用户名: 密码:    忘记密码   注册   在线充值
热电偶装置.一些关于热电偶选择,安装和操作指南  
 【英文标准名称】  Heat meter installation. Some guidelines for selecting, installation and operation of heat meters
 【原文标准名称】  热电偶装置.一些关于热电偶选择,安装和操作指南
 【标准号】  PD CR 13582-1999
 【标准状态】  
 【国别】  英国
 【发布日期】  2008-03-31
 【实施或试行日期】  
 【发布单位】  英国标准学会(GB-BSI)
 【起草单位】  
 【标准类型】  ()
 【标准水平】  ()
 【中文主题词】  
 【英文主题词】  
 【摘要】  A heat meter is composed of three parts, a flow sensor, a temperature sensor pair and a calculator.The calculator is a unit which calculates volumes and energy consumption using the values from thetemperature sensors and the flow sensor.The most common type of temperature sensor is a resistance thermometer of platinum type Pt 100, Pt500 or Pt 1000. The sensors measure the temperature difference between the incoming and outgoingliquid .The flow sensor is probably the most troublesome assembly of the heat meter. Despite an accuracyrequirement of only 4-10% it is very easy to fall outside these limits. In order to counter these effects asfar as possible, there follows a summary of the various types of flow sensor and their advantages anddisadvantages.The sizing of meters to match their required duty frequently turns out to have been incorrectly estimatedwhen the heating plant commences operation. In most cases heat meters that are too large for their eventual duty are specified and accuracy at low load suffers as a result. Whilst this paper will give someguidance on essentials, it is felt that more information on this topic would be welcomed.Heat meter accuracies at times of rapidly changing heat demand are unlikely to be high. Whilst at timesof low demand the effect of meter inaccuracy in terms of lost revenue is likely to be small, rapid changesinvolving high demands on the network may possibly have important implications in lost revenue if meterreaction to rapid changes is slow. Research into the subject seems to have been largely neglected sofar.The most commonly used types of flow sensors have been listed in Annex B and the effect on accuracyof different types of disturbances for each of the listed types of flow sensors are considered.There is little information on the effects of flow and flow disturbances on the service life of the flowsensor, as distinct from its effect on the sensor’s accuracy. To be welcomed, therefore, is the long termresearch project on this topic initiated in Germany which should result in useful data.
 【中国标准分类号】  K61
 【国际标准分类号】  17_200_10
 【页数】  30P.;A4
 【正文语种】  英语
索取全文
标准全文由山东省标准化研究院向您提供(不能使用知网账号下载全文),需向山东省标准化研究院支付相关费用后,方可获得标准。

 

       

标准间关联  
本领域专利与科技成果  
本标准研制背景
本标准应用动态
所涉核心技术研究动态
京ICP证040431号 互联网出版许可证 新出网证(京)字008号 京公网安备11010802014875号
© 2014中国知网(CNKI) 《中国学术期刊(光盘版)》电子杂志社有限公司
服务热线:400-810-9888 订卡热线:800-810-6613
在线咨询:http://help.cnki.net 客服中心:http://service.cnki.net 电子邮件:help@cnki.net