變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)(transmitter)是把傳(chuan)感器(qi)(qi)(qi)(qi)的(de)(de)(de)輸(shu)出(chu)信(xin)號轉變(bian)(bian)(bian)為可被控(kong)制器(qi)(qi)(qi)(qi)識別的(de)(de)(de)信(xin)號(或將傳(chuan)感器(qi)(qi)(qi)(qi)輸(shu)入的(de)(de)(de)非(fei)電(dian)量(liang)轉換(huan)成(cheng)電(dian)信(xin)號同(tong)時放大以便供遠方測量(liang)和控(kong)制的(de)(de)(de)信(xin)號源(yuan))的(de)(de)(de)轉換(huan)器(qi)(qi)(qi)(qi)。傳(chuan)感器(qi)(qi)(qi)(qi)和變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)一同(tong)構成(cheng)自動控(kong)制的(de)(de)(de)監測信(xin)號源(yuan)。不同(tong)的(de)(de)(de)物理(li)量(liang)需要(yao)不同(tong)的(de)(de)(de)傳(chuan)感器(qi)(qi)(qi)(qi)和相應的(de)(de)(de)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)。變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)的(de)(de)(de)種類很(hen)多，用在工控(kong)儀(yi)表上(shang)面的(de)(de)(de)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)主要(yao)有溫度(du)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)、壓(ya)力變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)、流量(liang)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)、電(dian)流變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)、電(dian)壓(ya)變(bian)(bian)(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)等(deng)等(deng)。

常見故障

1、安(an)(an)裝時(shi)應(ying)使變(bian)(bian)送器(qi)的壓力敏感件(jian)軸向垂直于重力方(fang)向， 變(bian)(bian)送器(qi)（圖7）如果安(an)(an)裝條件(jian)限制，則應(ying)安(an)(an)裝固定后(hou)調(diao)整變(bian)(bian)送器(qi)零位到(dao)標準值。

2、殘存的壓力(li)釋放不(bu)出，因(yin)此傳感器零位又下不(bu)來。排除此原因(yin)的最佳方法是將傳感器卸下，直接察看零位是否正常(chang)，如果正常(chang)更換密封圈再試。

3、加壓變送器(qi)輸(shu)出不(bu)變化，再(zai)加壓變送器(qi)輸(shu)出突然變化，泄壓變送器(qi)零位回不(bu)去。 產生此現象(xiang)的原因極有可能是壓力傳(chuan)感器(qi)密封圈引起的。

4、是否符合供電(dian)要求；電(dian)源(yuan)與(yu)變送(song)(song)器及負載設備之間(jian)有無(wu)接(jie)(jie)線錯誤。如果變送(song)(song)器接(jie)(jie)線端子上無(wu)電(dian)壓(ya)或極(ji)性(xing)接(jie)(jie)反均可造成變送(song)(song)器無(wu)電(dian)壓(ya)信號輸出。

5、壓力傳(chuan)感(gan)器(qi)及(ji)變送(song)器(qi)的外殼一(yi)般需(xu)接地，信號電(dian)纜(lan)線不得與動力電(dian)纜(lan)混合鋪設，傳(chuan)感(gan)器(qi)及(ji)變送(song)器(qi)周圍應避免有強電(dian)磁干擾。傳(chuan)感(gan)器(qi)及(ji)變送(song)器(qi)在使用 變送(song)器(qi)（圖(tu)8）中(zhong)應按行業規定(ding)進行周期檢定(ding)。

6、用戶在選擇壓力傳感(gan)器(qi)及變送器(qi)時(shi)，應充分了(le)解壓力測量系統的(de)工況，根據(ju)需要(yao)合理選擇，使系統工作(zuo)在最佳狀態，并可降低(di)工程造價。 

7、通過(guo)隔離(li)片(pian)(pian)和元(yuan)件內的(de)填(tian)充(chong)液傳送到測(ce)量膜片(pian)(pian)兩側。測(ce)量膜片(pian)(pian)與(yu)兩側絕緣片(pian)(pian)上(shang)的(de)電極各組成一(yi)個電容器(qi)。

8、壓力(li)變送器要求每(mei)周檢(jian)查一(yi)(yi)次(ci)，每(mei)個月檢(jian)驗一(yi)(yi)次(ci)，主(zhu)要是清除儀器內(nei)的(de)(de)灰(hui)塵，對(dui)(dui)電(dian)(dian)器元(yuan)件(jian)認真檢(jian)查，對(dui)(dui)輸出的(de)(de)電(dian)(dian)流值要經常校(xiao)對(dui)(dui)，壓力(li)變送器內(nei)部是弱電(dian)(dian)，一(yi)(yi)定要同外(wai)界強(qiang)電(dian)(dian)隔開。