靶式流量计产品分解.pptVIP

Welkin International Holdings Corp.;公司介绍;Welkin Strain Gage Target Meter. 纬尔科恩应变片式靶式流量计;Strain Gage Target Meter Introduction;Industries and Applications ;Industries and Applications ;Design Makes it Special 独具匠心的设计;About Welkin;Force from the fluid flow is transferred from the target to the sensing tube (流体的作用力经靶板传递到传感部分） Four strain gages (variable resisters) attached to the sensing tube [two on forward side of flow two on reverse side of flow] are connected in a four-active arm bridge circuit ( 四个电阻应变片组成惠斯通电桥的4个臂） At zero flow the strain gages are equal, the bridge circuit is balanced producing zero output (没有流量时，电桥保持平衡，产生零点输出）;Flow produces strain on the sensing tube causing the strain gages to change resistance unbalancing the bridge circuit producing an output proportional to flow squared (有流量时，应变片电阻产生变化，电桥平衡被打破，产生和流速平方根成正比的信号输出）;Flow = ( F )1/2 x fsFlow fsF where: F = force（受力） fsF = full scale force (2.0 mV / V of excitation) （满量程受力） fsFlow = full scale flow (GPM, ACFM, PPH) （满量程）; Mathematically stated as: F = Cd x A x p x V2 2g where, F = force（受力） Cd = drag coefficient (target shape)（阻尼系数） A = target area（靶板面积） p = fluid density（流体密度） V2 = velocity head（特征流速） 2g ;No frictional moving parts (无摩擦可动件） No gears, bearings, or rotors (无齿轮，轴承，转子） Fast response time (相应时间快） Two milliseconds for a 90% step function (90%的功能2mS完成) Versatile (多用途） Liquids, gases, steam, cryogenics (液体、气体、蒸汽、低温介质） One meter for many applications (less training required for customers) (仪表多用) Durable, rugged (耐用，皮实) All welded construction of sensing elements (全焊接结构) ;True 15:1 turndown on liquids and gases (液体、气体工况下真正的15:1量程比);Accuracy (精度);Dependable (可靠);The Ideal Steam Flowmeter (理想的蒸汽流量计);Field Proven Performance 实际应用举例;In October 1984,NASA included two strain gage target meters in the s