Magnum Venus Plastech DP-1000 (EPO3) - Manual (Page 15)

CHAPTER 4
PRIME THE UNIT (contd.)
Find Mixing Ratio
Consult your material data sheet to find proper mixing ratio. Set variable-stroke length pump to proper ratio
number as stamped on top edge of slave-arm (see Figure 12)
Choose Pump Size
To select the correct pump size, perform the following steps:
If the material requires greater than a 4:1 ratio, use a smaller diameter variable-
stroke fluid pump (1 ¼”). In
this case, refer to the number stamped on the left side of the slave-arm (seen from back of unit)
If the material you are using requires 1:1 through 4:1 mixing ratios, you should normally be operating with
matched standard fluid pumps (1 ¼”). In this case, refer to the number stamped on the right side of the slave-
arm.
Set Pump To Ratio
Stop the pump at this time.
Set variable-stroke length pump to proper ratio number (stamped on top edge of slave arm). If the material
ratio falls between two numbers (such as 2.1:1), estimate fractional position between the two numbers. Lock
the pump in position by tightening all 4 bolts on the slave arm adjusting bracket.
(Figure 12. Set Pump To Proper Number Ratio)
Test For Proper Settings
Note: Read through this section completely before beginning the flowing procedure.
After setting and locking the pump position, you are ready to test the unit for proper ratio settings.
Check that all pressure has been removed from fluid pressure accumulators.
The accumulators are the tall, narrow cylinders attached to the side of each pump. To relieve
ACCUMULATOR PRESSURE, turn RECIRCULATION PRESSURE regulator to zero and switch recirculation
pressure switch to “ON”. All fluid should then drain from the accumulator hoses into material containers.
Turn on the RECIRCULATION switch to have the materials exit the hoses into the material containers. Wait
for a steady stream of material. Have a helper hold the two recirculating hoses over material containers while
someone quickly places two pre-weighed containers from the stream after the length of time you have chosen.
If you are checking ratios by volume it is not necessary to pre-weigh containers.