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Vegetronix VG400 Soil Moisture Sensor Probes
Our VG400 series soil
moisture sensor probes enable precise low cost monitoring of soil
water content. Because our probe measures the dielectric constant of
the soil using transmission line techniques, it is
insensitive to water salinity, and will not corrode over time as does
conductivity based probes. Our probes are small, rugged, and
consume under a milliamp of power.
Compared
to other low cost sensor such as gypsum block sensors, our probes offer
a rapid response time. They can be inserted and take an accurate
reading in under 1 second.
We offer two probes in the VG400 series.
The VG400 which has an output range of 0 to 3V and and the VG400-LV
which has an output range of 0 to 1.8V related proportionally to
water content. The VG400-LV is so power efficient that it can
be run continuously for over 300 hours from a single coin battery,
or over 5 years if the soil is sampled once per minute.
When choosing between the -LV and standard
VG400, only use the -LV, if you have to power the probe with less
than 3.3V. Probes come standard with a 2 meter cable. Also see our high frequency VH400 series soil moisture sensors, which are more sensitive in the higher VWC regions, at the cost of using slightly more power. See our Soil Moisture Sensor Selector, to figure out which probe is right for your application.
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VG400 - Soil Moisture Sensor Probe
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Soil Moisture Sensor Probe Applications
- Irrigation and sprinkler systems.
- Moisture monitoring of bulk foods.
- Rain and weather monitoring.
- Environmental monitoring.
- Water conservation applications.
- Fluid level measurements.
Soil Moisture Sensor Probe Features
- Extreme low cost with volume pricing.
- Not conductivity based.
- Insensitive to salinity.
- Probe does not corrode over time.
- Rugged design for long term use.
- Small size.
- Consumes less than 600uA for very low power
operation.
- Precise measurement.
- Measures volumetric water content (VWC) or
gravimetric water content (GWC).
- Patent pending technology.
- Output Voltage is proportional to moisture
level.
- Wide supply voltage range.
- Can be buried and is water proof.
- Probe is long and slender for wider use,
including smaller potted plants.
Other Vegetronix Products of Interest
Soil Moisture Sensor Probe Pricing and Ordering Info
Contact
us for pricing information.
| ORDER INFO |
| Part Number |
Description |
Price |
Purchase |
| VG400 |
Standard Voltage, Soil Moisture Sensor Probe |
$29.95 |
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| VG400-LV |
Low Voltage, Soil Moisture Sensor Probe |
$29.95 |
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Soil Moisture Sensor Relay Boards
The quickest way to evaluate if the VG400 series is
right for you is to also order some of our sensor relay boards. The relay
boards accept input from a single sensor and control a solid
state or mechanical relay. The relay contacts can be configured to
close when wet, or open when wet. The dry/wet threshold is easily set by an an on
board variable resistor, which can be tuned with a small screwdriver. With
our relay boards, within minutes
you'll be using your VG400 soil moisture probe to control, valves, alarms
or home automation systems.
Soil Moisture Sensor Probe Specifications
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VG400 Probe (Standard
Voltage Probe) |
| Power consumption |
< 800uA |
| Supply Voltage |
3.3V to 20 VDC. |
| Dimensions |
See drawing below. |
| Power on to Output stable |
400 ms |
| Output Impedance |
100K ohms |
| Operational Temperature |
-40șC to 85șC |
| Output |
0 to 3V related to moisture
content |
| Shell Color | Black |
| Voltage Output Curves |
Curves
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VG400-LV (Ultra-Low Voltage Probe) |
| Power consumption |
< 600uA |
| Supply Voltage |
2.0V to 20 VDC. |
| Dimensions |
See drawing below. |
| Power on to Output stable |
400 ms |
| Output Impedance |
100K ohms |
| Operational Temperature |
-40șC to 85șC |
| Output |
0 to 1.8V related to moisture
content |
| Shell Color | Blue |
| Voltage Output Curves |
Curves |
Soil Moisture Sensor Probe Wiring Table
| Bare |
Ground |
| Red |
POWER: 3.3V to 20 VDC. |
| Black |
OUT: (0 to 3V proportional to
moisture content.) |
VG400 Soil Moisture Sensor Probe Drawing
VG400 Soil Moisture sensor Drawing
Soil Moisture Sensor Probe Technical Literature
See our Soil
Moisture Sensor Probe Application
Notes for reference designs and information on how to use the soil
moisture probe in larger systems.
How to Get Started with the Soil Moisture Sensor
Probe
The best way to get started is to order a few sample
soil moisture sensor probes and try them out in your application. Contact
us now to purchase samples.
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