氨氣分(fen)析儀(yi)的(de)(de)檢測(ce)(ce)原(yuan)理一般包括(kuo)電(dian)化學或(huo)半(ban)導體(ti)原(yuan)理傳(chuan)(chuan)感器。采(cai)樣方(fang)式(shi)(shi)分(fen)為泵(beng)吸式(shi)(shi)和擴散式(shi)(shi)，氨氣檢測(ce)(ce)儀(yi)主要有(you)采(cai)樣、檢測(ce)(ce)、指(zhi)示(shi)及報警等部分(fen)組成，當環境中的(de)(de)氨氣擴散或(huo)抽吸達到傳(chuan)(chuan)感器時，傳(chuan)(chuan)感器將氨氣濃度大小(xiao)轉換(huan)為一定大小(xiao)的(de)(de)電(dian)信號，再由顯(xian)示(shi)器將濃度值顯(xian)示(shi)出(chu)來。下(xia)面是對氨氣檢測(ce)(ce)儀(yi)工作(zuo)原(yuan)理的(de)(de)介紹:

空(kong)氣和被測(ce)氣體(ti)通(tong)過擴散膜擴散到感(gan)(gan)應(ying)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)上。控(kong)制電(dian)(dian)(dian)(dian)(dian)路在(zai)感(gan)(gan)應(ying)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)和對(dui)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)之間(jian)維持一(yi)個足以(yi)開始(shi)電(dian)(dian)(dian)(dian)(dian)化學反應(ying)的(de)(de)電(dian)(dian)(dian)(dian)(dian)壓。在(zai)被測(ce)氣體(ti)的(de)(de)作用(yong)下產生的(de)(de)電(dian)(dian)(dian)(dian)(dian)化反應(ying)在(zai)兩(liang)極(ji)(ji)之間(jian)形(xing)成電(dian)(dian)(dian)(dian)(dian)流。這一(yi)電(dian)(dian)(dian)(dian)(dian)流的(de)(de)強度與被測(ce)氣體(ti)的(de)(de)濃(nong)度成比例(li)，并且是可逆的(de)(de)。控(kong)制電(dian)(dian)(dian)(dian)(dian)路還在(zai)感(gan)(gan)應(ying)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)和參考電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)之間(jian)形(xing)成偏置電(dian)(dian)(dian)(dian)(dian)平(ping)，這種電(dian)(dian)(dian)(dian)(dian)平(ping)在(zai)兩(liang)極(ji)(ji)之間(jian)不形(xing)成電(dian)(dian)(dian)(dian)(dian)流。傳感(gan)(gan)器的(de)(de)快速反應(ying)使(shi)它(ta)能夠對(dui)周圍空(kong)氣進行實(shi)時、連續的(de)(de)檢測(ce)。

如何安裝：

1、氨氣比空氣輕，氨氣檢測探頭安裝高度宜高出釋放源0.5～2m。

2、檢測探(tan)頭宜安裝(zhuang)在(zai)無沖(chong)擊、無振(zhen)動、無強(qiang)電(dian)磁場(chang)干(gan)擾的(de)場(chang)所，且周圍留(liu)有不小(xiao)于0.3m的(de)凈空。

3、檢(jian)測探頭(tou)的安(an)裝(zhuang)與接線(xian)須按規定(ding)要(yao)求進行，且應符合防爆儀表安(an)裝(zhuang)接線(xian)的有關規定(ding)。