SFD-300 single channel alarm controller 
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                    SFD-300
                
            
                        
                        
                            Common problem                             
                        
                    
                    
                    
                    
                    
                
                        SFD-300 single channel alarm controller 
                        
                    
                    
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The site has no gas leakage, but the display has a reading and is not zero?
8 2016-08-11 13:36:15
 
Enter the "calibration",then"zero calibration >" click "zero calibration", and later on  "calibration" , enter the password "3003" can be preserved

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