32
Translation of the original operating instructions
DUO
MIX
270
DM270_BAoDB_en_1507 • rs
Operation
5.2 Coating
Before coating, the unit must be taken into service.
1.
Set the levers at the mixing unit to „Spray“.
2.
Regulate the air pressure regulator of the proportioning pump to a low air
inlet pressure.
3.
Keep spraying the flushing agent residues in the unit into a collecting ves-
sel, until material to be processed starts flowing out.
4.
Regulate the air pressure regulator of the proportioning pump to the optimal
spraying pressure (see chapter 5.2.1).
5.
Set the operation limits for the current work step on the contact pressure
gauge of the pressure and metering monitoring (see chapter 5.2.2) and set
the switch „Manual / Automatic“ to „Automatic“.
6.
Check the pressure indication on the pressure gauges of the high pressure
filters. These must show almost identical pressure values.
The unit is now ready for operation. You can start coating.
5.2.1 Adjusting spraying pressure
Observe the following information when setting the spray pressure:
➤
The optimum spray pressure has been attained when an even material
application is obtained, with fading edge zones.
➤
Only operate the unit with the air pressure
required, in order to attain good atomisation at
the recommended spray distance of approx.
12"-16".
➤
An overly high spray pressure leads to in-
creased material consumption and paint mist.
➤
If the spray pressure is too low then this leads
to streaking and varying coating thicknesses.
12"-16"
Fig. 20: Spraying distance
Observe the operating instructions for your spray gun. They contain further
tips for the optimisation of the spray pattern.
5.2.2 Setting the pressure and metering monitoring
The black pointer on the manometer indicates the actual pressure. The two red
pointers are used to set the operating limits for the actual working process after
setting the optimum spray pressure as follows:
1.
Slide the key provided into the contact
manometer.
2.
Using the guide needle, turn the bottom red
drag indicator to a value approx. 290 psi below
the minimum pressure, which is displayed with
the spray gun open.
3.
Using the guide needle, turn the top red drag
indicator to a value approx. 290 psi above the
maximum pressure, which is displayed with the
spray gun closed.
4.
Remove the key.
Fig. 21: Operating limits
+ 290 psi
- 290 psi
