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Notes on split electromagnetic flowmeter

2020-10-14
The electromagnetic flowmeter is composed of two parts: the converter and the sensor, so the electromagnetic flowmeter is divided into two types of structure: integrated and separated. Split electromagnetic flowmeter can be used in specified explosion-proof places and occasions with special installation requirements. Today, the flowmeter manufacturer Q&T instrument mainly analyzes the following points for you to install and use the split electromagnetic flowmeter.

1. The sensor of the split electromagnetic flowmeter should be installed vertically, and the fluid should flow from bottom to top to meet the state of mixing the solid and liquid.
The reason is that the solid matter (sand, pebble particles, etc.) in the medium is prone to precipitation. In addition, if there are fish and weeds in the pipeline, the movement of fish in the pipeline will cause the output of the flowmeter to swing back and forth; the back and forth swing of the weeds hanging near the electrode will also cause the output of the flowmeter to be unstable. A metal filter is installed at the upstream inlet of the flowmeter to block fish and weeds from entering the measuring tube.
2. The split electromagnetic flowmeter prevents the negative pressure pipeline from being set incorrectly and will cause negative pressure in the sensor. When closing the upstream and downstream valves at the same time, if the fluid temperature is higher than the air temperature. It shrinks after cooling, causing the pressure in the tube to form a negative pressure. The negative pressure causes the lining to peel off from the metal conduit, causing electrode leakage.

3. Add a negative pressure prevention valve near the split electromagnetic flowmeter and open the valve to connect to atmospheric pressure to prevent negative pressure from being generated in the sensor. When a vertical pipeline is connected downstream of the split electromagnetic flowmeter, if the upstream valve of the flow sensor is used to close or adjust the flow, a negative pressure will be formed in the measuring pipe of the sensor. In order to prevent negative pressure, it is necessary to add back pressure or use a downstream valve to adjust and close the flow.
 
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