Badger Meter QuikSert - Manual (Page 5)

INTRODUCTION
The B142 gas turbine flow meter is designed with wear resistant moving parts to provide a long service life with very low
maintenance . Should the B142 meter be damaged, the turbine is easily replaced in the field with a drop-in repair kit rather
than replacing the entire flow meter (see Replacing Turbine Cartridges on page 15 for repair kit information) . Repair parts are
constructed of stainless steel alloy and tungsten carbide .
THEORY OF OPERATION
Gas moving through the turbine flow meter causes the rotor to turn at a speed proportional to the flow rate . The rotor blade
cuts the magnetic field that surrounds the magnetic pickup, which in turn generates a frequency output signal that is directly
proportional to the volumetric flow rate (see Figure 1 ) . The signal is used to represent flow rate and/or totalization of a gas
passing through the turbine flow meter and is always expressed as the number of electric pulses that the meter produces per
cubic foot . This value, called the K factor, is constant over each flow meter’s range and is unique to the meter .
Rotor
Magnetic
Pickup
Output Signal
Figure 1: B142 turbine flow meter
User Manual
Page 5 June 2014