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.
SPECIFICATIONS
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