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		     	 	SFD-300 single channel alarm controller 
		     		
		   		
			    
			
					 
            Screen display is 0, the host machine is not zero?            
        
        Adjust the menu of 4mA output calibration,, so that the current between out_I+and out_I-. is 4mA
            Boot time display "error detector", and can not enter the display interface?            
        
        Check detector wiring, whether it is connected to the wrong line, or measuring the detector voltage "24V" between and"GND" is 24V.
            The site has no gas leakage, but the display has a reading and is not zero?            
        
        Enter the "calibration",then"zero calibration >" click "zero calibration", and later on  "calibration" , enter the password "3003" can be preserved

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