ugg stivali Combustible gas detection alarm indica

Combustible gas detection alarm indication error of measurement of Uncertainty

And should therefore be assessed by B class method. Standard butane gas was approved by the State Quality and Technical Supervision of secondary reference material, the relative uncertainty of concentration O / = 1%, coverage factor = 1.96. Standard uncertainty Ⅱ (.) As follows: the concentration of 1: Ⅱ (0) = (1 × 10 × 10%) / 1.96 = 0. O5% Concentration 2: Ⅱ (0): (1 × 10 × 40%) / 1.96 = 0.20% concentration of 3 ://,( 0) = (1 × 10 × 60%) / 1.96 = 0.3l% 4 combined standard uncertainty assessment of model sensitivity coefficient of 4.1 △ =- 0 sensitivity coefficients c1 = OAz / O = 1c2: OA ~ -/0r0 = 14.2 standard uncertainty of a summary table ( Table 2) calculated the combined standard uncertainty of 4.3 inputs and input. Independent of each other are not relevant, so the combined standard uncertainty can be obtained the following formula: Ⅱ (△ 1.) = [Clu ()]+[ C2 Ⅱ (o)] concentration of 1: (Si 1.): [0.689 + 0.05]% = 0.690% (continued on page 4l) Yang Qiaoyu: amplitude sensitivity of the accelerometer reference point group of Uncertainty in the low-frequency vibration standard, the unexpected frequency, while the measurement period, so the uncertainty Periodic measurement of the degree component is actually caused. Instructions based on the counter that the period measurement uncertainty of 8 × 1O one, taking into account the error is triggered, time and temperature standards ensure the impact of measurement error is within 0.03%, the u. 10 == 0.03464% sensitivity of the amplitude of the reference point in table 2 standard uncertainty of measurement points and the relative combined uncertainty ■ 3 sensitivity of the amplitude of the reference point relative expanded uncertainty //,(. s) in accordance with national vibration criteria,[link widoczny dla zalogowanych], the relative expanded uncertainty coverage factor of 95% confidence level to take k = 2, that is //,(. s) = k ×//,. (. S) = 2 × 0.2134% = 0.4268% 4 Conclusion This paper introduces the absolute calibration of the laser sensor principles, methods, and the impact of measurement uncertainty analysis of the amount obtained a reference frequency amplitude sensitivity of the expanded uncertainty of calibration. Standard set of low frequency vibration measurement standard set of reference frequency sensitivity of the amplitude of the expanded uncertainty of 0.4268% (95% confidence level), better than the international standard ISO16063-11 sensitivity of amplitude measurement expanded uncertainty 0.5% (reference point) requirements. References: [1] GB/T16063-111999, vibration and shock calibration method for a Part 11: a vibration calibration by laser interferometry 1999. [2] JJG233-1996, piezoelectric accelerometers [s]. Beijing: China Metrology Publishing House, 1996. [3] JJF1059-1999, Evaluation and Expression of Uncertainty in Measurement [s]. Beijing: China Metrology Publishing House. 1999. [4] Ni Incubation. Practical Evaluation of Uncertainty [M]. Beijing: China Metrology Publishing House. 2004. [5] Mao Ching Lake. Measurement Uncertainty training material [M]. Beijing tp Asia certification training center. 2004. [6] JJ1l117-2004, measuring instruments than on the specification [s]. Beijing: China Metrology Publishing House. 2004. [7] Yang, Xue-shan. Engineering Vibration measurement instruments and testing technology. China Metrology Publishing House. 2001. About the author: Yang Qiaoyu, female, engineer. Company: Institute of Engineering Mechanics,[link widoczny dla zalogowanych], China Seismological Bureau. Address: Nangang District,[link widoczny dla zalogowanych], Harbin 150080 Xuefu 29. Received Time: 2007 A l1 a o6 (on the next page 3 Cool

the concentration of 2: u (△ D) = [0.689 0.20]% = 0.715% concentration 3: u (△ D) = [ ,],[link widoczny dla zalogowanych],[(△ D) representing the three measurement points relative combined uncertainty. 5 expanded uncertainty take k = 2, the relative expanded uncertainty: = 2 × 0.755% = 1.51% 6 report measurement uncertainty, said combustible gas detection and alarm indication error of measurement results relative expanded uncertainty is: = 1.51% k = 2 Author: Zhang Yan, female, engineer. Company: Wuhan measurement for tests (Study). Address: 430050 Wuhan Hanyang Avenue,[link widoczny dla zalogowanych], No. l19. Received :2007 -07-20

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