Overview of Electromagnetic Flowmeter 5H2B
Electromagnetic flowmeter 5H2B is a flow measurement instrument based on Faraday's law of electromagnetic induction, suitable for volumetric flow measurement of conductive liquids. It offers high measurement accuracy and fast response, and is widely used in water treatment, chemical, metallurgy, papermaking, and other industries. Based on the 5H2B manual, this article summarizes key technical and usage points.
Download 5H2B Chinese Manual.pdf
Working Principle and Core Advantages
Measurement Principle
When a conductive liquid flows through a magnetic field, it cuts the magnetic lines of force and generates an induced electromotive force, the magnitude of which is proportional to the flow velocity. The 5H2B detects this electromotive force through electrodes and, after processing by the converter, outputs a standard signal to achieve flow measurement.
Main Advantages
- No obstructing parts, extremely low pressure loss, and significant energy-saving effect.
- High measurement accuracy, with typical accuracy up to ±0.5% of reading.
- Wide range of applicable media, capable of measuring acid, alkali, salt solutions, slurries, etc.
- Bidirectional measurement, supporting forward and reverse flow measurement.
Key Technical Parameters
During model selection, the following parameters should be focused on to ensure the instrument matches the working conditions. For specific values, please refer to the 5H2B manual.
| Parameter Item | Typical Range/Description |
|---|---|
| Nominal Diameter | DN10~DN2000 |
| Accuracy Class | ±0.5% of reading (optional ±0.2%) |
| Medium Conductivity | ≥5μS/cm |
| Working Pressure | ≤4.0MPa (high pressure customizable) |
| Medium Temperature | -20℃~+180℃ (depending on lining material) |
| Output Signal | 4-20mA, pulse, RS485 |
| Protection Class | IP65/IP68 |
Installation Steps and Precautions
Installation Steps
- Confirm that the pipe inner diameter matches the flowmeter nominal diameter, and check whether the flange standard matches.
- Select a straight pipe section position with full pipe and no bubbles, with upstream straight pipe section ≥5D and downstream straight pipe section ≥3D.
- Slowly lower the flowmeter into the pipeline, ensuring that the arrow direction is consistent with the medium flow direction.
- Evenly tighten the flange bolts to avoid lining deformation or leakage.
- Connect the grounding wire to ensure the sensor and pipeline are at the same potential, reducing interference.
- After power-on, check the zero point and, if necessary, set low signal cutoff.
Precautions
- Avoid installation at the suction end of a pump or locations prone to negative pressure.
- During horizontal installation, the electrode axis should be approximately horizontal to prevent sediment from covering the electrodes.
- When the medium conductivity is too low, special electrodes or adjusted installation methods are required.
- In strong electromagnetic interference environments, shielded cables should be used and kept away from high-power equipment.
Commissioning and Maintenance Points
Commissioning
After power-on, enter the parameter setting menu and set the nominal diameter, range, output mode, etc., according to the 5H2B manual. It is recommended to calibrate the zero point under full-pipe static conditions and record the initial parameters.
Daily Maintenance
- Regularly inspect the electrode surface and remove scaling or attachments.
- Calibrate the zero point and range every six months to ensure measurement accuracy.
- Check grounding and cable insulation to prevent signal drift.
- When not in use for a long time, drain the pipeline and dry the sensor.
Common Problems and Solutions
| Symptom | Possible Cause | Suggested Action |
|---|---|---|
| No flow signal | Medium not conductive or electrode contaminated | Check conductivity, clean electrodes |
| Large indication fluctuation | Bubbles, poor grounding, or interference | Vent air, re-ground, shield cables |
| Zero point drift | Pipeline not full or electrode scaling | Ensure full pipe, clean electrodes |
Summary
Correct model selection, standardized installation, and regular maintenance are key to the long-term stable operation of the electromagnetic flowmeter 5H2B. Engineering personnel are advised to read the 5H2B manual in detail and keep complete technical files for troubleshooting and spare parts procurement. If you need the complete manual, please click the link above to download.