8F3B Mass Flow Meter Overview
8F3B mass flow meter is a direct mass flow measurement instrument based on the Coriolis principle, widely used in petroleum, chemical, pharmaceutical, food, and other industries. It can directly measure the mass flow, density, and temperature of fluids without additional temperature and pressure compensation. This article provides a download of the 8F3B Chinese manual and organizes key technical information for selection and operation and maintenance reference.
Download 8F3B Chinese Manual.pdf
Working Principle and Core Advantages
Coriolis Force Measurement Principle
When fluid flows through the vibrating measuring tube, the Coriolis force causes a phase difference in the tube, which is proportional to the mass flow rate. 8F3B directly outputs mass flow and density values by detecting the phase difference and vibration frequency. The measurement process is not affected by fluid temperature, pressure, viscosity, or flow velocity distribution.
Main Technical Advantages
- Direct mass flow measurement: No temperature and pressure compensation required, high accuracy.
- Multi-parameter output: Can simultaneously measure mass flow, volumetric flow, density, and temperature.
- Wide turndown ratio: Typical turndown ratio can reach 100:1, adapting to working conditions with large flow fluctuations.
- High reliability: No moving parts, low maintenance, suitable for harsh environments.
Technical Parameters and Selection Comparison
Key Performance Parameters
| Parameter Item | Typical Value | Description |
|---|---|---|
| Mass flow accuracy | ±0.1% ~ ±0.2% | Depends on model and working conditions |
| Density accuracy | ±0.001 g/cm³ | Used for concentration/composition measurement |
| Medium temperature range | -50°C ~ +200°C | High-temperature version can be extended |
| Nominal diameter | DN15 ~ DN150 | Select according to flow range |
| Output signal | 4-20mA, pulse, HART, Modbus | Optional bus protocol |
| Protection class | IP67 / IP68 | Optional explosion-proof version |
Selection Steps
- Confirm the name, temperature, pressure, and corrosiveness of the measured medium.
- Determine the nominal diameter based on the minimum/maximum mass flow rate, ensuring the common flow rate is within 20%~80% of the range.
- Select wetted materials (such as 316L, Hastelloy) and process connection method.
- Determine the output signal, power supply, and explosion-proof grade.
- Refer to the flow range table in the 8F3B manual for final verification.
Installation and Commissioning Points
Installation Precautions
- The flow meter should be installed at a location with minimal vibration in the pipeline to avoid strong mechanical vibration.
- Ensure the pipeline is filled with fluid to avoid bubble accumulation; vertical or horizontal installation is recommended.
- Sufficient straight pipe sections must be reserved upstream and downstream (typically 5D upstream and 3D downstream); refer to the manual for details.
- For easily vaporizing media, back pressure should be increased to prevent flashing.
Commissioning Process
- Check that wiring is correct and the power supply voltage meets the nameplate requirements.
- After power-on, wait for warm-up, enter zero calibration mode, and ensure the pipeline is full and there is no flow.
- Set parameters such as density and temperature coefficient according to the medium.
- Introduce fluid, compare with standard values to verify accuracy, and fine-tune if necessary.
- Record commissioning data and file for future reference.
Maintenance and Fault Handling
Daily Maintenance
- Regularly check zero stability; calibration every 3~6 months is recommended.
- Keep the sensor exterior clean and check whether the cable seal is intact.
- For easily scaling media, regularly clean the measuring tube to avoid affecting vibration characteristics.
Common Faults and Countermeasures
| Fault Phenomenon | Possible Cause | Handling Method |
|---|---|---|
| Zero drift | Pipeline vibration, installation stress, two-phase flow | Re-fix the pipeline, perform zero calibration |
| Large measurement fluctuation | Bubbles, pulsating flow, valve interference | Vent, increase damping, adjust installation position |
| No output signal | Power failure, wiring error | Check power and wiring, troubleshoot according to the manual |
| Abnormal density value | Tube wall scaling, temperature influence | Clean the measuring tube, check temperature compensation settings |
Summary and Documentation Download
8F3B mass flow meter, with its direct mass measurement, high accuracy, and multi-parameter output, has become a preferred solution for industrial flow measurement. Correct selection, standardized installation, and regular maintenance are key to ensuring long-term stable operation. For complete technical details, please click the link above to download the 8F3B Chinese Manual.pdf to obtain detailed parameters, dimension drawings, and wiring diagrams.