Self-controlled PTC sensor for reliable overfill protection of liquids

IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276) Pub Date : 2002-08-07 DOI:10.1109/IMTC.2002.1006877

M. Horn, L. Umar, H. Ruser

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引用次数: 8

Abstract

The paper deals with the design of sensors with automatic self-control. A PTC thermistor was selected, which is used as a level sensor to prevent overfill of liquids in tanks. In self-heated mode, the I-U characteristic is basically dependent on the unloading resistance value R/sub T/ of the PTC sensor itself, the thermal resistance R/sub W/ and the temperature T/sub M/ of the medium that is surrounding it. This I-U characteristic of the sensor in thermally steady state in still air is modelled. Problems in detecting the liquid level occur for a soiled sensor surface or liquids with high temperature and/or high viscosity (e.g. crude oil). A solution to this worst-case scenario is to determine R/sub W/ continuously from the I-U characteristic of the PTC thermistor in function. The constant monitoring of the sensor parameters enables an automatic sensor self control, e.g. to identify slow changes of the sensor parameters due to corrosion and dust layers on the sensor surface or ageing.

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自我控制的PTC传感器，可靠的过充液保护

本文研究了具有自动控制功能的传感器的设计。选用PTC热敏电阻作为液位传感器，防止罐内液体过充。在自热模式下，I-U特性基本上取决于PTC传感器本身的卸载电阻值R/sub T/、热阻R/sub W/和周围介质的温度T/sub M/。模拟了传感器在静止空气中热稳态的I-U特性。当传感器表面被污染或液体具有高温和/或高粘度(如原油)时，检测液位会出现问题。这种最坏情况的解决方案是从PTC热敏电阻的I-U特性连续确定R/sub W/。对传感器参数的持续监测使传感器能够自动自我控制，例如识别由于传感器表面的腐蚀和灰尘层或老化而导致的传感器参数的缓慢变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IMTC/2002. Proceedings of the 19th IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.00CH37276)

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