Global Water WL400 Vented Water Level Sensor

Global Water's WL400 Water Level Sensor provides highly accurate water level measurements with 4-20mA output for a wide variety of applications.


  • Monitor levels in groundwater wells, rivers, streams, tanks, lift stations and open channels
  • Dynamic temperature compensation system for high accuracy and reliability
  • Vented pressure sensor for automatic barometric pressure compensation
List Price $820.58
Starting At $779.55
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Global Water's WL400 Water Level Sensor provides highly accurate water level measurement for a wide variety of 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.

Each of the water level sensors consist of a solid state submersible pressure transducer encapsulated in a stainless steel 13/16 inch diameter housing. The water level sensor has a molded waterproof cable and a two-wire 4-20mA output for connection to a monitoring device. A 25 ft cable is standard, and optional cable lengths are available up to 500 ft.

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. The 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.

Water level ranges of 0-3, 0-15, 0-30, 0-60, 0-120, and 0-250 feet are available. The 0-3 ft low-level range is ideal for measuring shallow flows or small water level changes like those encountered in sewers, storm drains, weirs, and flumes. The 0-3 ft water monitoring sensor accurately measures small changes in water, even when the water's depth is only a few inches deep.
Questions & Answers
Is this sensor difficult to maintain?
No, but standard care and calibration methods are suggested. The screen on the end of the sensor should be periodically checked for clogging from mud, sludge, and other debris. If it is fouled, wash the screen with clean water and/or scrub it gently with a toothbrush. Do not insert objects through the screen, as this may cause damage to the sensor. Global Water recommends verifying the sensor's calibration with a sounder or other measuring device once every 6 months
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Global Water WL400 Vented Water Level Sensor
WL400 vented water level sensor with 25 ft. cable, 3 ft. range
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Global Water WL400 Water Level Sensor
WL400 vented water level sensor with 25 ft. cable, 15 ft. range
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Global Water WL400 Water Level Sensor
WL400 vented water level sensor with 50 ft. cable, 30 ft. range
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Global Water WL400 Water Level Sensor
WL400 vented water level sensor with 100 ft. cable, 60 ft. range
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Global Water WL400 Water Level Sensor
WL400 vented water level sensor with 150 ft. cable, 120 ft. range
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Global Water WL400 Water Level Sensor
WL400 vented water level sensor with 300 ft. cable, 250 ft. range
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