燃氣蒸汽鍋爐是(shi)一(yi)種(zhong)能(neng)量轉(zhuan)換設備(bei)，向(xiang)鍋(guo)爐(lu)輸入的(de)(de)能(neng)量有燃料(liao)中的(de)(de)化學能(neng)、電(dian)能(neng)、高(gao)溫(wen)(wen)煙(yan)氣(qi)的(de)(de)熱(re)能(neng)等情(qing)勢，而(er)經過鍋(guo)爐(lu)轉(zhuan)換，向(xiang)外輸出(chu)存在一(yi)定熱(re)能(neng)的(de)(de)蒸汽、高(gao)溫(wen)(wen)水(shui)(shui)或有機熱(re)載體。   水(shui)(shui)位(wei)低(di)于(yu)保險(xian)水(shui)(shui)位(wei)線，或看不見水(shui)(shui)位(wei)，水(shui)(shui)位(wei)表玻璃管（板）上呈(cheng)白色。雙色水(shui)(shui)位(wei)計呈(cheng)全(quan)部氣(qi)相唆使(shi)色彩。高(gao)低(di)水(shui)(shui)位(wei)警報(bao)器產生低(di)水(shui)(shui)位(wei)警報(bao)信(xin)號。低(di)水(shui)(shui)位(wei)聯鎖裝置(zhi)，水(shui)(shui)位(wei)低(di)于(yu)劃(hua)定值應使(shi)送(song)風機、引(yin)風機、爐(lu)排減速(su)器電(dian)機結(jie)束運(yun)行。

還有過(guo)熱器汽溫(wen)急劇回(hui)升，高于畸形出(chu)口汽溫(wen)。鍋(guo)(guo)爐排煙(yan)溫(wen)度升高。給(gei)水(shui)流量(liang)小(xiao)于蒸(zheng)汽流量(liang)，如若因爐管(guan)或省煤器管(guan)決裂(lie)造成缺(que)水(shui)時(shi)，則呈現相反景象。缺(que)水(shui)重(zhong)(zhong)大時(shi)，可(ke)嗅到焦味(wei)。缺(que)水(shui)重(zhong)(zhong)大時(shi)，從爐門(men)(men)可(ke)見到燒紅(hong)的水(shui)冷壁管(guan)。缺(que)水(shui)重(zhong)(zhong)大時(shi)，爐管(guan)可(ke)能決裂(lie)，這時(shi)可(ke)聽(ting)到有爆破聲，蒸(zheng)汽跟煙(yan)氣將從爐門(men)(men)、看火門(men)(men)處噴(pen)出(chu)。通過(guo) ;叫水(shui) ；判為重(zhong)(zhong)大缺(que)水(shui)時(shi)，必須緊急停爐，嚴禁盲目向鍋(guo)(guo)爐給(gei)水(shui)。通過(guo) ;叫水(shui) ;判為略微缺(que)水(shui)時(shi)，應減少(shao)燃料，鼓風，引風，并緩慢給(gei)水(shui)。