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technical article
Cause Analysis of Differential Pressure Flowmeter and Flow Transmitter
2011-10-31 11:29:37

  流量变送器 原因分析 First, cause analysis of flow transmitter

流量变送器 测量时发现;在测量过程中会带来一定的误差。 We found that when measuring the flow transmitter ; there will be some errors in the measurement process.

The reasons for the errors are:

. 当流量增大 时,我们用 差压变送器 测得的 压差 要比 节流件两端的压差 高的多。 流量 . When the flow increases , the pressure difference we measured with the differential pressure transmitter is much higher than the pressure difference across the throttle .

流量计 的量程 ,我们采用的方法: 用手持终端器 设置差压变送器的压差上限 To change the range of the flowmeter , we use the method: use a handheld terminal to set the upper limit of the differential pressure of the differential pressure transmitter .

当测得 流过节流件的流量 流过高低压室的流量 相等时,我们用 差压变送器测 得的 压差才与节流件两端的压差相等 ⑵. When the measured flow through the throttle is equal to the flow through the high and low pressure chamber , the pressure difference measured by the differential pressure transmitter is equal to the pressure difference across the throttle .

的结构一般分为两种: The structure of the flow transmitter is generally divided into two types:

高压低室 a 流体流过差压变送器; ① The high pressure and low chamber a means that the fluid flows through the differential pressure transmitter;

高低压室 b 流体不流过差压变送器。 ② The high and low pressure chamber b , that is, the fluid does not flow through the differential pressure transmitter.
差压式流量 原因分析 Reason analysis of differential pressure flowmeter

差压式流量 测量时发现;在测量过程中 会带来一 误差。 We found out when measuring the differential pressure flowmeter ; there will also be some errors during the measurement .

5 条是 产生 这些 误差的原因 ;它们具体体现在: There are five reasons for these errors ; they are embodied in:

. 前者: a . The former:   测量的精确度 高,必须采用 实流标定的方法 To ensure high measurement accuracy , the method of real-flow calibration must be adopted ;

   后者不适用这种方法。 The latter: the latter does not apply to this method.

. 按照 国家标准 节流装置仅适用 50mm 50mm 以上 范围 的管径 b . According to national standards , throttling devices are only suitable for pipe diameters ranging from 50mm to more than 50mm .

. 当较小的流量获得较大的压差时,那么它只适用小于 50mm 的管径 c . When a smaller flow rate obtains a larger pressure difference, then it is only suitable for pipe diameters less than 50mm .

. 在安装方面,它们也有所不同;如 者是无限制的,而前者有条件约束,只能安装在 水平管道上 d . In terms of installation, they are also different; if the latter is unlimited, the former is conditionally restricted and can only be installed on horizontal pipes .

.前一个是变送器与传感器的分离,后一个是变送器与传感器的结合。 e . The former is the separation of the transmitter and the sensor, and the latter is the combination of the transmitter and the sensor.