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SEN12512 EasyAG Water-Content Probe with SDI-12 Interface
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Note: The SEN12512 is only available in a limited supply and will be discontinued after the supply is exhausted. 

The SEN12512 is an EasyAG probe with an SDI-12 interface and a 50-cm length. This probe provides water content profiles for cultivated soils of good tilth—commonly found in vegetable production areas. For stony soils where the average stone size is greater than 10 mm, use the EnviroSCAN probe.

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Benefits and Features

  • Multiple sensors at fixed depths
  • Built-in probe orientation and depth settings to increase sensor repeatability
  • Customized access tube increases sensor accuracy
  • Specially sealed to guarantee long-term operation
  • Probe and sensors are readily accessible and serviceable without destroying the site


Detailed Description

The SEN12512 includes several water content sensors that measure soil water at multiple depths. Around each sensor, the probe creates a high frequency electrical field that extends through the access tube into the soil. Electrical capacitance is then measured and soil water content is determined from those measurements.

Each water content sensor outputs an SDI-12 signal that our CR200(X)-series, CR800, CR850, CR1000, and CR3000 dataloggers can measure. This allows the probes to be integrated with a Campbell Scientific data logger or weather station. Integrating the probes into our data acquisition systems allows the data to be telemetered back to a field station or remote computer.


Sensor Measuring Principle High-frequency capacitance
Output SDI-12 version 1.2
Interface Measuring Principle 16 bit pulse count
Output Resolution 16 bit
Current Consumption
  • 250 µA (sleep)
  • 66 mA (standby)
  • 100 mA (sampling)
Water Content Reading Range 0 to ~65%
Temperature Effects ±3% (5° to 35°C)
Time to Read 1 Sensor 1.1 s
Sphere of Influence 99% of the reading is taken within a 10 cm radius from the outside of the access tube.
Sensors per Standard Probe 5
Operating Temperature Range 0° to 75°C
Sensor Diameter 2.65 cm (1.0 in.)
Access Tube Diameter 3.2 cm (1.3 in.)
Probe Length 50 cm (20 in.)


Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.

Data Loggers

Product Compatible Note
21X (retired)
CR10 (retired)
CR1000 (retired)
CR10X (retired)
CR200X (retired)
CR206X (retired)
CR211X (retired)
CR216X (retired)
CR23X (retired)
CR295X (retired)
CR3000 (retired)
CR500 (retired)
CR5000 (retired)
CR510 (retired)
CR800 (retired)
CR850 (retired)
CR9000 (retired)
CR9000X (retired)

Frequently Asked Questions

Number of FAQs related to SEN12512: 2

  1. To protect itself, the interface will switch off when the supply voltage is above or below these operating voltages:

    • Series 1: 9.6 to 20 Vdc (regulated)
    • Series 2: 4.5 to 15 Vdc (regulated)

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