Compact Ultrasonic Level & Distance Sensor (4–20mA / RS485 Modbus) | SUL801A
The SUL801A is a compact, cost-effective industrial ultrasonic level transmitter designed for reliable non-contact level and distance measurement in water, fuel, and diesel tanks. Featuring a rugged IP67 Polypropylene/ABS body with an M68×2 mounting thread, it offers seamless integration into industrial automation systems via simultaneous 4–20mA analog and RS485 Modbus-RTU outputs.
Key Features:
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Dual Signal Output: Simultaneous 4–20mA analog and RS485 Modbus-RTU digital output.
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Multiple Range Options: Available in 2.5 m, 5 m, 10 m, and 15 m measuring ranges.
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Compact & Rugged: Compact M68×2 thread design with IP67 protection class.
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High Precision: Accuracy of up to ±0.5% F.S. with automatic temperature compensation.
Description
Reliable Non-Contact Level Measurement for Tanks & Vessels
The SUL801A Compact Ultrasonic Level Sensor provides high-precision, non-contact liquid level and distance measurement without moving parts, making it completely maintenance-free. Built with an integrated temperature sensor and advanced digital filter algorithms, the SUL801 compensates automatically for temperature fluctuations (0 – 50 °C) and ambient electromagnetic interference, delivering stable readings in both open channels and sealed tanks.
Dual Communication & Seamless System Integration
Equipped with both 4–20mA current loop and RS485 (Modbus-RTU) outputs, the SUL801 connects directly to PLCs, Variable Frequency Drives (VFDs), digital indicators, or IoT dataloggers. Configurable baud rates (1200 to 115200 bps) ensure smooth compatibility with established SCADA networks and industrial controllers.
Typical Applications
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Fuel & Diesel Tanks: Precision level tracking for generator day tanks, fleet fuel storage, and distribution vessels.
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Water & Wastewater: Water storage tanks, pump station control, surge tanks, and open channel monitoring.
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Industrial Automation: Conveyor distance tracking, object height detection, and batch vessel monitoring.
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Agriculture & Irrigation: Remote water reservoir monitoring and livestock watering systems.
Features
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Measuring range up to 15 m for water, fuel, and chemical tanks
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Non-contact ultrasonic technology – no risk of contamination
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High accuracy (≤ ±0.5% F.S.) with small blind zone of only 150 mm
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Resistant to electromagnetic interference and environmental disturbances
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Fast response time with self-recovery after power-off
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IP67–IP68 protection class for harsh environments
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Easy integration with 4–20 mA, 0–10 V, or Modbus outputs
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Maintenance-free design with no moving parts
Specification
| Range | 2.5m, 5m, 10m,15m, others on request |
| Blind Area | 4-20mA/0-5v(2.5m/5m):≤200mm
4-20mA/0-5V(10m):≤300mm 4-20mA/0-5V(15m):≤500mm |
| Output | 4-20mA(3 wires)&RS485 Modbus RTU; 0-5V(3 wires)&RS485 Modbus RTU Optional |
| Power Supply | DC 24V(default); DC 12V(by customized) |
| Accuracy | 0.5%F.S (typical), 0.25%F.S (by customized) |
| Operating temp. | -10~50℃(-40~80℃ by customized) |
| IP rating | IP67 typical, IP68 by customized |
| Installation mode | Nut clamping fixed installation, screw-in installation, M68×2 |
| Product material | Polypropylene + glass fiber |
FAQ
1. What liquids can the SUL801A measure?
It can measure water, fuels (diesel, gasoline, heating oil), chemicals, and other common liquids.
2. Can the SUL801A be used outdoors?
Yes, thanks to its robust IP67–IP68 design, it works reliably in outdoor environments such as rivers, reservoirs, and industrial sites.
3. What output signals are available?
The SUL801A supports 4–20 mA, 0–10 V, and Modbus for easy system integration.
4. Is it maintenance-free?
Yes, the non-contact design and absence of moving parts ensure minimal maintenance and a long service life.
