公开(公告)号：WO2002068915A1

公开(公告)日：2002-09-06

申请号：PCT/US2002/003375

申请日：2002-02-06

Applicant: ROSEMOUNT AEROSPACE INC.

Inventor： HUSS, Charles, G. ,  KOOSMANN, Mark, R. ,  HONGERHOLT, Derrick, D. ,  HAUGEN, Eric, D. ,  SEIDEL, Greg, A. ,  MEYER, Stephen, R. ,  WILLMS, Gary, A.

IPC: G01F23/24

CPC classification number: G01F23/247 ,  G01F23/22

Abstract: A liquid level indicator (14) used for determining liquid levels in a sealed container (10) includes a heat source (24) bonded to the container (10), a first temperature sensor (26) mounted on the container (10) adjacent the heat source (24), and a second temperature sensor (28) mounted on the container (10) spaced from the heat source (24). The temperatures at the first and second temperature sensors are sensed while the heat source (24) is operating, and the differential in the temperatures is measured and used to control power to the heat source (10). Changes in the differential in temperature between the first (26) and second (28) temperature sensors indicates when the heat conductivity between the first (26) and second (28) temperature sensors changes, due to presence or absence of a liquid in the container (10) at the level of the temperature sensors (26, 28).

Abstract translation: 用于确定密封容器（10）中的液面的液面指示器（14）包括结合到容器（10）的热源（24），安装在容器（10）上的第一温度传感器（26） 热源（24）和安装在与热源（24）间隔开的容器（10）上的第二温度传感器（28）。 在热源（24）工作时感测第一温度传感器和第二温度传感器的温度，并且测量温度差并用于控制热源（10）的功率。 第一温度传感器（26）和第二温度传感器（28）之间温度差的变化表明，由于容器中存在或不存在液体，第一温度传感器（26）和第二温度传感器（28）之间的热传导率发生变化 （10）在所述温度传感器（26,28）的水平面上。