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Weighing Lysimeter with ET Station

Advanced monitoring system for measure hydrological fluxes
A fully integrated weighing lysimeter system for the measurement of hydrological flux between soil, plant, and atmosphere comprising the measurement of plant water use and (optionally) evapotranspiration simultaneously.

About the System

A fully integrated weighing lysimeter system for the measurement of hydrological flux between soil, plant, and atmosphere comprising the measurement of plant water use and (optionally) evapotranspiration simultaneously. The system is designed for use with the ICT International Dataview Platform. The high precision weighing lysimeter system available is with various load cell ranges and optionally an integrated evapotranspiration (ET) weather station. Sensor combinations are built around three tiers of products, providing increasingly responsive and accurate solutions.
Parameter Tier 1 (Good) Indicative / Observation Tier 2 (Better) Decision Tier 3 (Best) Research / Benchmark
Lysimeter Weigh Scale SDI-12 Weigh Scale SDI-12 Weigh Scale SDI-12 Weigh Scale
Drain measure PRS-02 PRS-02 PRS-0 2
2x Soil Water Potential Tensiometer TM7 TM7
2x Soil Moisture Sensors SMT-100D TDR-310/315 TDR-310/315
Optional ET Weather Station (WLWS) Wind Calypso Windsonic Windsonic 75
Rain PRP-02 RIM-7499-STD RIM-7499-BOM
Pyranometer SP-421 SP-421 SP-421
Soil (Single) SMT-100 TDR-310/315 TDR-310/315
Plant Water Use SDI-12 Sap Flow SDI-12 Sap Flow SDI-12 Sap Flow
Crossarm Yes Yes Yes
Power system LP LP LP
Part Number WL-T1 WLWS-T1 WL-T2 WLWS-T2 WL-T3 WLWS-T3

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About the Integrated Weighing Lysimeter

All systems are built upon the ICT International Datalogger, which is optimised for the Dataview data handling platform. Providing an all-in-one datalogger, with power management and data handling, the datalogger platform is expandable with optional communication and sensor expansion modules.

The systems contain all parts required for the installation of the system, enabling the deployment of the system from the box.

About the Data

The Integrated Weighing Lysimeter System measure the following parameters which can be visualised in the Dataview platform:

Part Number WL-T1

WLWS-T1

 WL-T2

WLWS-T2

 WL-T3

WLWS-T3
Lysimeter Weigh Scale
Drain measure
2x Soil Water Potential MPa of soil water potential Soil water tension and soil temperature Soil water tension and soil temperature
2x Soil Moisture Sensors
ET Temp / Humidity / VPD Direct measure:
Temperature
HumidityCalculated:
Wet Bulb Temperature
Dew point
VPD		 Direct measure:
Temperature
HumidityCalculated:
Wet Bulb Temperature
Dew point
VPD		 Direct measure:
Temperature
HumidityCalculated:
Wet Bulb Temperature
Dew point
VPD
Wind
Rain Daily rainfall (user defined time – default to 9am)

Visualisations:
Cumulative rainfall
Daily rainfall
Intensity

 Daily rainfall (user defined time – default to 9am)

Visualisations:
Cumulative rainfall
Daily rainfall
Intensity

 Daily rainfall (user defined time – default to 9am)

Visualisations:
Cumulative rainfall
Daily rainfall
Intensity
Pyranometer Solar Radiation in watts per square metre (W m-2) Solar Radiation in watts per square metre (W m-2) Solar Radiation in watts per square metre (W m-2)
Metadata Geolocation Accurate to 5 decimal places (approximately 1.11 metres, depending on installation conditions) Accurate to 5 decimal places (approximately 1.11 metres, depending on installation conditions) Accurate to 5 decimal places (approximately 1.11 metres, depending on installation conditions)

About the sensors

Tier 1 Sensors (WL-T1 and WLWS-T1):

A low powered solution, these sensors are combined with a standalone data logger/communication system due to the very low power that these sensors consume. This low power consumption, combined with reliable and proven technologies make the ideal solution for widespread data collection networks across a study site.

  • Lysimeter
    • SDI-12 Weigh Scale
    • PRS-02
    • Tensiometer
    • SMT-100D TDR-310/315
    • Tensiometer: Providing measurements of the soil water potential, available in various lengths, the tensiometer measures the __________ that water can move through the soil.
  • ET:
    • Vaisala HMP60: For the measurement of vapour pressure deficit (VPD), a reliable, robust, and proven sensors is essential. The Vaisala HMP range of temperature and humidity sensors utilise a replaceable calibration chip that ensures high quality data is collected for the calculation of VPD – the atmospheric driver within the soil, plant, atmosphere continuum. The temperature/humidity sensor includes a matt radiation shield to reduce reflection, ensuring that there is minimal measurement interference.
    • Wind (Calypso): A compact ultrasonic wind speed and direction sensor, the Calypso wind sensor measures gusts, direction, and speed at a user defined frequency. With no moving parts, the Calypso wind sensor is ideal for installation in long-term
    • Rain (PRP-02): A robust tipping bucket rain gauge with 0.2 mm resolution, the PRP-02 is mounted on the crossarm, alongside the other sensors ensuring the station is easy to install and transport.
    • Pyranometer (SP-421): With traceability to ISO9060, the Apogee SP-421 is a proven, reliable, calibrated pyranometer for the measurement of solar radiation.
  • Power System: Supplied with the Low Power system containing a 10-watt solar panel and matching mount, and an internal 6,000mAh battery. The power system can be expanded with a supplementary 10-watt solar panel and mount to provide additional charge when used in low light conditions (EP-L).

Tier 2 Sensors (WL-T2 and WLWS-T2)

With external solar power, the Tier 2 sensors are ideal for long-term installation

  • Lysimeter
    • SDI-12 Weigh Scale
    • PRS-02
    • TM7 Tensiomark: An SDI-12 sensor that measures the soil water potential, the TM7 is a low maintenance sensor that is ideal for installation as part of a SPAC monitoring system.
    • TDR-310/315:
  • ET:
    • Vaisala HMP110: The HMP110 builds upon the benefits of the HMP60, but is a higher accuracy for both humidity (±1.5 %RH vs ±3 %RH) and temperature (±0.1 °C vs ±0.5 °C)
    • Wind (Windsonic): High performance ultrasonic wind speed and direction sensor,
    • Rain (RIM-7499-STD):
    • Pyranometer (SP-421):
  • Power System: Supplied with the Low Power system containing a 10-watt solar panel and matching mount, and an internal 6,000mAh battery. The power system can be expanded with a supplementary 10-watt solar panel and mount to provide additional charge when used in low light conditions (EP-L).

Tier 3 Sensors (WL-T2 and WLWS-T2)

The Tier 3 sensors provide a high-quality research platform for detailed measurement of the soil-plant-atmosphere continuum. The tier 3 sensor suite provides the benchmark system for researchers to build their experiments around.

  • Lysimeter
    • SDI-12 Weigh Scale
    • PRS-02
    • TM7 Tensiomark: An SDI-12 sensor that measures the soil water potential, the TM7 is a low maintenance sensor that is ideal for installation as part of a SPAC monitoring system.
    • TDR-310/315:
  • ET:
    • Vaisala HMP155: The HMP155 provides a highly accurate, traceable, temperature and humidity probe for leading research applications. Individually adjusted and calibrated using a six-point calibration across humidity ranges from completely dry to near saturated, the HMP155 is the temperature and humidity sensor for high quality measurements.
    • Wind (Windsonic 75):
    • Rain (RIM-7499-BOM):
    • Pyranometer (SP-421):
  • Power System: Supplied with the Low Power system containing a 10-watt solar panel and matching mount, and an internal 6,000mAh battery. The power system can be expanded with a supplementary 10-watt solar panel and mount to provide additional charge when used in low light conditions (EP-L).

Specifications

    Tier 1 (Good)
Indicative / Observation		 Tier 2 (Better)
Decision		 Tier 3 (Best)
Research / Benchmark
Part Number WL-T1/WLWS-T1 WL-T2/WLWS-T2 WL-T3/WLWS-T3
Parameter Sensor Range / Accuracy / Detail Value Sensor Range / Accuracy / Detail Value Sensor Range / Accuracy / Detail Value
SPAC Weigh Scale SDI-12 Weigh Scale Measuring Range SDI-12 Weigh Scale Measuring Range SDI-12 Weigh Scale Measuring Range
Resolution Resolution Resolution
Accuracy Accuracy Accuracy
Drain measure PRS-02 Measuring Range PRS-02 Measuring Range PRS-02 Measuring Range
Resolution Resolution Resolution
Accuracy Accuracy Accuracy
2x Soil Water Potential Tensiometer Measuring Range +100kPa to -100kPa TM7 Measuring Range 1-1,000 mPa (pF 0 to pF 7.0) TM7 Measuring Range 1-1,000 mPa (pF 0 to pF 7.0)
Resolution 0.1 kPa Resolution 0.01 pF Resolution 0.01 pF
Accuracy ±1.0% span Accuracy +/- 30 hPa & 5 % FS = 0.35 pF Accuracy +/- 30 hPa & 5 % FS = 0.35 pF
2x Soil Moisture Sensors SMT-100D Soil Moisture Range 0 to 60% volumetric water content

(up to 100% volumetric water content with limited accuracy)

 TDR-310/315 Soil Moisture Range TDR-310/315 Soil Moisture Range
Resolution 0.1% volumetric water content or better Resolution Resolution
Accuracy Using factory calibration up to ± 3% (VWC) in mineral soils with moderate salinity from 0 to 50% VWC

Using medium specific calibration up to ± 1% (VWC)

 Accuracy Accuracy
Soil Temp Range -40 to +80°C Soil Temp Range Soil Temp Range
Resolution 0.01°C or better Resolution Resolution
Accuracy Typical ± 0.2°C, max. ± 0.4°C over full range Accuracy Accuracy
ET Temp / Humidity Vaisala HMP60 Range (temp) −40 … +60 °C Vaisala HMP110 Range (temp) −40 … +80 °C Vaisala HMP155 Range (temp) −80 … +60 °C
Accuracy (temp) +10 … +30 °C ±0.5 °C Accuracy (temp) +15 … +25 °C ±0.1 °C Accuracy (temp) At −80 … +20 °C ±(0.176 – 0.0028 × temp) °C
at +10 … +30 °C ±0.5 °C 0 … +15 °C and +25 … +40 °C ±0.15 °C At +20 … +60 °C ±(0.07 + 0.0025 × temp) °C
−40 … 10 °C and +30 … +60 °C ±0.6 °C −40 … 0 °C and +40 … +80 °C ±0.4 °C
Range (humidity) 0–100 %RH Range (humidity) 0–100 %RH Range (humidity) 0–100 %RH
Accuracy (humidity) 0 … +40 °C ±3 %RH (0–90 %RH)

±5 %RH (90–100 %RH)

 Accuracy (humidity) 0 … +40 °C ±1.5 %RH (0–90 %RH)

±2.5 %RH (90–100 %RH)

 Accuracy (humidity) At +15 … +25 °C ±1 %RH (0 … 90 %RH)

±1.7 %RH (90 … 100 %RH)
at −40 … 0 °C and +40 … +60 °C ±5 %RH (0–90 %RH)

±7 %RH (90–100 %RH)

 at −40 … 0 °C and +40 … +80 °C ±1.1 %RH (0–90 %RH)

±1.8 %RH (90–100 %RH)

 At −20 … +40 °C ±(1.0 + 0.008 × reading) %RH
At −40 … −20 °C ±(1.2 + 0.012 × reading) %RH
At +40 … +60 °C ±(1.2 + 0.012 × reading) %RH
At −60 … −40 °C ±(1.4 + 0.032 × reading) %RH
Replaceable Calibration Chip Yes Replaceable Calibration Chip Yes Replaceable Calibration Chip Yes
Wind Calypso Speed: Range 0.5-45 m/s Windsonic Speed: Range 0 – 60 m/s Windsonic 75 Speed: Range 0 – 75 m/s
Speed: Accuracy ± 0.3 m/s up to 10m/s and 3% from 10 to 45m/s Speed: Accuracy 2% RMSE @12 m/s Speed: Accuracy 2% RMSE @12 m/s
Speed: Resolution 0.01 m/s Speed: Resolution 0.01 m/s
Direction: Range 0-360º Direction: Range 0 – 360° (no dead band) Direction: Range 0 – 360° (no dead band)
Direction: Accuracy ± 1º Direction: Accuracy 2° RMSE @12 m/s Direction: Accuracy 2° RMSE @12 m/s
Direction: Resolution 1° Direction: Resolution 0.1° (output at 0, 1 or 2

decimal places)
Rain PRP-02 Collector Area 200cm2 RIM-7499-STD Collector Diameter 203 mm ± 0.2mm RIM-7499-BOM Collector Diameter 203 mm ± 0.2mm
Resolution 0.2mm Resolution 0.2mm Resolution 0.2mm
Accuracy ±2%, to a maximum 144 mm/hr Accuracy ±3% to 250mm/hr

±4% from 251mm/hr to 350mm/hr

 Accuracy ±2% to 250mm/hr

±4% from 250mm/hr to 350mm/hr
Materials: Collector Acrylonitrile Styrene Acrylate Materials Collector: Copper Materials Collector: Copper
Bucket: Gold Plated Brass Bucket: Gold Plated Brass
Jacket: Stainless Steel Jacket: Stainless Steel
Base: Cast Marine Grade Aluminium Base: Cast Marine Grade Aluminium
Pyranometer SP-421 Output Range 0 to 2000 W mˉ² SP-421 Output Range 0 to 2000 W mˉ² SP-421 Output Range 0 to 2000 W mˉ²
Calibration Uncertainty at 1000 W mˉ² Less than 3% Calibration Uncertainty at 1000 W mˉ² Less than 3% Calibration Uncertainty at 1000 W mˉ² Less than 3%
Measurement Repeatability Less than 1 % Measurement Repeatability Less than 1 % Measurement Repeatability Less than 1 %
Non-stability (Long-term Drift) Less than 2 % per yea Non-stability (Long-term Drift) Less than 2 % per yea Non-stability (Long-term Drift) Less than 2 % per yea
Spectral Range 360 to 1120 nm (wavelengths where response is 10 % of maximum) Spectral Range 360 to 1120 nm (wavelengths where response is 10 % of maximum) Spectral Range 360 to 1120 nm (wavelengths where response is 10 % of maximum)
Power system LP Solar Panel 10W HP Solar Panel 20W UHP Solar Panel 10W
Battery 6,000mAh LiPO4 Battery 13,000mAh LiPO4 Battery 26,000mAh LiPO4

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