WL400 Water Level Sensor

Global Water’s WL400 Water Level Sensor provides highly accurate water level measurement for various applications, including those in severe environments. The submersible pressure transducers have a dynamic temperature compensation system, enabling high accuracy measurements over a wide temperature range. The water level sensor is easily adapted to all dataloggers, telemetry, monitoring equipment, and displays.

Multiple depth ranges are available from 3 to 500 feet of water level change.

Key Features:

• Sensor compatible with most monitoring equipment
• Highly accurate water level measurements
• Not affected by foam, wind, or rain
• Wet-wet transducer eliminates vent tube concerns
• Automatic barometric pressure and temperature compensation
• Well-built to support depths of 3ft to 500 ft
• Can measure level and temperature

The Water Level Sensor’s submersible pressure transducer is fully encapsulated with marine-grade epoxy so that moisture can never leak in or work its way down the vent tube to cause drift or level sensor failure (as is the case with other pressure sensors). The water level sensor uses a unique, highly flexible silicon diaphragm to interface between water and the sensing element. This silicon diaphragm protects the water level sensor’s electronics from moisture and provides each sensor with exceptional linearity and very low hysteresis. The design of the submersible pressure transducers eliminates the issues associated with metal foil diaphragms, which tend to crinkle and stretch out over time, causing drift, linearity, and hysteresis problems. The water level sensor also has automatically barometric compensation due to the attached vent cable. It is protected by a stainless steel micro-screen cap, making fouling with silt, mud, or sludge virtually impossible. The water level sensor’s design is great for all saltwater applications, including tide level monitoring, floating docks, etc.

Each submersible pressure transducer has a two-wire 4-20 mA output signal linear with water depth. From 10 to 36 VDC is required to operate the water level sensor so that the level sensors can be operated from common 12 VDC battery systems. The 4-20 mA signal can run up to 3,000 ft from the submersible pressure transducer to the logging device. Common twisted pair or electrical extension cord wire may be spliced to the vented cable once the cable is out of the water. The 4-20 mA signal may be converted to 0.5 to 2.5 VDC by dropping the current signal across a 125-ohm resistor.