Rotary flow meters, electromagnetic flow meters, turbine flow meters, and so on cannot be used to measure steam. Previously, orifice flow meters were used to measure steam. More and more people are choosing vortex flowmeters now.
The characteristics of vortex flowmeter are small pressure loss, large range, high accuracy, and it is almost unaffected by parameters such as fluid density, pressure, temperature, viscosity, etc. when measuring volumetric flow rate under working conditions. No movable mechanical parts, therefore high reliability and low maintenance. The instrument parameters can remain stable for a long time. The vortex flowmeter adopts a piezoelectric stress sensor with high reliability and can operate within a temperature range of -20 ℃ to+250 ℃. A capacitive vortex flowmeter can be made at temperatures above 250 degrees, with analog standard signals and digital pulse signal outputs. It is easy to use in conjunction with digital systems such as computers and is an advanced and ideal measuring instrument. The vortex flowmeter is equipped with temperature and pressure compensation, and the temperature and pressure integrated vortex flowmeter makes steam measurement more stable and reliable.
So what are the characteristics of measuring steam with a vortex flowmeter
1. The table body also integrates temperature and pressure compensation functions, which can measure the standard volume flow rate or standard mass flow rate of fluids.
2. Fully intelligent and digital circuit design, capable of automatically compensating for measured fluid density or standard condition volume calculation.
3. The new digital filtering and correction functions make flow measurement more accurate and reliable.
4. The battery powered type can work continuously for more than two years without the need for an external power source.
5. The brand new dot matrix Chinese character LCD display is more convenient to use and operate.
What aspects should be noted when installing a vortex flowmeter to measure steam flow
（1）. Flow sensors can be installed indoors or outdoors, avoiding environments that endanger personal and instrument safety such as high-voltage lines, rotating machinery, toxic and harmful environments, strong mechanical vibrations, and temperature and humidity environments that do not match the usage conditions of flow sensors. Choose a place that is safe, easy to install, debug, and maintain, and has a good environment.
（2）. When designing the installation location of flow sensors, in addition to considering the conditions of the straight pipe section, sufficient operating space should also be left around the flow sensor for easy installation, debugging, and maintenance. Especially to provide safe and convenient operating space for people. When the instrument is installed at high altitude, an operating platform should be made to ensure the safety of personnel operating at high altitude.
（3）. Flow sensors can be installed on horizontal, vertical, or inclined pipelines. But when measuring liquids, flow sensors installed on vertical or inclined pipelines must ensure that the liquid flows from bottom to top to ensure that the pipeline is filled with liquid and to counteract the impact of additional gravity.
（4）. There should be longer straight pipe sections upstream and downstream of the flow sensor, and the size of the straight pipe sections varies depending on the type of pipeline upstream. According to the JB/T9249-1999 standard for vortex flow sensors, Table (3) lists the length requirements for straight pipe sections under different pipeline types upstream of the sensor.
（5）. The inner diameter of the pipeline for installing the flow sensor must be consistent with the inner diameter of the flow sensor. Otherwise, the upstream and downstream pipelines where the flow sensor is installed will need to be reduced in diameter. The principle for selecting pipe diameter is that the inner diameter of the pipeline must be consistent with the nominal inner diameter of the flow sensor. It is better to control the relative error of the two inner diameters within ± 1%. On the premise of ensuring compressive strength, the nominal pressure should be as high as possible.