BURKERT8030型在線式流量傳感器,德國寶得流量傳感器
BURKERT8030型在線式流量傳感器輸出4mA時，在取樣電阻上的電壓不等于0，直接經模擬數(shù)字轉換電路轉換后的數(shù)字量也不為0，單片機無法直接利用，通過公式計算過于復雜。因此般的處理方法是通過硬件電路將4mA在取樣電阻上產生的電壓降消除，再進行A/D轉換。這類硬件電路推RCV420,是種精密的I/V轉換電路,還有應用LM258自搭的I/V轉換電路,這個電路由兩線制電流變送器產生的4～20mA電流與24V以及取樣電阻形成電流回路，從而在取樣電阻上產生個1-5V壓降，并將此電壓值輸入到放大器LM258的3腳。電阻分壓電路用來在集成電路LM258的2腳產生個固定的電壓值，用于抵消在取樣電阻上4mA電流產生的壓降。所以當兩線制電流變送器為zui小值4mA時，LM258的3腳與2腳電壓差基本為0V。LM258與其相連接的電阻構成可調整電壓放大電路，將兩線制電流變送器電流在取樣電阻上的電壓值進行放大并通過LM258的1腳輸出模擬/數(shù)字轉換電路，供單片機CPU讀入，通過數(shù)據處理方法將兩線制電流變送器的4-20mA電流在LCD/LED屏幕上以0-100A值的形式顯示出來。
803434 NORM-DIN  7603   A 48 x 55 x 2,0 AL                                     
900017 NORM-O B80    90,0 X 3,00                                               
900023 NORM-O B75     9,25X 1,78                                               
900026 NORM-DIN   84  M 4  X 30   4.8 A 2 L                                    
900032 NORM-DIN 10X2                                                           
900065 KOMP--65H-00-900065H                                       
900067 NORM-O B80    40,64X 5,33                                               
900103 NORM-DIN    84  M 6,0X105     A2L                                       
900107 NORM-DIN   125  A10,5         A4                                        
900121 NORM-DIN   433    2,7         A2                                        
900140 NORM-DIN ISO 8675 M18,0X  1,5  04-A2                                    
900142 NORM-DIN    84  M 3,0X 35     A4                                        
900154 NORM-O F80    72,69X 2,62                                               
900157 NORM-O A80    50,0 X 2,5               
：\39526590\39529839/39529830轉8005或者8002
//
\39529831\39529839\39529839-8007或者8008
/
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；單榮兵/余娟       
BURKERT8030型在線式流量傳感器,德國寶得流量傳感器                       
900217 NORM-O A80    24,0 X 2,0                                                
900259 NORM-O B75  4,47 X 1,78                                                 
900294 NORM-23,4 X 3,53                                                        
900295 NORM-O B75    23,4 X 3,53                                               
900301 NORM-DIN    84  M 4,0X 10     A4                                        
900307 NORM-6,0X 22,0X 5,0                                                     
900308 NORM-O F75   124,0 X 3,0                                                
900312 NORM-O F70    16   X 2                                                  
900321 NORM-DIN 16    X  2    X-EPDM 80                                        
900323 NORM-DIN M2,5x 14 4,8  A2L                                              
900331 NORM-O   33,05 X 1,78  N-NBR 75                                         
900347 NORM-O  A 70    9 X 2 N-NBR 70B                                         
900382 NORM-3771  3 X 1,5 FFKM 70 SIMRIZ 49                                    
900388 NORM-O B75    20,29X 2,62                                               
900394 NORM-O F75     8,0 X 2,0                                                
900405 NORM-O N-FKM 75 6 X 2                                                   
900406 NORM-DIN 50,52X 1,78                                                    
900408 NORM-O B75    50,52X 1,78                                               
900410 NORM-O   63,22 X 1,78  N-FKM70                                          
900411 NORM-O B75    63,22X 1,78                                               
900412 NORM-O B75    82,22X 2,62                                               
900413 NORM-O   82,22 X 2,62  N-FKM70