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# Differential pressure type orifice flow meter and the relationship between the differential pressure

by：Sincerity Group     2020-08-02

differential pressure type flow and the relationship between the differential pressure of orifice flowmeter, illustrated as follows: pressure transmitter measuring flow, the differential of 0 ~ 100 kpa, secondary table range of 0-200 t/h, differential pressure transmitter output current for 4 & ndash; 20 ma, test for flow of 50 t/h and 160 t/h when the corresponding differential pressure value and current value is how much?

1) According to the differential pressure flow formula:

F = K× △p△px /△p = ( Fmax/F） 2 ( Square) △px =△p ( Fmax/F） 2 = 100000 ( 50/200) 2 ( Square) = 6. 25 kpai = ( Fmax/F） × 16+4=8mA△px=100000( 160/200) 2 ( Square) =64KPaI=( 160/200) × 16 + 4 = 16. 8 mA

2) Flow rate and differential pressure is generally open to relationships,

the F * F = K * delta p, K = F× F/delta P = 200 * 200/100 = 400 kpa < / P> < P> when flow rate of 50 t/h: delta P1 F1 / K = 50 * * F1 = 50/400 = 6. 25 kpa for the output current ( 20mA- 4mA） × 6. 25/100 + 4 = 5 ma

flow for 160 t/h: delta P2 = F2 * F2 / K = 160 * 160/400 = 64 kpa for the output current ( 20mA- 4mA） × 64/100 + 4 = 14. 24马

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