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Aquaflex Soil Moisture Sensor

The Aquaflex soil moisture probe is ideal for applications where monitoring soil moisture at just one point isn't good enough. It samples a full 3 metres length of the soil over a 50mm radius of measurement along the entire sensor. This provides a measurement volume of 6 litres (370 cubic inches) of soil.

How it Works

A process called Time Domain Transmission (TDT) is used by Aquaflex. This involves an electrical pulse being sent along a transmission line embedded within the probe. The evanescent field around the transmission line interacts with the surrounding medium. The information is extracted from the shape of the pulse which gives a good indication of soil conductivity - information that is used to compensate the moisture measurement reading to maintain accuracy in conductive soils.

There are two separate 4-20mA outputs for soil moisture and soil temperature for connection to irrigation controllers, telemetry systems etc.

Power Supply: +6.0 to +26 Volts, DC
Power Supply Current: 10mA average, 150mA peak (for 60 milliseconds during measurement) plus two current loops of up to 20mA each
Time to Measure: 0.8 seconds after power supplied (typical) - 1 second maximum
Time between Measurements: 1 minute if power applied constantly
Operating Temperature: -10 to 40 degC

Soil Moisture Measurement
Range: 0 to 60% volumetric moisture content
Precision / Repeatability: +/- 0.5%
Accuracy: +/- 2%
Soil Temperature Measurement
Range: -10 to 50degC
Accuracy: +/- 0.5%
Cable length: 3m

Other options available:
Connector for use with Handheld Reader.
Frequency Output signal (Soil moisture only).

Ordering Information:
AQF SI.162-03