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Drain Gauge G3

Updated:2023-02-23

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  • Brand: METER
  • Model: G3
  • Description: The only accurate way to understand the amount of nutrients or chemicals leaching into the groundwater is to directly measure deep drainage. Large, controlled-tension weighing lysimeters are the most
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Product Details

Drain Gauge G3 Description:

User's Manual

Incredibly easy to use

The Drain Gauge G3 allows you to deploy multiple units to cover a large area at an affordable cost. It’s an incredibly easy-to-use lysimeter that provides dependable monitoring of leaching, drainage, and recharge without the complexity of larger systems. This means you can instrument entire agricultural fields to better quantify variability. The G3 was deliberately engineered to be installed below the plow layer, so growers can perform normal operations directly over the instrument, which eliminates problems like edge effects. Plus, the Drain Gauge G3 can be combined with METER soil moisture sensors and precipitation gauges to estimate the total water balance more accurately than methods which only guess at deep drainage as a residual.

Understand leaching at a deeper level

The Drain Gauge G3 is a passive-capillary lysimeter that determines the volume of water and chemicals draining from the root zone into groundwater. Once installed below the root zone, water samples are easily collected through the surface port for analysis of chemicals, fertilizers, and other contaminants. Not only is the Drain Gauge constructed from inert materials so it won’t react with compounds collected in the sample reservoir, it also features a sealed design, which allows it to work in both saturated and unsaturated conditions.

Dependability without complexity and expense

The Drain Gauge G3 accurately measures deep drainage without the hassle and expense of installing a complicated weighing lysimeter. Get simplified sampling, easy data collection, minimal maintenance, dependable data, and excellent representation of variability—all at price you can afford.

Almost no power or maintenance required

One challenge with lysimeter measurements is that water can flow around receptacles buried in the ground. Unlike traditional pan lysimeters, the G3 corrects for this problem by using an innovative duct and wick design to keep soil tension in the soil column similar to that of the natural soil at the installation site. After installation, the G3 is practically effortless. It requires almost no power and no maintenance other than periodically pulling samples.

Engineered to fit your needs

The Drain Gauge is designed to be flexible to fit your unique application. A stainless steel or PVC divergence control tube holds the soil monolith. Stainless steel is recommended for taking an intact soil monolith, and PVC is recommended for conditions where heavy metals are leaching.

For most applications, we recommend using the add-on Drain Gauge Sensor to measure conductivity, temperature, and depth of the collected sample and to help determine when to empty the sample reservoir. The sensor also provides time-series drainage data, enabling you to correlate drainage with irrigation, fertilization, or other events. For installation sites that are remote or have high drainage rates, use the G3 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 our new ZL6 data logger.

Feature:

Completely sealed system protects from high water tables

6.1 cm drainage capacity allows for large sampling volumes

Monitor solute fluxes with optional EC sensor

Can be used with the optional AutoPump to automatically draw samples on remote or high drainage deployments

Drain Gauge G3 Specification:

Measurement Specifications Drainage Range: 0−61 mm bottom of wick, 61−100 mm top of reservoir chambers
Resolution: 0.2 mm
Accuracy: ±1.4 mm
Water Depth Range: 0 - 10,000 mm
Resolution: 1.0 mm
Accuracy: ±0.25% of full scale at 20 °C
NOTE: Depth measurement accuracy assumes no abrupt temperature variations.
Temperature Range: -40 to +60 °C
Resolution: 0.10 °C
Accuracy: ±1 °C
NOTE: The pressure transducer may be damaged or destroyed if frozen in ice. Remove sensor if the water temperature could drop below 0 °C (32 °F).
Bulk Electrical Conductivity (EC) Range: 0 – 120 dS/m
Resolution: 0 dS/m
Accuracy: ±0.01 dS/m or ±10%, whichever is greater
NOTE: The EC measurement is corrected to a standard temperature of 25 °C.
Communication Specifications Output DDI Serial or SDI-12 communications protocol
Data Logger Compatibility METER ZL6 data loggers and any data acquisition system capable of 4.0- to 15.0-VDC power and serial or SDI-12 communication
Physical Specifications G3 Drain Gauge Dimensions Mass: 20.0 kg (44.0 lb) with stainless steel DCT
14.0 kg (31.0 lb) with PVC DCT
DCT Dimensions Length: 62.5 cm (24.6 in)
Inner Diameter: 25.4 cm (10.0 in)
Outer Diameter: 26.4 cm (10.4 in)
Width: 3.3 cm (1.3 in)
Reservoir Dimensions Length: 81.3 cm (32.0 in)
Outer Diameter: 11.5 cm (4.5 in)
Access Tube Dimensions Length: 180.0 cm (70.9 in)
Outer Diameter: 6.0 cm (2.4 in)
Material: Schedule 40 PVC
Sensor Dimensions Length: 9.0 cm (3.5 in)
Diameter: 3.4 cm (1.3 in)
Sampling Tube Dimensions Length: 3.0 m (118.1 in) standard, custom lengths available
Outer Diameter: 6.0 mm (0.24 in)
Material: Polyethylene
Operating Temperature Range Minimum: 0 °C
Maximum: 60 °C
NOTE: The pressure transducer may be damaged or destroyed if frozen in ice. Remove sensor if water temperature could drop below 0 °C (32 °F).
Cable Length 10.0 m (standard)
20.0 m
40.0 m (maximum)
Cable Diameter 6 mm (0.25 in) with a minimum jacket of 0.80 mm (0.031 in)
Connector Types Stereo plug connector or stripped and tinned wires
Stereo Plug Connector Diameter 6 mm (0.24 in)
Conductor Gauge 20 AWG/21 AWG drain wire
Electrical and Timing Characteristics Supply Voltage (Power to Ground) Minimum: 4.0 V
Typical: NA
Maximum: 15.0 V
Digital Input Voltage (Logic High) Minimum: 2.8 V
Typical: 3.6 V
Maximum: 5.0 V
Digital Input Voltage (Logic Low) Minimum: -0.3 V
Typical: 0.0 V
Maximum: 0.8 V
Digital Output Voltage (Logic High) Minimum: NA
Typical: 3.6 V
Maximum: NA
Power Line Slew Rate Minimum: 1.0 V/ms s
Typical: NA
Maximum: NA
Current Drain (During Measurement) Minimum: 0.5 mA
Typical: 4.0 mA
Maximum: 8.0 mA
Current Drain (While Asleep) Minimum: NA
Typical: 0.4 mA
Typical: 0.4 mA
Power Up Time (DDI Serial) Minimum: 52 ms
Typical: NA
Maximum: 100 ms
Power Up Time (SDI-12) Minimum: NA
Typical: 700 ms
Maximum: 750 ms
Power Up Time (SDI-12, DDI Serial Disabled) Minimum: NA
Typical: 175 ms
Maximum: 200 ms
Measurement Duration Minimum: NA
Typical: 450 ms
Maximum: 600 ms
Other Compliance Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)

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