What does the D1 parameter mean in Emerson mass flow meters?
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What do the markings D1, D2, K1, and K2 on the flow tube of Emerson mass flow meters mean?
D1: density of the low-density calibration medium; D2: density of the high-density calibration medium; K1: pipeline period when the sensor is filled with the low-density calibration medium (air); K2: pipeline period when the sensor is filled with the high-density calibration medium (water)
D1D2 should be the medium density, while K1K2 are the reference densities; they represent the relay outputs, I guess