• Witt's new back-purging filter is built into the suction pipe, where it does its job automatically.
    Witt's new back-purging filter is built into the suction pipe, where it does its job automatically.
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A new development by German gas technology company Witt aims to extend the service life of gas analysers.

Fine-grained foods make the validation of the protective gas atmosphere more difficult, because tiny particles clog the filters on these machines.

"Gas analysers do have built-in filters to protect the pump and sensor," Witt's Martin Bender says.

"However, clogging is unavoidable when particles get sucked in."

Witt's new back-purging filter is built into the suction pipe, where it does its job automatically.

Whether dealing with milk powder, coffee, or flour dust, 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. 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 230V power supply. Pressure control switches and pressure gauges are located on the front panel.