The GP2 provides a versatile solution for both simple and complex recording and control applications. For many applications the GP2 is quicker and simpler to set up and install than competitive systems, while still providing full access to a rich set of advanced features. The relay outputs can control experiments and applications with exceptional sophistication using the Script Editor. The GP2 has unique reliability - built on Delta-T’s 25 years’ experience in designing and manufacturing data loggers.

Ease of Use

Simple point and click software makes it easy to configure channel set-up and recording intervals. The menus that support the advanced customisation options can be displayed or hidden as required. Sensor connections are laid out logically with clear, easy-tofollow diagrams and notes. The GP2’s weatherproof case, battery power and convenient accessories make it very easy to install in the field – often without the need for a secondary enclosure.

Flexibility and customisation

The GP2’s analog inputs can be fully customised. Each channel can have its own input type and recording parameters. DeltaLINK software gives the user control over reading frequency, thresholds and units, and provides recording options for average, min and max, plus specialised wind options - including wind rose, gusts and wind averaging Users can add their own custom sensor types to the sensor library, exploiting the GP2’s detailed configuration options. The GP2 provides 4 input ranges down to microvolt resolution with adaptive auto-ranging, excellent analog accuracy, and configurable sensor excitation - enabling it to support nearly all analog sensors. Calculations based on the measurements from several input channels can be recorded and displayed as additional virtual channels (calculated measurements).

Control

Control conditions for experiments and applications can range from simple thresholding to sophisticated calculations using the Script Editor (e.g. irrigation control, PID control, seasonality etc.). Control parameters (e.g. target soil moisture level) can be adjusted throughout an experiment without interrupting data logging. See “Advanced features” on page opposite for further details.

Dependable Quality

The GP2 is a research grade data logger, designed and manufactured to be rugged, sealed and completely dependable. Its program editor has built-in error checking, and enables the full logger configuration (including advanced features) to be road-tested before activation. Sensor integrity, set-up and connections can also be checked before or during logging by viewing real-time measurements. Fault tolerance is provided by intelligent statistics (rejecting erroneous sensor measurements), and safety conditions (upper and lower limits on active and rest periods). The relay outputs can be configured as intelligent alarm outputs, and LEDs on the front panel provide a quick visual reassurance that logging is proceeding ok.

Expansion

An expansion lid is available with additional cable entry points and configurations or wider diameter cable entry glands. The number of programmable control relay outputs can be increased from 2 to 6 using the optional Relay Expansion Module. Up to 7 GP2 Data Loggers can be networked to create complex monitoring and control systems.

Storage, communication & power

4 MB of FLASH memory enable storage of 2.5 million readings (typical). Data can be collected by laptop locally via USB/RS232 or remotely using the cellular modem options. The GP2 has 6 alkaline AA internal batteries as standard. An optional mains power adapter is available (type GP2-PSU). Up to 7 GP2s can share power and communications using an M12 cabling network.