Principle of operation
Rotameters are utilised for the
flowrate measurement of most liquids
and gases with direct readout of
flowrate.
A special "float" is fitted within a
tapered glass tube. With the flow
vertically upward through the meter,
the float settles at a position where its
mass is balanced by the upward
forces of the flow through the annulus
between the tube and float. The
greater the flow the higher the float
rises to increase the annulus and
balance. The top edge of the float is
read against the scale, giving an
instantaneous reading of the flow
rate.
Various methods of alarm output are
available for signalling low or high
flowrate measurement of most liquids
and gases with direct readout of
flowrate.
A special "float" is fitted within a
tapered glass tube. With the flow
vertically upward through the meter,
the float settles at a position where its
mass is balanced by the upward
forces of the flow through the annulus
between the tube and float. The
greater the flow the higher the float
rises to increase the annulus and
balance. The top edge of the float is
read against the scale, giving an
instantaneous reading of the flow
rate.
Various methods of alarm output are
available for signalling low or high
