Working principle of ifm SM8000 electromagnetic flowmeter

Ifm electromagnetic flowmeter SM8000 product introduction:

SMR11GGXFRKG/US-100

Accurately measures flow, consumption and medium temperature

High sensitivity, High repeatability and high measurement dynamics

With switching output, analog output and pulse output

Clearly visible 4-digit LED display

ifm SM8000 Working principle of electromagnetic flowmeter:

Electromagnetic flowmeter is a flowmeter that measures flow based on Faraday's law of electromagnetic induction. The advantage of electromagnetic flowmeter is that the pressure loss is extremely small and the measurable flow range is large. The ratio of the maximum flow rate to the minimum flow rate is generally more than 20:1. It is suitable for a wide range of industrial pipe diameters, up to 3m. The output signal is linear with the measured flow rate. It has high accuracy and can measure conductivity ≥5μs/cm. Fluid flow of acids, alkalis, salt solutions, water, sewage, corrosive liquids, and mud, pulp, pulp, etc. But it cannot measure the flow of gas, steam and pure water.

When a conductor moves cutting magnetic field lines in a magnetic field, an induced electric potential will be generated in the conductor. The size of the induced electric potential depends on the effective length of the conductor in the magnetic field and the direction of movement of the conductor perpendicular to the direction of the magnetic field. Directly proportional to speed. In the same way, when the conductive fluid flows vertically in the magnetic field and cuts the magnetic induction force lines, it will also generate induced potential on the electrodes on both sides of the pipe.

How to use the SM8000 ifm electromagnetic flowmeter:

The electromagnetic flowmeter has two operating states: automatic measurement state and parameter setting state.

When the meter is powered on, it automatically enters the measurement state. In the automatic measurement state, the electromagnetic flowmeter automatically completes each measurement function and displays the corresponding measurement data. In the parameter setting state, the user uses four panel keys to complete the instrument parameter setting.

1. Key function

1.1 Down key function in automatic measurement state

Down key: cycle through the lower display content of the screen;

Up Key: Cycle through the upper row display content on the screen;

Composite key + Confirm key: Enter the parameter setting state;

Confirm key: Return to the automatic measurement state;

Measurement In this mode, the contrast of the LCD display is adjusted: for small LCDs, press "composite key + up key" or "composite key + down key" for a few seconds; for large LCDs, adjust the potentiometer on the back of the large LCD.

1.2 Down key function in parameter setting state

Down key: The number at the cursor decreases by 1;

Up key: The number at the cursor increases by 1;

Composite key + down key: move the cursor to the left;

Composite key + up key: move the cursor to the right;

Confirm key: enter/exit the submenu;

Confirm key: In any state, press it continuously for two seconds to return to the automatic measurement state.

Note: 1. When using the "composite key", you should first press the composite key and then press and hold the "up key" or "up key" at the same time.

2. In the parameter setting state, if there is no key operation within 3 minutes, the instrument will automatically return to the measurement state.

3. To select the flow direction for flow zero point correction, you can move the cursor to the leftmost "+" or "-" and use the "up key" or "down key" to switch it to the opposite direction to the actual flow direction.

4. To select the flow unit, move the cursor to the originally displayed flow unit in the "Flow Range Setting" menu, and then use the "up key" or "down key" to switch to suit your needs.

2. Parameter setting function key operation

To set or modify the parameters of the electromagnetic flowmeter, the flowmeter must enter the parameter setting state from the measurement state. In the measurement state, press the "composite key + confirm key" to display the state transition password (0000). According to the confidentiality level, modify it accordingly according to the password provided by the manufacturer. After pressing the "composite key + confirmation key" again, it will enter the required parameter setting state.

Installation of intelligent electromagnetic flowmeter sensors on process pipelines

1. The intelligent electromagnetic flowmeter must be filled with medium when detecting blocked pipes at any time, and cannot be used when the pipe is full or empty. It works normally under the condition of tube. When the medium is not full in the pipe, the method of raising the height of the outlet pipe at the rear end of the flow meter can be used to fill the pipe with medium to prevent the pipe from being full and gas from adhering to the electrode.

2. Vacuum in the pipeline will damage the lining of the flow meter, so special attention is required.

3. The positive direction of flow should be consistent with the positive direction pointed by the arrow on the flow meter.

4. The intelligent electromagnetic flowmeter can be installed on straight pipes, or on horizontal or inclined pipes, but it requires the center line of the two electrodes to be horizontal.

5. For liquid and solid two-phase fluids, it is better to install it vertically so that the measured medium flows from top to bottom, which can make the flow meter lining wear evenly and extend the service life.

6. Ensure there is enough space near the pipe flange for flowmeter installation and maintenance.

7. If the measuring pipe vibrates, there should be fixed supports on both sides of the flow meter.

8. If the measuring medium is a heavily polluted liquid, install the flowmeter body in the bypass pipeline to drain and clear the flow without interrupting the process operation.

9. When installing a PTFE-lined flow meter, the bolts connecting the flange should be tightened evenly, otherwise the PTFE lining will be easily crushed. It is best to use a torque wrench.