音叉物位开关通过与被测介质接触时音叉频率或振幅的突然改变，智能电路对此进行检测，并转化为一个开关信号的原理达到限位的目的。E+H是音叉的首创者和业界的领导者，至今已有数百万台音叉在世界各地几乎所有行业成功使用。

FTL20/20H-系列                                                 FTL260-系列
传感器长度:35mm                                               温度范围:-40℃...+160℃(-40°F...+70°F) 
温度范围:-40...150℃                                          过程连接:1 NPT to ANSI B 1.20.1 316 SS 
耐        压:-1...40 bar                                                             G1 A to DIN ISO 228/1,316SS
过程连接:1/2,3/4, 1                                                               R1 to DIN 2999 Part 1,316SS   
输        出:AC,DC,ASi                                          电源:AC,19...253V,50/60Hz                        

FTL50\50H-系列                                                  FTL51/51H-系列
传感器长度:65mm                                                传感器长度:148...6000 mm
温度范围:-50...150℃                                           温度范围:-50...150℃
耐        压:-1...63 bar                                             耐        压:-1...63 bar
过程连接:3/4, 1, flanges                                        过程连接:3/4, 1, flanges  
输       出:AC,DC,Relay,8/16mA,NAMUR,           输        出:AC,DC,Relay,8/16 mA,NAMUR,PFM, 
                PFM,PROFIBUS                                                   PROFIBUS

FTL51C-系列                                                        FTM20-系列
传感器长度:148...3000mm                                    传感器长度:225 mm
温度范围:-50...150℃                                            温度范围:-40...150℃
耐        压:-1...40bar                                               耐        压:-1...25 bar
过程连接:Flanges                                                   密        度::from 200g/l,12lbs/ft3 
输        出:AC,DC,Relay,8/16 mA,NAMUR,          输出:DC,AC/DCrelay
                 PFM,PROFIBUS

FTM21-系列                                                           FTM50-系列
传感器长度:500, 1000, 2000 mm                           传感器长度:145,200mm
温度范围:-40...150℃                                             温度范围:-50...150℃
耐        压:-1...25 bar                                               耐        压:-1...25bar
密        度::from 200 g/l,12lbs/ft3                              密        度::from 8 g/l/0.6 lbs/ft3  
输        出:DC,AC/DCrelay                                      输        出:AC,DC,AC/DC  relay,8/16mA,     

FTM51-系列                                                           FTM52-系列
传感器长度:300...6000 mm                                    传感器长度:750...20000mm
温度范围:-50...150 ℃                                            温度范围:-40...80℃
耐        压:-1...25 bar                                               耐        压:-1...6 bar
密        度::from 8 g/l / 0.6 lbs/ft3                              密        度::from 8 g/l/0.6 lbs/ft3 
输        出:AC, DC, AC/DC relay, 8/16 mA,            输        出:AC, DC,AC/DC relay,8/16mA, 
                 NAMUR, PFM                                                        NAMUR,PFM