Veris Industries Badger 200 SERIES Install - Manual (Page 9)

9
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 on pages 12 and 13 provides calibration and
operation data for most scheduled pipe sizes from 3 inches
through 18 inches. For tee-mounted sensors, see either
Metal Tee (Manual Number 872021), or (Plastic Tee Manual
Number 872022).
Description of Column Information for
Pipe Sizes 3 inches through 36 inches
Column 1 Nominal Pipe Size
Column 2 Pipe O.D. as defined by ASA B36.10
and other standards
Column 3 Pipe I.D. as defined by ASA B36.10
and other standards
Columns 4 and 5 The K value and Offset that should be
used 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 6 This column indicates the suggested
flow range of sensors in each pipe
size. 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 ten pipe diameters
in length on the up stream (supply)
side and at least five pipe diameters
in length on the downstream (delivery)
side before making the transition in
pipe size.
Freq=
Gpm
K
- Offset