FMU95 Ultrasonic Level Transmitter Overview
FMU95 is a high-performance ultrasonic level transmitter, widely used for level and material level measurement in industrial process control. It adopts a non-contact measurement principle and is suitable for corrosive, viscous, and easily crystallizing media.
This manual is the DP version Chinese handbook, detailing the installation, wiring, configuration, commissioning, and maintenance methods of the instrument. Users can download the complete PDF document via the link at the end of the article.
Product Features and Core Advantages
- Non-contact measurement: avoids medium contamination and wear, suitable for various complex working conditions.
- High precision and stability: adopts advanced echo processing technology, measurement accuracy up to ±0.2% FS.
- Wide range: maximum range up to 20 meters, meeting the needs of different tanks and pools.
- Multiple output signals: supports 4-20mA HART, PROFIBUS PA, FF, and other fieldbus protocols.
- Easy installation and commissioning: equipped with local display and buttons, supports remote configuration.
Technical Parameters Overview
| Parameter | Specification |
|---|---|
| Measurement principle | Ultrasonic echo ranging |
| Range | 0~20 m (optional) |
| Accuracy | ±0.2% FS |
| Output signal | 4-20mA HART / PROFIBUS PA / FF |
| Process connection | G1½A / 1½NPT / flange |
| Process temperature | -40~+80°C |
| Process pressure | -0.2~+4 bar |
| Protection class | IP67 / NEMA 4X |
| Power supply | Two-wire 24V DC |
Installation and Commissioning Steps
Installation Precautions
- Ensure the probe is perpendicular to the medium surface, avoid installation near the feed inlet or agitator.
- Keep a distance not less than the blind zone between the probe and the highest liquid level.
- Avoid direct sunlight or severe temperature changes; install a sunshade if necessary.
Commissioning Process
- After power-on, check whether the local display is normal.
- Enter the menu and set the empty tank height and full tank height.
- According to the medium characteristics, adjust the echo threshold and interference suppression parameters.
- Perform false echo suppression (Mapping) to eliminate fixed obstacle interference.
- Verify whether the output current is consistent with the host computer display.
Common Problems and Maintenance
- Fluctuating measurement values: check whether the probe is scaled, clean the surface; confirm there is no stirring or foam interference.
- No echo signal: check whether the installation position is reasonable and whether the medium is too low.
- Abnormal output current: check the supply voltage and loop load resistance.
Regularly cleaning the probe and checking the aging of the sealing ring can extend the service life of the instrument. For more detailed instructions, please download the complete Chinese manual.
Click to download FMU95 Ultrasonic Level Transmitter Chinese Manual DP Version.pdf