WL400 WATER LEVEL SENSOR
Submersible Pressure Transducer for Level &Pressure
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Water Level Sensor Brochure
Water Level Sensor Quick Reference Sheet
Water Level Sensor Manual*
Water Level Monitoring and Why You Need Barometric Compensation
WL16 Water Level Logger
Global Water’s WL400 Water Level Sensor provideshighly accurate water level measurement for a wide variety of applications,including those in severe environments. The submersible pressuretransducers have a dynamic temperature compensation system, enabling highaccuracy measurements over a wide temperature range. The water levelsensor is easily adapted to all dataloggers, telemetry, monitoring equipment,and displays.
Each of the water level sensors consist of asolid state submersible pressure transducer encapsulated in a stainless steel13/16″ diameter housing. The water level sensor has a molded-onwaterproof cable and a two-wire 4-20 mA high level output for connection to amonitoring device. A 25′ cable is standard, and optional cable lengths areavailable up to 500′.
The Water Level Sensor’s submersible pressuretransducer is fully encapsulated with marine-grade epoxy so that moisture cannever leak in or work its way down the vent tube to cause drift or level sensorfailure (as is the case with other pressure sensors). The water levelsensor uses a unique, highly flexible silicon diaphragm to interface betweenwater and the sensing element. This silicon diaphragm protects the waterlevel sensor’s electronics from moisture and provides each sensor withexceptional linearity and very low hysteresis. The design of thesubmersible pressure transducers eliminates the issues associated with metalfoil diaphragms, which tend to crinkle and stretch out over time causing drift,linearity, and hysteresis problems. The water level sensor is also has automaticallybarometric compensation due to the attached vent cable and protected by astainless steel micro-screen cap, which makes fouling with silt, mud, or sludgevirtually impossible. The water level sensor’s design is great for allsaltwater applications including tide level monitoring, floating docks, andothers.
Pressure transducer level ranges of 0-3′,0-15′, 0-30′, 0-60′, 0-120′, 0-250′, and 0-500′ are available. The 0-3’low-level range is ideal for measuring shallow flows or small water levelchanges like those encountered in sewers, storm drains, weirs, and flumes. The 0-3′ water monitoring sensor accurately measures small changes in water,even when the water’s depth is only a few inches deep. Other metalfoil-type water level sensors typically have serious problems at low-levelranges because of sensor crinkling, stretching, and drifting.
Each submersible pressure transducer has atwo-wire 4-20 mA output signal that is linear with water depth. From 10 to36 VDC is required to operate the water level sensor, so the level sensors canbe operated from common 12 VDC battery systems. The 4-20 mA signal can runup to 3,000′ from the submersible pressure transducer to the logging device. Common twisted pair or electrical extension cord wire may be spliced to thevented cable once the cable is out of the water. The 4-20 mA signal may beconverted to 0.5 to 2.5 VDC by dropping the current signal across a 125 ohmresistor.
Sensor Element: Silicone Diaphragm, Wet/Wet Transducer
Pressure Range: 0-3′, 0-15′, 0-30′, 0-60′, 0-120′, 0-250′, 0-500′
Linearity and Hysteresis: ±0.1% FS
Accuracy: ±0.1% of full scale at constant temperature, ±0.2% over 35°Fto 70°F (1.37° to 21.1°C) range
Overpressure: Not to exceed 2 x full scale range
Resolution: Infinitesimal (Analog)
Outputs: 4-20 mA or 0.5 to 2.5 VDC across 125 ohms
Supply Voltage: 8 to 36 VDC
Current Draw: Same as sensor output
Warm Up Time: 3 seconds recommended
Operating Temperature: -40° to +185°F (-40° to +85°C)
Compensation: Uses dynamic temperature compensation 30 to 70°F (-1.1 to21.1°C). Automatic barometric pressure compensation
Weight: 1/2 lb (227 g)
Material: 304L Stainless Steel, SS microscreen (hundreds of holes toprevent fouling), electronics are fully encapsulated in marine grade epoxy,guaranteed not to leak
Size: up to 13/16″ diameter x 5 1/2″ long (2 cm dia. x 14 cmlong)(small enough for a 1″ well)
Conductors: 4 each 22 AWG
Material: Marine grade polyether jacket, polyethylene vent tube, fullfoil shield
Outer Diameter: 0.306 inch (0.78 cm)
Temperature Range: -22° to +185°F (-30° to +85°C)
Weight:0.7 oz/ft (~65g/m)
Length: Standard 25′ (7.62 m) (up to 500′ (152.4 m) from factory)
The submersible pressure sensor may be placedslightly below the lowest expected water level. Water level sensor levelranges of 0-3′, 0-15′, 0-30′, 0-60′, 0-120′, 0-250′ and 0-500′ are available. When ordering, select the level sensor range that will cover the maximum waterlevel change (this is not necessarily the total depth of water). Selectingthe smallest water level range possible will ensure the greatest accuracy.
The 4-20 mA signal can run up to 3,000′ from thewater level sensor to the logging device. Common twisted pair orelectrical extension cord wire may be spliced to the vented cable once the cableis out of the water. The 4-20 mA signal may be converted to 0.5 to 2.5 VDCby dropping the current signal across a 125 ohm resistor.
The WL400 Water Level Sensor can be used tomeasure water level, well depth, groundwater level, surface water flow, pipeflow, and water pressure, etc… NOTE: Polyurethane cable is notrecomended for use with hydrocarbons or high concentrations of chlorine. Please look at the our WL450 Water Level Transmitter to meet the requirements ofthese types of applications.