Information required in order to specify correctly:

1) Give compressor Make ……………………… Model………………………
This is to assess how much air pressure and flow the compressor supplies.

2) How much air does the compressor deliver?
The most popular units to measure air flow are: L/min; m³/H; SCFm or ft³/H

3) What is the operating/line pressure?
This is most commonly between 6Bar / 600kpa and 8 Bar / 800 kpa
Line pressure may also be measured in Pa (Pascal -one pascal is equivalent to one newton (1 N) of force applied over an area of one meter squared (1 m2)); psi (pounds per square inch); nm² (square nanometre)

4) Is the compressor oil free or lubricated?
This information is required to assess if an oil filter / or oil separator is required. An oil filter is required on an oil-based compressor, to maintain the life of the desiccant.

5) Will the unit be located indoors or outdoors?
This information is required to assess the quality of air entering the main compressor which will feed into the air dryer. If the surrounding air is very dusty or very moist more pre-filters may be required to prolong the life of the desiccant.

Polar Air uses regenerative desiccant dryers so the temperature at which the air enters the dryer is not required to spec an air dryer.
The above assures that the Air Dryer is specified for the maximum air flow of the compressor, when the system is operating at maximum capacity.
Once all measurements are obtained, calculate the correct model of Air Dryer required by taking the operational line pressure and marking it off on the vertical access. Then the compressor air flow on the horizontal axis and the meeting point will indicate which Air Dryer model is most suitable for your specifications.