VEGAPULS 31 Radar Level Transmitter Overview
VEGAPULS 31 is an 80GHz frequency-modulated continuous-wave (FMCW) radar level transmitter launched by VEGA, specifically designed for continuous level measurement of liquids and bulk solids. Its compact structure, high measurement accuracy, and strong anti-interference capability make it widely used in chemical, water treatment, food and beverage, and other industries.
Based on the official Chinese manual, this article summarizes the core parameters, installation specifications, and commissioning procedures of the instrument, and provides a manual download link for quick reference by engineers and procurement personnel.
Download VEGAPULS 31 Chinese Manual.pdf
Core Technical Parameters
VEGAPULS 31 adopts 80GHz high-frequency radar technology with an extremely small beam angle, suitable for narrow containers or complex working conditions with agitators, heating coils, etc. The table below lists key performance indicators.
| Parameter | Typical Value/Range |
|---|---|
| Measurement Principle | 80GHz FMCW Radar |
| Measurement Range | Max 15 m (liquid) / 8 m (solid) |
| Measurement Accuracy | ±2 mm |
| Process Temperature | -40°C ~ +130°C |
| Process Pressure | -1 ~ +16 bar |
| Output Signal | 4~20 mA / HART, optional Modbus, Profibus PA |
| Protection Rating | IP66/IP67 |
| Process Connection | G¾, G1½, flange, etc. |
Installation Points and Precautions
Correct installation is the prerequisite for ensuring measurement accuracy. The following lists key installation specifications to avoid false echoes and signal attenuation.
- Installation Position: Keep as far away as possible from the feed inlet, agitator, and container inner wall to avoid direct exposure to interference sources.
- Beam Angle: The 80GHz beam angle is approximately 8°. During installation, ensure the beam covers the material surface and does not touch the tank wall.
- Flange/Thread Alignment: The antenna should be perpendicular to the material surface; inclined installation will cause echo deviation.
- Avoid Condensation: In conditions prone to condensation, it is recommended to use an antenna extension tube with purging or heating.
- Grounding: The instrument housing must be reliably grounded to prevent electromagnetic interference from affecting signal output.
Commissioning and Parameter Setting Steps
VEGAPULS 31 supports commissioning via display module, VEGA Tools App, or HART handheld communicator. The following is the basic commissioning process.
- Power-on Check: Confirm the supply voltage is 9.6~35 V DC and observe whether the instrument self-test passes.
- Set Medium: Select liquid or solid and enter the dielectric constant range (typically 1.9~80 for liquids).
- Set Measuring Range: Enter the empty tank height (E) and full tank height (F) to ensure the range covers actual level changes.
- Echo Curve Analysis: Use VEGA Tools to view the echo curve, identify the true level echo, and suppress false echoes.
- Output Calibration: Set 4mA for empty tank and 20mA for full tank to complete current output calibration.
After commissioning, it is recommended to save a parameter backup and record the echo curve as a reference for future maintenance.
Typical Applications and Selection Recommendations
VEGAPULS 31 is suitable for various industrial scenarios. When selecting, comprehensively consider medium characteristics, process conditions, and output requirements.
- Water Treatment: Measure liquid levels in sewage and clean water tanks, resistant to foam and steam interference.
- Chemical Storage Tanks: Suitable for corrosive media such as acid-base solutions and solvents; PTFE antenna required.
- Food and Beverage: Sanitary process connections meeting CIP/SIP cleaning requirements.
- Bulk Solids: Measure plastic pellets, flour, etc.; note the impact of dust on radar waves.
When selecting, please confirm process temperature, pressure, dielectric constant, and explosion-proof rating (e.g., ATEX, IECEx). Consult VEGA technical support if necessary.
Common Issues and Maintenance
Regular maintenance can extend instrument life and maintain measurement accuracy. Common issues and solutions are as follows:
- Fluctuating Measurement Values: Check whether the antenna has scaling or condensation, or adjust false echo suppression.
- No Signal Output: Confirm power supply and wiring, check fuse and HART communication.
- Decreased Accuracy: Recalibrate the range or check whether the antenna is covered by medium.
- Cleaning and Maintenance: Wipe the antenna with a soft cloth to avoid scratching the PTFE coating.
For complete technical documentation, please download the VEGAPULS 31 Chinese Manual, which includes detailed dimension drawings, wiring diagrams, and fault code tables.