該流量計(jì)在LT－LC型的基礎(chǔ)上采用可回零計(jì)數(shù)器。該計(jì)數(shù)器設(shè)有回零、累計(jì)兩組字輪，具有批量計(jì)數(shù)和總量積算之雙重功能，其特點(diǎn)為當(dāng)用戶所實(shí)施的是間斷計(jì)量，并要分別得到計(jì)算結(jié)果，則可預(yù)先設(shè)置儀表指針及回零字輪組，顯示為零即可給出每一次計(jì)量值，可反復(fù)循環(huán)使用，而總量積算將不斷累計(jì)。
使用時(shí)，順時(shí)針旋轉(zhuǎn)字輪回零手柄，可把回零計(jì)數(shù)器數(shù)字組回到零位；撳下指針回零手柄，順時(shí)針旋轉(zhuǎn)，可把指針回到零位。使用回零計(jì)數(shù)器時(shí)不影響累、積計(jì)數(shù)器計(jì)量。
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