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Soil Moisture Sensor Probe Selector

All of Vegetronix soil moisture sensors have the following properties: 

  • Low cost
  • Low power
  • Durable
  • High accuracy
  • Small size
  • Insensitive to salt.
  • Regulated input voltage
  • Wide input voltage range

There are several major differences between the two series of soil moisture sensors.  The VG400 series runs at a much lower frequency than the VH400 and so it is extremely lower power, and has higher sensitivity to volume of the medium being measured.  The two probes have different VWC to voltage curves.  The VH400 is more linear especially in the higher VWC ranges, whereas the VG400 response levels off in the higher VWC ranges.  The VH400 costs slightly more than the VG400. 

The VG400 series has a low voltage probe the VG400-LV which can be powered from a source of only 2V, and outputs a voltage from 0V to 1.8V.    

The VG400 has a much wider sensing field than the VH400.  For example,  if the VG400 is submersed in a pitcher of water, it will have a higher reading than if it is submersed in a glass of water, because it has a wide sensing field.   The VH400 has a much narrower sensing range, and only senses in the immediate proximity, and so is insensitive to differences in the volume of the medium being measured.  If the probe is going to be buried then either probe can be used.   If the probe is going to be used to measure pots of differing volumes then the VH400 should be used. 

Use the VG400 soil moisture sensors in applications that require lower power consumption, and where the probe is used in a control function, such as a sprinkler controller. 

Use the VH400 soil moisture sensors in soils where the soil will have higher water saturation.  Use the VH400 where you need an absolute moisture measurement that is independent of volume, as in the case of measuring moisture in potted plants.

 

  VG400 Series VH400 Series
Price $36.95 $36.95
Input Voltage 2V or 3.3V to 20 VDC. 3.3V to 20 VDC.
Power on to Output stable 400 ms 400 ms
Operational Temperature -40ēC to 85ēC -40ēC to 85ēC
Output Voltage Range 0V to 1.8V or 3.0V 0 to 3V
Typical Power  < 800uA  < 7mA
Sensitive to Volume Yes No
Sensitive to salt No No
Frequency of Operation1MHz80MHz
Internal Voltage RegulatorYesYes
Applications Note: For most all applications it is best to use the VH400 Series. 

Extreme low power consumption,
sprinkler controllers, water level sensing, monitoring of ground soil or soil of a consistent volume.
 		Note: For most all applications it is best to use the VH400 Series.

Low power consumption, sprinkler controlers, moisture monitoring of highly saturated soils, monitoring of ground soil and soil in pots of differing volume.
VWC to Voltage Curves Curves Curves
Product Links VG400 Series VH400 Series
Purchase NowVG400 Series VH400 Series

 

VG400 Soil Moisture Sensor

VG400 Low Frequency Soil Moisture Sensor Probes

The VG400 low frequency series soil moisture sensors are extremely low power, very affordable, durable, and provide an excelent feedback to sprinkler control systems.  They come in 1.8V and 3.0V output versions.  They can also be used as water level sensors. 

VH400 Soil Moiture Sensor

VH400 High Frequency Soil Moisture Sensor Probes

The VG400 high frequency series soil moisture sensors are low power, very affordable, durable, and provide an excelent feedback to sprinkler control systems.  They put out a voltage of 0 to 3V related to the water content of the soil.  They can also be used as water level sensors. 
 

Soil Moisture Sensor Instructional & Promotional Videos

How To Wire Up a Soil Moisture Sensor

The Techno Gardener shows you how to wire up a Vegetronix soil moisture sensor to a digital multimeter.

Soil Moisture Sensor as Water Level Sensor

The Techno Gardener demonstrates how a Vegetronix soil moisture sensor can be used as a water level sensor.

Soil Moisture Sensor Detects Clammy Hands

The Techno Gardener shows you how a Vegetronix soil moisture sensor can also be used to detect the moisture in your hands. It blows away gypsum block sensors with it's instantaneous moisture readings.

 

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