I. 8A3C Mass Flowmeter Product Overview
8A3C mass flowmeter is a high-precision direct mass flow measurement instrument based on the Coriolis force principle. It can directly measure the mass flow, density, and temperature of fluids without the need for temperature and pressure compensation. This instrument is widely used in trade settlement and process control in industries such as petroleum, chemicals, pharmaceuticals, and food.
This concise manual aims to help engineering technicians and procurement personnel quickly understand the installation, wiring, parameter setting, and daily maintenance points of the 8A3C mass flowmeter. For complete technical information, please download the PDF document at the end of this article.
Download 8A3C Chinese Manual.pdf
II. 8A3C Mass Flowmeter Technical Parameters
The following are the core performance indicators of the 8A3C mass flowmeter, which can be used to verify working condition requirements during model selection and procurement.
| Parameter | Typical Value | Remarks |
|---|---|---|
| Mass flow accuracy | ±0.2% | Liquid conditions |
| Density measurement range | 0.2 ~ 3.0 g/cm³ | Higher ranges optional |
| Medium temperature | -50℃ ~ +200℃ | High-temperature models customizable |
| Output signal | 4-20mA / Pulse / RS485 | HART optional |
| Power supply | 24VDC or 220VAC | Depending on model |
III. 8A3C Mass Flowmeter Installation Guide
Correct installation is a prerequisite for ensuring the measurement accuracy of the 8A3C mass flowmeter. Please follow the steps below and pay attention to key points.
3.1 Installation Steps
- Confirm that there is no fluid flow in the pipeline, close the upstream and downstream valves, depressurize, and drain the pipeline.
- According to the flowmeter flange specifications, weld or install mating flanges on the pipeline, ensuring coaxiality.
- Gently push the flowmeter into the pipeline, evenly tighten the flange bolts to avoid deformation of the sensor due to excessive tightening on one side.
- For applications requiring density measurement, ensure that the flowmeter installation direction is consistent with the factory calibration direction.
- After installation, slowly open the valves and check for leaks.
3.2 Installation Precautions
- Avoid installing at the highest point of the pipeline to prevent gas accumulation from affecting measurement.
- Ensure full pipe condition. For liquid measurement, it is recommended to install at a low point or ascending pipe section.
- Keep away from vibration sources such as pumps and compressors; add supports if necessary.
- Reserve sufficient straight pipe sections, generally no less than 5D upstream and no less than 2D downstream (D is the pipe inner diameter).
- Observe the flow direction arrow to ensure the fluid direction matches the arrow on the housing.
IV. 8A3C Mass Flowmeter Electrical Wiring
The 8A3C mass flowmeter is usually available in remote or integral configurations, with terminal blocks located inside the transmitter. Please operate strictly according to the wiring diagram and ensure correct connection of power and signal lines.
4.1 Terminal Definitions
| Terminal No. | Function | Suggested Wire Color |
|---|---|---|
| 1 | Power positive (24VDC+) | Red |
| 2 | Power negative (24VDC-) | Black |
| 3 | 4-20mA output+ | Yellow |
| 4 | 4-20mA output- | Blue |
| 5 | Pulse/frequency output | White |
| 6 | RS485 A | Green |
| 7 | RS485 B | Brown |
4.2 Wiring Precautions
- Must disconnect power before operation to prevent damage to the transmitter circuit.
- Use shielded cables, with the shield grounded at one end, to improve anti-interference capability.
- Route signal cables separately from power cables to avoid parallel routing.
- Confirm that the supply voltage matches the nameplate to avoid overvoltage or undervoltage.
V. Common Faults and Handling of 8A3C Mass Flowmeter
During use, the 8A3C mass flowmeter may exhibit the following typical faults. Please refer to the table below for troubleshooting.
| Fault Symptom | Possible Cause | Handling Method |
|---|---|---|
| No output signal | Power not connected, fuse blown | Check power and fuse |
| Large measurement deviation | Pipe not full, bubbles, zero drift | Vent, recalibrate zero point |
| Abnormal density measurement | Sensor fouling, temperature effect | Clean sensor, check temperature compensation |
| Communication failure | Wiring error, address conflict | Check RS485 wiring and address settings |
VI. Maintenance and Care Recommendations
Regular maintenance can extend the service life of the 8A3C mass flowmeter and maintain measurement accuracy.
- Check the zero point every six months and calibrate if necessary.
- Inspect the sensor tube wall for corrosion or wear annually.
- Keep the transmitter housing clean to prevent dust accumulation affecting heat dissipation.
- When not in use for a long time, drain the pipeline and disconnect power, and take moisture-proof measures.
For more detailed fault codes and parameter settings, please download the complete version of "8A3C Chinese Manual.pdf".