DP Ultrasonic Level Transmitter: Non-Contact Level Measurement for Large Tanks and Open Environments/7410/8520
Introduction
The DP is a long-range ultrasonic level transmitter with multiple configurable ranges from 5 m to 50 m, making it suitable for both standard and large-scale applications. It operates with approximately ±1% FS measurement accuracy, reflecting a deliberate engineering trade-off: prioritizing measurement distance and signal robustness over high-precision short-range accuracy.
The device includes a variable blind zone (≈0.3 m to 2.5 m depending on range), which increases with measurement distance—a typical characteristic of long-range ultrasonic systems. It supports both two-wire and four-wire 4–20 mA outputs, along with relay outputs, enabling integration into conventional control systems as well as standalone monitoring setups. With low power consumption (<1.5W) and standard industrial protection (IP65), the SUP-DP is suitable for continuous field operation across a wide range of environments.
Working principle
The DP uses ultrasonic time-of-flight measurement, optimized for long-distance signal transmission. The sensor emits a high-frequency ultrasonic pulse toward the material surface. The reflected signal is received and processed to calculate distance:
Distance = (Sound velocity × Time delay) ÷ 2
At longer ranges, signal attenuation becomes a key issue. The SUP-DP addresses this through:
- Stronger transmitted pulse energy
- Signal processing tuned for long-distance echo recognition
- Adaptive measurement across different range configurations
Compared to short-range models, the emphasis here is not on ultra-fine resolution, but on reliable echo detection over extended distances.
Key features
The DP level calculating device is engineered around range capability, structural flexibility, and stable output, rather than precision-focused measurement.
- Extended Measurement Range (Up to 50 m): Designed for large tanks, reservoirs, and open spaces where standard ultrasonic transmitters cannot reach.
- Multiple Range Configurations (5–50 m): Flexible selection allows the same product series to adapt to different project scales.
- Dual Output Modes (2-wire / 4-wire 4–20 mA): Supports both loop-powered systems and independent powered installations.
- Relay Outputs for Alarm or Control: Integrated relay outputs enable direct high/low-level control without additional controllers.
- Wide Power Supply Options: Supports 24V DC and optional 220V AC, making it suitable for different site conditions.
- Industrial Temperature Tolerance: Operates reliably in environments from -20°C to +80°C (probe).
- Low Power Consumption: Designed for continuous operation with minimal energy usage (<1.5W).
Specification
| Product | Ultrasonic level transmitter |
| Model | DP |
| Measure range | 5m、10m、15m、20m、30m、40m、50m |
| Blind zone | ＜0.3-2.5m（different for range） |
| Accuracy | 1% |
| Display | LCD |
| Output (optional) | Four-wire 4～20mA/510Ωload |
| Two-wire 4～20mA/250Ω load | |
| 2 relays (AC 250V/ 8A or DC 30V/ 5A ) | |
| Temperature | LCD: -20～+60℃; Probe: -20～+80℃ |
| Power supply | 24VDC (Optional: 220V AC+15% 50Hz) |
| Power consumption | <1.5W |
| Protection degree | IP65 |
Applications
The DP ultrasonic level transmitter is best suited for large-scale and long-distance level monitoring scenarios, where measurement range is the primary challenge.
Water reservoirs and storage tanks
Monitoring water levels in large municipal or industrial storage systems of different water and wastewater treatments.
Wastewater treatment basins
Applicable for deep tanks and open structures where non-contact measurement is required.
River, dam, and open channel monitoring
Suitable for environmental and hydrological level measurement.
Bulk material silos (large capacity)
Used in industries handling grain, cement, or aggregates with high storage volumes.
Industrial utility systems
Level monitoring in large process tanks across power plants, mining, and infrastructure projects.
