The electromagnetic flow meter only shows the cumulative volume; the instantaneous flow rate remains zero at all times. What could be the reason for this?

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1. The medium is non-conductive. 2. There is flow in the pipe, but it’s not in a full-bore condition. 3. There is no flow in the pipeline of the electromagnetic flowmeter. 4. The electrode is covered and does not come into contact with the liquid. 5. The flow rate is less than the lower limit for flow cut-off set in the header. 6. The parameters in the header are set incorrectly. 7. Sensor damage. To prevent problems, when selecting and installing an electromagnetic flowmeter, you need to pay attention to the following: First, clearly define your organization’s metering requirements. There are several key requirements that must be specified, including: the medium to be measured, flow rate in m³/h (minimum, operating point, maximum), medium temperature in °C, medium pressure in MPa, and installation type (flange-type or clamp-on type), etc. II. Prerequisites for selecting an electromagnetic flowmeter
1. The medium to be measured must be a conductive liquid (i.e., the fluid being measured is required to have a minimum level of electrical conductivity). 2. The medium to be measured should not contain much ferromagnetic material or a large number of bubbles. III. It is important to understand the measurement principle of electromagnetic flow meters. The measurement principle of pressure transmitters is based on Faraday’s law of electromagnetic induction: when a fluid flows through a magnetic field perpendicular to its direction of flow, an electrical voltage proportional to the average flow velocity (also known as volumetric flow rate) is induced due to the movement of the conductive fluid. This voltage signal is detected by two electrodes in direct contact with the fluid and transmitted via a cable to the display unit. The device features a fully Chinese-language menu system, making it easy and straightforward to operate – simple to use and easy to learn. The flow meter has digital communication signal outputs such as RS485, RS232, Hart, and Modbus. (Optional) Features self-check and self-diagnosis functions.