公开(公告)号：EP0649529A4

公开(公告)日：1995-08-30

申请号：EP93916944

申请日：1993-07-02

申请人： KAY RAY SENSALL INC

发明人： JONES LAWRENCE J ,  SORENSON MARTIN N ,  ESIN ALEX ,  ROSSELSON BORIS

IPC分类号： G01F23/296 ,  G01F25/00 ,  G01N29/024 ,  G01N29/22 ,  G01N29/02 ,  G01F23/00

CPC分类号： G01N29/22 ,  G01F23/296 ,  G01F23/2965 ,  G01F25/0061 ,  G01F25/0076 ,  G01N29/024 ,  G01N2291/02818 ,  G01N2291/02836 ,  G01N2291/044

摘要： A controller (16) adapted for coupling a plurality of ultrasonic transducers (12, 14) includes a multiplexer (62) for selecting a transducer (12, 14), signal processing means (50) for processing an output of the selected transducer (12, 14), and controller means (64) for providing operational parameters corresponding to the selected transducer (12, 14). The controller (16) couples to a two wire 4-20 mA communication loop (18) to periodically excite the selected transducer (12, 14). The controller (16) stores power received from the communication loop (18) and excites the transducer (12, 14) by using the stored power to exceed the power available directly from the communication loop (18). The controller (16) provides a wet self-test of the transducer (12, 14) whereby the output level of the transducer (12, 14) is monitored while the strength of the excitation signal provided to the transducer (12, 14) is decreased. The amount of decrease required for the output signal to pass a threshold level is an indication of the usefulness of the sensor (18A, 18B-18N).

公开(公告)号：EP1017970A4

公开(公告)日：2000-07-12

申请号：EP98941057

申请日：1998-08-26

申请人： KAY RAY SENSALL INC

发明人： BRENNER RAUL ,  ESIN ALEX J ,  JONES LAWRENCE J ,  ROSSELSON BORIS

IPC分类号： G01F23/26 ,  G01F23/00

CPC分类号： G01F23/268 ,  G01F23/265 ,  G01F23/266 ,  Y10T307/779 ,  Y10T307/826

摘要： A capacitive level sensor (10) for sensing level of a liquid (102) in a vessel (100) includes a sensor (14) coupled to the vessel (100) having a shield (32) and an inner sensing rod (34). An oscillator (44) provides an RF signal to the shield (32) and the sensing rod (34). Comparison circuitry (48) coupled to the sensing rod (34) provides a wet/dry output in response to capacitance between the inner sensing rod (14) and the vessel (100), the capacitance is related to the level of the liquid (102) in the vessel (100).

摘要翻译： 一种用于感测容器（100）中的液体（102）的液位的电容式液位传感器（10）包括耦合到具有护罩（32）和内部感测杆（34）的容器（100）的传感器（14）。 振荡器（44）向屏蔽（32）和感测棒（34）提供RF信号。 耦合到感测棒（34）的比较电路（48）响应于内部感测棒（14）和容器（100）之间的电容提供湿/干输出，电容与液体（102 ）在容器（100）中。