only be carried out after saving the pre-identification data information. The second point is that after use, the portable flow meter needs to be carefully wiped and maintained, and the storage environment needs to be selected in accordance with regulations. The third point is to regularly check the sealing condition of the plug-in vortex flowmeter sensor to ensure that it is not faulty and requires regular maintenance. The fourth point is to perform regular calibration and maintenance of the flow meter.

5 Application of flow meters in the tap water industry

5.1 Use flow meters to measure users’ water consumption

Water companies generally charge users corresponding fees based on the data displayed on the calculated water meters. cost. The general flow meter management level is: purchase the flow meter, record the flow meter calibration data information in detail, install the flow meter and put it into use, and perform calibration and maintenance of the flow meter. Measuring user water consumption is generally divided into large caliber and small caliber: for small caliber, it only needs to be collected regularly by mobile phone; for large caliber, GPRS system is required for data transmission, and abnormal alarm device is used for data transmission.Set up real-time monitoring of data.

5.2 Incorporate the use of flow meters and urban pipe networks into regional measurement

Install flow meters according to different areas, measure the surrounding water supply, and use water from this area Considering the volume recovery rate, flow meter testing is required. Use regional flow meters to decompose the recovery rate and provide basis for water companies from point to surface.

5.3 Calculate the water volume of water plants

Generally, water plants use flow meters (taking electromagnetic flowmeters as an example) to measure and measure water volume, which can effectively affect the production and production of enterprises. Management situation is controlled. The water inlet flow meter installed in the water plant can grasp the water volume data, which facilitates the water purification treatment and operation process control of the water plant, calculates various performance conditions of water purification treatment, and effectively controls water quality and investment costs. In addition, when the water suction pump room is operating normally, we generally use the inlet flow meter to detect whether there is abnormal flow, which can effectively detect problems with the unit. Factory flow meters can generally participate in dispatching the city's pipe network together with factory water pressure to ensure normal and stable water supply pressure.