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 Wysłany: Nie 20:52, 12 Gru 2010 Temat postu: ugg italia A long-term test chamber to maintain a |
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A long-term test chamber to maintain a low dew point method and its application
LowDewPointTemperaturePerenniallyjIHong, JINMao-chang,[link widoczny dla zalogowanych], CAOPei-wei, ZHANGChi-jun (1.StatekeyI.aboratoyElectronicThinFilmsandIntegratedDevices, UniversityofElectronicScienceandTechnologyofChina,[link widoczny dla zalogowanych], Chengdu610054, China; 2.95989ArmyofPIA, Beijing100076, China) Abstract: Theinstallationandprincipleofthetestroommaintainingalowdewpointtemperatureusingthetape5Amolecularsievesinthelong-termarediscussed. Themethodandresultforteststabilitywithalong-termusingforasensorsareintroduced. Keywords: dewpointsensors; molecularsieves; long-termstability. New humidity sensor resistance to chemical interference experiments reported Lizeng Bing,[link widoczny dla zalogowanych], Xiong Ye-dong (Vaisala (Beijing) Technology Co., Ltd. meteorological measurements, Beijing 100027) Abstract: A new improved resistance to chemical interference temperature sensor, anti-chemical interference experiments laboratory and a typical application environment. Compared with the reference of the sensor, the new sensor in the vast majority of tests showed a smaller measurement error, and resistance to high concentrations in the laboratory and on-site chemical interference in long-term stability test showed excellent. Keywords: Humidity sensor; capacitance sensor; chemical interference; chemical drift; Characteristics Test 0 Introduction humidity measurements for most occasions, the humidity sensor in not only exposed to water vapor, but also exposure to chemicals. Water vapor of the chemical substances will spread to interfere with the sensor measurements, in normal office air, will the existence of such gases, such as nitrogen oxide (NO), SO, disinfectants and various organic solvents are floating in the air. As a number of gases and water vapor sensors based on the impact of material response is very slow, in most cases up to several weeks or months, it is generally known as the sensor's 'drift' or 'aging', rather than chemical (material) interference 【1]. Cope with chemical interference or drift of the methods are generally two types of conditions set under the eye calibration cycle, the other is to improve the sensor robustness. In some cases can remove the sense of heated sensors in the wet chemical polymers, but also to prevent their intrusion. In this article, the heating method is called chemical cleaning (Chemicalpurge). l the purpose of resistance to chemical interference experiment is to study the new type of humidity sensor's performance in these substances,[link widoczny dla zalogowanych], especially the tolerance of chemicals. Communication author: Li Zengbing (1962 a), male, engineer, in the temperature and humidity, dew point instrument sales. Sensors have been deliberately placed in extreme situations in order to examine the authenticity of their energy. 2 method first tests the performance of simple sensors, such as the sensor measuring circuit without any compensation,[link widoczny dla zalogowanych], heating compensation. Capacitance of the sensor measurement is used by LCR table for three. However, in some experiments, these sensors have been installed in the Vaisala humidity transmitter. These experiments, sensors and instruments are placed in a different chemical environment, after a certain period after being sent to Vaisala, a calibration laboratory to be measured in the experiment box. Assume that these sensors were not chemical interference from the chemical delivery process and to test the experimental box to remove the delay caused by other factors after. Test sites and transportation carefully considered ways to eliminate or reduce all factors that may affect the results. 2.1 Measurement of all the relative humidity generated by saturated salt solution, each time measurements were generated in the same salt solution in the humidity. Salt solution produces easily affected by temperature, humidity, in addition to other known factors of uncertainty 【2]. The main error in the experiment comes from the salt bath temperature and the difference in ambient temperature, followed by large errors affect the temperature of the laboratory wave
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