描述
SF6高壓電器要求SF6的濕度相當(dāng)?shù)?。一般的傳感器難于達(dá)到測(cè)量低濕的要求。對(duì)于低濕測(cè)量(在30%以下)使用電容式濕度傳感器為宜。
濕敏電容是由高分子材料作為基底,在其上下表面蒸鍍一薄層微孔電極,構(gòu)成一個(gè)平行板電容器;當(dāng)氣體的相對(duì)濕度發(fā)生變化時(shí)高分子材料的介電常數(shù)隨著改變,導(dǎo)致濕敏電容的容量發(fā)生變化,從而實(shí)現(xiàn)相對(duì)濕度△x%RH。
Humirel公司的電容式濕度傳感器,工作范同寬(1%~99%RH),線性度好,響應(yīng)時(shí)間短(典型值10s),可以工作于-40~100℃,具有較高的可靠性和長(zhǎng)期的穩(wěn)定性,其典型的標(biāo)稱電容值為180PF(55%RH),推薦溫度系數(shù)為0.04PF/℃。高分子薄膜電容式濕度傳感器的敏感量為相對(duì)濕度。
在設(shè)計(jì)中,為將濕敏電容容量的變化轉(zhuǎn)化為電信號(hào),采用了一片555定時(shí)器。555定時(shí)器電路是一種雙極型集成電路,由于它的結(jié)構(gòu)獨(dú)特,只要在外部引腳配上適當(dāng)?shù)淖枞菰憧蓸?gòu)成脈沖產(chǎn)生與變換電路,因此被應(yīng)用廣泛。
產(chǎn)品廣泛應(yīng)用于:電力、石油、礦井提升、港口、供熱、燃?xì)狻⒐┧?、污水處理、冶金、造紙、紡織、化工、水利等現(xiàn)代化工業(yè)領(lǐng)域!
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主營(yíng):世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國(guó)AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國(guó)西屋)系列產(chǎn)品》
⑤SIEMENS(西門(mén)子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門(mén)子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂(lè)):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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