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At room temperature and low pressures the volumetric and mass flow rate will be
nearly identical, however, these rates can vary drastically with changes in temperature
and/or pressure because the temperature and pressure of the gas directly affects the
volume. For example, assume a volumetric flow reading was used to fill balloons with
250 mL of helium, but the incoming line ran near a furnace that cycled on and off, intermittently heating the
incoming helium. Because the volumetric meter simply measures the volume of gas flow, all of
the balloons would initially be the same size. However, if all the balloons are placed in a room
and allowed to come to an equilibrium temperature, they would generally all come out to be different
sizes. If, on the other hand, a mass flow reading were used to fill the balloons with 250 standard
mL of helium, the resulting balloons would initially be different sizes, but when allowed to
come to an equilibrium temperature, they would all turn out to be the same size.
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Please see our Theory of Operations page for information on converting mass flow to volumetric flow.
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All Alicat Scientific devices reference 25ºC and 14.696 PSIA (101.32kPa) unless ordered
otherwise. Please refer to the calibration sheet included with your device to confirm the reference point.
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No, the meter’s operation is uni-directional, reversing the flow direction will inflict no
damage as long as the maximum specified limits are not exceeded. Please note that controllers
will not seal effectively against pressure / flow reversals.
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Maximum operating line pressure is 125 PSIG (862 kPa). Note: Exceeding the maximum
specified line pressure may cause permanent damage to the solid-state differential pressure
transducer within the device.
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Because the flow meters and controllers set up a laminar flow condition within the flow body, no straight runs of
pipe are required upstream or downstream of the meter.
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