Graco ProMix II Operating Manual page 50

Meter Calibration ◆
7.
One at a time, dispense component A and B into
separate beakers.
a.
To avoid splashing, slowly open sampling
valves (2A, 2B).
b.
For more accurate calibration, adjust the valve
to dispense at a flow rate similar to your pro-
duction spray flow rate.
c.
Dispense a minimum of 250 cc of each com-
ponent; make sure enough material is dis-
pensed to accurately read the volume with
your beaker. The A and B volumes do not
have to be equal or at any particular ratio.
d.
Close each sampling valve tightly.
8.
The volume that the ProMix™ II measured displays
on the EasyKey™ Display.
9.
Compare the amounts on the EasyKey™ Display to
the amount in the beakers.
For maximum accuracy, use a gravimetric (mass)
method to determine the actual volumes dis-
pensed.
10.
If the screen and actual volumes are different, enter
the actual dispensed volume in cc for A and B Vol-
ume fields, and press
If the values were substantially different, repeat the
calibration process.
If the screen and actual volumes are the same or if
for any reason you want to cancel the calibration
procedure, scroll to Abort on the Calibration
drop-down list and press
50
Volume
Measured
.
.
11.
After the volumes for A and B are entered, the con-
troller calculates the new flow meter K-Factor and
shows them on the Calibration screen.
.
K-Factor values on the screen are viewable only. If
needed, you can manually edit the K-Factors in
Advanced Screen 2 (see page 37).
12.
Always purge sampling valves after calibrating
meters. Use one of the following methods.
• Follow the Purging Sampling Valves and
Tubes procedure, page 48.
• Place the sampling valve fluid tubes into a com-
patible cleaning fluid (TSL or solvent) or cap
them.
If fluid hardens in sampling tubes, replace them
with 5/32 in. or 4 mm OD tubing.
13.
Make sure both sampling valves (2A, 2B) are
closed and both fluid shutoff valves (1A, 1B) are
fully open.
1A
2A
14.
Before you begin production, clear the system of
solvent and prime it with material.
a.
Select Mix
b.
Trigger the gun into a grounded
metal pail until mixed material
flows from the gun nozzle.
c.
To begin operation, see Start
Up, page 39.
2B
C
on the Operator Station.
310633C
1B
page 24