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Greenhouse production is susceptible to a variety of fungal diseases such as botrytis and downy mildew. These pathogens are present in the air, but they can only develop in the presence of freestanding water: dew or other condensation on the plant leaves. Growers know that if they can prevent condensation, they can prevent fungal disease.
The DewSense Dew Detector is an "artificial leaf" that detects when dew forms on the leaves of greenhouse flowers and plants. It can then activate ventilation and heating equipment to remove the condensation. The DewSense is the only accurate system which detects actual condensation. It replaces timer systems, overheating practices, and inaccurate relative humidity monitors. The DewSense saves fuel costs and fungicide treatments - and reduces disease.
Other systems monitor relative humidity, but this only gives a rough indication of when condensation may occur. As greenhouse and outside temperatures change, dew can and does form at lower relative humidity levels (below 85%). Timer systems waste energy and can't prevent condensation when temperatures change outside of the timer period. Fungicide treatments are expensive, and they must be limited to avoid chemical residues and developed resistance. Over-heating harms the produce and wastes costly energy. Only the DewSense Dew Detector activates when, and only when, actual condensation begins to form on the leaf.
The DewSense Dew Detector operates with optical fibers, which cool along with the leaves in the greenhouse. When there is condensation on the leaves, there is condensation on the optical fiber. The DewSense reads the change in the optical signal and sends the activation command to the ventilation system. When it dries, it turns off the ventilation.
Only the DewSense activates when, and only when, actual condensation begins to form on the leaf.
Reduces losses to disease.
Saves energy costs.
Timer systems waste energy and can't prevent condensation when temperatures change. The DewSense saves energy and prevents condensation.
The DewSense reduces or eliminates the need for fungicide treatment. Fungicide treatments are expensive, they must be limited to avoid chemical residues on the plant, and they must be changed regularly to avoid developing resistance.
No need for over-heating. Over-heating practices harm the produce and waste costly energy.
Range: Operates at -20oC to +60oC ambient temperature
Power: 12V DC
Control Output:
000000 4-20 mA DC connection operates at three discreet positions:
000000 8 mA - sensor is powered and dry
00000012 mA - sensor is wet
00000016 mA - malfunction
000000Signal can be converted for devices accepting 0-5V, 0-10V or yes/no dry contact.
Connections and Accessories: Control Unit Switchboard for multiple units, Dry Contact Unit, Power Relay Switch, 12 V DC Power Adapter, Backup Battery Power Unit.
Dimensions: 14.5cm x 9cm x 3 cm
Operation: Optiguide recommends operating the control computer according to the DewSense commands during the evening and nighttime. During this time, DewSense commands should be used to open vents when condensation is detected, and to close vents when condensation dries.
During the evening and night, temperature control should operate according to the thermostat, independent of the DewSense, and should be set to maintain an optimal growing temperature.
The circulation fans should operate all night long, independent of the DewSense.
During normal daytime operation the DewSense will not interfere with control parameters.