Yokogawa orifice flow meter EJX910A
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Has anyone used the EJX910A-CN Yokogawa flow meter? When two orifice plate flow meters are installed on the same pipeline, if the differential pressure between them is 1 KPA, it results in a flow rate difference of 2000 cubic meters per hour. Is this a problem related to the design of the orifice plates? The flowmeter parameters can still be changed through the calculation sheet. . . . . . . . . . . There is another issue: the flow rate of the transmitter with a high differential pressure is actually lower than that of the flow meter with a low differential pressure (in liters per hour)
It’s probably because the design and manufacturing of the two orifice plates are different
The orifice plate is fine; is it the gauge that has a problem? Right?
This post was last edited by cqdfwy on 2019-2-3 11:22. Are the inner diameters of the orifice plates, the pipe diameter, and the flow coefficients of the two orifice plate flow meters identical? Two orifice plate flowmeters are connected in series in the same pipeline, and the operating pressures of their throttling elements are not identical; strictly speaking, this can affect the measurement results, so pressure compensation is advisable. Of course, the impact of inaccurate differential pressure transmitters also needs to be considered.
Is pressure compensation done on the DCS?
They are connected in series on the same pipeline, with the two orifice plates 3 meters apart
I’m just telling you the factors that cause differences in flow rate; as for whether pressure compensation is necessary and what method to use for such compensation, it depends on the specific circumstances, such as the type of medium being measured (gas, liquid, or steam?) ), precision requirements, and so on.
If the orifice plates are the same, check the transmitter parameter settings again!
By checking the calculation sheets, I guess due to the pressure reduction at the first orifice plate and the flow restriction caused by the second orifice plate, the actual value for the second one is closer; factors related to non-straight pipe sections are taken into account