GLOBAL WATER WL400 Water Level Logger

Features:
High accuracy and reliability
Completely submersible sensor and cable
Compact, rugged design for easy installation
Minimal maintenance and care Sensor compatible with most monitoring equipment
4-20mA output
Vented cable for automatic barometric compensation
Multiple ranges available from 3’ to 250’
Wet-wet sensor eliminates vent tube concerns
Dynamic temperature compensation system
Not affected by foam, wind or rain
Monitors levels in groundwater wells, rivers, streams, tanks, lift stations and open channels

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.

Specifications:
Sensing element:
Sensor Element: Silicone Diaphragm, Wet/Wet Transducer
Range: 0-3', 0-15', 0-30', 0-60', 0-120',0-250'
Linearity and Hysteresis: ±0.1% FS
Accuracy: ±0.1% FS at constant temperature, ±0.2% over 35° to 70°F range
Overpressure: Not to exceed 2 x full scale range
Resolution: Infinitesimal (Analog)
Outputs: 4-20mA, or 0.5 to 2.5 VDC across 125 ohm resistor
Supply Voltage: 10-36VDC
Current Draw: Same as sensor output.
Warm Up Time: 10 ms minimum
Operating Temperature: -40° to +185°F
Weight: 1/2 lb.
Compensated Temperature Range: 30 to 70°F submerged, automatic barometric compensation

Housing:
Material: 304L SS
Size: up to 5 1/2” long x 13/16" diameter
Weight: ~115g (4 oz)

Cable:
Conductors: 4 each 22 AWG
Jacket Material: 87A shore hardness Polyurethane
Optional jacket: Fluorinated Ethylene Propylene (FEP) Teflon
Cable O.D.: 7.8mm (0.307”)
Vent tube: HD Polyethylene
Shield: Aluminum Mylar
Temperature range: -30 to 85°C (-22 to 185°F)
Weight: ~65g/m (0.7 oz/ft)