Overview of Thermal Gas Mass Flow Meter 6I3B
Thermal Gas Mass Flow Meter 6I3B is a direct-reading mass flow instrument based on the thermal diffusion principle. It can directly measure gas mass flow without temperature and pressure compensation. It is widely used in industrial process control, environmental monitoring, energy metering, and other fields.
This article provides the download of the Chinese manual for this model and conducts a technical analysis around its principle, parameters, installation, and maintenance, facilitating engineering technicians and procurement personnel to quickly understand the product.
Download 6I3B Chinese Manual.pdf
Working Principle and Core Advantages
Thermal Diffusion Measurement Principle
The 6I3B uses two platinum resistance temperature sensors, one for heating and the other for measuring gas temperature. When gas flows through, heat is taken away from the heating sensor. By measuring the relationship between heating power and temperature difference, the mass flow rate of the gas can be calculated.
This principle directly reflects the number of gas molecules, so no additional temperature and pressure compensation is required, simplifying the system structure.
Main Technical Advantages
- Direct mass flow measurement: Not affected by temperature and pressure fluctuations, with high precision.
- Wide turndown ratio: Usually up to 100:1, adapting to different flow ranges.
- Good low flow rate response: Suitable for measuring tiny flows.
- Extremely low pressure loss: Almost no obstruction, good energy-saving effect.
- Easy installation: Supports insertion type and pipe section type.
Key Technical Parameters
The following are typical technical parameters of the 6I3B. Please refer to the manual for details.
| Parameter | Specification |
|---|---|
| Measuring medium | Common gases such as air, nitrogen, oxygen, natural gas, etc. |
| Turndown ratio | 100:1 |
| Accuracy | ±1% FS |
| Operating temperature | -20℃ ~ +60℃ |
| Operating pressure | ≤1.6 MPa |
| Output signal | 4-20mA, RS485, pulse |
| Power supply | 24VDC |
| Protection class | IP65 |
Installation and Commissioning Guide
Installation Steps
- Confirm the pipe size and flow direction, select a suitable installation location, and ensure the length of straight pipe sections before and after (usually 10D before and 5D after).
- For insertion type, drill a hole in the pipe and weld the base to ensure the sensor insertion depth is correct.
- Insert the sensor into the pipe, tighten the locking nut, and pay attention to sealing.
- Connect the power and signal lines, paying attention to correct polarity.
- After power-on, check whether the display is normal. If abnormal, troubleshoot according to the manual.
Commissioning Points
- Zero calibration: Perform under no-flow conditions to ensure the display is zero.
- Range setting: Set the output correspondence according to the actual flow range.
- Medium parameters: Set density or composition according to the gas type to improve accuracy.
- Filter time: Adjust according to working conditions to balance response speed and stability.
Common Issues and Maintenance
Common Fault Handling
- Large reading fluctuations: Check pipe vibration, unstable flow field, or sensor contamination.
- No output: Check power supply, wiring, and fuse.
- Measurement deviation: Recalibrate zero point and check medium parameter settings.
Daily Maintenance
- Regularly check whether the sensor surface has scale buildup. Clean with a soft cloth if necessary.
- Avoid long-term use in corrosive gases. If needed, choose a corrosion-resistant model.
- Perform calibration once a year to ensure accuracy.
Summary
Thermal Gas Mass Flow Meter 6I3B, with its direct mass flow measurement, wide turndown ratio, and low maintenance cost, has become an ideal choice for industrial gas metering. Correct installation, commissioning, and regular maintenance are key to ensuring long-term stable operation.
For complete operating details, please download the Chinese manual PDF above.