Badger Meter Positive Displacement - Manual (Page 13)

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tests. If the problem continues, it may be necessary to relocate
the offending device.
If flow readings are too low: If the display shows significantly
less than the volume actually dispensed, then most likely the
meter has a high slippage factor and the fluid is by-passing the
gears and the K-factor may require adjustment.
If it is necessary to adjust the existing K-factor: Trigger at least
500ml of your sample fluid, in a steady stream, at approximately
the desired flow rate, into a graduated beaker. Compare the
volume in the beaker to the volume on the display. Do not time
the operation merely measure the volume dispensed. Repeat the
sample 3 times and take an average. If the result is outside an
acceptable margin, adjust the K-factor by the percentage
difference between the average beaker sample and the average
displayed total. If the error is not corrected, clean the meter
thoroughly and repeat the procedure. Do not use water for this
test.
If it is necessary to re-calculate a new K-factor: You will first
need a data collecting instrument to count pulses produced by the
meter. A Blancett display may be used in totalizer mode
provided the KFT is set to count each pulse (KFT = 10000).
Trigger at least 500ml of your sample fluid, in a steady stream, at
approximately the desired flow rate, into a graduated beaker.
Divide the number of pulses by the volume dispensed and the
result is your new K-factor in the units of your sample. In the
example above the K-factor units would be impulses/ml.