PR2 Profile Probe Delta T Devices
Soil moisture content profiles down to 1 m
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.
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 ).
Further details of the PR2 SDI-12 can be found here.
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
( ANALOGUE )
0 to 1.0 V differential
PR2/6 : x6 outputs, PR2/4: x4
( SDI-12 )
( ANALOGUE )
PR2/6 : ~120 mA for 1s
PR2/4 : ~80 mA for 1s
Minimum 7.5 V with 100 m cable
( SDI-12 )
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 200 mm
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
HH2 Moisture Meter – Readout Unit
Main components and software
PR-CB2 Carrying bag for PR2
PR2 Profile Probe Installation
SPA1 Access Tube Spacer – 50 mm Long Tube
SM-AUG-100 Spiral Auger, 45 mm diameter, length 1.2 m.
ATL1 Access tube – Long – For Installation in Augered Hole
ATS1 Access tube – Short – For Installation in Augered Hole
Cables and networks
PRC/M12-05 5 m Cable PR2 to DL6
PRC/w-05 5 m Cable PR2 to Bare Wire
PRC/d-HH2 1.5 m cable PR2 to HH2
EXT/8W-05 5 m extension cable
EXT/8W-10 10 m extension cable
EXT/8W-25 25 m extension cable
Spares and consumables
PR2 Profile Probe – Spares Kit