1．選(xuan)擇(ze)測(ce)量范圍(wei)

　　和測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)重量(liang)(liang)(liang)(liang)、溫度(du)(du)(du)一樣，濕(shi)(shi)(shi)度(du)(du)(du)傳感(gan)(gan)(gan)器(qi)(qi)選擇(ze)先要(yao)考慮測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)范(fan)(fan)圍(wei)(wei)。除(chu)了氣象、科研部門外，溫、濕(shi)(shi)(shi)度(du)(du)(du)測(ce)(ce)(ce)控的(de)不(bu)需要(yao)全濕(shi)(shi)(shi)程(0-100％RH)測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)。在(zai)(zai)當今的(de)信息時代，傳感(gan)(gan)(gan)器(qi)(qi)技與計算機、自動控制(zhi)技術(shu)緊密(mi)結合(he)著。測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)的(de)目的(de)在(zai)(zai)于控制(zhi)，測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)與控制(zhi)合(he)稱使(shi)用(yong)(yong)范(fan)(fan)圍(wei)(wei)。對于不(bu)需要(yao)做測(ce)(ce)(ce)控系統的(de)應(ying)用(yong)(yong)者來說(shuo)，直接選擇(ze)通用(yong)(yong)型濕(shi)(shi)(shi)度(du)(du)(du)儀就可(ke)以了。例(li)如應(ying)用(yong)(yong)領(ling)域對濕(shi)(shi)(shi)度(du)(du)(du)傳感(gan)(gan)(gan)器(qi)(qi)使(shi)用(yong)(yong)溫度(du)(du)(du)、濕(shi)(shi)(shi)度(du)(du)(du)的(de)要(yao)求(qiu)(qiu)也(ye)各不(bu)相同，供使(shi)用(yong)(yong)者參考。用(yong)(yong)戶根(gen)據需要(yao)向傳感(gan)(gan)(gan)器(qi)(qi)生(sheng)(sheng)產廠(chang)提出測(ce)(ce)(ce)量(liang)(liang)(liang)(liang)范(fan)(fan)圍(wei)(wei)，生(sheng)(sheng)產廠(chang)優先保用(yong)(yong)戶在(zai)(zai)使(shi)用(yong)(yong)范(fan)(fan)圍(wei)(wei)內傳感(gan)(gan)(gan)器(qi)(qi)的(de)性(xing)能穩定，求(qiu)(qiu)得合(he)理的(de)性(xing)能比，對雙方來講是一件相得益(yi)彰的(de)事情。

　　2、選擇(ze)測量精度

　　和測(ce)量范圍一(yi)樣(yang)，測(ce)量精(jing)度(du)(du)(du)同是(shi)(shi)傳感器(qi)重要(yao)(yao)的指標(biao)(biao)。每高—個百(bai)(bai)分點(dian)．對傳感器(qi)來說就(jiu)是(shi)(shi)上一(yi)個臺(tai)階，是(shi)(shi)上一(yi)個檔次。因為要(yao)(yao)達到(dao)不同的精(jing)度(du)(du)(du)，其制造成本相差(cha)很大，售價也相差(cha)遠。例如(ru)1只(zhi)廉價的濕(shi)度(du)(du)(du)傳感器(qi)只(zhi)有幾美元，而1只(zhi)供標(biao)(biao)定用(yong)的全(quan)濕(shi)程濕(shi)度(du)(du)(du)傳感器(qi)要(yao)(yao)幾百(bai)(bai)美元，相差(cha)。所以使(shi)用(yong)者要(yao)(yao)量體裁衣，不宜盲目追(zhui)求“高、精(jing)、尖”。

　　生(sheng)產廠商往往是(shi)分段(duan)給(gei)出(chu)其濕(shi)(shi)度(du)(du)傳(chuan)(chuan)感(gan)器的(de)(de)(de)精(jing)度(du)(du)的(de)(de)(de)。如(ru)(ru)(ru)中、低溫(wen)(wen)(wen)段(duan)(0一(yi)80％RH)為±2％RH，而(er)高濕(shi)(shi)段(duan)(80—100％RH)為±4％RH。而(er)且此精(jing)度(du)(du)是(shi)在(zai)某溫(wen)(wen)(wen)度(du)(du)下(xia)(如(ru)(ru)(ru)25℃)的(de)(de)(de)值。如(ru)(ru)(ru)在(zai)不(bu)同溫(wen)(wen)(wen)度(du)(du)下(xia)使(shi)用濕(shi)(shi)度(du)(du)傳(chuan)(chuan)感(gan)器．其示(shi)值還(huan)要考慮溫(wen)(wen)(wen)度(du)(du)漂移的(de)(de)(de)影響。相(xiang)對濕(shi)(shi)度(du)(du)是(shi)溫(wen)(wen)(wen)度(du)(du)的(de)(de)(de)函數，溫(wen)(wen)(wen)度(du)(du)嚴重地影響著空間內的(de)(de)(de)相(xiang)對濕(shi)(shi)度(du)(du)。溫(wen)(wen)(wen)度(du)(du)每變化(hua)0.1℃。將(jiang)產生(sheng)0.5％RH的(de)(de)(de)濕(shi)(shi)度(du)(du)變化(hua)(誤差)。使(shi)用場合如(ru)(ru)(ru)果難做到恒溫(wen)(wen)(wen)，則提出(chu)過高的(de)(de)(de)測濕(shi)(shi)精(jing)度(du)(du)是(shi)不(bu)好的(de)(de)(de)。因為濕(shi)(shi)度(du)(du)隨著溫(wen)(wen)(wen)度(du)(du)的(de)(de)(de)變化(hua)也漂忽不(bu)定的(de)(de)(de)話(hua)，奢談測濕(shi)(shi)精(jing)度(du)(du)將(jiang)失去實(shi)際(ji)意義。所(suo)以控(kong)濕(shi)(shi)先要控(kong)好溫(wen)(wen)(wen)，這(zhe)就是(shi)大量應用的(de)(de)(de)往往是(shi)溫(wen)(wen)(wen)濕(shi)(shi)度(du)(du)—體化(hua)傳(chuan)(chuan)感(gan)器而(er)不(bu)單純是(shi)濕(shi)(shi)度(du)(du)傳(chuan)(chuan)感(gan)器的(de)(de)(de)緣故。

　　大(da)多數情況(kuang)下，如果(guo)沒有(you)控溫(wen)手段，或者(zhe)被測空間是非(fei)密封的，±5％RH的精(jing)度(du)就夠了。對于要求(qiu)控制恒(heng)溫(wen)、恒(heng)濕(shi)的局部空間，或者(zhe)需要記錄濕(shi)度(du)變(bian)化(hua)的場(chang)合(he)，再選用±3％RH。以(yi)上精(jing)度(du)的濕(shi)度(du)傳(chuan)感(gan)器(qi)。與(yu)此相對應的溫(wen)度(du)傳(chuan)感(gan)器(qi)．其測溫(wen)精(jing)度(du)須(xu)足±0.3℃以(yi)上，起碼是±0.5℃的。而精(jing)度(du)高于±2％RH的要求(qiu)恐(kong)怕(pa)連(lian)校準(zhun)傳(chuan)感(gan)器(qi)的標準(zhun)濕(shi)度(du)發(fa)生器(qi)也難做到，何況(kuang)傳(chuan)感(gan)器(qi)自(zi)身了。國家標準(zhun)物質(zhi)濕(shi)度(du)室的文章認為：“相對濕(shi)度(du)測量儀(yi)表，即使在20—25℃下，要達到2％RH的準(zhun)確度(du)仍是很困(kun)難的。”

　　3、考慮時(shi)漂和溫(wen)漂

　　傳感(gan)器(qi)都存在(zai)時漂和溫漂。由于濕(shi)度傳感(gan)器(qi)中的(de)(de)水汽相(xiang)接觸，所以不能密封。這(zhe)就(jiu)決定(ding)(ding)(ding)了它的(de)(de)穩定(ding)(ding)(ding)性和壽命(ming)是有(you)限(xian)的(de)(de)。一般(ban)情(qing)況下，生產廠商會標(biao)(biao)明1次標(biao)(biao)定(ding)(ding)(ding)的(de)(de)使用(yong)時間為1年或2年，到期(qi)負責重新(xin)(xin)標(biao)(biao)定(ding)(ding)(ding)。請(qing)使用(yong)者(zhe)在(zai)選擇傳感(gan)器(qi)時考慮好日后重新(xin)(xin)標(biao)(biao)定(ding)(ding)(ding)的(de)(de)渠道，不要貪(tan)圖便宜或迷(mi)信洋(yang)貨而忽略了售后服(fu)務問屬。

　　選擇(ze)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)傳(chuan)(chuan)感(gan)器要(yao)考慮應用(yong)(yong)(yong)場(chang)合的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)(du)(du)變化范(fan)圍，看(kan)所選傳(chuan)(chuan)感(gan)器在溫(wen)(wen)度(du)(du)(du)(du)(du)下能否正常工(gong)作(zuo)，溫(wen)(wen)漂是(shi)(shi)否出設(she)計指標。要(yao)提醒使(shi)用(yong)(yong)(yong)者注意的(de)(de)(de)(de)是(shi)(shi)：電(dian)(dian)(dian)容式濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)傳(chuan)(chuan)感(gan)器的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)(du)(du)系(xi)數α是(shi)(shi)個變量，它隨使(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)(du)(du)(du)(du)、濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)范(fan)圍而異(yi)。這是(shi)(shi)因為水(shui)和高(gao)(gao)分子聚合物的(de)(de)(de)(de)介電(dian)(dian)(dian)系(xi)數隨溫(wen)(wen)度(du)(du)(du)(du)(du)的(de)(de)(de)(de)改(gai)變是(shi)(shi)不同步的(de)(de)(de)(de)，而溫(wen)(wen)度(du)(du)(du)(du)(du)系(xi)數α又主要(yao)取(qu)決于水(shui)和感(gan)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)材(cai)料的(de)(de)(de)(de)介電(dian)(dian)(dian)系(xi)數，所以(yi)電(dian)(dian)(dian)容式濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)敏元(yuan)件的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)(du)(du)系(xi)數。電(dian)(dian)(dian)容式濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)傳(chuan)(chuan)感(gan)器在常溫(wen)(wen)、中濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)段(duan)的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)(du)(du)系(xi)數小(xiao)，5-25℃時(shi)，中低濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)段(duan)的(de)(de)(de)(de)溫(wen)(wen)漂可忽(hu)略不計。但在高(gao)(gao)溫(wen)(wen)高(gao)(gao)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)區(qu)(qu)或負溫(wen)(wen)高(gao)(gao)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)區(qu)(qu)使(shi)用(yong)(yong)(yong)時(shi)，就(jiu)要(yao)考慮溫(wen)(wen)漂的(de)(de)(de)(de)影響，進行的(de)(de)(de)(de)補(bu)償或訂正。隨著時(shi)代(dai)的(de)(de)(de)(de)發展(zhan)，科研、農業(ye)(ye)、暖(nuan)通(tong)、紡織、機房、電(dian)(dian)(dian)力等工(gong)業(ye)(ye)部門(men)，越來越需要(yao)采(cai)用(yong)(yong)(yong)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)傳(chuan)(chuan)感(gan)器，對產品(pin)質量的(de)(de)(de)(de)要(yao)求越業(ye)(ye)越高(gao)(gao)，對環境溫(wen)(wen)、濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)的(de)(de)(de)(de)控(kong)制(zhi)以(yi)及對工(gong)業(ye)(ye)材(cai)料水(shui)份值的(de)(de)(de)(de)監(jian)測與分析都已成為比較普(pu)遍的(de)(de)(de)(de)技術(shu)條件之一。濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)傳(chuan)(chuan)感(gan)器產品(pin)屬于90年代(dai)興起的(de)(de)(de)(de)行業(ye)(ye)。如何使(shi)用(yong)(yong)(yong)好濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)傳(chuan)(chuan)感(gan)器，如何判斷(duan)濕(shi)(shi)(shi)(shi)(shi)(shi)(shi)度(du)(du)(du)(du)(du)傳(chuan)(chuan)感(gan)器的(de)(de)(de)(de)性能，這對一般用(yong)(yong)(yong)戶來講，仍(reng)然是(shi)(shi)一件較為復雜的(de)(de)(de)(de)技術(shu)問題。