The outlet of the shielded pump is divided into two paths
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The sample for our on-line analyzer is taken from the outlet pipeline of the shielded pump, and after passing through the analyzer, it returns to the inlet of this pump. But the outlet of this pump leads to the vacuum tower, where the pressure is around -91; could the negative pressure in that tower prevent the analyzer from accepting samples? Or siphoning may occur due to reasons such as a high flow rate at the pump outlet, preventing the analyzer from accessing the sample
Is the pressure at your pump outlet negative? In the pipeline before the feed control valve, the pressure is roughly equal to the pressure difference at the pump outlet. After the control valve, it drops rapidly to near the tower pressure