何謂壓力開關(guān)的死區(qū)
一、壓力開關(guān)的死區(qū)概念
壓力開關(guān)的死區(qū)是指在運(yùn)行過(guò)程中，不可以進(jìn)行測(cè)量的區(qū)域，也可稱為回差和不靈敏區(qū)。當(dāng)設(shè)備壓力達(dá)到設(shè)定值時(shí)，壓力開關(guān)會(huì)正常的發(fā)生動(dòng)作，而當(dāng)系統(tǒng)設(shè)備隨反方向變化時(shí)，開關(guān)不是一到達(dá)設(shè)定點(diǎn)就發(fā)生動(dòng)作，而是要經(jīng)過(guò)某個(gè)區(qū)域后才發(fā)生動(dòng)作。
二、舉例介紹
當(dāng)壓力設(shè)定值為100mbar，一旦設(shè)備的壓力達(dá)到此點(diǎn)時(shí)，壓力開關(guān)便會(huì)發(fā)生動(dòng)作，而當(dāng)從90mbar降到100mbar時(shí)，壓力開關(guān)就不會(huì)立即復(fù)位，而是要經(jīng)過(guò)一個(gè)區(qū)域才會(huì)復(fù)位，它所經(jīng)過(guò)的區(qū)域就是死區(qū)。
三、原因分析
之所以壓力開關(guān)會(huì)發(fā)生死區(qū)是因?yàn)閴毫﹂_關(guān)內(nèi)部元件之間產(chǎn)生了抵觸，導(dǎo)致了壓力開關(guān)的誤動(dòng)，所以，如果想要避免死區(qū)，壓力開關(guān)的參數(shù)在最初設(shè)置時(shí)就要設(shè)置正確。
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