压缩空气是企事业单位重要的二次能源，大多由电能或热能经压缩机转换而来，而对于压缩空气流量仪表选型的问题，更是一件非常慎重的事情。下面我们先来了解下压缩空气流量涡街流量计测量的应用：
1、振动也是涡街流量计的一大劲敌。因此在使用时注意避免机械振动，尤其是管道的横向振动（垂直于管道轴线又垂直旋涡发生体轴线的振动），这种影响在流量计结构设计上是无法抑制和消除的。由于涡街信号对流场影响同样敏感，故直管段长度不能保证稳定涡街所必要的流动条件时，是不宜选用的。即使是抗振性较强的电容式、超声波式，保证流体为充分发展的单向流，也是不可忽略的。
2、涡街流量计的测量范围较大，一般10：1，但测量下限受许多因素限制：Re＞10000是涡街流量计工作的最基本条件，除此以外，它还受旋涡能量的限制，介质流速较低，则旋涡的强度、旋转速度也低，难以引起传感元件产生响应信号，旋涡频率f也小，还会使信号处理发生困难。测量上限则受传感器的频率响应（如磁敏式一般不超过400Hz）和电路的频率限制，因此设计时一定要对流速范围进行计算、核算，根据流体的流速进行选择。使用现场环境条件复杂，选型时除注意环境温度、湿度、气氛等条件外，还要考虑电磁干扰。
3、在涡街流量计测量压缩空气的过程中，涡街流量计的安装位置也是影响涡街流量计精准计量的一个重大的因素，在同心管道上前后没有阻流件、阀门、弯管的情况下，至少要保证前端10DN，后端5DN的直管段（DN表示仪表公称通径），如果有以上类似的情况，需要保证至少有前端20DN，后端10DN的直管段来保证管道内介质的流场在通过涡街流量计的时候是均匀的，在需要做变径或者缩径的情况下，需要在跟涡街流量计前后同口径的扩管或者是收缩管至少前20DN后10DN的直管然后在接现场管道。
4、介质温度对涡街流量计的使用性能也有很大的影响。如压力应力式涡街流量计不能长期使用在300℃状态下，因其绝缘阻抗会由常温下的10MΩ——100MΩ急降至1MΩ——10KΩ，输出信号也变小，导致测量特性恶化，对此宜选用磁敏式或电容式结构。在测量系统中，传感器与转换器宜采用分离安装方式，以免长期高温影响仪表可靠性和使用寿命。
Compressed air is an important two energy units, mostly by electricity or heat energy by the compressor and transformed, and for the compressed air flow meter selection problem, is a very serious matter. Below we first used compressed air flow vortex flowmeter under the understanding of the:
A big rival, is also the 2 vibration of vortex flowmeter. So pay attention to avoid mechanical vibration when in use, especially the transverse vibration of pipelines (vibration body axis perpendicular to the pipe axis and the vertical vortex), this effect is unable to restrain and eliminate in the flowmeter structure design. Because the same sensitive effect of vortex signal flow field, the straight length can not guarantee the necessary stability of vortex flow conditions, is not selected. Even the capacitance, strong anti vibration of ultrasonic, ensure that the fluid is one-way flow full development, but also can not be ignored.
4, in the process of vortex flowmeter measurement of compressed air, the vortex flowmeter installation position is also affecting the precision measurement of vortex flowmeter is a significant factor in concentric pipe before and after no baffle, valve, elbow conditions, to ensure that at least a 10DN front end, rear end of the straight pipe section 5DN (DN represents the nominal instrument path), if there is a similar situation, the need to ensure that at least the front-end 20DN and back-end 10DN straight pipe section to ensure the flow medium in pipeline is uniform in time through the vortex flowmeter, where diameter or diameter shrinkage circumstances, need with the same caliber in vortex flowmeter before and after the pipe expansion or shrink tube at least after the former 20DN 10DN straight tube and then in the next scene pipeline.
3, the temperature of the medium use performance of the vortex flowmeter has great influence. If the pressure stress type vortex flowmeter cannot be used in a 300 DEG C status under the long-term, because of its insulation resistance by room temperature 10M Omega - Omega 100M urgent to 1M Omega - Omega 10K, output signal becomes small, leading to measure the deterioration of characteristics, should choose a magnetic sensing type or a capacitor structure. In the measurement system, sensor and converter should adopt the separation installation, to avoid long-term effect of high temperature instrument reliability and service life.
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