Scientific Coordinator at the Jena Experiment, Germany
(DFG-funded Research Unit)
- Portable, accurate soil moisture profiles to 1m depth
- Portable meter option for multi-site measurement
- Uses access tubes for easy probe insertion and removal
No other soil moisture probe system enables you to monitor your soil water profiles with such ease and flexibility. Install an access tube into the soil, insert the PR2 Profile Probe and press the HH2 [Read] button to display an instantaneous reading. Alternatively, connect the PR2 to a data logger (GP2 or DL6) and leave the system to record soil moisture changes over time.
Video – Introduction to PR2 Profile Probe
The PR2 Profile Probe is built around patented sensing technology which provides excellent performance in all soil types, with minimal influence from either salinity or temperature. The PR2/4 model measures soil moisture at 4 depths down to 40 cm – the PR2/6 measures at 6 depths down to 100 cm.
The PR2 Profile Probe access tube requires an installation hole 27 mm in diameter, allowing easy installation and minimal soil disturbance. Access tubes are manufactured to strict tolerances and are exceptionally strong and durable in the soil. Correct installation is essential and we recommend the use of our specially designed augering equipment.
The PR2 Profile Probe is available in two sizes to measure to a depth of 40 cm or 100 cm.
The PR2/4 has sensing elements at 10/20/30/40 cm
The PR2/6 has sensing elements at 10/20/30/40/60 and 100 cm
Complete Auger Kit
Access tube installation is vital.
Click here for information about our augering equipment
The PR2 Profile Probe is also well suited to research applications in horticulture, hydrology, crop science, and water use efficiency. For further details click here.
For Analogue PR2 and SDI-12 PR2
|Measurement||Volumetric water content|
|Accuracy||± 0.04 m3.m-3 (4%) |
With soil-specific calibration
|Soil moisture measurement range||Full accuracy over:|
0 to 0.4 m3.m-3
|Full range : 0 to 1.0 m3.m-3|
|Salinity range||50 to 400 mS.m-1|
|Salinity errors included in calibration|
|Temperature range||Full accuracy over: 0 to 40°C|
0 to 1.0 V differential
PR2/6: x6 outputs, PR2/4: x4
PR2/6: ~120 mA for 1s
PR2/4: ~80 mA for 1s
Minimum 7.5 V with 100 m cable
Power consumption <60 mA at 12 V DC
Sleep current <2 mA at 12 V DC
|Environmental||IP67 (when installed in access tube)|
|Sample volume||-95% sensitivity within a cylinder of diameter 200mm|
|Sample volume is weighted towards soil immediately surrounding the rods|
|Dimensions and weight||PR2/6: length 1350 mm |
PR2/4: length 750 mm
Both: 25.4 mm diameter
PR2/6: weight 1.2 kg
PR2/4: weight 0.8 kg
|Sensor calibrations||Individual sensors are interchangeable|
Recalibration advised every 3 years (depending on use)
|Soil calibrations||Generalised Mineral and Organic soil calibrations are supplied|