Owner manual

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 through the meter by using a calibrated
volumetric container or by weighing the container.
• Note volume of fluid indicated by meter.
• Note present scale factor on (4) rotary switches.
• Use the following formula to calculate the new
Scale Factor for recalibration:
• Enter new scale factor on the rotary switches.
• Rerun test to verify that the recalibration is correct.
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.
Using the formula:
Qty Delivered Old Scale New Scale
Qty on Meter Factor Factor
X
=
The Model 7500S is provided tested and calibrated with
a test configuration included with each meter when
shipped. If recalibration of your system accuracy may
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
be required, the Model 7500S provides a feature, using
(4) rotary switches, that permits a simple recalibration
procedure. (see below)