如何正確選擇和安裝插入式電磁流量計？

準確的測量需要選擇正確的儀表、儀表的質量是主要的，其次就是要考慮安裝要求，如果安裝不規(guī)范也不能充分發(fā)揮儀表的作用，所以對于流量計的安裝，我們必須要加以重視，下面技術人員來為你介紹一下插入式電磁流量計的安裝要求及注意事項： 1、插入式電磁流量計應盡量遠離具有強電磁場的設備；

2、安裝場所不應有強烈震動，管道固定牢靠、環(huán)境溫度變化不大；

3、安裝位置必須保證管道內始終充滿被測流體，傳感器安裝管道上游側直管段長度大于8D，下游側直管段長度不小于5D；

4、清理被測管安裝底座的焊渣和毛刺；

5、將DN80球閥安裝到安裝底座上，注意球閥的長空腔向上，檢查球閥開關正常；將壓緊螺紋座套件安裝到球閥上，松開定位螺桿與壓緊螺母，將傳感器插入桿通過球閥插入被測管道。傳感器插入深度為延出底座外3mm，符合要求后，上緊定位螺桿與壓緊螺母。同時注意傳感器方向標志與流體流向一致。

6、被測管道上的開孔大于底座管，底座管插入被測管道的開孔處深度為兩邊焊口平；

7、插入式電磁流量計采用不銹鋼焊條平焊，焊后保證法蘭面與管軸線平行；

8、按插入式電磁流量計的說明書要求與轉換器標計接好電源及其它連線，上電后檢查儀表顯示，確認被測管中充滿流體且流量為零時、查看儀表顯示應為零；

9、被測管中流體流動且穩(wěn)定后，查看儀表顯示，這時轉動傳感器方向使顯示值大，鎖緊定位螺桿與壓緊螺母；

10、對于流量變化范圍大、流體速度長期低于流量計要求的低流速的場合，應考慮縮小工藝管道或采用兩臺一大一小并聯(lián)安裝的流量計；

11、插入式電磁流量計與普通電磁流量計一樣宜在垂直的工藝管道上安裝，這樣可防止懸浮的固體沉落在電極上，同時使流體中的油分上升到電極的測量范圍之外，如果流量計在水平工藝管道上安裝，則應使傳感器的電極處于水平軸線上，避免電極由于氣泡產生的干擾，導致測量誤差；

12、垂直安裝，傳感器插入管道時應與管道斷面的垂直直徑夾角小于5°，適用于測量管道振動小的清潔介質；

13、傾斜安裝，其傳感器的軸線與被測管道的軸線夾角為45°，適用于大管徑且測量介質中含有其它雜質的液體流量測量，該安裝方式水阻小，不宜纏掛。

How to correctly select and install plug-in electromagnetic flow meters?

Accurate measurement requires the selection of the correct instrument, and the quality of the instrument is the main factor. Secondly, installation requirements should be considered. If the installation is not standardized, the instrument cannot fully play its role. Therefore, we must pay attention to the installation of the flow meter. Below, technicians will introduce the installation requirements and precautions of the plug-in electromagnetic flow meter: 1. The plug-in electromagnetic flow meter should be kept as far away as possible from equipment with strong electromagnetic fields;

2. The installation site should not have strong vibrations, the pipelines should be securely fixed, and the environmental temperature should not change significantly;

3. The installation position must ensure that the pipeline is always filled with the measured fluid. The length of the straight pipe section on the upstream side of the sensor installation pipeline is greater than 8D, and the length of the straight pipe section on the downstream side is not less than 5D;

4. Clean the welding slag and burrs on the installation base of the tested tube;

5. Install the DN80 ball valve onto the mounting base, paying attention to the long cavity of the ball valve facing upwards, and check that the ball valve switch is normal; Install the compression threaded seat kit onto the ball valve, loosen the positioning screw and compression nut, and insert the sensor into the tested pipeline through the ball valve. The insertion depth of the sensor is 3mm beyond the base. After meeting the requirements, tighten the positioning screw and compression nut. At the same time, pay attention to the direction markings of the sensor being consistent with the flow direction of the fluid.

6. The opening on the tested pipeline is larger than the base pipe, and the depth at which the base pipe is inserted into the opening of the tested pipeline is equal to the welding joint on both sides;

7. The plug-in electromagnetic flowmeter adopts stainless steel welding rod flat welding, ensuring that the flange surface is parallel to the pipe axis after welding;

8. According to the instructions of the plug-in electromagnetic flowmeter, connect the power supply and other connections to the converter gauge. After power on, check the instrument display and confirm that the measured tube is filled with fluid and the flow rate is zero. Check that the instrument display should be zero;

9. After the fluid in the tested tube flows and stabilizes, check the instrument display. At this time, rotate the sensor direction to increase the displayed value, and tighten the positioning screw and compression nut;

10. For situations where the flow rate varies greatly and the fluid velocity is consistently lower than the low flow rate required by the flow meter, it is necessary to consider reducing the process pipeline or using two flow meters installed in parallel, one large and one small;

11. Insertion electromagnetic flow meters, like ordinary electromagnetic flow meters, should be installed on vertical process pipelines to prevent suspended solids from settling on the electrodes and to raise the oil content in the fluid beyond the measurement range of the electrodes. If the flow meter is installed on a horizontal process pipeline, the sensor electrodes should be placed on the horizontal axis to avoid measurement errors caused by interference from bubbles on the electrodes;

12. Vertical installation, when the sensor is inserted into the pipeline, the angle between the sensor and the vertical diameter of the pipeline section should be less than 5 °, suitable for measuring clean media with low pipeline vibration;

13. Oblique installation, the angle between the axis of the sensor and the axis of the measured pipeline is 45 °, suitable for measuring the flow rate of liquids with large diameters and other impurities in the measuring medium. This installation method has low water resistance and is not suitable for entanglement.