E+H流量计,超声波流量计 E+H超声波流量计 E+H超声波流量计的主要特点是:流体中不插入任何元件,对流速无影响,也没有压力损失;能用于任何液体,特别是具有高黏度、强腐蚀,非导电性等性能的液体的流量测量,也能测量气体的流量;对于大口径管道的流量测量,不会因管径大而增加投资;量程比较宽,可达5:1;输出与流量之间呈线性等优点。缺点:当被测液体中含有气泡或有杂音时,将会影响测量精度,故要求变送器前后分别有10D和5D的直管段;此外,结构复杂,成本较高。 超声波流量计测量原理:当超声波束在液体中传播时,液体的流动将使传播时间产生微小变化,并且其传播时间的变化正比于液体的流速,其关系符合下列表达式 其中 θ为声束与液体流动方向的夹角 M 为声束在液体的直线传播次数 D 为管道内径 Tup 为声束在正方向上的传播时间 Tdown为声束在逆方向上的传播时间 ΔT=Tup –Tdown 设静止流体中的声速为c,流体流动的速度为u,传播距离为L,当声波与流体流动方向*时(即顺流方向),其传播速度为c+u;反之,传播速度为c-u.在相距为L的两处分别放置两组超声波发生器和接收器(T1,R1)和(T2,R2)。当T1顺方向,T2逆方向发射超声波时,超声波分别到达接收器R1和R2所需要的时间为t1和t2,则 t1=L/(c+u) t2=L/(c-u) 由于在工业管道中,流体的流速比声速小的多,即c>>u,因此两者的时间差为 ▽t=t2-t1=2Lu/cc 由此可知,当声波在流体中的传播速度c已知时,只要测出时间差▽t即可求出流速u,进而可求出流量Q。利用这个原理进行流量测量的方法称为时差法。此外还可用相差法、频差法等。 E+H流量计,超声波流量计 E+H超声波流量计 E+H FTM50-AGK2K2A32AA E+H FTE30-FAB1 E+H FTE30-JAB1 E+H FTM50-AGK2K2A32AA E+H FTL50-ATE2AA1G5A E+H FTL20H-0UPJ2D E+H FTL20H-0MNJ2F E+H FMR533-AACWJAC2RA E+H FTL20-3225 E+H DB50L-AC50BC13GE30 E+H FTL51-AGR2BB4G5A L=200MM E+H FMI51-A1BTDJB3A1A E+H FTL325P-F1A1 E+H FTM50-6AG2K4A52AA L=160MM E+H FTL20H-0GDJ1B E+H FMX167-E3DBC2A7 L=4M E+H FMX167-E3DBB2A7 L=2M E+H FTM50-AB32A4A32AA E+H FMP40-4BB2GNJH21AA L=1440 E+H FTL20-0020 E+H FXA195-G1 52027505 E+H FTM51-4AG2L4A12AA E+H FTL50-AGQ2AA4G5A E+H FMR250-A5E1GNJAA4M E+H FTL260-0120 E+H FTM30-A4AA1, L=230mm E+H FMR240-A2V1CQJBA2A E+H FMR240-A5V1GGJAA4A E+H FTM260-G4B E+H FTC260-AA4B1 E+H FMR250-A5E1XCJAA3K E+H FTM30-A4DB1 E+H FTL51-AGR2DB4G5A L=118MM E+H FTM50-AGJ2A4A52AA E+H FTM21-AG345A E+H FTL50-AGN2AA2G4A E+H FMP40-7AA2GRJB11HA L=4150MM E+H FTL20-002D E+H FTC260-AA4D1 E+H FTW325-A2A1A E+H FMR230-44ECQJAC2A E+H FTC262-AA14D1, L=1000MM E+H FTL361-RGR2AA1R, L=500MM E+H FMP40-AAA2CRJB21AA L=4M E+H DC11TEN-AA11D1BK41,L=1600MM E+H DB101-G1TE205Z 缆长为6M E+H DB50-AC20BB12EG10 E+H FTW325-C2A1A E+H RN221N-A1 E+H FTI51-2AA1GEJ45A1A L=200MM E+H FTL50H-ATE2AC2G6A E+H FTM31-A4DA1A, L=600mm E+H FTM51-AGG2L2A72AAL=2000MM E+H FTL51-DGR2DB4G5A E+H FTM52-AGG2B4A32AA L=3M E+H FTM52-AGG2B4A32AA L=6M E+H 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DB53-AK71BC23EG20 L=5000MM E+H DB53-AK71BC23EG20 L=6000MM E+H FMI51-A1AGCJA2A1A L=2500mm E+H DB50-AC21BA33GG20 E+H PMP46-GE13P1R1PBL E+H FMR230-A6VC6JBA2A E+H FMR240-A5E1CWJAA2 E+H FMR240-A5E1CQJAA2A E+H DB51-AE10BB13CG30 L=2.9M E+H FTL51-AGN2DB2G5A E+H FTL50-AGR2AA4F5A E+H FTM51-AGG2L4A32AA L=800MM E+H FTL51-AGR2BB2G5A L=148MM E+H FTM50-AGJ2A4A37AA E+H FTL330H-RGA20 E+H FMI51-A1BGEJB3A1A L=800MM E+H FMI51-A1BGEJB3A1A L=1300MM E+H FMI51-A1BGEJB3A1A L=2600MM E+H FTL51-AGQ2BB4F4A L=1000MM E+H FTL260-1020 E+H FMI51-A1BMRJB5A1A L=260MM E+H FTL375P-H1E1 E+H FMI21-A1A1B1, L=900mm E+H TMR35-A1BADBAA1AAA E+H FTL20H-0MQJ2B E+H DB53-AK71BC12GG20 L=8000MM E+H FTL51-ATC2DB2G5A E+H FTL50H-AMA2AC2G4A E+H FTM51-AGX2M4A52AA L=300MM E+H FTL51-FGQ2BB6G4A L=800MM E+H FTL325N-M1E1 E+H FMP40-AHE3CMJB21AA L=8M E+H FTM50-AGG2A4A52AA E+H FMR250-A5E2GNJAA2K
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