Yokogawa’s steam vortex flow meter requires the density value to be changed whenever there is a change in pressure
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This post was last edited by liu530014416 on 2023-1-27 at 20:42. Dear teachers, the steam flow meter used in the boiler on this unit is from Yokogawa Electric; it measures the mass flow rate of the steam. Since the pressure control value changes depending on the load, for example, when the pressure is set at 1.6 Mpa, the density inside the flow meter is adjusted to 1.6 Mpa using the handheld controller, and when the pressure is set at 1.4 Mpa, the density inside the flow meter is adjusted to 1.4 Mpa. My question is: can’t Yokogawa’s flow meters automatically adjust their measurement values according to changes in pressure? I’ve seen that some domestic flowmeters are equipped with a condenser; I haven’t seen one on Yokogawa vortex flowmeters Also, the display of this Yokogawa vortex flowmeter is showing an err-40 error, but the measurements are accurate. How can this err-40 issue be resolved?
Based on your description, it seems to be a Yokogawa vortex flow meter that uses local fixed-value pressure compensation. If dynamic compensation is required, a pressure transmitter signal is needed, and this can be implemented in a DCS or a flow calculation instrument. I have used domestic flow meters with compensation functions, but their stability is poor and they tend to break easily.
Is the pressure transmitter signal connected directly to the flow meter? I see that Yokogawa’s manual supports analog input
Temperature and pressure signals can be fed into the DCS, where dynamic compensation for temperature and pressure can be configured.
If input is supported, it should work. I don’t have this model of flow meter; if the manual can be sent, we can all study it together*
This post was last edited by qugd on 2023-2-12 at 10:17. The DY series digital vortex flowmeters from Yokogawa Electric, when the /MV option is selected – which enables multi-parameter measurement – allow for the inclusion of a temperature sensing element within the vortex generator, enabling direct measurement of the temperature of saturated steam and thus automatic compensation for steam density. When selecting the model, it is necessary to include this option for multi-parameter measurement; it should also be specified when outlining the process conditions, and the selection calculation should be carried out using Yokogawa’s dedicated software. However, it is not applicable to superheated steam.
A vortex flow meter without temperature and pressure compensation is of this kind; it is generally used in situations where temperature and pressure remain constant. If dynamic compensation is required, temperature and pressure data must be fed into a DCS, an integrator, or a gauge equipped with its own calculation module to carry out the compensation calculations.
Vapor measurement must take into account both temperature and pressure; by using these values, it is possible to determine the state of the vapor. If it happens to be a mixture of water and vapor, then no gauge will give accurate readings. It is recommended to feed the temperature and pressure signals into a DCS system – there’s no need to rely on gauges for this purpose. If I were in charge, that’s what I would do
Yokogawa’s vortex flowmeter measures volumetric flow rate, and density compensation is required; this issue can be resolved by installing temperature and pressure sensors on the flow totalizer.