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公开(公告)号：US20250060767A1
公开(公告)日：2025-02-20
申请号：US18722051
申请日：2022-12-02
Applicant: Endress+Hauser Flowtec AG
Inventor： Pascal Buchschacher , Alex Huber , Hanspeter Schmid , Werner Tanner
Abstract: The signal transmission system comprises a transmitter circuit, a receiver circuit and a signal cable. A current divider is formed by a terminating resistor between the signal conductors of the signal cable. The transmitter circuit drives a loop current. When the receiver circuit input voltage has a voltage level above a first switching voltage threshold value, the output voltage assumes a first voltage level. The output voltage maintains the first voltage level when the input voltage is below the first switching voltage threshold value but above a second switching voltage threshold value. The transmitter circuit is configured to modulate the loop current with at least two different non-zero magnitudes at successive times. The first magnitude is greater than a first switching current threshold value and the second magnitude is less than the first switching current threshold value and greater than a second switching current threshold value.
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公开(公告)号：US10175089B2
公开(公告)日：2019-01-08
申请号：US15022242
申请日：2014-08-12
Applicant: Endress + Hauser Flowtec AG
Inventor： Hanspeter Schmid , Werner Tanner , Dirk Sutterlin , Martin Koch
Abstract: A method for monitoring a measuring device of automation technology, wherein the measuring device has a capacitive sensor the sensor has at least one capacitor, and the at least one capacitor is applied for determining or monitoring a process variable. A loss resistance of the at least one capacitor is measured by determining the charge state of the at least one capacitor at a first point in time and at a subsequent, second point in time, and, based on a change of the charge state between the first point in time and the second point in time, information is won concerning disturbance of the ability of the measuring device to function.
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公开(公告)号：US20160231162A1
公开(公告)日：2016-08-11
申请号：US15022242
申请日：2014-08-12
Applicant: ENDRESS+HAUSER FLOWTEC AG
Inventor： Hanspeter Schmid , Werner Tanner , Dirk Sutterlin , Martin Koch
CPC classification number: G01F25/0007 , G01F1/3218 , G01F1/329 , G01R31/028 , G01R31/2829
Abstract: A method for monitoring a measuring device of automation technology, wherein the measuring device has a capacitive sensor the sensor has at least one capacitor, and the at least one capacitor is applied for determining or monitoring a process variable. A loss resistance of the at least one capacitor is measured by determining the charge state of the at least one capacitor at a first point in time and at a subsequent, second point in time, based on a change of the charge state between the first point in time and the second point in time, information is won concerning disturbance of the ability of the measuring device to function.
Abstract translation: 一种用于监测自动化技术的测量装置的方法，其中所述测量装置具有所述传感器具有至少一个电容器的电容传感器，并且所述至少一个电容器用于确定或监视过程变量。 至少一个电容器的损耗电阻是通过基于第一点之间的充电状态的变化来确定在第一时间点和随后的第二时间点的至少一个电容器的充电状态来测量的 在第二时间点上，关于测量装置功能的干扰的信息是获得的。
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