=8.04;Р ELSIF ti>250 AND ti<=270 THEN mp:=7.64;Р ELSIF ti>270 AND ti<=290 THEN mp:=7.29;Р ELSIF ti>290 AND ti<=310 THEN mp:=6.99;Р ELSIF ti>310 THEN mp:=6.71;Р END_IFРELSIF pi>1.750 AND pi<=1.850 THENР IF ti<210 THEN mp:=9.04;Р ELSIF ti>=210 AND ti<=230 THEN mp:=9.04;Р ELSIF ti>230 AND ti<=250 THEN mp:=8.53;Р ELSIF ti>250 AND ti<=270 THEN mp:=8.10;Р ELSIF ti>270 AND ti<=290 THEN mp:=7.72;Р ELSIF ti>290 AND ti<=310 THEN mp:=7.40;Р ELSIF ti>310 THEN mp:=7.10;Р END_IFРELSIF pi>1.850 THENР IF ti<210 THEN mp:=9.58;Р ELSIF ti>=210 AND ti<=230 THEN mp:=9.58;Р ELSIF ti>230 AND ti<=250 THEN mp:=9.03;Р ELSIF ti>250 AND ti<=270 THEN mp:=8.56;Р ELSIF ti>270 AND ti<=290 THEN mp:=8.16;Р ELSIF ti>290 AND ti<=310 THEN mp:=7.81;Р ELSIF ti>310 THEN mp:=7.49;Р END_IFРk值与探头的阻断系数、流体的膨胀系数、管道的内径均有关系,所以k值的大小各不一致。
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