FMI51 Chinese Manual Download
FMI51 is a tuning fork level switch widely used in industrial process control for limit detection of liquids and bulk solids. To facilitate quick access to information for engineering technicians and procurement, this article provides the download entry for the FMI51 Chinese manual and summarizes the core technical points.
Download FMI51 Chinese Manual.pdf
FMI51 Product Overview
FMI51 adopts the tuning fork vibration principle, driven by a piezoelectric element to vibrate the tuning fork. When the fork body is covered by the medium, the vibration frequency changes, thereby outputting a switching signal. This instrument is suitable for high and low level alarms, pump control, overflow protection, and other scenarios.
Main Application Areas
- Limit detection of liquid storage tanks in the chemical and petrochemical industries
- Pump station control in water and wastewater treatment
- Sanitary level measurement in the food and beverage industry
- Full and empty alarm for bulk material silos
Core Advantages
- Maintenance-free: no moving parts, stable long-term operation
- Strong anti-interference: not affected by foam, bubbles, or dielectric constant
- Wide applicability: can measure various liquids and granular solids
- Flexible installation: supports various process connections and extension tube forms
Technical Parameters Overview
| Parameter | Typical Value |
|---|---|
| Measuring principle | Tuning fork vibration type |
| Process temperature | -40°C ~ +150°C |
| Process pressure | Max 40 bar |
| Output signal | Relay / PNP / NPN |
| Protection class | IP66 / IP67 |
| Process connection | Thread / Flange |
Installation and Commissioning Points
Installation Steps
- Confirm that the process connection specification matches the on-site interface
- Install the tuning fork body vertically or horizontally at the specified position on the tank
- Tighten the process connection to ensure sealing without leakage
- Wire and power on, observe the indicator light status
- Set sensitivity or delay parameters according to the medium type
Commissioning Precautions
- Avoid the fork body contacting the tank wall or agitator to prevent false alarms
- For horizontal installation, the fork body should be tilted downward about 15° to facilitate drainage
- For adhesive media, appropriately extend the response time
- After power-on, empty and full calibration is required
Selection and Procurement Recommendations
When purchasing FMI51, the selection should be comprehensively based on medium characteristics, process temperature and pressure, and explosion-proof requirements. It is recommended to first confirm the process connection specification and output signal type, and check whether Ex explosion-proof certification is required.
- Corrosive media: choose corrosion-resistant fork body material
- High-temperature conditions: choose high-temperature extension tube
- Explosion-proof areas: choose intrinsically safe or flameproof type
- Sanitary industry: choose sanitary process connection
For complete wiring diagrams, dimension drawings, and fault code descriptions, please download the FMI51 Chinese Manual above for detailed information.