Hi, We are using the forward flow calibration data for reverse flow also to make it bidirectional. Forward flow calibration data: Range1 Range2 Range3 Minimum VFR 5.08764 143.946 576.406 Slope 1.2803 1.4255 1.45557 offset -1.5137 -16.4593 -23.796 Reverse flow calibration data: Range1 Range2 Range3 Minimum VFR - 5.08764 - 143.946 - 576.406 Slope 1.2803 1.4255 1.45557 offset -1.5137 -16.4593 -23.796 We added the minimum VFR with a negative sign for reverse flow; the remaining slope and offset values are the same as those from the forward flow calibration data. However, this method of reverse flow calibration is resulting in an accuracy issue. Before using this method, we had added only Range 1 in the negative calibration data, and the accuracy for reverse flow was acceptable. But when we added two additional ranges (Range 2 and Range 3) for reverse flow, accuracy issues began to appear. Best regards, SaKhan
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