CALIBOATION
Badger Meter Impeller sensors use unique K and offset numbers for calibration These numbers are derived from calibration
runs using NIST traceable instruments Using both a K and an offset number provides higher accuracy than using a K-factor
alone The K and offset numbers for each tee configuration are listed in the table below
Calibration Table
Size/Schedule
K
Offset
1/2" S40
0 078000
0 9
1/2" SDR 13 5
0 120119
0 1
3/4" S40
0 156300
0 9
3/4" SDR 21
0 197000
–0 6
1" S40
0 261119
1 2
1" SDR 21
0 321739
0 6
Input the information in the table above into the following equation to determine the frequency of the Series 735 Impeller
flow sensors:
Freq = gpm
K
– offset
This information is required when calibrating an output board when using the raw sensor data as direct output to interface
with a device that is not a Badger Meter product
Calibration
Page 8
October 2015
SEN-UM-01665-EN-04