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热电偶测温为什么要带冷端温度补偿?

点击次数:   发布时间:2018-04-16 11:10:12

  热电偶测温为什么要带冷端温度补偿?

  答:因为分度表上,冷端的温度为零摄氏度。测量现场冷端温度一般不是零摄氏度,所以要进行冷端补偿。

        热电偶冷端补偿介绍:

  LILUNSHANGREDIANOUCELIANGSHIYILENGDUANZAILINGDUWEIBIAOZHUNCELIANGDE,RANER,TONGCHANGCELIANGSHIYIBIAOSHICHUYUSHIWENZHIXIADE,YOUYULENGDUANBUWEILINGDU,ZAOCHENGREDIANSHICHAJIANXIAO,SHICELIANGBUZHUN,CHUXIANCUOWU。SUOZUODEBUCHANGCUOSHIJIUSHILENGDUANWENDUBUCHANG .

黄大仙玄机资料独家   REDIANOUCELIANGWENDUSHIYAOQIUQILENGDUAN(CELIANGDUANWEIREDUAN,TONGGUOYINXIANYUCELIANGDIANLULIANJIEDEDUANCHENGWEILENGDUAN)DEWENDUBAOCHIBUBIAN,QIREDIANSHIDAXIAOCAIYUCELIANGWENDUCHENGYIDINGDEBILIGUANXI。RUOCELIANGSHI,LENGDUANDE(HUANJING)WENDUBIANHUA,JIANGYINGXIANGYANZHONGCELIANGDEZHUNQUEXING。ZAILENGDUANCAIQUYIDINGCUOSHIBUCHANGYOUYULENGDUANWENDUBIANHUAZAOCHENGDEYINGXIANGCHENGWEIREDIANOUDELENGDUANBUCHANG。

  

  REDIANOUDELENGDUANBUCHANGTONGCHANGCAIYONGZAILENGDUANCHUANLIANYIGEYOUGOUCHENGDEDIANQIAO。DIANQIAODESANGEQIAOBEIWEIBIAOZHUNDIANZU,LINGWAIYOUYIGEQIAOBEIYOU(TONG)GOUCHENG。DANGLENGDUANWENDUBIANHUA(BIRUSHENGGAO),REDIANOUCHANSHENGDEREDIANSHIYEJIANGBIANHUA(JIANXIAO),ERCISHICHUANLIANDIANQIAOZHONGDEREDIANZUZUZHIYEJIANGBIANHUABINGSHIDIANQIAOLIANGDUANDEDIANYAYEFASHENGBIANHUA(SHENGGAO)。RUGUOCANSHUXUANZEDEHAOQIEJIEXIANZHENGQUE,DIANQIAOCHANSHENGDEDIANYAZHENGHAOYUREDIANSHISUIWENDUBIANHUAERBIANHUADELIANGXIANGDENG,ZHENGGEREDIANOUCELIANGHUILUDEZONGSHUCHUDIANYA(DIANSHI)ZHENGHAOZHENSHIFANYINGLESUOCELIANGDEWENDUZHI。

  1.冷端恒温法

  YIBANREDIANOUDINGBIAOSHILENGDUANWENDUYI0℃WEIBIAOZHUN。YINCI,CHANGCHANGJIANGLENGDUANZHIYUBINGSHUIHUNHEWUZHONG,SHIQIWENDUBAOCHIWEIHENGDINGDE0℃。ZAISHIYANSHITIAOJIANXIA,TONGCHANGBALENGDUANFANGZAISHENGYOUJUEYUANYOUDESHIGUANZHONG,RANHOUZAIJIANGQIFANGRUZHUANGMANBINGSHUIHUNHEWUDEBAOWENRONGQIZHONG,SHILENGDUANBAOCHI0℃。

  2.冷端温度校正法

黄大仙玄机资料独家   YOUYUREDIANOUDEWENDUFENDUBIAOSHIZAILENGDUANWENDUBAOCHIZAI0℃DEQINGKUANGXIADEDAODE,YUTAPEITAOSHIYONGDECELIANGDIANLUHUOXIANSHIYIBIAOYOUSHIGENJUZHEIYIGUANXIQUXIANJINXINGKEDUDE,YINCILENGDUANWENDUBUDENGYU0℃SHI,JIUXUDUIYIBIAOZHISHIZHIJIAYIXIUZHENG。RULENGDUANWENDUGAOYU0℃,DANHENGDINGYUt0℃,ZECEDEDEREDIANSHIYAOXIAOYUGAIREDIANOUDEFENDUZHI,WEIQIUDEZHENSHIWENDU,KELIYONGZHONGJIANWENDUFAZE,JIYONGXIASHIJINXINGXIUZHENG:E(t,0)= E(t,t1)+ E(t1,0)

  3.补偿导线法

黄大仙玄机资料独家   WEILESHIREDIANOULENGDUANWENDUBAOCHIHENGDING(ZUIHAOWEI0℃),KEJIANGREDIANOUZUODEHENZHANG,SHILENGDUANYUANLIGONGZUODUAN,BINGLIANTONGCELIANGYIBIAOYIQIFANGZHIDAOHENGWENHUOWENDUBODONGBIJIAOXIAODEDIFANG。DANZHEIZHONGFANGFASHIANZHUANGSHIYONGBUFANGBIAN,ERQIEKENENGHAOFEIXUDUOGUIZHONGDEJINSHUCAILIAO。YINCI,YIBANSHIYONGYIZHONGCHENGWEIBUCHANGDAOXIANDELIANJIEXIANJIANGREDIANOULENGDUANYANSHENCHULAI。ZHEIZHONGDAOXIANZAIYIDINGWENDUFANWEINEI(0~150℃)JUYOUHESUOLIANJIEDEREDIANOUXIANGTONGDEREDIANXINGNENG,RUOSHIYONGLIANJIAJINSHUZHICHENGDEREDIANOU,ZEKEYONGQIBENSHENDECAILIAOZUOWEIBUCHANGDAOXIAN,JIANGLENGDUANYANSHENDAOWENDUHENGDINGDEDIFANG。

  补偿导线在使用中注意事项:

  (1)补偿导线的选择

  BUCHANGDAOXIANYIDINGYAOGENJUSUOSHIYONGDEREDIANOUZHONGLEIHESUOSHIYONGDECHANGHEJINXINGZHENGQUEXUANZE。LIRU,kXINGOUYINGGAIXUANZEkXINGOUDEBUCHANGDAOXIAN,GENJUSHIYONGCHANGHE,XUANZEGONGZUOWENDUFANWEI。TONGCHANGkxGONGZUOWENDUWEI-20~100℃,KUANFANWEIDEWEI-25~200℃。PUTONGJIWUCHAWEI±2.5℃,JINGMIJIWEI±1.5℃。

  (2)接点连接

  YUREDIANOUJIEXIANDUAN2GEJIEDIANJINKENENGJINYIDIAN,JINLIANGBAOCHI2GEJIEDIANWENDUYIZHI。YUYIBIAOJIEXIANDUANLIANJIECHUJINKENENGWENDUYIZHI,YIBIAOJUYOUFENGSHANDEDIFANG,JIEDIANCHUYAOBAOHUBUYAOSHIDEFENGSHANZHICHUIDAOJIEDIAN。

  (3)使用长度

  因为热电偶的信号很低,为微伏级,如果使用的距离过长,信号的衰减和环境中强电的干扰偶合,足可以使热电偶的信号失真,造成测量和控制温度不准确,在控制中严重时会产生温度波动。
  根据我们的经验,通常使用热电偶补偿导线的长度控制在15米内比较好,如果超过15米,建议使用温度变送器进行传送信号。温度变送器黄大仙玄机资料独家是将温度对应的电势值转换成直流电流传送,抗干扰强。

  (4)布线

  BUCHANGDAOXIANBUXIANYIDINGYAOYUANLIDONGLIXIANHEGANRAOYUAN。ZAIBIMIANBULECHUANYUEDEDIFANG,YEJINKENENGCAIYONGJIAOCHAFANGSHI,BUYAOPINGXING。

  (5)PINGBIBUCHANGDAOXIAN

  WEILETIGAOREDIANOULIANJIEXIANDEKANGGANRAOXING,KEYICAIYONGPINGBIBUCHANGDAOXIAN。DUIYUXIANCHANGGANRAOYUANJIAODUODECHANGHE,XIAOGUOJIAOHAO。DANSHIYIDINGYAOJIANGPINGBICENGYANGEJIEDI,FOUZEPINGBICENGBUJINMEIYOUQIDAOPINGBIDEZUOYONG,FANERZENGQIANGGANRAO。

  4.补偿电桥法

黄大仙玄机资料独家   BUCHANGDIANQIAOFASHILIYONGBUPINGHENGDIANQIAOCHANSHENGDEDIANSHILAIBUCHANGREDIANOUYINLENGDUANWENDUBIANHUAERYINQIDEREDIANSHIBIANHUAZHI。BUCHANGDIANQIAOXIANYIBIAOZHUNHUA。

黄大仙玄机资料独家   BUPINGHENGDIANQIAO(JIBUCHANGDIANQIAO)SHIYOUDIANZUR1、R2、R3HERCuZUCHENG。

黄大仙玄机资料独家   QIZHONGR1=R2=R3=1 ;RsSHIYONGWENDUXISHUHENXIAODEMENGTONGSIRAOZHIERCHENGDE;RCuSHIYOUWENDUXISHUJIAODADETONGXIANRAOZHIERCHENGDEBUCHANGDIANZU,0℃SHI,RCu=1 ;RsDEZHIKEGENJUSUOXUANDIANOUDELEIXINGJISUANQUEDING。

黄大仙玄机资料独家   CIQIAOCHUANLIANZAIREDIANOUCELIANGHUILUZHONG,REDIANOULENGDUANYUDIANZURCuGANSHOUXIANGTONGDEWENDU,ZAIMOUYIWENDUXIA(TONGCHANGQU0℃)DIAOZHENGDIANQIAOPINGHENG,SHIR1=R2=R3=RCu。

  DANGLENGDUANWENDUBIANHUASHI,RCuSUIWENDUGAIBIAN,POHUAILEDIANQIAOPINGHENG,CHANSHENGYIBUPINGHENGDIANYA△U,CIDIANYAZEYUREDIANSHIXIANGDIEJIA,YIQISONGRUCELIANGYIBIAO。

黄大仙玄机资料独家   SHIDANGXUANZERsDESHUZHI,KESHIDIANQIAOCHANSHENGDEBUPINGHENGDIANYA△UZAIYIDINGWENDUFANWEINEIJIBENSHANGNENGBUCHANGYOUYULENGDUANWENDUBIANHUAERYINQIDEREDIANSHIBIANHUAZHI。

黄大仙玄机资料独家   ZHEIYANG,DANGLENGDUANWENDUYOUYIDINGBIANHUASHI,YIBIAORENGRANKEJICHUZHENGQUEDEWENDUSHIZHI。

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