The YSI WL400 water level sensor from Global Water represents a significant advancement in hydrological monitoring technology. Designed specifically for demanding environments, this pressure transducer delivers unparalleled accuracy across a wide range of water monitoring applications.

The WL400 features several breakthrough design elements that address common challenges in water level measurement:

• "Wet-Wet" sensor technology: Eliminates the need for vent tubes, preventing measurement drift caused by clogging or leaks
• Dynamic temperature compensation: Maintains accuracy across temperature ranges from -40° to +185°F (-40° to +85°C)
• 304L stainless steel housing: Withstands depths up to 500 feet (152 meters) and protects against silt and debris
• Silicone diaphragm: Provides superior isolation between sensing elements and water while preventing long-term measurement drift

WE100 Barometric Pressure Transmitter

• Output: 4-20 mA
• Range: 800-1100 mb
• Accuracy: ±1% FS
• Linearity/Hysteresis: ±0.1%
• Operating Voltage: 10-36 VDC
• Temperature Range: -40° to +131°F (-40° to +55°C)

Sensing Element

• Diaphragm Material: Silicone (wet-wet configuration)
• Available Ranges: 0-3', 0-15', 0-30', 0-60', 0-120', 0-250', 0-500' (0.9m to 152m)
• Accuracy: ±0.1% FS (constant temperature), ±0.2% (35° to 70°F range)
• Overpressure Protection: 2x rated range

The WL400 offers seamless integration with various monitoring systems through its standard 4-20 mA analog output. Key integration features include:

• Signal transmission up to 3000 feet (914 meters)
• Optional voltage output (0.5-2.5 VDC) via 125 ohm resistor
• Compatibility with most data loggers and telemetry systems
• Simultaneous water level and temperature measurement

What are the primary applications for the WL400?

The sensor is ideal for static water level monitoring in rivers, streams, groundwater, and coastal waters, as well as industrial water level measurement applications.

How does the WL400 differ from other YSI water level sensors?

The WL400 features analog output rather than digital and uses a silicone diaphragm instead of stainless steel or titanium alternatives found in other models.

What calibration is provided?

Each unit is factory-calibrated by YSI and includes certification documentation.

How often should field calibration be performed?

Annual calibration is recommended when operational conditions permit.