分流式湿度发生器的设计原理

本文介绍了分流式湿度发生器的工作流程,详细地阐述了发生器湿度量值计算的推导过程,并给出了在一般的校准或过程中经常使用的简化公式。     

Swsy-F分流法湿度发生器的研制

介绍了Swsy-F分流法湿度发生器装置。Swsy-F分流式湿度发生器设计基于分流法的原理,是目前应用最广泛的二级标准湿度设备,适用于校准各种湿度传感器、变送器及湿敏元件等,同时还可以对工作用露点仪进行检定和校准。本装置具有湿度发生范围宽和湿度变换快的优点,相对湿度范围:5%～95%RH(5～50℃),相对湿度最大允许误差为:±2.0%RH,非常适合对湿度相关产品或者工作用器具动态性能要求高、检定量日益繁重的科研院所和计量单位。     

分流式标准湿度发生器在湿度计检测中的应用

介绍分流式湿度发生器的工作原理,及其性能指标,在湿度计检测中的应用,以及整套系统的不确定度分析。     

分流式湿度发生器设计及不确定度分析

介绍分流式标准湿度发生器的工作原理及结构设计,详细分析了分流式标准湿度发生器测量不确定度来源及合成。     

Swsy-F分流法湿度发生器控制系统的研制

介绍了适用于湿度校准实验室使用的Swsy-F分流法湿度发生器,阐述了其工作原理,控制系统硬件、软件的组成和功能,给出了此装置的技术性能和实验结果.该装置为湿度仪的校准提供了一种准确、可靠的湿度发生设备.     

压缩系数对双压法标准湿度发生器结果的影响

在实际气体状态方程基础上,通过引入混合湿气的压缩系数,推导出新的双压法标准湿度发生器计算公式,公式中通过修正压缩系数的影响,提高发生器在低温时露点和相对湿度的准确度。     

分流法湿度发生器在使用时的注意事项

本文从通过介绍分流法湿度发生器原理,描述了制备不同露点的湿度发生器模型,最后通过一个具体的湿度发生器的使用详述了分流法湿度发生器在使用过程中的注意事项。     

分流法湿度发生器在使用时的注意事项

本文从通过介绍分流法湿度发生器原理,描述了制备不同露点的湿度发生器模型,最后通过一个具体的湿度发生器的使用详述了分流法湿度发生器在使用过程中的注意事项。     

便携式高温露点湿度发生器的研制

为了解决高温露点的溯源问题,研制了一种便携式高温露点湿度发生器,能够现场开展室温至95℃的各种工业露点仪的校准,配合测试腔和高温恒温环境可以开展高温温湿度计的校准,经比对表明:该发生器在露点温度95℃时,其最大允差优于1.0℃。该发生器体积小、重量轻,非常适合现场开展校准工作。     

高稳定性的湿度发生器——双压法湿度发生器的工作原理及特性简介

本文重点讨论了双压法湿度发生器的工作原理及奥地利益加义公司（E＋E Elektronik）生产的HUMOR10型湿度发生器的特性。[编者按]     

Swsy-A型双压法湿度发生器的研制

介绍了适用于湿度校准实验室和现场使用的Swsy-A型双压法湿度发生器，阐述了其工作原理，并给出了技术指标、性能、试验结果和分析结论。     

The New KRISS Low Frost-Point Humidity Generator

A new low frost-point humidity generator (LFPG) has been designed, and its performance has been tested, in order to extend the calibration capabilities to the low frost-point range at KRISS. The water vapor–gas mixture is generated by saturating air with water vapor over a surface of an ice-coated saturator under the conditions of constant temperature and pressure. This LFPG covers a range of frost point from  − 99 °C to  − 40 °C. The temperature of the saturator, which is controlled by thermoelectric devices and a two-stage mechanical refrigeration system, is stable within 5 mK, and the difference between the saturator temperature and the frost point generated at the saturator outlet is less than 20 mK. This stability is achieved by using oxygen-free high-conductivity copper materials as the saturator body, and applying a precision PID temperature control system. The performance of this new LFPG system is compared with the KRISS standard two-temperature generator in the frost-point range ( − 80 to  − 40) °C, and its performance is tested with a quartz crystal microbalance (QCM), which was built at KRISS, to  − 91 °C.     

A Simple Humidity Generator for Relative Humidity Calibrations

At present, the South African national humidity measurement standards, maintained by NMISA, consist of two chilled-mirror hygrometers operating from (−75 to 20) °Cdp and unsaturated salt solutions covering the range (5 to 95) %rh. To reduce measurement uncertainties and to obtain traceability to local measurement standards for temperature and pressure, it is desired to replace the salt solutions by a dew-point generator for relative humidity calibrations from (5 to 95) %rh (5 to 60) °C, equivalent to a dew-point range of (−30 to 59) °Cdp. Required uncertainties in relative humidity (at a coverage factor of k = 2) are (0.1 to 1.2) %rh. This article describes the design and evaluation of a two-pressure humidity generator intended to satisfy this requirement. The saturator consists of a coil of stainless steel tubing immersed in a 70 l stirred water bath. Pressure reduction is accomplished using a throttling valve adjusted by a stepper motor, and hygrometers being calibrated are sealed into a small test chamber contained in a larger temperature-controlled chamber. The results of the following performance tests are presented:

Miniaturized Two-Pressure Generator for Relative Humidity

The concept and design of a miniaturized two-pressure humidity generator are presented. The generator is suitable for achieving relative humidity ranging from 10% to 95% with uncertainties of under 1% at ambient temperature and can be used for the calibration of relative humidity instruments in the laboratory and on site. By virtue of the concept, the relative humidity achieved is traced to only two pressure measurements. Further references are not necessary. A special adjustment algorithm enables standard industrial pressure sensors to be used. The two pressure sensors are synchronized by aligning their readings at ambient pressure. The resulting correlation of the uncertainties leads to very small systematic errors in the humidity display. Each humidity generator can still be individually adjusted through comparison with a chilled-mirror hygrometer, the total uncertainty of the generator being largely determined by the uncertainty of this hygrometer. Any drift of the pressure sensors that occurs can be compensated at any time by performing an alignment at ambient pressure without changing the individual adjustment of the generator. It can be demonstrated that the uncertainty of the displayed humidity remains practically unchanged over the course of a year by virtue of this alignment process.     

便携式渗透法湿度发生器的研制

介绍了一种便携式渗透法湿度发生器的工作原理及研制过程。详细阐述了该湿度发生器的恒温体设计、渗透管选择、气路的优化设计等。该便携式温度发生器可产生-30,-40,-50,-60℃四路定点样气,其发生的低露点标准气体最大误差值在±0.4℃内且总重量仅有10kg左右。试验证明该装置性能稳定可靠,适合开展工业露点仪的现场校准工作。     

Swsy-S型低霜点湿度发生器的研制

介绍了适用于湿度校准实验室使用的Swsy-S型低霜点湿度发生器,阐述了其工作原理、硬件组成和软件功能,并给出了实验结果和分析结论,该装置为露点湿度计校准提供了一种准确、可靠的湿度发生设备.     

一种多路外渗式湿度发生器的研制

介绍了一种多路外渗式湿度发生器的工作原理及研制过程.详细阐述了多路外渗式湿度发生器的渗透管选择、多渗透管气路选通方法及硬件结构.通过试验验证,证明了该装置工作准确可靠.     

Uncertainty of the Kriss Low Frost-Point Humidity Generator

The KRISS low frost-point humidity generator (LFPG), was developed in 2006 for the frost-point range (?95 to ?40)°C in order to extend calibration capabilities. In this paper, the evaluation of the generator??s uncertainty budget is reported for which each uncertainty component was categorized and estimated by experiment and calculation. The uncertainty of the LFPG depends on the generated frost point, gas flow rate, and change of moisture concentration in transportation. The standard uncertainty of LFPG is less than 32 mK in the frost-point range from ?70?°C to ?40?°C. However, in the lower frost-point range, the uncertainty increases to 137 mK at ?90?°C, and this is mainly due to water adsorption or desorption in the transportation tubing from saturator to hygrometer.