FILTER OPERATION
Unfiltered coolant is pumped into the inlet header (6), through the flexible hoses and into each filter plate in the filter stack. On the opposite side of the filter, filtered coolant flows from each plate, through flexible hoses to the outlet header and then to the filtered coolant storage tank.

INDEXING (Clean Cycle)
As the filter receives and retains debris, the pressure at the inlet will increase. When this differential pressure reaches 30 psi the filter requires indexing to remove the retained debris and spent filter paper. This operation is initiated at the filter control panel. The following steps are automatically controlled by the PLC:

• Coolant flow through the filter is stopped.
• Compressed air automatically (8) evacuates all coolant from the filter stack and dries the filter paper in-situ.
• The filter plates are opened.
• The paper extractor is operated to remove filtered debris and spent filter paper, simultaneously pulling new filter paper into each filter plate.
• The filter plates are closed and the filter returns "on-line" automatically.
• Index time is 10 minutes.

FILTER AREA/FLOW RATES/FILTER MEDIA
The Schneider filter can be configured with any number of filter plates up to a total of 80 plates - for a maximum filtration area, each filter, of 870 ft.² (80.9m²).

Typically, coolant emulsions are filtered at a flux rate of 1.5 - 5.0 gpm/ft.² (60- 200 l/min/m²), depending on the type of emulsion used, the debris type and the filtrate quality required.

A complete range of specialized filter media is stocked by the J.R. Schneider Co.