Badger Meter Irrigation Sensors - 1/2 and larger" - Manual (Page 8)

CALIBRATION
Badger Meter 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 (pulse/gal) factor
alone. K and Offset numbers for each tee configuration are listed in the following tables.
Calibration Tables
The table below provides calibration and operation data for Data Industrial Metal Tee Sensors 0.5 inch to 2.5 inch.
Column 1 Tee Model Number
Column 2 Apparent I.D. - For use with the Series 900 and the Series 1000
Columns 3 and 4 The K value and Offset values to use in our frequency equation
This equation describes the frequency of the output signal of all Badger Meter flow sensors. By
substituting the appropriate K and Offset values from the table, the sensor’s output frequency can
be calculated for each pipe size. This information is required when calibrating an output board
or when using the raw sensor data as direct output to interface with a device that is not a Badger
Meter product.
Column 5 This column indicates the suggested flow range of each tee sensor. Badger Meter sensors will
operate both above and below the indicated flow rates. However, good design practice dictates the
use of this range for best performance.
Sensors should be sized for flow rather than pipe size. To prevent disturbances to the flow profile
always connect the sensor tee to pipe nipples measuring at least 10 pipe diameters in length on the
up stream (supply) side and at least 5 pipe diameters in length on the downstream (delivery) side
before making the transition in pipe size.
Calibration Table for
Series 228BR, 228CB, 250BR, 228SS
Apparent I.D. Suggested
Model for Series K Offset Operating
1000, 900 Value Range
(GPM)
228BR20xx-xxxx 1.99 2.747 0 10-100
228BR25xx-xxxx 2.52 3.741 0.386 16-160
228CB20xx-xxxx 2.07 2.809 0.276 12-120
150 PSI Tee 2.07
400 PSI Tee 2.1 2.604 0.25 12-120
228CB25xx-xxxx 2.51 3.74 0.277 16-160
228SS20xx-xxxx 1.99 2.747 0 10-100
250BR05xx-xxxx
sch40 PVC none 0.337379 0.097041 0.8-8
sch80 PVC none 0.338073 0.134854 0.8-8
sch40 steel none 0.356212 0.075729 0.8-8
Type L none 0.350899 -0.321666 0.8-8
250BR07xx-xxxx
sch40 PVC none 0.436827 0.567915 1-10
sch80 PVC none 0.43983 0.692372 1-10
sch40 steel none 0.434836 0.766196 1-10
Type L none 0.432127 0.619813 1-10
250BR10xx-xxxx 1.05 0.397368 0.261768 2-40
250BR12xx-xxxx 1.38 0.76447 0.16489 3-60
250BR15xx-xxxx 1.61 1.06526 0.0892 4-80
250 and 228 Metal Tee Impeller Flow Sensors
Page 8 August 2012