Badger Meter MC4000 Diagnostic Test Equipment - Manual (Page 5)

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 Figure 1 ) 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 2
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