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Manual 111-082010_Nall Mass Flowmeters Page 16 of 23
8.0 DIFFERENTIAL PRESSURE
8.1 TYPICAL PRESSURE DROPS
The differential pressure drop (DP) across the Hastings HS-Series Mass Flow Transducer can vary between
0.50” H2O depending upon the transducer’s range. Other pressure drops are listed below and all are based
upon full-scale flow rates of air at 0°C and 760 Torr.
8.2 CHANGES IN DP WITH CHANGES IN LINE PRESSURE
The typical differential pressure drops listed in the table above are for operation at atmospheric pressure. As
the line pressure changes, the differential pressure drop for the same flow rate will also change.
8.2.1 Increase in Line Pressure
The differential pressure drop across the transducer will decrease proportionately as the absolute line
pressure increases as stated in the following equation:
DP = DP (@STP) Pressure (STD)
Pressure (ACT)
Where DP = Transducer differential pressure at 0oC and 760 Torr
Pressure (STD) = 14.7 psia
Pressure (ACT) = 14.7 psia + line pressure