... C;C) The air moisture <=95%(+25°C);D) the place around IIA~IIC type T1~T6 ... MaintenanceA) when installing ,please revolve the clamping ring to the upper and the under parts separated ... , please revolve the clamping ring with wire through clockwise. the alarming device is with in-out grounding screws , ... , meanwhile, pay attention to the fastening screws. D)if the gasket of inletting device broken, please ...