公开(公告)号：WO1996041135A1

公开(公告)日：1996-12-19

申请号：PCT/US1996008135

申请日：1996-05-31

Applicant: ROSEMOUNT INC.

Inventor： ROSEMOUNT INC. ,  KIELB, John, A. ,  NELSON, Richard, L. ,  MANICOR, Scott, D.

IPC: G01F23/284

CPC classification number: G01F23/284

Abstract: A level transmitter (10) for use in a process application measures height of a product (14) in a tank (12). The level transmitter (10) includes a microwave antenna (18) directed into the tank (10). A low power microwave source (70) sends a microwave signal through the microwave antenna (18). A low power microwave receiver (70) receives a reflected microwave signal. Measurement circuitry (42) coupled to the source and receiver initiates transmitting of the microwave signal and determines product height based upon the received, reflected signal. Output circuitry (48, 56) coupled to a two-wire process control loop (20) transmits information related to product height over the loop (20). Power supply circuitry (40) in the level transmitter (10) coupled to the two-wire process control loop (20) receives power from the loop (20) which powers the level transmitter (10) including the microwave source and the microwave receiver (70).

Abstract translation: 用于过程应用的液位变送器（10）测量罐（12）中的产品（14）的高度。 电平变送器（10）包括引导到储罐（10）中的微波天线（18）。 低功率微波源（70）通过微波天线（18）发送微波信号。 低功率微波接收器（70）接收反射的微波信号。 耦合到源和接收器的测量电路（42）启动微波信号的发射并基于所接收的反射信号确定产品高度。 耦合到二线过程控制回路（20）的输出电路（48,56）在循环（20）上传送与产品高度相关的信息。 耦合到二线过程控制回路（20）的电平变送器（10）中的电源电路（40）从环路（20）接收功率，该环路（20）为包括微波源和微波接收器 70）。

公开(公告)号：EP0830574A1

公开(公告)日：1998-03-25

申请号：EP96916838.0

申请日：1996-05-31

Applicant: ROSEMOUNT INC.

Inventor： KIELB, John, A. ,  NELSON, Richard, L. ,  MANICOR, Scott, D.

IPC: G01F23 ,  G01S13

CPC classification number: G01F23/284

Abstract: A level transmitter (10) for use in a process application measures height of a product (14) in a tank (12). The level transmitter (10) includes a microwave antenna (18) directed into the tank (10). A low power microwave source (70) sends a microwave signal through the microwave antenna (18). A low power microwave receiver (70) receives a reflected microwave signal. Measurement circuitry (42) coupled to the source and receiver initiates transmitting of the microwave signal and determines product height based upon the received, reflected signal. Output circuitry (48, 56) coupled to a two-wire process control loop (20) transmits information related to product height over the loop (20). Power supply circuitry (40) in the level transmitter (10) coupled to the two-wire process control loop (20) receives power from the loop (20) which powers the level transmitter (10) including the microwave source and the microwave receiver (70).