=k2△Pp Qm :蒸汽的質量流量 k：修正值 △ P：透過噴嘴節流元件前後的差壓 р:在一定溫度一定壓力下蒸汽的密度 1、由流量計所帶儀表（差壓變送器）測出透過節流元件的前後差壓 2、用壓力變送器測量出蒸汽管道內蒸汽的壓力，用熱電阻測量出管道內蒸汽的溫度 3、 機內編寫一PO的功能塊，其作用是對測量出的蒸汽流量進行密度補償。即在不同的壓力和不同的溫度下，選擇蒸汽在該溫度壓力下的密度，以計算出其質量流量。詳細取值情況如下（pi蒸汽壓力，ti蒸汽溫度，mp蒸汽的密度）： IF pi>=0.00 AND pi<=0.025 THEN IF ti<140 THEN mp:=0.52; ELSIF ti>=140 AND ti<=150 THEN mp:=0.52; ELSIF ti>150 AND ti<=170 THEN mp:=0.49; ELSIF ti>170 AND ti<=190 THEN mp:=0.47; ELSIF ti>190 AND ti<=210 THEN mp:=0.45; ELSIF ti>210 AND ti<=230 THEN mp:=0.43; ELSIF ti>230 AND ti<=250 THEN mp:=0.42; ELSIF ti>250 AND ti<=270 THEN mp:=0.40; ELSIF ti>270 AND ti<=290 THEN mp:=0.39;
ELSIF ti>290 AND ti<=310 THEN mp:=0.37; ELSIF ti>310 THEN mp:=0.36; END_IF ELSIF pi>0.025 AND pi<=0.10 THEN IF ti<140 THEN mp:=0.78; ELSIF ti>=140 AND ti<=150 THEN mp:=0.78; ELSIF ti>150 AND ti<=170 THEN mp:=0.74; ELSIF ti>170 AND ti<=190 THEN mp:=0.71; ELSIF ti>190 AND ti<=210 THEN mp:=0.68; ELSIF ti>210 AND ti<=230 THEN mp:=0.65; ELSIF ti>230 AND ti<=250 THEN mp:=0.62; ELSIF ti>250 AND ti<=270 THEN mp:=0.60; ELSIF ti>270 AND ti<=290 THEN mp:=0.58; ELSIF ti>290 AND ti<=310 THEN mp:=0.56; ELSIF ti>310 THEN mp:=0.54; END_IF ELSIF pi>0.10 AND pi<=0.20 THEN IF ti<140 THEN mp:=1.32; ELSIF ti>=140 AND ti<=150 THEN mp:=1.32; ELSIF ti>150 AND ti<=170 THEN mp:=1.25; ELSIF ti>170 AND ti<=190 THEN mp:=1.19; ELSIF ti>190 AND ti<=210 THEN mp:=1.14; ELSIF ti>210 AND ti<=230 THEN mp:=1.09; ELSIF ti>230 AND ti<=250 THEN mp:=1.04; ELSIF ti>250 AND ti<=270 THEN mp:=1.00; ELSIF ti>270 AND ti<=290 THEN mp:=0.97; ELSIF ti>290 AND ti<=310 THEN mp:=0.93; ELSIF ti>310 THEN mp:=0.90; END_IF ELSIF pi>0.20 AND pi<=0.28 THEN IF ti<140 THEN mp:=1.92; ELSIF ti>=140 AND ti<=150 THEN mp:=1.92; ELSIF ti>150 AND ti<=170 THEN mp:=1.82; ELSIF ti>170 AND ti<=190 THEN mp:=1.73; ELSIF ti>190 AND ti<=210 THEN mp:=1.65; ELSIF ti>210 AND ti<=230 THEN mp:=1.58; ELSIF ti>230 AND ti<=250 THEN mp:=1.51; ELSIF ti>250 AND ti<=270 THEN mp:=1.45; ELSIF ti>270 AND ti<=290 THEN mp:=1.40; ELSIF ti>290 AND ti<=310 THEN mp:=1.35; ELSIF ti>310 THEN mp:=1.30;
總蒸汽流量計算方法 我廠測量總蒸汽的流量計為噴嘴式流量計，它屬於差壓式的流量計的一種，根據該儀表的原理氣體的流量與透過節流元件的差壓的開方成正比（k值）.計算公式如下： Qm
=k2△Pp Qm :蒸汽的質量流量 k：修正值 △ P：透過噴嘴節流元件前後的差壓 р:在一定溫度一定壓力下蒸汽的密度 1、由流量計所帶儀表（差壓變送器）測出透過節流元件的前後差壓 2、用壓力變送器測量出蒸汽管道內蒸汽的壓力，用熱電阻測量出管道內蒸汽的溫度 3、 機內編寫一PO的功能塊，其作用是對測量出的蒸汽流量進行密度補償。即在不同的壓力和不同的溫度下，選擇蒸汽在該溫度壓力下的密度，以計算出其質量流量。詳細取值情況如下（pi蒸汽壓力，ti蒸汽溫度，mp蒸汽的密度）： IF pi>=0.00 AND pi<=0.025 THEN IF ti<140 THEN mp:=0.52; ELSIF ti>=140 AND ti<=150 THEN mp:=0.52; ELSIF ti>150 AND ti<=170 THEN mp:=0.49; ELSIF ti>170 AND ti<=190 THEN mp:=0.47; ELSIF ti>190 AND ti<=210 THEN mp:=0.45; ELSIF ti>210 AND ti<=230 THEN mp:=0.43; ELSIF ti>230 AND ti<=250 THEN mp:=0.42; ELSIF ti>250 AND ti<=270 THEN mp:=0.40; ELSIF ti>270 AND ti<=290 THEN mp:=0.39;
ELSIF ti>290 AND ti<=310 THEN mp:=0.37; ELSIF ti>310 THEN mp:=0.36; END_IF ELSIF pi>0.025 AND pi<=0.10 THEN IF ti<140 THEN mp:=0.78; ELSIF ti>=140 AND ti<=150 THEN mp:=0.78; ELSIF ti>150 AND ti<=170 THEN mp:=0.74; ELSIF ti>170 AND ti<=190 THEN mp:=0.71; ELSIF ti>190 AND ti<=210 THEN mp:=0.68; ELSIF ti>210 AND ti<=230 THEN mp:=0.65; ELSIF ti>230 AND ti<=250 THEN mp:=0.62; ELSIF ti>250 AND ti<=270 THEN mp:=0.60; ELSIF ti>270 AND ti<=290 THEN mp:=0.58; ELSIF ti>290 AND ti<=310 THEN mp:=0.56; ELSIF ti>310 THEN mp:=0.54; END_IF ELSIF pi>0.10 AND pi<=0.20 THEN IF ti<140 THEN mp:=1.32; ELSIF ti>=140 AND ti<=150 THEN mp:=1.32; ELSIF ti>150 AND ti<=170 THEN mp:=1.25; ELSIF ti>170 AND ti<=190 THEN mp:=1.19; ELSIF ti>190 AND ti<=210 THEN mp:=1.14; ELSIF ti>210 AND ti<=230 THEN mp:=1.09; ELSIF ti>230 AND ti<=250 THEN mp:=1.04; ELSIF ti>250 AND ti<=270 THEN mp:=1.00; ELSIF ti>270 AND ti<=290 THEN mp:=0.97; ELSIF ti>290 AND ti<=310 THEN mp:=0.93; ELSIF ti>310 THEN mp:=0.90; END_IF ELSIF pi>0.20 AND pi<=0.28 THEN IF ti<140 THEN mp:=1.92; ELSIF ti>=140 AND ti<=150 THEN mp:=1.92; ELSIF ti>150 AND ti<=170 THEN mp:=1.82; ELSIF ti>170 AND ti<=190 THEN mp:=1.73; ELSIF ti>190 AND ti<=210 THEN mp:=1.65; ELSIF ti>210 AND ti<=230 THEN mp:=1.58; ELSIF ti>230 AND ti<=250 THEN mp:=1.51; ELSIF ti>250 AND ti<=270 THEN mp:=1.45; ELSIF ti>270 AND ti<=290 THEN mp:=1.40; ELSIF ti>290 AND ti<=310 THEN mp:=1.35; ELSIF ti>310 THEN mp:=1.30;