| Principle | 
            Transit time difference method with the advanced ABM (anti-bubble measurement) system | 
        
        
            | Pipe diameter (mm) | 
            50, 80, 100 mm | 
        
        
            | Flow velocity range | 
            Minimum 0 to 0.3 m/s or -0.3 to 0 m/s 
            Maximum 0 to 10 m/s or -10 to 0 m/s | 
        
        
            | Flow range | 
            
            
                
                    
                        |   | 
                        Minimum | 
                        Maximum | 
                     
                    
                        | 50 mm | 
                        0 to 2.13 m3/h | 
                        0 to 70.6 m3/h | 
                     
                    
                        | 80 mm | 
                        0 to 4.65 m3/h | 
                        0 to 154.8 m3/h | 
                     
                    
                        | 100 mm | 
                        0 to 7.99 m3/h | 
                        0 to 266.0 m3/h | 
                     
                
             
             | 
        
        
            | Power supply | 
            100–240 V AC (+10% -15%), 50/60 Hz or 20–30 V DC | 
        
        
            | Power consumption | 
            Approx. 20 VA (AC power), Approx. 6W (DC power) | 
        
        
            | Varistor | 
            Attached to the power supply terminal | 
        
        
            | Surge arrester | 
            Attached to the analog output terminal | 
        
        
            | Enclosure | 
            Standard version: IP66 
            Ex-proof version: IP67 |