Why does measuring saturated steam with the vortex flow meter require temperature and pressure compensation?

With the continuous development of industrial production, flow measurement is more and more widely used in various fields. The vortex shedding flow meter is a commonly used measuring instrument in the steam flow measurement. However, when measuring saturated steam with a vortex flow meter, the vortex flow meter needs to be compensated for temperature and pressure. Next, we will analyze the reasons.

When a liquid is heated, its molecules gain enough energy to overcome surface tension and break away from the liquid surface, turning it into a gas. When the saturated state is reached, the mutual transformation of liquid and gas reaches dynamic equilibrium, and the steam is saturated steam at this time. At different temperatures and pressures, the density and velocity of saturated steam can vary. Therefore, the compensation method of temperature and pressure is necessary.

How is the temperature and pressure compensation achieved? Generally speaking, we need to realize it through the following steps.

First, we need to measure the gas temperature and pressure, which can be achieved by installing temperature and pressure sensors. We need to install the probes of sensors close to the vortex flow meter to avoid errors caused by long distances.

Next, we need to calculate the correction factor based on the measured gas temperature and pressure.

Finally, we need to multiply the flow measurement by the correction factor. It corrects the effects of temperature and pressure variations on the flow measurement results and improves the accuracy of the measurement.

The measuring principle of the vortex flow meter is based on the vortex effect. When a fluid passes through the vortex shedding flow meter's resisting fluid, it creates a rotating flow on both sides of the resisting fluid in the vortex steam flow meter. The vortex transmitter measures the fluid flow by detecting this rotating flow. However, when the density and velocity of the fluid change, the measurement results of the vortex steam flow meter will also be affected. Therefore, for the vortex transmitter to measure more accurately, it needs to be compensated for temperature and pressure.

In addition, temperature and pressure compensation also have a great impact on the vortex steam flow meter measurement accuracy and service life of vortex flow meters. If we measure saturated steam without temperature and pressure compensation, then the measurement results of vortex flow meter will be inaccurate. This will lead to energy waste, unstable product quality, and other problems. At the same time, due to the complex internal structure of the vortex steam flow meter, long-term work in a high-temperature and high-pressure environment will cause damage to the vortex transmitter, shortening the service life of the vortex steam flow meter. Therefore, to protect the vortex transmitter, save energy, and improve product quality, we need to carry out temperature and pressure compensation when measuring saturated steam.

In summary, it is necessary to perform temperature and pressure compensation when using a vortex transmitter to measure saturated steam. It not only eliminates the effects of temperature and pressure on the measurement results of the vortex shedding flow meter but also improves the measurement accuracy and service life of the vortex shedding flow meter.