Description
The GP1 Data Logger is a compact, research grade data logger
• High accuracy 7 channel data logger
• 600,000 readings
• Compatible with DeltaLINK-Cloud data viewing and sharing service
Overview:
Depending on the combination of sensors and accessories used, the GP1 can take readings from:
• 2 ML3 or SM150T Soil Moisture Sensors (or other voltages)
• 2 Pressure transducer tensiometers
• 2 Temperature sensors (or 2 SM150Ts)
• 2 Pulse counters (for rainfall or water meter)
• 1 Delta-T WET sensor
The GP1 provides 2 differential voltage channels that are ideal for connecting ML3 and SM150T soil moisture sensors.
The two temperature channels are optimised for 10k thermistor probes and provide accurate temperature readings over the range -20 to +60°C. They can be used to log the temperature outputs from ML3 or SM150T sensors. Either channel can alternatively be used to log the soil moisture output from additional SM150T sensors.
Ease of use:
The GP1 is very simple to set up and maintain, particularly for outdoor data logging applications. Its small size and waterproofing (IP67) allow it to be fitted wherever is most convenient, and no secondary enclosures are required. The internal alkaline battery lasts for >1 year (when taking hourly readings from 2 moisture sensors, 2 temperatures and
a rain gauge).
The GP1 can be fully c onfigured, connections checked, data collected and readings displayed in the field using a notebook PC.
Other Features:
Communications: Data can be collected by a laptop via RS232, or via USB (USB to RS232 Adapter Cable type USB-RS232 required), or remotely using the modem options. Up to 10 GP1s can be networked together in order to share power and communications.
Reading frequency: The GP1 can be configured to record readings at any frequency from 1 second to 24 hours. All
sensors are recorded at the same rate.
Power: The GP1 is very power efficient and a single 9 V alkaline battery will typically last for a full year when taking hourly readings. Alternatively it can be powered from an 11 to 24 V DC external power source or from a solar panel.
Configuring the GP1 with DeltaLINK:
The free DeltaLINK software supplied with the GP1 enables full configuration, sensor checking (including real-time
graphing) and data collection from the logger. Collected data can be graphed directly in DeltaLINK or imported into
Excel using the data import wizard.
Memory: The GP1 stores over 600,000 readings in non-volatile flash memory ensuring data security in the event of a flat battery.
Sealing: The small (140 x 105 x 45 mm) enclosure is fully sealed to IP67, doing away with the need for an expensive
additional enclosure for simple field applications. It is also easy to conceal if security is an issue.
Irrigation control:
The GP1 Data Logger can use soil moisture to control irrigation directly (and/or rainfall and/or temperature), or
act as a sophisticated interface between these sensors and many types of programmable timer.
Specialist configuration programs are provided for irrigation control.
| Brief Specification | |
| Voltage range | -0.2 to +2.7 V differential |
| Accuracy | ± (1.6 mV + 0.05% of
reading) |
| Resolution | ± 0.1 mV |
| Temperature | ± 0.07°C, typical at 20°C
(10k thermistor) |
| Pulse counter | 1 x 50Hz, 1 x 33kHz max |
| Relay output | <30 V DC or <24 V AC,
1 A fuse (resettable) |
| Sensor excitation | Switched battery
5 to 9 V, 120 mA max or precision 5 V, 50 mA max |
| Reading storage | 600,000 readings, typical |
| Connections | 4 cable glands
5-way RS232 / external power connector |
| Environmental/operating/temperature | Water resistant to IP67
-20 to +60° |
| Size, weight | 140 x 105 x 45 mm
280 g |
| Battery type, life | 9 V 6LR61 (PP3), alkaline,
~1 year |
