Instrument

• Automatic conversion of pressure transducer measurements to cumulative infiltration
• Up to 4 x pressure transducers per AIM

• Stand-alone logging
• MicroSD expandable memory
• Wireless connectivity and data transfer
• Simple conversion and scripting
• Flexible sensor calibration, look-up tables, and user scripts
• 24-Bit resolution
• IP68 rated water proof enclosure
• Free Windows utility configuration software
• Optional wireless logging via MCC1    

• Field: solar power and 12V battery
• Lab: main power supply
• Internal Lithium-Polymer battery
• Internal voltage regulation
• Optical isolation lightening protection

Meter Specifications

Associated Sensors

The AIM can be connected to any infiltrometer or permeameter with the appropriate installation of pressure transducers. Contact for further information and a solution on your specific application.
Tension Infiltrometer	Unsaturated hydraulic properties of soils Measurements not affected by macropores A measurement of infiltration into the true soil matrix 20cm or 8cm models Length of Water reservoir: 81cm Bubbling Pressure Membrane: 30cm H2O
Pressure Transducer	ICTGT3-1D Specifications: Measurement range: ± 7kPa Accuracy: ± 1% Resolution: 0.01kPa

• Unsaturated and saturated hydraulic conductivity
• Hydrological modelling
• Run-off and groundwater recharge estimation
• Irrigation practices
• Waste water and mine site management

How It Works Figure 1 - Example field installation

Figure 1 (Click to view)


AIM1 with breakout board
and ICTGT3-1D differential
pressure transducer

• A tension infiltrometer is installed in the field and made ready for measurements as per the recommended methodology.
• A differential pressure transducer (ICTGT3-1D) is installed near the bottom of the infiltrometer and is inserted in the tubing between the top of the water tower and the bottom of the water tower. The use of a differential transducer in this way helps to eliminate the effects of bubble noise in the measurements. Figure 1 is an example of an automated infiltrometer field setup logging two devices at the same time.
• The pressure transducer is connected to the Automatic Infiltration Meter (AIM). The transducer will output a value relative to pressure difference between the air pressure at the top of the water tower and the water pressure at the bottom of the water tower. The pressure value recorded by the transducer is linearly related to a metric value displayed on the infiltrometer. The AIM converts the pressure value recorded by the ICTGT3-1D to a metric value.
• The researcher assigns a logging interval in the AIM. For sandy soils logging intervals can be measured in seconds. For clay soils logging intervals can be measured in minutes.
• Figure 2 is an example output data for the ICTGT3-1D pressure transducer versus time from a tension infiltrometer.
• Figure 3 is the data from Figure 2 converted to cumulative infiltration and presented as a function of the square root of time. Output files can record millivolt data, cumulative infiltration data, or both.

More Details

• The AIM is a stand-alone instrument and does not need extensive cables and power requirements. All data is stored within the unit on a removable SD card.
• Communication with the AIM is made either with a USB or wireless connection. Wireless is compatible up to 250m distance.
• The AIM has an internal lithium-polymer battery for several days field work. Batteries can be charged overnight with a CH7 power supply.
• In conjunction with an ICT web-based controller, the AIM and/or individual sensors can be controlled remotely. Real-time, live measurements can be made remotely from any location with internet access. Data can be logged directly onto a remote computer or stored in the field on an ICT log server which can then be accessed via the internet.
• The AIM has a Windows configuration software. The software is GUI based and extremely userfriendly. Custom calibration equations or data can be entered and edited via the software. Real-time measurements, diagnostics and sensor configuration can easily be made.
• The AIM has 2 wire, non-polarized bus for power input. There is no chance of incorrect wiring of positive and negative voltage because the AIM is non - polarized.
• The AIM is IP68 rated and has been demonstrated to operate in extreme environmental conditions. Units are being used in diverse environments from hot Australian deserts, tropical Amazon rainforests, temperate German forests, Indian agricultural fields and North American Arctic cold.

Overview

Look up Table

Script

Self Calibration

Communication

• Wireless communication with any ICT International instrument within 250m.
• Portable, easy to use via ICT International software interface.
• Connects directly into any Windows based computer via USB cable.
• Multiple channel ports, such as SDI-12, RS232, RS485, SI8, ICT-BUS & ICT Wireless Protocols, for highly flexible interfacing between ICT International instruments and third party devices.

Individual Calibration of Sensors