Badger Meter 7500 Series Mag Meter - Manual (Page 6)

CALIBRATION
RECALIBRATION PROCEDURE
If it is necessary to recalibrate the meter, this can be done
by changing the Scale Factor which is set on the four (4)
Rotary Switches located in the upper left hand corner.
(See above figure) To make this change, the following
steps are necessary.
• Determine the exact quantity of fluid that actually
passed thru the meter by using a calibrated volumet-
ric container or by weighing the container.
• Note volume of fluid indicated by meter.
• Note present Scale Factor on (4) rotary switches.
• Use the following formulas to calculate the new
Scale Factor for recalibration:
• Enter new scale factor on the rotary switches.
• Rerun test to verify that the recalibration is cor-
rect.
EXAMPLE:
You have a 3" size meter in your installation. You run a test
batch quantity of 238 gallons. The totalizer on the meter
indicates 203 gallons. Your present scale factor on the four
(4) rotary switches is .2533.
Qty Delivered Old Scale New Scale
Qty on Meter Factor Factor
X =
The Model 7500P is provided tested and calibrated with a test
configuration included with each meter when shipped. If reca-
libration of your system accuracy may be required, the Model
6
238
203
X .2533 (Old Scale Factor) = .2969 (New Scale Factor)
½" Meter (1-30 gpm) Scaling Factor
1 Pulse Per Gallon .0500
10 Pulse Per Gallon .5000
100 Pulse Per Gallon .5000
500 Pulse Per Gallon .5000
1 Pulse Per Liter .5000
1" Meter (3-80 gpm)
1 Pulse Per Gallon
.5000
10 Pulse Per Gallon .5000
100 Pulse Per Gallon .5000
500 Pulse Per Gallon .5000
1 Pulse Per Liter .5000
2" Meter (10-315 gpm)
1 Pulse Per Gallon .2500
10 Pulse Per Gallon .2500
1 Pulse Per Liter .0946
3" Meter (24-690 gpm)
1 Pulse Per Gallon
.2533
10 Pulse Per Gallon .2533
1 Pulse Per Liter .1892
4" Meter (40-1200 gpm)
1 Pulse Per Gallon
.5000
10 Pulse Per Gallon .5000
1 Pulse Per Liter .1892
x0.1 x0.01 x0.001 x0.0001
2 9 6 9
7500P provides a feature, using (4) rotary switches, that permit
a simple re-calibration procedure. (see below)