PR2 Profile Probe – SDI-12 version

The PR2 SDI-12 is a digital alternative to the analogue PR2 Profile Probe. SDI-12 compatibility allows integration into new and existing SDI-12 systems.

  • Multiple PR2 SDI-12s can connect to a compatible data logger via a single cable
  • Enables the creation of low cost highly flexible sensor networks
  • Compatible with existing PR2 access tubes and augering kits
  • Flexible integration with 3rd party SDI-12 hardware
  • Low power design; ideal for remote sites

The PR2 SDI-12 Profile Probe builds on the reputation and field proven technology of the analogue PR2. By adopting the widely used SDI-12 interface (v1.3) the PR2 SDI-12 can be integrated with an even wider range of data loggers, sensors and equipment.

SDI-12 is an established communication standard adopted by many manufacturers of environmental monitoring and control equipment. It is popular because it allows large numbers of sensors (from many vendors) to be connected to a logger via a simple cable network, thereby reducing the cost and complexity of wiring large sensor installations. The PR2 SDI-12 conforms to the industry standard SDI-12 (v1.3) specification.

Video – Introduction to PR2 Profile Probe


Cables and connectors

The PR2 SDI-12 has a high quality, stainless steel IP67 rated connector (M12 x 5-way) – connecting to the standard Delta-T range of M12 x 5-way cables and accessories.

(NB: The M12 x 8-way range of cables used for analogue PR2 connection is not compatible with the SDI-12 version of the PR2. Analogue and SDI-12 sensors cannot be mixed on the same cable system.)

GP2 SDI-12 Data Logger – an ideal partner

The PR2 SDI-12 is fully compatible with the SDI-12 enabled GP2 Data Logger and Controller – which features simple point & click configuration.

Up to 50 SDI-12 PR2/6 Profile Probes, or up to 62 SDI-12 PR2/4s, can be connected to a single GP2 SDI-12 Data Logger (subject to cable length and power requirements). In addition to SDI-12 input, the GP2 can log 12 analogue channels.

The SDI-12 enabled GP2 Data Logger and DeltaLINK enable quick and easy creation of sensor networks – without need to resort to the often complex programming methods typically employed by other manufacturers.

Due to the flexibility of the SD1-12 interface and the GP2 Logger, multiple power and cabling configurations may be possible when building a sensor network. Please refer to the SDI-12 Profile Probe User Manual for further information. Alternatively please contact to discuss your application in detail.

The SDI-12 Profile Probe’s electronics have been designed to improve power efficiency – reducing the overall power requirement. This is an important advantage for remote site applications.

HH2 Moisture Meter

The HH2 Moisture Meter can display readings from the PR2 SDI-12 Profile Probe*. This is a great advantage for customers who value the freedom to use SDI-12 Profile Probes in both installed and portable applications. Pre-February 2017 HH2s can be upgraded at low cost (via firmware) to enable PR2 SDI-12 readout. For more information on upgrading firmware please contact our Tech Support department.

The SDI-12 PR2 is connected to the HH2 Meter by the SDI-12/5W-HH2 cable.

*Please note that the HH2 only reads SDI-12 digital data from the PR2 SDI-12 Probe – it is not a general purpose SDI-12 meter.

Cabling System

All Profile Probe accessories, such as augering kits and access tubes, are compatible with the SDI-12 version. Cables are an exception: the analogue PR2 and SDI-12 PR2 cables are not compatible.


Soil Moisture Catalogue (see page 12 for SDI-12 PR2)

Soil Moisture Catalogue (see pages 10 & 11 for Analogue PR2)

PR2 SDI-12 User Manual



Go to PR2 Profile – analogue version page