Badger Meter Series 4000 Sensor - 1/2, 3/4", 1" - Manual (Page 13)

PVC schedule 80 pipe of the appropriated diameter is installed upstream of the sensor, and a similar 5 to 10 diameter lengths
downstream.
PVDF sensor calibration is based on flow through industry standard PVDF pipe. Similar action should be taken if the PVDF
sensor is used in a system based on other piping technologies.
CALIBRATION TABLE-DIGITAL OUTPUT
The following table provides calibration and operational data for the various models of the Badger Series 4000 sensor. The
data is organized as follows:
Column 1: Model number, to which the data listed in the particular column pertains
Column 2: Housing material
Column 3: Nominal pipe size
Column 4: Pipe O.D., per applicable standards
Column 5: Pipe I.D., per applicable standards
Column 6: Slope of the regression line used in calibration (K)
Column 7: Intercept of the regression line (Offset)
Column 8: Minimum recommended flow rate (GPM)
Column 9: Maximum recommended flow rate (GPM)
Column 10: Pulse rate at minimum flow (Hz)
Column 11: Pulse rate at maximum flow (Hz)
The calibration constants in columns 6 and 7 relate frequency (Hz) to flow rate (GPM) in the equations:
FREQ= GPM
K -Offset
GPM = K (FREQ + Offset)
Installation & Operation Manual
Page 13 April 2012