傳chuan感gan器qi是shi能neng夠gou受shou規gui定ding的de被bei測ce量liang並bing按an照zhao一yi定ding的de規gui律lv轉zhuan換huan成cheng可ke用yong輸shu出chu信xin號hao的de器qi件jian或huo裝zhuang置zhi的de總zong稱cheng，通tong常chang由you敏min感gan元yuan件jian和he轉zhuan換huan元yuan件jian組zu成cheng。當dang傳chuan感gan器qi的de輸shu出chu為wei規gui定ding的de標biao準zhun信xin號hao時shi
，則ze稱cheng為wei變bian送song器qi。

 

　　變bian送song器qi的de概gai念nian是shi將jiang非fei標biao準zhun電dian信xin號hao轉zhuan換huan為wei標biao準zhun電dian信xin號hao的de儀yi器qi，傳chuan感gan器qi則ze是shi將jiang物wu理li信xin號hao轉zhuan換huan為wei電dian信xin號hao的de器qi件jian，過guo去qu常chang講jiang物wu理li信xin號hao，現xian在zai其qi他ta信xin號hao也ye有you了le。一yi次ci儀yi表biao指zhi現xian場chang測ce量liang儀yi表biao或huo基ji地di控kong製zhi表biao

，二er次ci儀yi表biao指zhi利li用yong一yi次ci表biao信xin號hao完wan成cheng其qi他ta功gong能neng：諸如控製

，顯示等功能的儀表。

 

　　傳感器和變送器本是熱工儀表的概念。傳感器是把非電物理量如溫度、壓力

、液位
、物料、氣體特性等轉換成電信號或把物理量如壓力、液ye位wei等deng直zhi接jie送song到dao變bian送song器qi。變bian送song器qi則ze是shi把ba傳chuan感gan器qi采cai集ji到dao的de微wei弱ruo的de電dian信xin號hao放fang大da以yi便bian轉zhuan送song或huo啟qi動dong控kong製zhi元yuan件jian。或huo將jiang傳chuan感gan器qi輸shu入ru的de非fei電dian量liang轉zhuan換huan成cheng電dian信xin號hao同tong時shi放fang大da以yi便bian供gong遠yuan方fang測ce量liang和he控kong製zhi的de信xin號hao源yuan。根gen據ju需xu要yao還hai可ke將jiang模mo擬ni量liang變bian換huan為wei數shu字zi量liang。傳chuan感gan器qi和he變bian送song器qi一yi同tong構gou成cheng自zi動dong控kong製zhi的de監jian測ce信xin號hao源yuan。不bu同tong的de物wu理li量liang需xu要yao不bu同tong的de傳chuan感gan器qi和he相xiang應ying的de變bian送song器qi。還hai有you一yi種zhong變bian送song器qi不bu是shi將jiang物wu理li量liang變bian換huan成cheng電dian信xin號hao，如ru一yi種zhong鍋guo爐lu水shui位wei計ji的de“差壓變送器”，他(ta)是(shi)將(jiang)液(ye)位(wei)傳(chuan)感(gan)器(qi)裏(li)的(de)下(xia)部(bu)的(de)水(shui)和(he)上(shang)部(bu)蒸(zheng)汽(qi)的(de)冷(leng)凝(ning)水(shui)通(tong)過(guo)儀(yi)表(biao)管(guan)送(song)到(dao)變(bian)送(song)器(qi)的(de)波(bo)紋(wen)管(guan)兩(liang)側(ce)
，以(yi)波(bo)紋(wen)管(guan)兩(liang)側(ce)的(de)差(cha)壓(ya)帶(dai)動(dong)機(ji)械(xie)放(fang)大(da)裝(zhuang)置(zhi)用(yong)指(zhi)針(zhen)指(zhi)示(shi)水(shui)位(wei)的(de)一(yi)種(zhong)遠(yuan)方(fang)儀(yi)表(biao)。當(dang)然(ran)還(hai)有(you)把(ba)電(dian)氣(qi)模(mo)擬(ni)量(liang)變(bian)換(huan)成(cheng)數(shu)字(zi)量(liang)的(de)也(ye)可(ke)以(yi)叫(jiao)變(bian)送(song)器(qi)。以(yi)上(shang)隻(zhi)是(shi)從(cong)概(gai)念(nian)上(shang)說(shuo)明(ming)傳(chuan)感(gan)器(qi)和(he)變(bian)送(song)器(qi)的(de)區(qu)別(bie)。