Global Water WL750 Ultrasonic Water Level Transmitter

Overview

The Global Water WL750 Ultrasonic Water Level Transmitter is an industrial-grade, non-contact level measurement device engineered for precision and reliability in demanding liquid and granular solid applications. Utilizing time-of-flight ultrasonic pulse-echo principle, the WL750 emits high-frequency acoustic waves (typically 50 kHz) toward the surface of the medium and calculates distance based on the elapsed time between emission and echo return. Its narrow 8° beam angle ensures minimal signal dispersion—critical for accurate measurements in confined vessels, narrow tanks, or open-channel flumes where sidewall interference must be avoided. Designed for short-range applications, the WL750 offers two selectable measurement spans: 0.2–1.3 m and 0.3–2.3 m—optimized for wastewater sumps, chemical dosing tanks, rainwater harvesting cisterns, and laboratory-scale process vessels. The integrated design combines transducer, electronics, and backlit graphical LCD into a single compact unit, enabling local readout without external instrumentation while maintaining full analog and digital output capability.

Key Features

• Integrated transducer and display unit with graphical backlit LCD and dual-color LED status indicators
• Narrow 8° ultrasonic beam angle and slender 35 mm chemically resistant process tip for installation in tight spaces
• IP67-rated stainless steel and tempered glass housing with PET 30% GV + epoxy wetted components for broad chemical compatibility
• Configurable analog outputs: 4–20 mA (2-wire loop-powered) or 0–10 V (with 500 Ω load resistor)
• Dual programmable switch outputs (S1 & S2) supporting PNP or NPN logic, rated to 300 mA per channel
• User-adjustable hysteresis, alarm thresholds, damping, and linearization settings via intuitive on-device menu navigation
• M12×1, 5-pin locking connector for robust, vibration-resistant cable attachment; standard cable lengths: 5 m and 10 m (custom lengths available)
• 3-bolt mounting flange (2.75″ / 69.85 mm) with adjustable orientation screws for precise sensor alignment

Sample Compatibility & Compliance

The WL750 is suitable for continuous level monitoring of clean to moderately turbid liquids—including water, wastewater, acids, alkalis, and organic solvents—as well as free-flowing dry solids such as sand, gravel, and plastic pellets. Its chemically inert wetted materials (PET-reinforced epoxy) resist corrosion from common industrial media, eliminating drift caused by coating or buildup in low-viscosity applications. The device complies with CE marking requirements under the EU Electromagnetic Compatibility (2014/30/EU) and Low Voltage (2014/35/EU) Directives. While not certified for SIL or ATEX environments, its IP67 ingress protection ensures reliable operation in humid, washdown, or outdoor installations subject to temporary submersion or heavy condensation. It meets general-purpose industrial environmental standards referenced in IEC 60529, IEC 61000-6-2 (immunity), and IEC 61000-6-4 (emissions).

Software & Data Management

The WL750 operates autonomously without external software dependency; all configuration is performed locally via push-button navigation on the integrated LCD interface. Parameter settings—including zero/span calibration, alarm setpoints, output scaling, and switching logic—are stored in non-volatile memory and retained during power loss. Though it lacks Ethernet, Modbus, or wireless connectivity, its 4–20 mA output is compatible with industry-standard SCADA systems, PLC analog input modules (e.g., Siemens S7, Allen-Bradley CompactLogix), and data loggers compliant with IEC 61131-3 analog signal conventions. For auditability in regulated environments, configuration changes are timestamped and visible on-screen—supporting basic GLP-aligned documentation practices. While not FDA 21 CFR Part 11 compliant out-of-the-box, its deterministic behavior and stable analog output facilitate integration into validated systems when paired with appropriate system-level controls.

Applications

• Wastewater lift station sump level monitoring with pump control interlock
• Chemical feed tank level supervision in water treatment plants
• Stormwater detention basin and irrigation reservoir level tracking
• Lab-scale reactor and reagent storage vessel monitoring
• Industrial coolant reservoirs and hydraulic fluid tanks
• Open-channel flow estimation using calibrated weir or flume geometry
• Material level detection in silos handling dry bulk solids (e.g., polymer beads, catalyst pellets)

FAQ

What is the maximum recommended operating temperature for the WL750?
The WL750 is rated for continuous operation between 0 °C and 70 °C ambient temperature. Surface temperatures exceeding 70 °C may affect transducer performance and LCD readability.

Can the WL750 measure through foam or heavy vapor layers?
No. Foam, steam, or dense condensation attenuates ultrasonic energy and causes signal loss or false echoes. It is intended for clear-air path applications only.

Is field recalibration possible without specialized tools?
Yes. Zero and span adjustments can be performed manually using the front-panel buttons and known reference levels—no PC or service software required.

What cable options are available for the M12 connector?
Standard configurations include 5 m and 10 m pre-terminated PUR-jacketed cables with molded M12 plugs. Custom lengths up to 50 m are available upon request; note that longer cables may require voltage drop verification for 4–20 mA loop integrity.

Does the WL750 support HART communication?
No. The WL750 provides only analog (4–20 mA / 0–10 V) and discrete (PNP/NPN) outputs. It does not implement HART, Modbus RTU, or other digital protocols.