Graco PRECISION MIX 949-999 Manual page 20

Proportioning controller
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Setup Screens (Continued)
Component A Flow Meter Calibration Factor
A FLOWMETER
VALUE IS .XXX
NEW VALUE? >XXX
NO
TEST
QUIT
Press NO to go to Comp. B Flow
Meter Calibration Factor screen.
Press TEST to go to next screen.
CAUTION
Before pressing the TEST key, close the fluid shut-off
valve on the Component A side of the Precision Mix™
manifold. The fluid must be shut off as pressing the
TEST key will automatically open the Component A
(resin) valve.
Resin Flow Meter Calibration Test
RESIN FLOWMETER
CALIBRATION XXXX
ENTER VOL XXXX
QUIT
CAUTION
Do not run a second calibration test until you exit
Setup and enter the Run mode. After you do that,
you can re-enter Setup to do a second test.
20
684-015
Pendant Screens
Since flow meters come in many different sizes and
styles, it is necessary to tell the Precision Mix™
Control what size the flow meters are so it can
properly read the electrical pulse the flow meter sends
to it.
Component A flow meter. The flow meter size must
be entered in cubic centimeters per electrical pulse.
You cannot enter a whole number. The number you
enter must be a 3 digit decimal, but do not enter the
decimal point. Example: If the electrical pulse of Flow
Meter A - 1 equals 0.230 cc, you would press the 2,
the 3, and the 0 on the pendant keyboard. Then press
ENTER. The new value will display on line two.
See manual 308-243 for the most commonly used flow
meter sizes. If you do not know the size of the flow
meter or do not feel the number is accurate, make
sure the fluid supply is shut off, then press the TEST
key to go to the Flow Meter Calibration Test screen,
below.
NOTE: The Component A fluid shut-off valve must be
closed before you come to this screen.
CAUTION, above.
This screen allows you to produce a custom
calibration factor for the resin (Component A) flow
meter. To find the proper calibration factor, follow this
procedure:
1.
Place a container under the resin ratio check
valve tube.
2.
Open the resin ratio check valve. Make sure there
is no air in the ratio check port.
3.
Close the ratio check valve.
4.
Press the QUIT key.
5.
Press the TEST key.
6.
Weigh a clean container and record the weight.
7.
Place the container on a scale under the ratio
check valve tube.
8.
Open the ratio check valve. Allow an adequate
quantity of a fluid, that is of a know accurate
weight per gallon, to flow into the container.
9.
Close the ratio check valve.
10. Weigh the sample and calculate how many cubic
centimeters of fluid was dispensed.
On line two of the Flow Meter Test screen there will be
a number that represents how much fluid the Precision
Mix™ determined wad dispensed, based on the
previously entered calibration factor. To enter a new
calibration factor, key in how much fluid was actually
dispensed (four digit number in cc) and press ENTER.
This will take you back to the Component A Flow
Meter Calibration Factor screen, shown above. The
new calibration factor will display on line two.
With this screen, you input the size of the
See the

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