Tammarugwattana, Narin

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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.
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An experimental study of natural lighting for energy conservation using top-up control method
(2008-12-01)
Wangkadilok, Chaichana
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Sriratana, Witsarut
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Tammarugwattana, Narin
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Tanachaikhan, Lerdlekha
This paper presents the experiment-based analysis of interior illuminance from natural lighting through clear glazed window of a reference room located in Bangkok, Thailand, during February to May 2007 as a case study. The point illuminances measured by photoconductive sensors were collected every 5 minutes and the average interior illuminance from natural lighting were then calculated instantaneously. In this study, natural lighting also aims to reduce the requirement of electric lighting during daytime (7 am-5 pm) of the reference room. If natural lighting alone cannot supply the light at the required value, the electric lighting is assumed to be switched on under top-up control method to maintain the standard illuminance level. The average interior illuminance, which comprises of natural light and electric light, is controlled to be stable at the IES standard level of 500 lux. Nine sets of high performance lamp, 56 lm/W of efficacy, are assumed to supply the light to meet the standard condition. The requirements of supplementary lighting and possible savings during the test months are finally estimated. © 2008 SICE.
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Declined angle analysis of shaft using magnetic field measurement
(2009-12-01)
Tanachaikhan, Lerdlekha
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Tammarugwattana, Narin
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Sriratana, Witsarut
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Klongratog, Panupon
This paper presents the method to develop sensor for measuring shaft rotation and angular decline based on trigonometric and Pythagoras method. Magnetic flux density on the direction of constant magnetic field was measured using Helmholtz Coil as a magnetic field generator and using Hall Generator No. A1302 as a sensor. The resolution of shaft rotation was 1 degree per step and the range of shaft decline was varied from 4 to 10 degree away from the origin which was normal to ground level. Angle declining from the origin which is normal to magnetic field can be determined by measuring the relationships between Hall voltage and magnetic filed. If the shaft which was fixed on Hall Generator was rotated and not perpendicular to magnetic field, the Hall voltage was varied and the results was then transferred to computer to evaluate the angular decline of shaft. It can be indicated that the voltage varies sinusoidally while increasing the decline angle. Despite low costs of system, the method presented in this study was developed with consideration of effectiveness and reliability. Moreover, the method can be applied in machine alignment as well as in detection of building structure declination. © 2009 SICE.
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Application of parallel ladder technique for purging oil residual inside the copper pipe
(2011-09-29)
Sriratana, Witsarut
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Tammarugwattana, Narin
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Ganmanee, Suthum
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Tanachaikhan, Lerdlekha
In iron pipe industry, one of the most important problems in manufacturing processes is the great amount of oil residual in copper pipe. This problem can be affected the use of copper pipe further such as difficulty in pipe soldering, pipe rust and leakage. This study aims to demonstrate the use of parallel ladder technique, the simple process with low additional costs, to purge out liquid residual in the pipe after ironing. This technique can improve the efficiency of the manufacturing process as well as increase the quality of the product. Nitrogen was applied in this process with the step-increasing pressure of 0, 5, 10, and 15 Bar. This supplied pressure levels are a function of time which depend on the length of pipe. Nitrogen with specified pressure levels were controlled by 3 sets of control valves which were parallelly arranged. For efficiency test, two sizes of copper pipe which are commonly used for producing coil of air conditioner were used as a case study, Pipe A (diameter of 7.29 mm, thickness of 0.25 mm, length of 10 km) and Pipe B (diameter of 8 mm, thickness of 0.25 mm, length of 10 km). From experiments, the parallel ladder technique can eventually reduce the liquid residual inside the pipe. For Pipe A, the residual was reduced from 1.468 mg to 0.045 mg or 3.65 %. For Pipe B, the residual was reduced from 1.916 mg to 0.054 mg or 7.29%. The average oil residual purged out from Pipe A and Pipe B were 1.42 mg or 96.35%, and 1.86 mg or 92.71%, respectively. It can also be indicated that water and oil residual in the pipe were significantly less than the standard limitation (0.1 mg/m or 30%). © 2011 IEEE.

Tammarugwattana, Narin

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