Performance Enhancement of Capacitance-Type Level Measurement System using CCII-Based Interface

摘要

In this paper, a simple design of a short-range non-inductive capacitance-type level sensor which is developed for closed tanks (like fuel tanks of vehicles) is proposed. The level sensor is analytically and experimentally verified for measuring the level of non-conducting liquids. Second-generation current conveyor (CCII) based interface circuit is used to measure the capacitance of the level sensor which gives output in the form of frequency. The developed capacitance-based level measurement system is simple in design, low-cost and it is found that the error in the measurement of a level is very small in the range of 0.04% for a non-conducting liquid level from 10 to 145 mm of the sensor length.