低温多效蒸馏淡化装置温度仪表选型

正确的选择和安装温度仪表测量元件，对低温多效蒸馏（MED）淡化安全经济稳定运行显得尤为重要。文章介绍了常用的几种温度仪表，针对MED淡化装置工艺和设备特点。遴选了适用的温度仪表。并进行了实验和应用。结果表明：优选的温度仪表在预定的测点下正确安装，通过改变测温元件插入深度，准确的测量装置各部分的温度工况，满足使用要求。     

双金属冰箱温度计校准方法及不确定度研究

根据笔者多年从事温度仪表、温湿度仪表的校准经验,探讨了双金属冰箱温度计的校准方法,并对校准结果的测量不确定度评定进行了详细分析,为从事双金属冰箱温度计计量校准的同行提供参考。     

大风起,正扬帆--访重庆市大正温度仪表有限公司总经理周洪琴先生

记者：首先请您介绍一下贵公司的发展历程。 周总：重庆市大正温度仪表有限公司的前身是“重庆北碚温度仪表厂”，地处风景秀丽的中国仪表之都——重庆北碚，成立于1995年，于2001年5月改制更名。公司注册资本518万元，现有职工68人，专业制造热电偶、热电阻、补偿导线、双金属温度计、铠装电加热器、显示控制仪表等产品。正在北碚区国家大学科技园建设的新厂房占地16亩，厂房面积12800m^2，计划2009年底入住。     

核电厂严重事故下安全壳内消氢技术研究

近年来,伴随我国电力需求的日益增长,核电能源作为一种较为环保且清洁能源备受关注和重视。然而,核电厂严重事故的发生,尤其是福岛氢气爆炸事故,不仅我国乃至全球均对核电厂安全提出了更进一步的要求。鉴于此,本研究在分析核电厂严重事故下安全壳内氢气源的基础上,着重介绍了移动式氢复合器、非能动氢气复合器以及氢气点火器三种安全壳内消氢技术,并对其进行了比较,以期为进一步改造核电厂安全壳内消氢技术提供借鉴和参考。     

浅析MTO装置温度仪表的设计选型

最近几年,国内新建了多套甲醇制烯烃(MTO)装置,温度仪表作为最基础的仪表之一,在MTO装置的长周期稳定运行过程中发挥着重要作用。笔者总结了几个项目的工程经验,调研了已投产MTO装置的运行情况,简要介绍了MTO装置温度仪表的设计选型原则,重点介绍了反应再生部分的特殊热电偶的选型及相关要点。笔者旨在通过本文的相关论述和探讨,为工程人员对MTO装置温度仪表的合理应用和设计选型提供一点启示。     

基于LS-SVM的机械式温度仪表误差预测研究

机械式温度仪表在测量过程中易受到环境温度、毛细管长度以及内部机构影响而出现测量精度不高、非线性的情况,针对这些问题以液体压力式温度仪表作为研究对象,提出了基于最小二乘支持向量机(LS-SVM)的温度误差建模预测的方法。通过分析液体压力式温度仪表的测温结构和误差影响因素,将环境温度及毛细管长度等特征参数作为模型输入,将误差值及误差随毛细管长度的变化率作为输出。根据回归预测的原理,利用网格搜索和交叉验证的方法寻找最优参数组合,建立液体压力式温度仪表的误差预测模型。实验结果表明,该模型可以有效地描述温度误差,并将此建模方法与常用的支持向量机回归建模方法进行比较,基于LS-SVM得到的误差预测模型精度较高、推广能力强,可以对机械式温度仪表进行补偿,为探索机械式温度仪表自适应补偿机构提供理论依据。     

核电站用温度仪表套管水压试验方案探讨

文章介绍了核电站用温度仪表套管的类型,分析了对其进行水压试验的目的和实际操作方法,并对该试验的实际效果进行了分析,旨在探讨一种既能快速、准确检验缺陷,又利于工程实际的缺陷探测方案。     

基于丝杠传动的水下远距离精确垂直输送系统设计

首先对核电厂水下维修和堆内构件维修工况进行了介绍。通过分析设备水下运行的特点,提出了基于滚珠丝杆传动的水下远距离精确垂直输送的方案,并列出丝杠的关键计算分析,以及驱动控制计算和人机界面设计。该系统为核电厂堆内构件乃至水下维修提供了一个定位精确、运行可靠、适用性广的水下移动维修平台。     

核电站温度仪表应用分析

结合福清核电一期工程中温度仪表的选型设计,比较了核电站常用测温仪表的不同特点以及1E级与NC级温度传感器技术要求,从量程和精度上分析了温度仪表的设计需求,并规范了核电站测温元件套管的选型和应用要求。其经验和方法对其他工业温度仪表应用有一定的参考意义。     

大风起，正扬耖——访重庆市大正温度仪表有限公司总经理周洪琴先生

记者：首先请您介绍一下贵公司的发展历程。 周总：重庆市大正温度仪表有限公司的前身是“重庆北碚温度仪表厂”,地处风景秀丽的中国仪表之都——重庆北碚,成立于1995年,于2001年5月改制更名。公司注册资本518万元,现有职工68人,专业制造热电偶、热电阻、补偿导线、双金属温度计、铠装电加热器、显示控制仪表等产品。正在北碚区国家大学科技园建设的新厂房占地16亩,厂房面积12800m^2,计划2009年底入住。     

百叶箱与通风防辐射罩的温度对比观测结果分析

通过分析郑州国家基准气象观测站2a的外场对比观测试验,对比分析了百叶箱与不同通风防辐射罩性能和差异。本次对比观测试验结果表明:不同的防辐射罩由于结构差异、体积差异和通风差异呈现相对较大的温度差:白天高温阶段,t玻璃钢t自然通风t强制通风;夜间低温阶段,t强制通风t玻璃钢t自然通风;日平均气温,t玻璃钢t强制通风。     

THI-700L红外温度计的通信协议分析及自动测量系统的构建

THI-700L是一款非接触式红外温度计,其带有PC端的控制软件,但是,由于该软件不能进行二次开发,给应用带来了不便。文章对温度计与附属软件间通信协议进行了分析,同时介绍了基于LabVIEW的控制软件的设计与实现。该软件实现了被测物体温度的多种显示方式与警告报错及数据存储等功能,解决了原附属软件不能集成到其他测控系统中的问题。实验表明,所设计软件可正确显示温度计的测量结果。     

OS530系列红外辐射温度表测量地表温度的应用

本文介绍了OMEGA公司OS530系列红外辐射温度表测量地表温度的工作原理和使用方法，并利用实测资料分析和讨论了该系列红外辐射温度表在地表温度测量中的使用和误差订正。     

配热电阻的三线制温度数显仪的探讨

针对使用中出现的三线制温度数显仪接线不当带来的显示不准确问题。对显示仪的内部线路进行理论分析,并结合实验,提出在长距离接线（导线阻值不能忽略）时三线制的最佳连接方法。     

基于K-803B 8路热电偶调理板焊接温度测量仪研制

开发出一种基于两块K-803B8路热电偶调理板芯片的焊接温度场测量仪。介绍了测温系统的硬件组成和工作原理,通过USB2010芯片,软件设计将热电偶采集数据传输给PC机,将热电偶工作端热电势值转换为对应的被测点温度值。测温系统具有图形动态显示和数据存储功能。经测试该测量仪具有良好的测量精度和实时传输功能,性能稳定,具有方便携带,即插即用等特点。     

Cyclic fatigue resistance and energy dispersive X‐ray spectroscopy analysis of novel heat‐treated nickel–titanium instruments at body temperature

The aim of this study was to evaluate the cyclic fatigue resistance of Dia‐X, WaveOne Gold and One Curve files in a water bath at intracanal temperature (35°C). Thirty‐nine instruments Dia‐X, WaveOne Gold, and One Curve systems (n = 13) were tested in an artificial canal with a curvature angle of 60° and a radius of 3 mm. A water bath setup at a temperature of 35°C was used to simulate the intracanal temperature and time to fracture (TTF) as seconds was recorded. The mean data were analyzed statistically using one‐way ANOVA, and post hoc Tukey test (p = .05). The fractured surface of the instruments was examined with scanning electron microscopy (SEM) and chemical composition of the instruments were investigated with energy dispersive X‐ray spectroscopy (EDS). Statistically significant differences were detected in TTF values of all the systems as follows: One Curve > WaveOne Gold > Dia‐X (p < .05). One Curve instruments demonstrated the highest TTF values in all the tested instruments. The EDS microanalysis revealed similar NiTi composition of on the surface of One Curve, WaveOne Gold, and Dia‐X instruments. The novel manufacturing process, including C‐wire heat treatment and the variable cross‐section of the One Curve files, could be the main factors affecting the fatigue life of the instruments.     

Comparison of the radiation temperature scales between MIKES and PTB

The radiation temperature scales of PTB and MIKES were compared in the range of 1570–2770 K using four filter radiometers of MIKES, one filter radiometer of PTB, and linear radiation thermometers of both MIKES and PTB. The agreement was partial: two filter radiometers and the linear radiation thermometer of MIKES agreed well with the equipment of PTB, while two filter radiometers deviated from the other equipment. To get a deeper understanding of the reasons of the deviation, the results were studied in terms of both temperature and radiance. The deviation was found constant in terms of radiance. A correction factor was calculated for the radiance level with help of a temperature fixed-point calibration. The use of the correction factor improved the results.     

Correction of temperature dependency of a standard; case-study – magnetic flux density standard

Temperature dependence of measuring instruments represents one of the most influential error sources in measurement of most physical quantities. There are several methods of reducing or cancelling substantial temperature influence on instruments.

In this paper we are describing a calculative correction method in the field of precision magnetic flux density measurements, which involves mathematical correction of the instrument properties. For dc magnetic fields under 5 mT, nuclear magnetic resonance (NMR) measurements are both impractical and time-consuming and in some environments even impossible. To avoid complex NMR measurements, field coils as magnetic flux density transfer standards are often used. A method for correction of an air-cored field coil’s coil-constant in order to take into account its temperature dependence is presented. As a result, instead of a complex NMR measurement only a simple current and temperature measurement were needed to calculate the generated magnetic flux density with relative uncertainty of 0.025%.     

Design and development of a high precision thermocouple based smart industrial thermometer with on line linearisation and data logging feature

Design and development of a high precision thermometer for industrial application is described in this paper. A class-1 grade K-type Thermocouple is considered for this purpose. The conditioned signal is linearised using a 9th order polynomial based on National Institute of Standards and Technology (NIST) data with the help of a 12-bit analog-to-digital converter and a 8-bit microcontroller. The cold junction compensation is achieved using a serial synchronous temperature to digital converter. The linearised data is transmitted for remote monitoring and logging via RS232C. The system is calibrated with 20 calibration point from 0 °C to 200 °C with a low cost calibration setup. The precision index of the system is also calculated.