WL400 WATER LEVEL SENSOR
Submersible Pressure Transducer for Level & Pressure
 
water level sensor,submersible pressure transducer FEATURES:
  • High accuracy and reliability
  • Completely submersible pressure transducer and cable
  • Compact, rugged design for easy installation
  • Minimal maintenance and care
  • Water level sensor compatible with most monitoring equipment
  • 4-20mA output
  • Vented cable for automatic barometric compensation
  • Multiple level ranges available from 3' to 500'
  • Wet-wet water level sensor eliminates vent tube concerns
  • Dynamic temperature compensation system
  • Submersible pressure transducer not affected by foam, wind, or rain
  • Monitors levels in groundwater wells, rivers, streams, tanks, lift stations and open channels
  • CE Certified
Water Level Sensor Product Description

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" diameter housing.  The water level sensor has a molded-on waterproof cable and a two-wire 4-20 mA high level output for connection to a monitoring device.  A 25' cable is standard, and optional cable lengths are available up to 500'.

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 is also has automatically barometric compensation due to the attached vent cable and protected by a stainless steel micro-screen cap, which makes 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, and others.

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 level changes 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 metal foil-type water level sensors typically have serious problems at low-level ranges because of sensor crinkling, stretching, and drifting.

Each submersible pressure transducer has a two-wire 4-20 mA output signal that is linear with water depth.  From 10 to 36 VDC is required to operate the water level sensor, so the level sensors can be operated from common 12 VDC battery systems.  The 4-20 mA signal can run up to 3,000' 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.

Water Level Sensor Specifications

Sensing Element
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 35F to 70F 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 +185F
Compensation: Uses dynamic temperature compensation 30-70 F.  Automatic barometric pressure compensation
Weight: 1/2 lb (227 g)

Housing
Material: 304L Stainless Steel, SS microscreen (hundreds of holes to prevent 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 cm long)(small enough for a 1" well)

Cable
Conductors: 4 each 22 AWG
Jacket Material: Marine Grade Polyurethane
Vent Tube Material: HD Polyethylene
Shield: Aluminum Mylar
Outer Diameter: 0.306"
Temperature Range: -22 to +185F
Weight: 0.7 oz/ft
Length:  Standard 25' (up to 500' from the factory)

Water Level Sensor Installation

The submersible pressure sensor may be placed slightly below the lowest expected water level.  Water level sensor level ranges 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 water level change (this is not necessarily the total depth of water).  Selecting the smallest water level range possible will ensure the greatest accuracy.

The 4-20 mA signal can run up to 3,000' from the water level sensor 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.

Water Level Sensor Applications

The WL400 Water Level Sensor can be used to measure water level, well depth, groundwater level, surface water flow, pipe flow, and water pressure, etc...  NOTE: Polyurethane cable is not recomended for use with hydrocarbons or high concentrations of chlorine.  Please look at the our WL450 Water Level Transmitter to meet the requirements of these types of applications.

Water Level Sensor Options

WL400 Water Level Sensor
When ordering, specify water level range that will cover the maximum water level change for your application (this is not necessarily the total depth of water): 0-3', 0-15', 0-30', 0-60', 0-120', 0-250', and 0-500'.  NOTE: There is a $50 extra charge for 0-500' range sensor.  Selecting the smallest water level range possible will ensure the greatest accuracy. Includes 25 feet of cable.
   
WLEXC  Extra Cable
Cable length is measured from top of logger to bottom of sensor.  WL400 includes 25 feet of cable, and extra cable can be added up to 500 feet.
   
Titanium Option
Replace the standard stainless steel water level sensor housing with titanium.
   
PRPP/PRPM Pressure Pipe Option
Water level sensor is housed in a 8" PVC (PRPP) or stainless steel pipe with 3/4" NPT male thread (PRPM) for logging pressure in municipal water systems.  10' cable standard.  Calibrated in psi with ranges of 0 to 30 psi, 60 psi, 100 psi available.
   
WL-SWO Sewer Flow Option
Mouse-shaped cover protects sensor from fouling and velocity effects in sewer, stormwater and irrigation pipe flows.  Mouse is attached to 4" X 24" stainless steel strap for mounting sensor on pipe bottom.
  water level sensor sewer flow protection
WL-T  Temperature Output Option
Range: 0-50 C, Accuracy: 1% of reading, Output: 0-10mA
   
RELATED PRODUCTS
WL430 Sewage Lift Station Wastewater Level Sensor
Includes 40' of cable
   
WL450 High Accuracy Submersible Water Level Transmitters    
EZ100 EZ Sensor Display
LCD readout display for both portable use and permanent installations.
  Water level sensor,submersible pressure transducer display
WL16 Water Level Logger
Submersible pressure transducer and datalogger for recording water level data.
   
WQMS Water Quality Monitoring System
The standard unit includes a datalogger, temperature sensor, pH sensor, conductivity sensor (with a 0-5000S range unless otherwise specified), and DO sensor.
   
SIT60 Satellite Water Level Telemetry
Retrieve water level data from virtually anywhere, without the typical radio or cellular setup issues.
  Satellite water level station

 

 


  Back to GlobalWater Main Page    |    Back to Testech Home Page    |    M2M Remote Monitoring