Witt back-purging filters are built into the suction pipes of gas analyzers, where it does its job automatically. The back-purging device registers the accumulation of particles on the filter from the resultant line pressure increase. If the filter gets clogged, it is blown clean from behind. It is also possible to run this filter flushing manually. The device’s stainless steel housing measures 6.77 x 9.53 x 10.63 inches (HxWxD). Pressure control switches and pressure gauges are located on the front panel.