METER Legacy Passive Capillary Lysimeter

METER Legacy Passive Capillary Lysimeter

Drain Gauge G3 Passive Capillary Lysimeter

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  • Description

    Monitor groundwater leaching, drainage and recharge

    Use the Drain Gauge to determine the volume of water and chemicals draining from the vadose zone into groundwater. Once installed, water samples are easily collected through the surface port for analysis of chemicals, fertilizers, and other contaminants. The Drain Gauge is constructed from inert materials and will not react with compounds collected in the sample reservoir.

    Accurately measure drainage

    One challenge with lysimeter measurements is that water can flow around receptacles buried in the ground. To correct for this, our Drain Gauge uses an ingenious duct and wick design to keep soil tension in the soil column similar to that of the natural soil at the installation site.

    Customize your drain gauge

    Choose from a stainless steel or PVC divergence tube. Stainless steel is recommended for taking an intact soil monolith, but is not recommended for heavy metal testing.

    For most applications, we recommend using the additional Drain Gauge Sensor to measure conductivity, temperature, depth, and to help determine when to empty the sample reservoir. For installation sites that are remote or have high drainage rates, we recommend using the AutoPump to take samples or empty the reservoir automatically. The sensor and AutoPump can be easily integrated with pre-installed units and are ideal for use with a cellular data logger.

    Benefits

    • Completely sealed system protects from high water tables
    • 61 mm drainage capacity allows for large sampling volumes
    • Can be used with the optional EC sensor to monitor solute fluxes
    • Can be used with the optional AutoPump to automatically draw samples on remote or high drainage deployments
  • Specifications

     

    DIMENSIONSTotal Length: 147 cm

    DCT length: 63.5 cm

    DCT (Inside) Diameter: 25.4 cm

    Reservoir Length: 81.3 cm

    Reservoir (outside) Diameter: 11.5 cm

    Access Tube Length: 180 cm standard, customizable

    Access Tube, Outside Diameteter: 6.0 cm (2″ schedule 40 PVC)

    Sample Evacuation Tube: 1.27 cm OD X 0.79 cm ID X 3 m length; custom lenghts available upon request

    Mass: 20 kg with Stainless Steel DCT, 14 kg with PVC DCT

    RANGEDrainage: 0-61 mm bottom of wick and 61-100 mm top of reservoir chamber

    Water Depth: 0 to 3.5 m

    Electrical Conductivity: 0 to 120 dS/m

    Temperature: -11 to 49 °C

    RESOLUTIONDrainage: 0.2 mm

    Water Depth: 0.5 mm

    Electrical Conductivity: 0.001 dS/m

    Temperature: 0.1 °C

    ACCURACYDrainage: +1.4 mm

    Water Depth: +0.1 % of full scale @ 20 °C

    Electrical Conductivity: +0.01 dS/m or + 10 % (whichever is greater)

    Temperature: +1 °C

    SUCTION AT INTAKE110 cm (11 kPa)
    SOLUTION COLLECTION CAPACITY3.1 L (6.1 cm of drainage) to bottom of wick.  Additional 5.1 L (10 cm of drainage) of reserve capacity in wick chamber
    SOLUTION COLLECTION SURFACE AREA507 cm2 (25.4 cm inside diameter)
    WETTED MATERIALDCT (standard): 304 Stainless Steel 11 gauge

    DCT (optional intert material): PVC

    Wick: dry fired fiberglass

    Root Inhibitor: Treflan (BioBarrierTM), removable

    Sample Evacuation Tube: Polyethylene

    Hydraulic Bridge Material: Diatomaceous Earth (DE)

    All Other Parts: PVC

    OPERATING TEMPERATURE0 to 50 °C (Pressure transducer cannot be allowed to freeze while submersed.)
    POWER REQUIREMENTS3.6 – 15 VDC, 0.03 mA quiescent, 0.5 mA during 300 ms measurement
    MEASUREMENT TIME300 ms (milliseconds)
    OUTPUTSerial TTL, 3.6 Volts Levels or SDI-12
    CONNECTOR TYPES3.5 mm (stereo) plug, or stripped & tinned lead wires (3)
    CABLE LENGTH10 m standard; custom lengths available upon request
    DATA LOGGER COMPATIBILITY (NOT EXCLUSIVE)
    METER Em50/50GEM60/60G,

    ProCheck,

    Campbell Scientific

    SOFTWARE COMPATIBILITYECH2O Utility (rev 1.64+), DataTrac3 (rev 3.4+)

     

    COMPARISONS

    TECHNIQUEACCURACYSPATIAL SCALEINSTALLATION/ MAINTENANCECOSTCOMMENTS
    PAN LYSIMETERPoorMedium – LargeLow$Flux divergence under unsaturated conditions
    STATIC TENSION (WICK) LYSIMETER (I.E. DRAIN GAUGE)FairSmall – MediumLow$$Mid range accuracy, mid range cost
    CONTROLLED TENSION LYSIMETERExcellentMediumHigh$$$Minimal flux divergence/convergence issues; new turn-key systems with lower maintenance
    WEIGHING LYSIMETERBestMediumHigh$$$$$Quantify and manipulate hydrology
  • Comparisons
    TECHNIQUEACCURACYSPATIAL SCALEINSTALLATION/ MAINTENANCECOSTCOMMENTS
    PAN LYSIMETERPoorMedium – LargeLow$Flux divergence under unsaturated conditions
    STATIC TENSION (WICK) LYSIMETER (I.E. DRAIN GAUGE)FairSmall – MediumLow$$Mid range accuracy, mid range cost
    CONTROLLED TENSION LYSIMETERExcellentMediumHigh$$$Minimal flux divergence/convergence issues; new turn-key systems with lower maintenance
    WEIGHING LYSIMETERBestMediumHigh$$$$$Quantify and manipulate hydrology
  • Accessories

    Drain Gauge G3 AutoPump

    When measuring deep drainage there are often times when there may be higher volumes of drainage. Because the Drain Gauge G3 captures all drainage in the measurement area, the sample reservoir often becomes full. If water is not removed from the reservoir before it collects 61 mm of drainage, water will come into contact with the wick. If this occurs, sample water can be pulled out of the reservoir due to capillary rise, resulting in an under estimation of deep drainage.

    We designed the AutoPump with these remote and high drainage sites in mind.  It automatically drains the Drain Gauge G3 reservoir into additional bottles on the surface for later collection or into the field at a point away from the measurement area.

    Drain Gauge Sensor

    We recommend using the additional temperature, depth and conductivity DG Sensor to measure cumulative drainage. Without using the sensor, only manual measurements of cumulative drainage can be made with the Drain Gauge. This sensor will allow you to get the data you need, and know when it is time to take a sample from the reservoir. DG Sensors can be added as an accessory to new units or easily installed on G3 Drain Gauges already in the field.

  • Manuals and Software
  • How our drain gauges work

     
  • G3 drain gauge installation

     

Get more out of every field visit

Saturated hydraulic conductivity is a pain to measure in the field. That’s why we automated almost everything in the new SATURO.

Automated everything

After setup, the HYPROP generates a wet range soil moisture release curve in only three to five days. To save you even more time, it can operate while being left unattended.