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2.2 Schematic diagram:
3. Wiring diagram and precautions for safe use
3.1 Installation location and environment
：
● Ambient temperature: -5℃~40℃ and good ventilation
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● Places with no dripping water and low humidity
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● Places without sunlight, high temperature and severe dust
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● Location without corrosive gas and liquid
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● Places with less dust, oil gas and metal dust
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● No vibration, easy maintenance and inspection place
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● Places without electromagnetic noise interference
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