Low-Cost Comb-Electrode Capacitive Sensing Device for Liquid-Level Measurement

The normal contact type liquid measurement devices have some drawbacks since they have potential damage due to the sensor fouling or corrosion since those are continuously exposed to the liquid. Especially flash flood may cause the damage of liquid level sensor. So that, it is important to design a non-contact device for liquid level measurement in order to avoid this constrain. Distance can be measured without contact such as laser, ultrasonic and radar. In this research, ultrasonic sensor is used to provide non-contact feature of the device since it is low cost and uses ultra-sound waves rather than light. This vital sensing device is able to sense uneven surfaces, liquids, clear objects, and objects in dirty environments. This paper discussed the measurement of liquid level in a tank as well as storing historical data.

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Polymer Optical Fiber Intensity-Based Sensor for Liquid-Level Measurements in Volumetric Flasks for Industrial Application

ISRN Sensor Networks ◽

10.5402/2012/618136 ◽

2012 ◽

Vol 2012 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

D. S. Montero ◽

C. Vázquez

Keyword(s):

Optical Fiber ◽

Optical Sensors ◽

Low Cost ◽

Industrial Process ◽

Experimental Results ◽

Liquid Level ◽

Polymer Optical Fiber ◽

Wireless Mesh ◽

Level Measurement ◽

Liquid Level Measurement

A low-cost intensity-based polymer optical fiber (POF) sensor for liquid detection applied to volumetric flasks is presented. Experimental results demonstrate the viability of the POF-based sensor system in a high-accuracy liquid level measurement scenario. Moreover, a wireless mesh sensor network based on ZigBee specification protocol to address multiplexed POF-based sensor is also developed. Experimental results demonstrate the feasibility to address a high number of optical sensors in an industrial process framework by means of this low-cost wireless solution.

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Liquid Level Measurement System Design Based on Laser Displacement Sensor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.333-335.37 ◽

2013 ◽

Vol 333-335 ◽

pp. 37-40

Author(s):

Wei Na Liu ◽

Wen Bo Xu ◽

Li Feng Yang

Keyword(s):

Virtual Instrument ◽

High Speed ◽

Liquid Level ◽

Displacement Sensor ◽

Survey Method ◽

Laser Displacement Sensor ◽

Level Measurement ◽

Real Time Measurement ◽

Liquid Level Measurement ◽

Measurement Experiment

In order to improve precision, outdated measurement method, complicated structure and weak anti-jam ability in liquid level measurement, a set of liquid level system was designed with the core of high-precision laser displacement sensor. The system adopted non-contact laser trigonometric survey method and powerful virtual instrument techniques. It could conduct online and real-time measurement to infinitesimal displacement on liquid level with high speed and precision. Through measurement experiment, its accuracy and practical applicability is verified.

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