Vortex flow meter

It’s not necessary, as the built-in temperature allows for the direct calculation of mass flow rate; it can be connected directly to the integrator.

Is it superheated steam or saturated steam? If it’s saturated, then it’s not necessary

The density of saturated steam is highly dependent on the pressure and temperature of the steam; for the same volume of steam, the mass varies significantly depending on the pressure. For example, when the saturated steam pressure is P=6 kg, the density is ρ=3.111 kg/m3; when P=7 kg, the density is ρ=3.6 kg/m3. For the same volume, the mass differs by 14%. The flow integrator with temperature and pressure compensation accurately calculates the steam density in real time using a lookup table, in response to changes in steam temperature and pressure. If a flow integrator without temperature and pressure compensation is used, it can only calculate the steam density based on the data provided by the user; the error in this case is similar to the error between the data provided by the user and the actual values, and it is usually either too high or too low. http://yunrun.com.cn/upload/201812/05/201812051842313700.png Flow meter; yunrun.com.cn/product/999.html For measuring the flow rate of saturated steam, Changhui generally recommends that customers use vortex flow meters. The reason is that vortex flow meters are velocity-type flow meters, and their measurement results indicate the volumetric flow rate of steam – that is, how many cubic meters of steam pass through in one hour. In practical applications, however, people usually prefer to express the flow rate of steam in terms of mass, such as indicating how many tons or kilograms of steam pass through in one hour. Converting volume to mass flow rate (mass flow rate = density of the medium × volume flow rate) involves a key parameter: the density of the medium. The density of saturated steam is directly proportional to pressure, and the accuracy of this density value has a direct impact on the result of the mass flow rate conversion. Therefore, it is incorrect to use flow integration methods that do not include compensation for measuring steam flow rate. For steam measurement, if a flow integrator with temperature and pressure compensation is used, the chip inside the instrument can automatically detect the pressure of the steam in the pipeline, and thereby supply the corresponding density value to the flow integrator for the conversion of steam mass. As a result, aside from the basic errors of the instrument, the instantaneous flow value displayed by the flow integrator represents the actual flow rate of the steam in the pipeline.

Why doesn’t the flow meter have pressure compensation? The effect of gas temperature isn’t that significant; it’s pressure changes that have a greater impact. Both temperature and pressure compensation should be included.

It depends on whether it is superheated steam or saturated steam; single compensation is sufficient for saturated steam, while it is necessary to use both types for superheated steam

It is necessary to check whether it is superheated or saturated; for superheating, both temperature and pressure need to be taken into account

It depends on the specific situation. For example, if there is a pressure transformer in your pipeline, then it’s not necessary; the host computer can handle the compensation. If none is available, it’s better to have pressure compensation. Or you could try another brand; they come standard with temperature and pressure controls.

For multi-variable meters, internal integration of temperature and pressure sensing can be done within the meter itself; you should check the model to confirm this

For Yokogawa’s DY type, by selecting the MV option, the mass flow rate of steam can be measured directly, without the need for additional temperature or pressure compensation. However, when placing an order, it is best to provide as accurate process parameters as possible. If the range of process parameter variations is large, and it is superheated steam, pressure or density compensation should still be applied to achieve accuracy.