Flow Detectors
HEAD FLOW METERS
HEAD FLOW METERS
Flow measurement is an important process measurement to be considered in
operating a facility’s fluid systems. For efficient and economic operation of these
fluid systems, flow measurement is necessary.
EO 1.1
EXPLAIN the theory of operation of a basic head flow
meter.
EO 1.2
DESCRIBE the basic construction of the following types
of head flow detectors:
a.
Orifice plates
b.
Venturi tube
c.
Dall flow tube
d.
Pitot tube
Head flow meters operate on the principle of placing a restriction in the line to cause a
differential pressure head. The differential pressure, which is caused by the head, is measured
and converted to a flow measurement. Industrial applications of head flow meters incorporate
a pneumatic or electrical transmitting system for remote readout of flow rate. Generally, the
indicating instrument extracts the square root of the differential pressure and displays the flow
rate on a linear indicator.
There are two elements in
Figure 1 Head Flow Meter
a head flow meter; the
primary element is the
restriction in the line, and
the secondary element is
the differential pressure
measuring device. Figure
1 shows the basic operating
characteristics of a head
flow meter.
Rev. 0
Page 1
IC-04
