Scientific Coordinator at the Jena Experiment, Germany
(DFG-funded Research Unit)
- Soil moisture content profiles down to 1m
- Dual purpose – installed and portable
- Uses access tubes for easy probe insertion and removal
- SDI-12 interface option available
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, or 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 soil moisture probe is built around patented sensing technology which provides unprecedented 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.
Both analogue and SDI-12 interfaces are available for the PR2. Click here for information on SDI-12 Profile Probes.
- Highly reliable field-proven instrument
- Soil moisture content – not just trends
- Out of the box solution – supplied with calibrations for common soil types
- Portable meter option for multi-site measurement
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
The HH2 is a versatile readout unit that provides an easy and convenient way to display and store readings from Profile Probes. With the HH2 and PR2 combination, a probe can be moved from access tube to access tube, enabling large amounts of soil moisture data to be collected at multiple sites.
Profile Probes are available with analogue or SDI-12 outputs.
For the analogue version, order PR2/4 or PR2/6.
For the SDI-12 interface version, order PR2/4-SDI-12 or PR2/6-SDI-12.
Please note that analogue and SDI‐12 probes cannot be mixed on the same cable system
Loggers for analogue Profile Probes
Delta-T offers a choice of two data suitable data loggers. Both have dedicated PR2 Profile Probe input channels and connectors:
The DL6 Data Logger can log one PR2/6 or one PR2/4 Profile Probe
The GP2 Data Logger can log up to two PR2/6s or three PR2/4s
Loggers for SDI-12 Profile Probes
The PR2 SDI‐12 is ideally matched to the SDI‐12 enabled GP2 Data Logger. Many SDI-12 Profile Probes can be connected to a single GP2 (actual number depends on cable length, power, and other considerations).
Augering and Extraction Kits – for optimal Access Tube installation
Proﬁle Probes are used within access tubes inserted into augered holes in the soil – correct installation is vital for accurate measurement of soil moisture proﬁles. The goal of installation is to produce optimal contact between the soil and the wall of the access tube. The augered holes should be straight, smooth sided and the correct diameter.
Delta-T augering kits help you achieve the best possible access tube installation in virtually any soil.
Click here for information about our augering equipment
For Analogue PR2 and SDI-12 PR2
|Volumetric water content
|± 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
|50 to 400 mS.m-1
|Salinity errors included in calibration
|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
|IP67 (when installed in access tube)
|-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
|Individual sensors are interchangeable
Recalibration advised every 3 years (depending on use)
|Generalised Mineral and Organic soil calibrations are supplied