The GP1 is a high accuracy 7 channel data logger. It can record data from 2 differential analog sensors, 2 temperature sensors (or 2 further single-ended analog sensors), 2 pulse counters and one Delta-T WET Sensor.
The GP1 offers a solution in a box, including: PC software, to program the logger and view and analyze data; a serial RS-232 cable, to connect to a PC; and a full-color printed guide that outlines how to connect sensors, how to use the software, and how to get up and running quickly.
An IP67, environmentally sealed weatherproof enclosure is included. The GP1 has an internal battery and extremely low power consumption. The 9V alkaline battery (provided) will typically last over one year, with 3 years typical for a lithium battery. This means low maintenance, without the need or expense of a solar panel or rechargeable batteries.
The GP1 can power sensors with configurable warm-up time prior to taking readings. Both switched power and a switched +5V reference is available for sensor powering.
- High accuracy 7 channel data logger
- 600,000 readings
- Free use of DeltaLINK-Cloud data sharing service
- Smart relay control
|Input connections||2 voltage channels
2 temperatures or 2 additional SM150T Sensors 
2 counters (33 kHz & 50 Hz)
1 WET Sensor
|Control outputs||1 relay (1A)|
|Recording rate||1 second to 24 hours|
|Communication options||RS232, USB  or modem|
|Sensor excitation||1 switched logger power
1 5 V precision reference
|Power||1 9 V 6LR61 (PP3) alkaline or external power 11-24 V|
|Battery life (dependent on usage)||~ 1 year|
|Temperature range||-20 to +60° C|
|Size||5.5" x 4.1" x 1.8" (140 x 105 x 45 mm)|
|Typical applications||Monitoring soil moisture
General data logging
 With USB to RS232 Adapter Cable type USB-RS232
|ML3||(2) with temp (4) excl. temp|
|SM150T||(2) with temp (4) excl. temp|
|EQ3||(2 as mV only)|
|Tensiometers||(2) each requires GP-PBA-X50|
|Counters or Events||(2) 1 fast 1 slow|
Maximum number of sensors that could be connected with appropriate expansion cards and power supply arrangements.
Temp channels provide only single-ended inputs so should not be used with long cables or in noisy environments when used with soil moisture sensors. The accuracy ﬁgures quoted for GP1 soil moisture readings do not apply to these resistance channels when conﬁgured as soil moisture inputs.