電接點壓力表由測量系統、指示裝置、電接裝置或磁助電接點裝置、外殼、調整裝置和接線盒等組成。
    電接點壓力表的工作原理是基于(yu)測量系統(tong)(tong)中的彈簧(huang)管在被(bei)測介質的壓力作用下(xia)，迫使(shi)彈簧(huang)管末(mo)端產(chan)生相(xiang)應的彈性變形——位移，借助拉桿經齒輪傳動(dong)(dong)機構(gou)的傳動(dong)(dong)并予放大，由固(gu)定于(yu)齒輪軸(zhou)上(shang)(shang)的指示(shi)指針（連同(tong)觸頭）逐將被(bei)測值在度(du)盤(pan)上(shang)(shang)指示(shi)出來。與此(ci)同(tong)時，當其與設定指針上(shang)(shang)的觸頭（上(shang)(shang)限(xian)(xian)或下(xia)限(xian)(xian)）相(xiang)接觸（動(dong)(dong)斷或動(dong)(dong)合）的瞬時，控(kong)制系統(tong)(tong)的電路得以(yi)斷開或接通，以(yi)達到自(zi)動(dong)(dong)控(kong)制和發(fa)信的目的。