可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)儀(yi)由檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)和探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)兩部分(fen)(fen)組(zu)成(cheng)，具有(you)(you)檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)及探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)功能。可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)儀(yi)檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)部分(fen)(fen)的(de)(de)原(yuan)理是儀(yi)器(qi)(qi)的(de)(de)傳感器(qi)(qi)采用檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)元件(jian)與(yu)(yu)固定(ding)電(dian)(dian)(dian)阻和調零(ling)電(dian)(dian)(dian)位器(qi)(qi)構成(cheng)檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)橋路(lu)(lu)。橋路(lu)(lu)以鉑絲為載體(ti)催化(hua)元件(jian)，通(tong)(tong)電(dian)(dian)(dian)后鉑絲溫度上(shang)升至(zhi)工作溫度，空氣(qi)(qi)(qi)以自然擴散方(fang)(fang)式(shi)或(huo)其它方(fang)(fang)式(shi)到達元件(jian)表面。當(dang)空氣(qi)(qi)(qi)中無可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)時，橋路(lu)(lu)輸出(chu)(chu)(chu)為零(ling)，當(dang)空氣(qi)(qi)(qi)中含有(you)(you)可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)并擴散到檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)元件(jian)上(shang)時，由于催化(hua)作用產生無焰(yan)燃(ran)燒(shao)，使檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)元件(jian)溫度升高(gao)，鉑絲電(dian)(dian)(dian)阻增(zeng)大(da)，使橋路(lu)(lu)失去平衡(heng)，從而有(you)(you)一(yi)電(dian)(dian)(dian)壓信號輸出(chu)(chu)(chu)，這(zhe)個電(dian)(dian)(dian)壓的(de)(de)大(da)小與(yu)(yu)可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)濃(nong)(nong)度成(cheng)正(zheng)比，信號經(jing)放(fang)大(da)，模數轉換，通(tong)(tong)過(guo)液體(ti)顯(xian)示(shi)器(qi)(qi)顯(xian)示(shi)出(chu)(chu)(chu)可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)的(de)(de)濃(nong)(nong)度。探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)部分(fen)(fen)的(de)(de)原(yuan)理是當(dang)被測(ce)(ce)(ce)(ce)(ce)(ce)(ce)可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)濃(nong)(nong)度過(guo)限(xian)定(ding)值(zhi)(zhi)時，經(jing)過(guo)放(fang)大(da)的(de)(de)橋路(lu)(lu)輸出(chu)(chu)(chu)電(dian)(dian)(dian)壓與(yu)(yu)電(dian)(dian)(dian)路(lu)(lu)探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)設定(ding)電(dian)(dian)(dian)壓，通(tong)(tong)過(guo)電(dian)(dian)(dian)壓比較器(qi)(qi)，方(fang)(fang)波發(fa)生器(qi)(qi)輸出(chu)(chu)(chu)一(yi)組(zu)方(fang)(fang)波信號，控制聲，光探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)路(lu)(lu)，蜂(feng)鳴器(qi)(qi)發(fa)生連續聲音，發(fa)光二極管閃亮，發(fa)出(chu)(chu)(chu)探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)信號。從可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)儀(yi)原(yuan)理可(ke)(ke)(ke)(ke)以看出(chu)(chu)(chu)如(ru)果出(chu)(chu)(chu)現(xian)(xian)電(dian)(dian)(dian)磁(ci)干擾(rao)會影響(xiang)探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)的(de)(de)信號，出(chu)(chu)(chu)現(xian)(xian)數據偏(pian)差；如(ru)果出(chu)(chu)(chu)現(xian)(xian)碰撞、震動從而造成(cheng)設備斷路(lu)(lu)會現(xian)(xian)探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)失靈；如(ru)果環境過(guo)分(fen)(fen)潮濕或(huo)設備進水，也有(you)(you)可(ke)(ke)(ke)(ke)能會引起可(ke)(ke)(ke)(ke)燃(ran)性(xing)氣(qi)(qi)(qi)體(ti)檢(jian)(jian)(jian)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)儀(yi)出(chu)(chu)(chu)現(xian)(xian)短路(lu)(lu)，或(huo)線路(lu)(lu)電(dian)(dian)(dian)阻值(zhi)(zhi)發(fa)生變化(hua)，出(chu)(chu)(chu)現(xian)(xian)探(tan)(tan)(tan)(tan)測(ce)(ce)(ce)(ce)(ce)(ce)(ce)故障。
 

1、可燃氣(qi)體(ti)檢測儀是(shi)工業與民用建筑中安裝使用的是(shi)對(dui)單一或多種可燃氣(qi)體(ti)濃(nong)度(du)發出響應(ying)的探測器。日常使用多的可燃(ran)性氣體(ti)檢測儀是(shi)催化型(xing)(xing)(xing)可燃(ran)(ran)(ran)性氣(qi)體檢(jian)測(ce)儀(yi)和半(ban)導(dao)體型(xing)(xing)(xing)可燃(ran)(ran)(ran)性氣(qi)體檢(jian)測(ce)儀(yi)兩種類(lei)型(xing)(xing)(xing)。飯店、賓館、制作(zuo)間等使(shi)(shi)用(yong)煤氣(qi)、天然氣(qi)、液化氣(qi)的場所主要使(shi)(shi)用(yong)半(ban)導(dao)體型(xing)(xing)(xing)可燃(ran)(ran)(ran)性氣(qi)體檢(jian)測(ce)儀(yi)，散發可燃(ran)(ran)(ran)氣(qi)體、可燃(ran)(ran)(ran)蒸(zheng)汽(qi)的工業場所主要使(shi)(shi)用(yong)催化型(xing)(xing)(xing)可燃(ran)(ran)(ran)性氣(qi)體檢(jian)測(ce)儀(yi)。 　　
 
2、催化型可燃(ran)氣體(ti)檢測儀是利用難熔金(jin)屬鉑絲加熱后(hou)的電(dian)阻變(bian)化(hua)來測(ce)定(ding)可燃氣體濃(nong)度 。當可燃氣體進入探測器時，在鉑絲表面引起氧化反應（無焰燃燒），其產生的熱量使鉑絲的溫度升高，而鉑絲的電阻率便發生變化，所以當遇到高溫等因素時鉑絲的溫度發生變化，而鉑絲的電阻率便發生變化,探測的數據也(ye)會(hui)發(fa)生變化。 　　
 
3、半(ban)導(dao)體(ti)(ti)型可(ke)(ke)燃(ran)氣(qi)體(ti)(ti)檢(jian)測儀(yi)是利用半(ban)導(dao)體(ti)(ti)表面電(dian)阻變化來測定可(ke)(ke)燃(ran)氣(qi)體(ti)(ti)濃(nong)度。半(ban)導(dao)體(ti)(ti)可(ke)(ke)燃(ran)性氣(qi)體(ti)(ti)檢(jian)測儀(yi)用靈(ling)敏(min)度較高(gao)的氣(qi)敏(min)半(ban)導(dao)體(ti)(ti)元件，它在工(gong)作狀態時，遇到可(ke)(ke)燃(ran)氣(qi)體(ti)(ti)，半(ban)導(dao)體(ti)(ti)電(dian)阻下(xia)降，下(xia)降值與(yu)可(ke)(ke)燃(ran)氣(qi)體(ti)(ti)濃(nong)度有對應(ying)關系。