PathMaster® Manual Rev. H 6/03
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5) Replace the spray cap.
6) While purging, adjust the atomizing air until the spray is satisfactory. Test the spray pattern on scrap.
If the atomizing air is too high, the spray will be misty. If it is too low, there will be splatter. Thin, solvent
based materials usually require as little as 0.5 P.S.I., while some silicones require as much as 15 P.S.I.
Extended Spray Cap
This cap is exclusive to the FCS100-ES valve. It is identified by its small long cylinder nozzle. This cap
can reach into tight areas between tall components, were a very defined pattern is required.
Round Spray Cap
This provides a circular spray pattern. It is identified by its lack of external air ports. It works well for
solvent based materials or where a smaller, more defined pattern is required.
Flat Spray Cap
The spray from this cap is rectangular/oval in shape. It is identified by the protruding atomizing air ports.
It works best with non-solvent based materials and provides a wider spray path for increased coverage.
Programming
Once the physical parameters are successfully established for the delivery system, they should never be
altered. The best method for changing the material output is to alter the program. In most cases, raising or
lowering the speed of a dispense path is enough to change the material output to the desired level.
When programming with the dispense valve, lower the valve so that the end of the needle is close to the
part surface, but not too close such that varying needle length tolerances will cause the needle to make
contact with the surface of the product.
With the spray valve, a good rule of thumb is to start about ¾” (19 mm) above the product surface. With
atomizing air, this should produce a spray width approximately ½” to ¾” (19 mm) wide. If necessary,
adjust the spray height so the pattern on the product is consistent and uniform.
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