Introduction
Operating Principle
Fluid entering the meter passes through the inlet flow straightener, which reduces its turbulent flow pattern and improves the
fluid’s velocity profile . Fluid then passes through the turbine, causing it to rotate at a speed proportional to the fluid velocity .
As each turbine blade passes through the magnetic field, the blade generates an AC voltage pulse in the pickup coil at the
base of the magnetic pickup (see
) . These pulses produce an output frequency proportional to the volumetric flow
through the meter . The output frequency represents flow rate and/or totalization of fluid passing through the turbine flow
meter . For a complete component orientation, see
Figure 1: Schematic illustration of electric signal generated by rotor movement
Flow Direction
1
2
4
5
6
7
8
3
3
Figure 2: Typical cross section of sensor array
1
Magnetic pickup
2
Temperature sensor
3
Retaining ring
4
Downstream rotor
5
Turbine rotor
6
Upstream rotor
7
Meter body
8
Pressure sensor
Page 5
February 2015
TST-UM-00017-EN-03
