An impinger system is a device in which particles are removed by impacting the aerosol particles into a liquid.
2.
Formaldehyde levels in air can be sampled and tested in several ways, including impinger, treated sorbent, and passive monitors.
3.
The pies were snap frozen ( in a spiral freezer ) in a raw state and distributed to stores, where they were freshly baked using impinger ( conveyor ) ovens.
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