Operating principle, Operating principle 5 – Badger Meter MC4000 Diagnostic Test Equipment User Manual
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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 pick-up (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
Pickup
Magnetic
2
Sensor
Temperature
3
Ring
Retaining
4
Support
Downstream rotor
5
Rotor
Turbine
6
Support
Upstream rotor
7
Body
Meter
8
Sensor
Pressure
Page 5
Month 2014