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    Contamination Measurement Techniques in Hydraulic Fluid Based on Hall Effect Sensor
    (2024-01-01)
    Satthamsakul, Sutham
    ;
    Khummongkol, Rojanee
    This paper proposed two methods to examine metal particles in fluid using Hall Effect Sensor under the condition of nondestructive testing based on two conditions: test of particles in oil samples, and test of particles in industrial machinery simulation. Hall Effect Sensor was a low-cost device had ability to detect magnetic fields in objects, so this work applied Hall Probe to measure the density of metal in liquid. Hereby, hydraulic liquid was selected to examine because it was one of the most use in industrial machines. By using the sensor, two types of experiment were designed: test of oil sample, and test of simulation process, where the results showed that Hall Effect Sensor had ability to measure particles in both two types of experiment. For oil sample test, the sensor was able to detect metallic powder when the number of contaminants were greater than or equal to 10 milligrams (equivalented to NAS 15 standard). On the other hand, to measure particle in simulation process, magnetic field were generated in two ways, i.e. use of electromagnet, and use of permanent magnet. For using electromagnet as magnetic field source, the result showed that temperature had an influence on metal particle evaluation. Therefore, to get the most accurate value, system's temperature had to employed in calculation process. While, the result of using permanent magnet to generate magnetic field showed that the relationship between output voltage and amount of metal particles were probably in linear form. To apply this method in industrial applications could be an inexpensive way to help officer in detecting metal particle in oil which was able to extend service time of hydraulic liquid properly.
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    Test of oil lubricant viscosity by using hall effect sensor
    (2018-08-13)
    Sriratana, Witsarut
    ;
    Nakklinkoon, Sethawut
    ;
    Satthamsakul, Sutham
    This paper presents the test of oil lubricant. The viscosity of lubricant would decrease and the replacement of lubricant is required when the lubricant is used for a period of time. Hence, viscosity is a major factor that can indicate the quality of the lubricant. The fundamental method known as falling ball viscometer that is basically from Archimedes' principle including Newton's laws of motion were applied for the test. The sphere shaped object was replaced by a standard disc with the drill holes. The experiment was conducted by four new lubricant samples: SAE10W-30, SAE15W-40, SAE20W-50 and SAE90. From the reference position, the standard disc was released to the lubricant container and a timer was counted simultaneously by the microcontroller. The timer was stopped when Hall Effect sensor detected the disc at the bottom of the container. Falling time was compared to the viscosity from the standard rotational Viscometer, namely Brookfield Viscometer model DV-II+Pro to assess the relationship equation between falling time and viscosity. From study, the average error of falling time measurement was 0.109 Sec or 2.106% and the average viscosity error from the equation was 6.171 cP or 3.089% at room temperature (27°C). In addition, comparing to the standard Viscometer, the average percentage error was about 2.113%. Even though the accuracy of this method would not be outstanding, it is efficient with cost advantage compared to the expensive standard Viscometer.
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    Vibration analysis based on magnetic field balancing technique
    (2018-08-13)
    Sriratana, Witsarut
    ;
    Saithong, Pasut
    ;
    Sriratana, Lerdlekha
    This paper presents the design of a vibration measurement system according to ISO 10816-1 standard. In this study, a vibration measuring device was applied the magnetic field balancing technique. For study, the vibration generated for experiment was from a vibration of the motor which taking load in various conditions. The operation and performance analysis of the motor in terms of balance and unbalance position of load can be determined by dividing the experiment into four conditions: Balance position, 25% of unbalance position, 50% of unbalance position and 75% of unbalance position. The magnetic field method influenced by the permanent magnets was applied and the Hall Effect sensor was used as a sensor. The results of the experiment were then compared to those from output voltage of the Hall Effect sensor as well as those from the magnetic field density for analysis the vibration and the effectiveness of motor. The results of the experiment can be considered in terms of torque, frequency and the output voltage of Hall Effect sensor. It was found that the output voltage of Hall Effect sensor at balance position, 25% of unbalance position, 50% of unbalance position and 75% of unbalance position were equal to 2.54 V, 2.67 V, 2.77 V and 2.86 V, respectively while the average of process error was 0.34%.