Electromagnetic flowmeter empty pipe valve value adjustment method

1. Definition and function of electromagnetic flowmeter empty pipe threshold

Electromagnetic flowmeter is a commonly used flow measurement instrument and has been widely used in water, sewage treatment, chemical industry, pharmaceutical and other fields. . When using an electromagnetic flowmeter, measurement data errors may occur due to slow or interrupted flow of liquid in the pipeline. In order to avoid this situation, an empty pipe threshold function is added to the electromagnetic flowmeter.

The empty pipe threshold refers to the empty pipe signal that the electromagnetic flowmeter will output when the fluid speed in the pipeline is lower than the threshold. By setting the empty pipe threshold, air and sediment in the water pipe can be prevented from interfering with the normal operation of the instrument. Therefore, correctly setting the empty pipe threshold is very important for the normal operation of the electromagnetic flowmeter.

2. Adjustment method of empty pipe threshold

1. Determine the type of fluid in the pipeline and select the appropriate empty pipe threshold range. Generally speaking, the threshold range of water is 0.5-2m/s, and the threshold range of air is 10-20m/s.

2. Enter the setting mode on the electromagnetic flowmeter display and find the "empty pipe threshold" option.

3. Set an appropriate empty pipe threshold according to the fluid type and pipe size. The specific operation method is to directly input the value according to the prompts on the display screen or set it through the regulator knob.

4. After adjusting the empty pipe threshold, conduct repeated testing and confirmation to ensure that the setting is correct.

3. Issues that need attention

1. The empty pipe threshold must adapt to the pipe where the flow meter is located. Setting the threshold too high will lead to large errors, while setting it too low will not Conducive to stable measurement.

2. When adjusting the empty pipe threshold, make sure there are no interfering factors such as bubbles and impurities in the pipeline, otherwise it will affect the accurate setting of the threshold.

3. The empty pipe threshold is only set to prevent the occurrence of air and interference in the pipeline. It cannot solve the errors caused by electromagnetic flowmeters due to factors such as temperature, pressure, and flow fluctuations.

4. During subsequent use and maintenance, it is necessary to regularly check the suitability of the empty pipe threshold and other parameters, and make timely adjustments and replacements.

In short, correctly adjusting the empty pipe threshold of the electromagnetic flowmeter is the basis for ensuring measurement accuracy. Before use, users need to understand the properties and actual conditions of the fluid in the pipeline, and set the threshold according to the actual conditions. At the same time, during operation, attention should also be paid to avoiding some common problems and maintaining the stability and accuracy of the electromagnetic flowmeter.