是目前使用非常广泛的仪器仪表，它 是一种典 型的 差压式流量计 。 Throttling device is a very widely used instrument at present, it is a typical differential pressure flow meter . 只有 达到设计精确度的要求 ，然后 正确使用 有预想的效果 。 The throttling device can only meet the design accuracy requirements , and then use it correctly has the expected effect . 流量计的设计、制造及安装等皆符合标准规定的要求， 但是 如果不注意使用问题，也可能 造成不可弥补的错误。 Although the design, manufacture, and installation of the flow meter meet the requirements of the standards, if you do not pay attention to the use of the meter , it may cause irreparable errors. The following is a list of issues that should be noted.
在户外时候， 偏离标准规定要求是难免的，这时重要的是要估计偏离的程度，如果能进行适当的补偿是最好的，否则要加大估计的测量误差。 The working conditions specified by the throttling device standard are the so-called reference working conditions. These conditions can be met in the laboratory, but it is difficult to fully meet them on the site. When outdoors, it is inevitable to deviate from the standard requirements. At this time, it is important to Estimate the degree of deviation. It is best if appropriate compensation can be made; otherwise, the estimated measurement error should be increased.
节流装置检测件安装 在 现场严酷的工作场所， 所以 在长期运行后，无论管道或节流装置都会发生一些变化，如结垢、磨损、堵塞、腐蚀等等。 Since the detection device of the throttling device is installed in a harsh workplace on site, after long-term operation, some changes will occur in the pipeline or the throttling device, such as scaling, wear, blockage, corrosion, and so on. The detection part depends on the structure shape and size to maintain the accuracy of the signal, so any change in geometry and size will cause additional errors. 是，测量误差的变化并不能从信号中觉察到，因此 必须 定期检查检测件 ，这 是必要的 也是必须的 。 It is regrettable that the change in measurement error cannot be detected from the signal, so it is necessary to regularly inspect the test piece , which is necessary and necessary . 是 无法作统一规定 的。 The inspection cycle can be determined according to the condition of the measurement medium, and the length of the cycle cannot be uniformly specified .
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