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Flow meters in butted condition and Mass flow meter calibration periodicity

Hi friends,

We are using 1" CMF Series flow meters in our circuit.

We are using three Mass flow meters per line with little distance apart.

We are finding deviation in performance when compared to two flow meters in line.

Can anyone tell me what is the minimum distance between flow meters to be maintained and number of flow meters that can be accommodated in a line which is less than 4 meters.

Please let me  know the periodicity of calibration toooo