超重(zhong)(zhong)(zhong)限(xian)制(zhi)器(qi)是由傳(chuan)感器(qi)、運算放大(da)器(qi)、控(kong)(kong)制(zhi)執行(xing)器(qi)和(he)載荷指(zhi)示計等部分組(zu)成，將顯示、控(kong)(kong)制(zhi)和(he)報警功能(neng)集于一身。當起重(zhong)(zhong)(zhong)機起吊(diao)(diao)物(wu)品時，傳(chuan)感器(qi)產生變(bian)形，把(ba)載荷重(zhong)(zhong)(zhong)量(liang)轉化為電(dian)信號。通過對吊(diao)(diao)車的(de)起升結構的(de)取(qu)(qu)力（重(zhong)(zhong)(zhong)量(liang)傳(chuan)感器(qi)）反饋到(dao)該儀表中進(jin)行(xing)采(cai)集，讀(du)取(qu)(qu)，判斷后顯示當前(qian)重(zhong)(zhong)(zhong)量(liang)并對其進(jin)行(xing)相應工況指(zhi)示，超過額定(ding)重(zhong)(zhong)(zhong)量(liang)后速度切斷吊(diao)(diao)車吊(diao)(diao)鉤起升回路(lu)，使吊(diao)(diao)車不能(neng)起吊(diao)(diao)重(zhong)(zhong)(zhong)物(wu)，從而達到(dao)保護吊(diao)(diao)車及操作人員安好的(de)目的(de)。

泛用(yong)于(yu)橋式(shi)類型起重機(ji)和升降機(ji)。有些臂(bei)架(jia)類型起重機(ji)（如(ru)塔式(shi)起重機(ji)、門(men)座起重機(ji)）。

該(gai)產品(pin)普(pu)遍適(shi)用于0-99T很多施工升(sheng)降(jiang)(jiang)機、龍門吊、電(dian)動(dong)(dong)葫(hu)蘆、卷(juan)揚(yang)機，塞入式傳感器(qi)測量(liang)的起重機械。升(sheng)降(jiang)(jiang)機載荷量(liang)達(da)到(dao)相應限(xian)制(zhi)重量(liang)時，限(xian)制(zhi)器(qi)聲光報警(jing)；控制(zhi)儀可以輸(shu)出(chu)兩組繼電(dian)器(qi)輸(shu)出(chu)觸(chu)點(dian)信號(hao)，分別實(shi)現靜(jing)態超(chao)載報警(jing)、動(dong)(dong)態報警(jing)。當重量(liang)達(da)到(dao)限(xian)制(zhi)重量(liang)時，輸(shu)出(chu)繼電(dian)器(qi)觸(chu)點(dian)信號(hao)，切(qie)斷電(dian)路，施工升(sheng)降(jiang)(jiang)機防墜器(qi)使升(sheng)降(jiang)(jiang)機不能啟動(dong)(dong)運行。