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Leaf wetness sensors LW2 and LWH
ICT International's LW2 and LWH leaf wetness sensors replicates the effect of moisture on leaf or artificial surfaces and can be used for a variety of situations such as leaf wetness, rain event or other applications where over-spray events need to be monitored or controlled. The sensor offers a linear output graduated between 0-100% with 0% being the "Dry" end of the scale and 100% being saturated or "Wet" end of the scale.
The LWH is similar to the LW2 but additionally recors accumulated hours above the set threshold. The default threshold setting is 50% wetness.
User definable threshold
A standard "percentage" threshold should be used to define whether the leaf is "dry" or "wet" and this threshold number can be adjusted by the user for specific environments. The steep drying characteristics of the artificial leaf mean very little error results from the use of a standard threshold. This sensor may also be used to monitor surface moisture in a variety of non-plant situations such as road surfaces and condensation in buildings.
Microprocessor control
The gold plated, printed circuit board of the sensor incorporates a microcontroller making it a smart sensor. This provides a number of features making the sensor also suitable for a range of control applications when used as a rain event or spray sensor. The control/alarm outputs can monitor and control applications where aerosol droplets need to be detected to stop an over-spray condition such as found in fountains or irrigation systems subjected to high wind.
The sensors LW2 or LWH are not used in economy mode as there is a need to accumulate the hours of leaf wetness. Power consumption is also very low not necessitating economy mode.
| Features | Applications |
| Excellent sensitivity | Fungal warnings |
| Differentiates "wetness" | Disease predictions |
| Repeatable measurement | Surface moisture monitoring |
| Interchangeable sensor | Crop over-spray monitoring |
| No polarisation effect | Irrigation system design and monitoring |
| Two adjustable thresholds | Plant breeding |
| Dual control outputs | Crop studies |
| Solid state relay stop/start control | Fountain design and control |
| Low power consumption | Building research |
Related Documents
Download the Leaf Wetness sensor operation manual (2.5MB PDF)
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