Design of a low cost signal conditioning circuit for self-compensated non contact capacitive type multi threshold liquid level sensor

Babu, Ch. Sai; Manohar, Premila

doi:10.1109/cimca.2014.7057757

Cited by 5 publications

(4 citation statements)

References 11 publications

(9 reference statements)

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“…The fringe capacitance responds for change in dielectric mass of the measurand present in the vicinity of electrodes and hence facilitates non-contact measurement. This concept demands a minimum of three electrodes to measure a liquid level [6]. The configuration of electrodes E1, E2 and E3, similar in geometry with uniform gap, mounted on the outer surface of the tank and their respective fringe capacitances C12 and C23 are as shown in the Fig.…”

Section: Theoretical Concept Of Sensormentioning

confidence: 99%

“…According to the theoretical aspect employed in this work, determining the occurrence of peak of ΔC1 is the criterion for monitoring liquid threshold level which needs a controller. A SCC is designed to convert very low fringe capacitance output ΔC1 offered by sensor into an enhanced ΔV1 for further monitoring using the controller Siemens PLC [6]. Accordingly, PLC is programmed to acquire and compare ΔV1 of two consecutive discrete levels of rising liquid in order to determine the peak value of difference in voltage (ΔV1(max)) that is an indication of the presence of liquid level.…”

Section: Workingmentioning

confidence: 99%

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Studies on Effect of Corrosion for the Selection of Material of Self-Compensated Capacitive Type Liquid Level Sensor

Babu¹,

Manohar

2019

AMM

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This work deals with the design of fringe capacitance based non-contact type liquid level sensor employing self-compensation feature. The existing capacitive type sensors require additional compensation to overcome the problem of various stray capacitances, specifically due to atmospheric corrosion. This paper emphasizes on the selection of suitable material to accomplish the self-compensation feature in corrosive environment. Rate of attack of corrosion is studied on Copper (Cu) and Aluminium (Al) samples under drizzling environment. Visual Analysis of SEM images of samples exposed for different durations reveal that Al protects itself from the corrosion. Further, performance evaluation of two sensor units with Cu and Al electrodes under the same drizzling environment beside the respective samples indicate that sensor with Al electrodes facilitates the feature of self-compensation in corrosive environment. Further, the sensor is interfaced with Siemens PLC-S200 for liquid threshold level monitoring.

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Section: Theoretical Concept Of Sensormentioning

confidence: 99%

Section: Workingmentioning

confidence: 99%

Studies on Effect of Corrosion for the Selection of Material of Self-Compensated Capacitive Type Liquid Level Sensor

Babu¹,

Manohar

2019

AMM

Self Cite

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“…Despite this, contact water level measurement has proven itself to be more resilient under vigorous conditions while being more cost-effective and offering a reasonable precision compared to contactless and optical fiber water level sensors. Consecutively, capacitive type liquid level sensors were presented in various other papers while their wide acceptance in the market has shown to have significant impact in hydroponics, controlling material position and decomposition of multi-phase liquids as presented in [10][11][12][13][14][15]. Fiber Bragg Grating is an extension of optical fiber filter offering a higher precision with continuous level monitoring at the expense of having increased costs and the need for recalibration for different kinds of liquids [16].…”

Section: Introductionmentioning

confidence: 99%

Capacitive electrode sensor implanted on a printed circuit board designed for continuous water level measurement

2019

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Water level sensors are one of the practical ways to get the actual measurement of the depth of a dam or canal. The ease of deployment and easy data acquisition makes them widely used in many fields. Therefore, it will be advantageous to have a miniaturized water level sensor for easier mobility and deployment. A novel method for measuring water level using a Printed Circuit Board has been proposed in this paper. The design stages of circuit sketching, printing of sketch on PCB and etching are discussed for the electrode water level sensor. A signal conditioning circuit is necessary to maintain a steady flow of current from the power source. The fabricated electrode water level sensor was tested based on its capacitive effect while charging up and the amount of current at each electrode finger at the saturation stage. The hardware enablers for this test were the multimeter and LCR meter. Arduino microprocessor was used to test and measure the transient response time for each electrode finger. The transient response sensitivity of the electrode sensor is measured to be 0.0873 millisecond/cm while the resolution of the electrode sensor is 0.1cm over a range of 30cm water level. A multiple correlation of 0.921 was achieved for the water level, measured current and measured capacitance with P-values less than 0.05 indicating strength of the data obtained from the tests conducted. The result showed strong evidence that the electrode water level sensor can be an alternative method of measuring water level.

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“…The submersion detection sensors studied and applied to date mainly utilize the detection of differences in capacitance, electrical resistance, and the refraction or reflection of optical fibers [5,6,7,8,9,10]. However, because submersion sensors detect differences in capacitance on the contact surfaces of the sensors, there may be malfunctions under conditions of high humidity and rainfall.…”

Section: Introductionmentioning

confidence: 99%

A New Submersion Detection Sensor Using Two Resistance Temperature Detectors Operating on the Thermal Equilibrium Principle

Lee

2019

Sensors

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In this study, a new submersion detection sensor with improved reliability and stability is proposed. The new sensor uses two Resistance Temperature Detectors (RTDs) and operates on the thermal equilibrium principle. The submersion detection sensor controls two RTDs that maintain a constant temperature difference between them in the surrounding environment. The first RTD is used as a reference sensor to measure ambient temperature and the second RTD is supplied with higher current than the reference sensor for self-heating. When submerged, because the thermal conductivity and convective heat transfer coefficient of water are higher than that of air, the temperature difference between the two RTDs is lower in water than in air based on the thermal equilibrium principle. Under these conditions, a submersion detector with a signal conditioning circuit detects these temperature differences. The static performance of the proposed sensor was evaluated by checking whether malfunctions occurred at varying ambient temperatures, differing humidities, and when there was rainfall. In addition, the dynamic performance was evaluated using the response time at varying ambient air temperatures before submersion and with changing water temperatures after submersion, as a metric. The proposed submersion detection sensor is expected to find useful application in aircrafts, ships, and various other industrial fields.

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Design of a low cost signal conditioning circuit for self-compensated non contact capacitive type multi threshold liquid level sensor

Cited by 5 publications

References 11 publications

Studies on Effect of Corrosion for the Selection of Material of Self-Compensated Capacitive Type Liquid Level Sensor

Studies on Effect of Corrosion for the Selection of Material of Self-Compensated Capacitive Type Liquid Level Sensor

Capacitive electrode sensor implanted on a printed circuit board designed for continuous water level measurement

A New Submersion Detection Sensor Using Two Resistance Temperature Detectors Operating on the Thermal Equilibrium Principle

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