The new back-purging filter from WITT prevents the clogging of filters, significantly extending the service life of gas analysers.

The back-purging device comes in a separate housing and serves as an analysis gas inlet filter on in-line gas analysers. It is particularly useful when the analysis gas is contaminated or contains particulate material, e.g. when packing powdered products.

 Back-purging filter (front)

Back-purging filter (front)

The new device registers the accumulation of particles on the filter, from the resultant line pressure increase. If the filter gets clogged, the filter element is cleaned by repeated pressure surges counter-current to the analysis gas. The dissolved contaminants are collected in a collecting bag.

It is also possible to run this filter flushing manually. No changes to the gas analyser are required and even the filters remain untouched.

The device’s stainless steel housing measures 172 x 242 x 343 mm (HxWxD), and it uses a 230 V power supply. Pressure control switches and pressure gauges are located on the front panel.

Back-purging filter (rear)

Back-purging filter (rear)