- Monitor soil moisture and other key growing conditions
- Use data to optimise irrigation
- Directly control irrigation using onboard relay
With the GP1 Data Logger it is possible to control irrigation, with measurable water savings of up to 60% achievable without reductions in yield or decline in quality.*
Irrigation can be controlled using combined sensor inputs – soil water, temperature, RH, rainfall, volume of water applied – with or without clock inputs.
The GP1 is also a versatile general purpose 7 channel data logger.
The benefits of optimising crop irrigation can include reduced water use, less fertiliser, reduced run-off, lower pumping costs, better crop quality and reduced labour cost – all leading to increased profits.
NB: Our GP2 Advanced Data logger and Controller offers even more advanced irrigation control capabilities.
* DEFRA WaterLINK (HL0168LHN)
|Input connections||2 voltage channels|
|2 temperatures or 2 additional SM150T Sensors |
|2 counters (33 kHz & 50 Hz)|
|1 Delta-T WET Sensor|
|Control outputs||1 relay (1 A)|
|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||140 x 105 x 45 mm|
|Typical applications||Monitoring soil moisture|
|General data logging|
|Sensor compatibility (maximum number of sensors that could be connected |
|ML3||✓ (2) with temp✓ (4) excl. temp |
|SM150T||✓ (2) with temp✓ (4) excl. temp |
|EQ3||✓(2 as mV only)|
|Tensiometers (bridge sensors)||✓(2) each requires GP-PBA-X50|
|Counters or Events||✓(2) 1 fast 1 slow|
 With USB to RS232 Adapter Cable type USB-RS232
 With appropriate expansion cards and power supply arrangements
 Temperature 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.
For full GP1 specification please see the GP1 data sheet or Quick Start Guide