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Grain and cotton warehouse exaggerated humidity automatic ve

2014-11-20 21:10  
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Grain and cotton warehouse exaggerated humidity automatic ventilating and language admonishment circuit
The circuit is as shown, it is composed of humidity sensitivity electric bridge network, comparison circuit, relay control ventilating circuit, language phonation circuit and AC depressurization rectifier circuit . When the warehouse hunidity is exaggerated, the circuit will automatically connect to ventilating fan, and send out admonishment language, to remind the personnel on duty of taking a note. RH is humidity sensor,a bridge testing humidity network is composed of RH, RP1, R1, R2. When the environmental humidity is within the normal range, sensor RH has a large resistance.