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DANGER
Alerts user to avoid or correct conditions
that will cause death or serious bodily injury.
WARNING Alerts user to avoid or correct conditions
that could cause bodily injury.
The standard Graco PrecisionMix can blend all popular
two-component epoxy or polyurethane paints. For infor-
mation on handling abrasive fluids, contact your Graco
representative or Graco Technical Assistance (see back
page). The PrecisionMix is not for use with "quick-set-
ting" paints (those with a pot life of less than 30 minutes).
The system can be set up to mix components supplied
from pressure vessels, from feed pumps transferring the
materials from their original containers, or from a central
paint recirculating line.
The standard unit is designed to operate an air spray sys-
tem with a capacity of up to 1000 cc/min with 80 psi (5.6
bar) fluid feed pressure. Higher flow rates are possible.
Operating Cycle
To begin operation, the spray gun operator turns ON the
ON/OFF switch, adjusts the SETPOINT selectors to de-
termine the appropriate volume ratio of the two compo-
nents to be mixed (according to the guidelines on pages
CONTROL
PANEL
VOLUME COUNTER A
MIXING
BLOCK
INTEGRATOR
STATIC MIXER
TUBE
Fig. 1
DEFINITION OF TERMS
HOW THE P
RECISION
AIR CONTROL
ASSEMBLY
DISPENSE
VALVE B
DISPENSE
(CATALYST)
VALVE A
(RESIN)
VOLUME COUNTER B
CAUTION
Alerts user to avoid or correct conditions
that could cause damage to or destruction
of equipment.
NOTE
Identifies essential procedures or helpful in-
formation.
M
WORKS
IX
12 and 13), and presses the START button on the control
panel. From that point on, normal operation of the Preci-
sionMix is controlled by the operation of the spray gun.
When the gun is triggered, the two components enter the
PrecisionMix through separate filters and check valves,
then are precisely monitored by two volume counters
(see Fig. 1). The measuring element of the volume
counters consists of two precision gears and an electron-
ic sensor system. The sensors produce electrical im-
pulses according to the gear tooth movement, signaling
two counts for each tooth. Volume counters are available
with the following volume displacement: 0.1, 0.4, and 1.6
cc/tooth.
The signals from the volume counters are compared to
the settings which were entered into the SETPOINT se-
lectors. The actual ratio between the two components is
infinitely variable from 1:1 to 20:1 (depending on the vol-
ume counters used). However, it is best not to exceed a
ratio of 10:1; for higher ratios, change the volume count-
ers to obtain better tolerance control.
AIR PURGE
VALVE
SOLVENT PURGE
VALVE
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