Design and Installation of Double Range Differential Pressure Flowmeter

For a specific flow measurement device, the same differential pressure signal transmission is distorted, and its influence is not certain when the flow rate is different. Among them, when the relative flow rate is large, the effect is small, and when the relative flow rate is small, the effect is large. It is because when the relative flow rate is small, the differential pressure signal sent by the throttling device is small. Therefore, in the design and installation of the dual-range differential pressure flowmeter, special attention should be paid to the transmission distortion of the differential pressure signal, and try to avoid this distortion as much as possible. Figures 3 and 3 show an example of using an integrated method to avoid distortion of differential pressure signal transmission. In the figure, the condenser is replaced by a condenser pipe, and the pressure guide pipe is also very short. There are no parts that cause transmission distortion between the throttling device and the differential pressure transmitter. As long as the horizontality of the art pipeline is good, the differential pressure signal Transfer distortion is negligible. Selection of high and low ranges For a set of dual-range differential pressure flowmeters, the selection of high and low range switching points is an important part of the design, which is not only restricted by range requirements, allowable pressure loss, and system uncertainty, but also Subject to DP transmitter specification. The following principles should be followed in the specific design calculation. ① On the premise that the pressure loss is allowed, the upper limit of the differential pressure of the high range should be selected as large as possible. In this way, the differential pressure value corresponding to the minimum flow rate can be correspondingly larger, so as to reduce the influence of various interference factors on the measurement accuracy of small flow rate. The system uncertainty can meet the requirements of users. In particular, it is necessary to ensure the system uncertainty when the flow rate is large. I don't have to emphasize the uncertainty of the flow regulator, so the flow rate varies in a wide range, and the corresponding changes in the outflow coefficient and the expandability coefficient are relatively large, but these changes can be included in the secondary table. Get compensated and corrected. The final impact on the system uncertainty is still negligible.

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