恒溫恒濕稱重系統如何維護保養

1.檢(jian)查(cha)與稱(cheng)重傳(chuan)(chuan)感器(qi)相(xiang)連接的(de)電(dian)(dian)纜線插座是(shi)否有(you)(you)接觸不(bu)良現(xian)象(xiang);或者檢(jian)查(cha)稱(cheng)重傳(chuan)(chuan)感器(qi)電(dian)(dian)纜線本身(shen)是(shi)否有(you)(you)斷裂現(xian)象(xiang)，造成稱(cheng)重信(xin)號不(bu)能輸入到放(fang)大器(qi)中。 檢(jian)查(cha)稱(cheng)重傳(chuan)(chuan)感電(dian)(dian)橋的(de)各焊(han)點是(shi)否有(you)(you)虛焊(han)、開焊(han)現(xian)象(xiang)，造成稱(cheng)重傳(chuan)(chuan)感電(dian)(dian)橋不(bu)工作。

2.檢查稱(cheng)(cheng)重(zhong)(zhong)傳(chuan)感(gan)器(qi)(qi)本身，看上面(mian)是否有(you)異物(wu)或(huo)粘附臟物(wu)，阻(zu)礙(ai)了傳(chuan)感(gan)器(qi)(qi)產(chan)生(sheng)彈(dan)性(xing)形變(bian)，致使(shi)有(you)載荷(he)作用加在(zai)傳(chuan)感(gan)器(qi)(qi)上時，彈(dan)性(xing)體(ti)不(bu)(bu)(bu)能正常產(chan)生(sheng)彈(dan)性(xing)形變(bian)，使(shi)電(dian)阻(zu)應(ying)變(bian)片的(de)電(dian)阻(zu)不(bu)(bu)(bu)發生(sheng)變(bian)化(hua)，導致稱(cheng)(cheng)重(zhong)(zhong)傳(chuan)感(gan)電(dian)橋(qiao)(qiao)沒有(you)稱(cheng)(cheng)重(zhong)(zhong)信號輸出。無稱(cheng)(cheng)重(zhong)(zhong)載荷(he)作用在(zai)電(dian)子計價(jia)秤(cheng)上時，稱(cheng)(cheng)重(zhong)(zhong)的(de)顯示(shi)(shi)值(zhi)不(bu)(bu)(bu)為(wei)零(ling)(ling)，而且(qie)顯示(shi)(shi)的(de)數值(zhi)不(bu)(bu)(bu)穩定(ding)，數值(zhi)不(bu)(bu)(bu)停的(de)在(zai)變(bian)化(hua)。此故障俗稱(cheng)(cheng)顯示(shi)(shi)有(you)零(ling)(ling)漂、不(bu)(bu)(bu)歸零(ling)(ling)和跳(tiao)(tiao)字，產(chan)生(sheng)此故障的(de)原(yuan)因是： 稱(cheng)(cheng)重(zhong)(zhong)傳(chuan)感(gan)電(dian)橋(qiao)(qiao)的(de)某一橋(qiao)(qiao)臂有(you)虛接(jie)、開焊現(xian)象(xiang)，或(huo)者是某焊點有(you)“接(jie)地"現(xian)象(xiang);檢查電(dian)源電(dian)壓(ya)是否穩定(ding)，如(ru)果電(dian)源電(dian)壓(ya)的(de)穩定(ding)性(xing)不(bu)(bu)(bu)好，也容易跳(tiao)(tiao)字。

3.稱重示值(zhi)不(bu)準。造成此(ci)現象的(de)原因是：
彈(dan)(dan)(dan)性(xing)體(ti)(ti)曾被摔撞(zhuang)過，造成(cheng)彈(dan)(dan)(dan)性(xing)體(ti)(ti)內產生應力(li);或者(zhe)彈(dan)(dan)(dan)性(xing)體(ti)(ti)局部斷裂(lie)，致使稱(cheng)重載荷作用在彈(dan)(dan)(dan)性(xing)體(ti)(ti)上時，彈(dan)(dan)(dan)性(xing)體(ti)(ti)產生的應變不是線性(xing)的，導致數字不準;

4.供橋電壓過高，造成電阻應(ying)變(bian)片(pian)(pian)過熱，使應(ying)變(bian)片(pian)(pian)的(de)粘(zhan)膠(jiao)受損壞，或使應(ying)變(bian)片(pian)(pian)的(de)阻值(zhi)改變(bian)，導致(zhi)讀數不準(zhun);
環境因素的影響。電子計價秤曾(ceng)在高溫或潮濕的環境中使用，造成應(ying)(ying)變(bian)橋路與彈(dan)性體(ti)之間的絕緣電阻值(zhi)下降; 彈(dan)性體(ti)疲勞過度，使彈(dan)性體(ti)失去應(ying)(ying)有的應(ying)(ying)力變(bian)化范(fan)圍(wei)。

5.將恒定(ding)稱(cheng)重載荷加到電子計(ji)價秤上(shang)時，稱(cheng)重顯示值隨時間變化(hua)，并且載荷越大、變化(hua)越大。習慣上(shang)稱(cheng)這種現象為蠕變，產生蠕變的(de)原(yuan)因(yin)主(zhu)要是粘(zhan)貼(tie)層(ceng)的(de)因(yin)素。 粘(zhan)貼(tie)膠選用(yong)不當(dang)，或粘(zhan)貼(tie)膠老化(hua)變質; 應變片在粘(zhan)貼(tie)時環境潮(chao)濕(shi)，粘(zhan)貼(tie)層(ceng)過厚(hou)以及(ji)粘(zhan)貼(tie)層(ceng)固化(hua)不良。