Universal Ultrasonic Water Level Transmitter with Digital Display | SUL804A
The SUL804A is a heavy-duty, universal ultrasonic water level transmitter engineered for precision liquid level monitoring in municipal water plants, industrial tanks, and wastewater treatment systems. Featuring a high-definition local OLED/LCD display, the SUL804A delivers reliable non-contact measurement from 3 m up to 20 m with an accuracy of ±0.3% F.S.
Equipped with simultaneous 4–20mA analog output, RS485 Modbus-RTU, and optional dual relay alarm outputs, it provides complete control capability for pumps, valves, and remote monitoring systems.
Key Highlights:
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Local HD Display: Self-luminous OLED/LCD for real-time level and distance readout on-site.
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Flexible Outputs: Simultaneous 4–20mA, RS485 Modbus RTU, and programmable SPDT relay switches.
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High Precision: Accuracy of ±0.3% F.S. (optional ±0.2%) with dynamic digital echo filtering.
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Rugged Enclosure: IP65 die-cast aluminum/ABS head housing with IP68 waterproof sensor probe.
Description
Universal Ultrasonic Level Measurement for Industrial Water & Process Control
The SUL804A Ultrasonic Water Level Transmitter is built to withstand harsh outdoor and industrial environments. Utilizing non-contact ultrasonic echo technology paired with advanced digital signal processing algorithms, the sensor intelligently filters out agitator noise, vessel wall reflections, and foam interference to deliver stable, accurate readings.
On-Site Configuration & Tri-Signal Connectivity
Unlike compact blind transmitters, the SUL804A features an integrated keypad and backlit digital display, allowing technicians to configure measurement ranges, dampening times, and relay switching points directly on-site without needing specialized software or calibrators.
Its multi-signal output design ensures effortless integration:
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Analog Control: Direct 4–20 mA output to PLCs, chart recorders, or Variable Frequency Drives (VFDs).
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Digital Communication: RS485 Modbus-RTU interface for remote telemetry and SCADA integration.
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Direct Pump/Alarm Control: Programmable dual relay outputs for high/low level alarms or direct pump start/stop control.
Typical Applications
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Municipal Water & Sewage: Open channel flow, lift station wet wells, clean water reservoirs, and sewage treatment plants.
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Industrial Process Vessels: Chemical batch tanks, process water storage, and neutralization basins.
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Environmental & River Monitoring: Reservoir monitoring, flood control channels, and dam level management.
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Pump & VFD Automation: Automated pump switching based on high/low liquid thresholds.
Features
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Non-Contact Measurement: Completely immune to fluid scaling, chemical erosion, or mechanical wear.
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Local Keypad Programming: Complete range, unit, and relay setup directly from the front display panel.
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Advanced Echo Tracking: Smart false-echo suppression algorithm ensures reliable measurement near tank walls or obstructions.
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Automatic Temperature Compensation: Integrated temperature sensor guarantees measurement accuracy across seasonal temperature shifts.
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Dual Power Supply Options: Available in DC 12–24V or AC 220V power configurations.
Specification
| Parameter | Technical Specification |
| Model | SUL804A Universal Ultrasonic Level Transmitter |
| Measuring Ranges | 3 m, 5 m, 8 m, 10 m, 12 m, 15 m (custom options up to 20 m) |
| Accuracy | ±0.3% F.S. (standard), ±0.2% F.S. (high precision) |
| Display | High-definition self-luminous OLED or backlit LCD |
| Signal Outputs | 4–20 mA (4-wire) + RS485 Modbus RTU |
| Relay Outputs | 2 × SPDT Relays (programmable High/Low limit control) |
| Power Supply | DC 12–24V or AC 220V |
| Protection Rating | IP65 Housing / IP68 Sensor Probe |
| Operating Temperature | -20 °C to +60 °C (Transmitter head) |
| Process Connection | G1.5 / G2 thread or Flange Mounting |
FAQ
Q: Can the SUL804A directly trigger a pump without a PLC?
A: Yes. The SUL804A includes dual programmable relay switch outputs. You can program high-level and low-level threshold setpoints directly on the local display to automatically trigger pumps, motorized valves, or external alarm sirens without requiring an external PLC controller.
Q: What is the main advantage of SUL804A over the compact SUL801 model?
A: While the SUL801 is designed for tight spaces and compact tanks without on-site visual readouts, the SUL804A is a full-featured process instrument. It includes a local digital display head, extended measurement ranges (up to $20text{ m}$), higher overall accuracy ($0.3%$), relay alarm contacts, and both AC/DC power options.
Q: How does the SUL804A handle agitator blades or internal tank obstacles?
A: The SUL804A utilizes advanced digital echo-processing software to identify and ignore static obstacles like tank ladders or moving agitators, maintaining focus on the actual liquid surface echo.
