Sriratana, Witsarut

Preferred name

Sriratana, Witsarut

Alternative Name

Sriratana, W.

Main Affiliation

School of Engineering

witsarut.sr@kmitl.ac.th

Now showing 1 - 10 of 25

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Real-Time Monitoring of Hydraulic Oil Deterioration Using a Hall Effect Sensor Under Operational Conditions
(2025-01-01)
Sriratana, Witsarut
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Chartpolrak, Pijaya
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Tammarugwattana, Narin
This paper presents a method for measuring hydraulic oil degradation by detecting metal particle flow using a permanent magnet's magnetic field and monitoring voltage changes in a Hall effect sensor (HES). Degraded hydraulic oil containing increased metal contaminants from component wear exhibits reduced viscosity and higher flow rates. We developed a measurement device incorporating a microcontroller to process data and display contamination levels on an organic light-emitting diode (OLED) screen, enabling real-time monitoring without interrupting machine operations. Experiments measured voltage variations at three system locations with metal contamination levels from 2.5 to 5.0 grams per liter (in 0.5 grams per liter increments). Results showed the HES output voltage varied linearly with particle concentration, demonstrating a maximum deviation of 4.73 millivolts (0.47 %) at 2.5 grams per liter, particularly at the reservoir outlet. This approach helps assess hydraulic oil contamination under operational conditions, offering advantages in real-time monitoring capability, cost-effectiveness, and non-invasive implementation.
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Conductivity analysis of lubricant in terms of deterioration by using a hall effect sensor
(2019-11-01)
Sriratana, Witsarut
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Prommapit, Sombat
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Khwankityotha, Yannadech
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Sriratana, Lerdlekha
This paper investigates the efficiency of lubricant analysis by using electrical conductor theory that applied to check the performance of the lubricant, it will be indicate a life cycle of lubricant. The measurement process has led Electrochemical cell, Induction coil and Hall Effect sensor for electrochemical field analysis and compare it with electrical conductivity. In conductivity measurement experiment, we consider dynamic measurement velocity at 80 RPM with a lubricant Semi-Synthetic 10W-40 type by 5 different life cycle samples ratio, Used lubricant: Unused lubricant are 100% (4: 0), 75% (3:1), 50% (2:2), 25% (1:3) and 0% (0:4). The voltage output of Hall Effect sensor of 100% sample measurement at 100 degree Celsius is higher than the voltage output of 75%, 50%, 25% and 0% sample are 7.04%, 12.21%, 21.25% and 28.65%, respectively. The average percentage of Hall Effect sensor errors with the dynamic measurement method of the 5 lubricant samples was 2.87. Even though this measurement method had a high percentage of errors, but it has a cost advantage over the current measuring devices such as the Viscometer which is expensive cost.
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Development of compatible induction coil with pure AC for hall effect sensor: A study on metal materials thickness
(2018-12-10)
Sriratana, Witsarut
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Khwankityotha, Yannadech
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Satthamsakul, Sutham
This study presents an analysis of the parameters to generate the electromagnetic fields of the induction coils for the application of Hall Effect sensor to classify the aluminum thickness and the classification of the metal materials. In this research three types of induction coil are considered: Type A with one layer, Type B with two layers, and Type C with three layers. Four experiments were conducted. The electromagnetic field of Type C is found to be 11.90% greater than Type B, and 29.26% greater than Type A. The core temperature of Type C with 1 A current applied was found to be 3.50% hotter than Type B and 5.14% hotter than Type A. The classification of the aluminum thickness with the frequency range of 100 Hz to 1.4 kHz are suitable for identifying the thickness of 1, 2 and 3 mm. In terms of the classification of metal materials with all the three types of the induction coil, it can be separated clearly from the samples which consist of steel, stainless steel and aluminum. The total error by using Hall Effect sensor is ±0.5702%.
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Measurement of metal particles in oil lubricant using hall effect sensor under temperature conditions
(2017-11-10)
Inthawatkul, Itti
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Sriratana, Witsarut
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Satthamsakul, Sutham
This paper develops a Hall-Effect sensor based system to assess the performance of a lubricant. The measurement methodology is based on the fact that the electromagnetically induced voltage is directly proportional to the amount of contaminants, which in turn affects the state of the lubricant. Two main cases are considered: the metal particles contaminant, and viscosity. The sample lubricant viscosity was experimentally found to be 49.2874 Cst, which is well within the range of internationally accepted values. Furthermore, the lubricant flow rate was also found to be temperature dependent. The output Hall voltage for the contaminated lubricant was 0.8 A for liquid flow rates between 0 to 30 l/h, which significantly deviates from the non-contaminated lubricant. These results suggests that the presented approach is a simple, low cost system capable of accurately assessing the performance of lubricants without consulting the manufacturer's information, even under normal operational loading.
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A Study on Influences of Metal Materials on Electromagnetic Field Generated by Pure DC and Combined DC
(2018-10-15)
Sriratana, Witsarut
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Kaewnamchai, Vanisara
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Sriratana, Erdlekha
This paper presents the classification of metals materials by application of Hall Effect sensor based on the eddy current method with non-destructive testing. The electromagnetic field was generated by winding an SWG 22 wire onto the ferrite core to create a solenoid. Two measurement systems are used. One uses a Pure DC supply as the excitation voltage of the electromagnetic field of the Hall Effect sensor system; while the other uses a combination of AC and DC supply, which is amplified through an integrated Class-A amplifier circuit, as the excitation voltage. Three different metal samples, namely, steel, aluminum and stainless steel were used as specimen. Current test conducted to determine the suitable current level revealed that a 0.8 A current is safe to allow tests to be conducted. Results show that the Combined DC system is capable to classify conductive materials, where the Pure DC system lacks in this functionality. The Output voltage of Hall Effect sensor to test with steel, aluminum and stainless steel is 4.68 V, 1.74 V and 3.63 V, respectively. Furthermore, the use of the Combined DC system enables aluminum thickness to be distinguished. The tolerance of the system measuring the materials when using the Pure DC and Combined DC are pm 0.0697% and pm 0.58530% respectively.
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Empirical study on influences of electromagnetic field on Hall Effect sensor for analysing oil lubricant deterioration
(2020-07-30)
Satthamsakul, S.
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Sriratana, W.
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Sriratana, L.
This study aims to present the procedure developed for detecting deterioration of oil lubricant under variation of electromagnetic field which was generated by a ferrite-core solenoid coil. The overall diameter of coil was 18.5 mm and the inductance was 22.421 mH from direct current stimulation. The results were then compared to those from frequency stimulation. The optimal efficiency of measurement systems was then assessed by real-time analyzing the metal particle contamination of 3 oil lubricants categorized by grade namely ISO 32, ISO 46 and ISO 68 as well as the viscosity under specific conditions which were flow rate and temperature ranging from 25 °C to 100 °C. The analysis was performed to compare the results from experiments of unused and used (approximately 6 months) oil lubricants. From experiments, the viscosity of oil lubricant was reduced when the temperature exceeded 50 °C. However, the stimulation of coil using 0.9 A direct current could clearly distinguish the difference between the unused and used oil lubricants with metal particle contamination comparing to other values of direct currents applied with 0.42 % of error. Also, the 0.5 kHz of frequency would be the most appropriate value for frequency stimulation with 0.38 % of error.
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Analysis of liquids conductivity using hall effect sensor based on electromagnetic field properties
(2017-11-10)
Sokjabok, Siwakon
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Sriratana, Witsarut
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Satthamsakul, Sutham
This paper presents a new methodology of analyzing liquid conductivity via the Hall Effect sensor based on electrochemical properties. Two different magnetic field cores with the same coil length (10 m, AWG 31) were studied, namely ferrite solenoid cores and toroidal iron powder cores (T131-26). The magnetic field generated by both type of cores was then used to generate a Hall voltage with the cores ratios of 1 : 1. The output Hall voltage is, in turn, sent through a microcontroller, together with a 10 bit converter for real time data analysis. The magnetic-field density of the solenoid for analyzing the conductivity of brine is 31 mT for solenoid, and 10.74 mT for toroid cores, respectively. Results from other materials are compared to the reference conductivity values of salt solution, which amounts to 16.211 mS/cm when assessed with the solenoid core, and 16.406 mS/cm when assessed with the toroid core.
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Subsidence monitoring system for industrial machines based on magnetic field method
(2010-12-01)
Sriratana, Witsarut
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Nakmee, Kreangkrai
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Tanachaikhan, Lerdlekha
This study presents the design of subsidence monitoring system for industrial machine alignment based on magnetic field method. The system was developed to demonstrate the level of land subsidence in the area of the industrial machine located. A computer was used to collect the data and to display the angles of subsidence over operation period. The measurement module consists of two thin-and-curve permanent magnets (10 mm x 41.5 mm x 1.5 mm) with the outer radius of 24 mm, the curve angle of 120 degree, and the maximum magnetic density of 0.23 Tesla. The gap between these two magnets was 12 mm to generate the magnetic tension force. The sensing module was Hall Generator placed perpendicularly to the magnetic fluxes which can generate the output voltage as a function of subsidence angle and magnetic density on X axis and Z (vertical) axis with the resolution of 100 mV per degree. There were two ranges of measurement according to the angle resolution: -20 to 20 degree at 1 degree of resolution per step and -6 to 6 degree at 0.05 degree of resolution per step. ©ICROS.
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Experimental study on differentiating between natural honey and honey glucose syrup by using hall effect sensor
(2018-01-01)
Sriratana, Witsarut
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Sokjabok, Siwakon
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Sriratana, Lerdlekha
This study presents the application of Hall Effect sensor for differentiating the combination of liquids based on electrical conductance. Electromagnetic field was generated from wire (AWG 31) bound on high frequency magnetic core namely Toroidal iron power (T131-26) or C-shape Toroidal core. In this study, the electrochemical cell was fixed at 0.09375 cm<sup>-1</sup> there were 10 samples of several liquid types for testing. Hall Effect sensor was designed to place with high frequency magnetic cores bound by 310-turns wire. From experiment using electromagnetic field generated by C-shape Toroidal core, it can be observed that the samples of natural honey from Germany (J) and sugar substitute for diabetics (I) could be distinguished by considering output voltage of Hall Effect sensor (V<inf>H</inf>) and electrical conductance. The output voltage and the electrical conductance from measurement of natural honey (J) were 3.037 V and 0.941 mS.T, respectively while those from measurement of sugar substitute (I) were 3.030 V and 0.938 mS.T, respectively. Moreover, it can be noted that this methodology could be applied for measuring electrical conductance of several liquid types due to the relationships of output voltage of Hall Effect sensor and electrical conductance of liquid. However, only C-shape Toroidal core was used in this study due to the appropriate generation of electromagnetic field for differentiating both sample liquid types with ± 1.83% of error for natural honey and ± 1.51% of error for sugar substitute from 195 times of repetitive measurement.
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Error analysis of temperature measurement system: A case of PT100
(2009-01-01)
Tanachaikhan, Lerdlekha
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Tammarugwattana, Narin
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Sriratana, Witsarut
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Seangratipen, Tawatchai
This paper presents the study of uncertainty in measurement as well as the error compensation of the industrial temperature instrument under various conditions for precise and reliable results of the measurement. In this study, the temperature calibration system of PT100 was used as a case study. Data used in analysis were collected from 200 values of repetitive temperature measurement in the range of 25 °C to 100 °C using Data logger together with a computer to process, analyze, and collect in database system which was developed from Visual Basic. The efficiency and characteristics of the developed system were statistically analyzed from error, mean, standard deviation, and uncertainty of each measured value to improve the reliability of the instrument which is used in industrial processes.

Sriratana, Witsarut

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