Measuring & Application of a Surface-type Thermocouple

• Main Authors: Yi-Hsun Lin, 林宜勳
• Other Authors: 韓麗龍
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/yc88bf

碩士 === 國立臺北科技大學 === 機電整合研究所 === 98 === Temperature measuring is the basis of various measurements. Thermocouple is a widely used device for measuring temperature with various forms of sensing elements on one end, such as slice type, coil type, roller type, board type, and magnetic type, etc. There are 9 calibration types --- K, E, J, T, R, B, S, N, and C --- for thermocouple wire and compensation wire. This research focuses on the measuring error and response rate of surface-type thermocouples (K type) including the correct measuring methods, the types of welding joint type, the dimensions of thermocouple wire (width and thickness), and the types of sensing elements (single slice type, triple slice type, coil type, and roller type). Study results show: (1) the accuracy and response rate are not influenced by the types of welding joint. (2) the dimensions (width and thickness) of thermocouple wire is irrelevant to the accuracy, but is relevant to the response rate: the narrower or the thinner, the quicker. (3) both single slice type and triple slice type can precisely measure the temperature, however, single slice type may result in deviation from testing point and inaccuracy because of the worker’s inappropriate operation. The triple slice type will not, in view of the extra support from the both slices next to the sensing one. (4) coil type is slower than that of slice type on response rate, but coil type can endure higher temperature, be more flexible, last longer, and apply on the rugged surface. (5) roller type responses faster when is applied on rolling surface than on static status, but friction coefficient needs to be taken into consideration for accuracy.