Spray equipment setting
Fluid Pressure: 100-150 Bar
Air Assistance: As required but not greater than 2 Bar
Tip size: 0.028mm to 0.033mm (11-13 thou)
For fluid pressure, air assisted airless pumps will all show a conversion ratio on them. For example the Wagner Puma is described as a 28:40 pump. The first number, 28 refers to the conversion ratio. On a WIWA profit 4233 the ratio is shown on the pump stating it is 33:1. For a 28:1 pump the pressure in bar on the fluid pressure dial should be multiplied by 28 to give the actual fluid pressure being used to deliver the paint. This means with that pump the dial needs to be set between approximately 3.5 and 5 bar. For a 33:1 pump multiply by 33 to get the required pressure so set the dial between 3 and 4.5 bar. Other main pumps such as Graco, Kremlin and Binks will also have the conversion ratio written somewhere on the pump.
With regards to nozzle sizes we have given metric figures of 0.028mm to 0.033mm and then given the imperial measure of 11-13 thou in brackets. These old imperial measurements tend to be used by most of the spray equipment manufacturers. Examples are as follows.
Wagner tips (or nozzles) have the description of 11/40 where the 11 refers to the tip size in thou (short for thousandth of an inch) and 40 relates to a 40 degree angle fan. On a WIWA tip it may carry a description such as 411 where the 4 is for a 40 degree angle fan and the 11 is for an 11 thou tip size. They can also have 428 written on a nozzle meaning 40 degree angle and an 0.028mm tip size.
Kremlin do not use these units for their tips so a Kremlin 06 sized tip is an 11 thou and a Kremlin 09 tip is a 13 thou.