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HDF-F
Optional Oil Pre-Filtration Package
In many instances where there is a steady compressed air demand,
oil prefiltration is highly recommended to increase the life of
the dryer's desiccant bed. An HDF-F option is available with all
the following pre-assembled features:
• Hankison HDF Series desiccant compressed air dryer
• Hankison HF Series Grade 5 oil filter to 0.01 ppm
(0.01 mg/ml) remaining oil content
• Filter element change-out slide indicator based on differential
pressure
• Wall-mounting bracket pre-assembled to the dryer
• Modular connection kit provides a space saving connection between
the prefilter and the dryer
• Reliable internal automatic drain discharges liquid
• Liquid level indicator on filter
Operation
Contaminated compressed air enters the oil prefilter housing
and flows from the inside of the element to the outside of the
element. The filter element should be changed when the filter
element change-out indicator changes from the color green to the
color red during usage. Water and oil conden- sate fall to the
bottom of the housing where it is discharged by the automatic
drain. The filtered compressed air exits the filter outlet port.
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The compressed air enters the
desiccant dryer housing and flows downward through a bed of silica
gel desiccant. As the desiccant bed gets saturated, the color of
the desiccant change-out indicator changes from blue to white. At
the bottom of the housing, the compressed air flows upwards through
an integrated dust filter and into an outlet air stem which takes
it to the outlet port of the dryer housing.
Table 3
Silica Gel Desiccant Charges
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