Flow indicator device for respirators
This application claims priority from United Kingdom Serial No. 9906322.4 filed Mar. 19, 1999. A respirator that comprises a head piece () that is shaped to form a breathing zone () around at least the nose and mouth of the wearer, and an air flow passage () for supplying a forced flow of air to the...
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| Sprache: | eng |
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| Zusammenfassung: | This application claims priority from United Kingdom Serial No. 9906322.4 filed Mar. 19, 1999.
A respirator that comprises a head piece () that is shaped to form a breathing zone () around at least the nose and mouth of the wearer, and an air flow passage () for supplying a forced flow of air to the breathing zone. The air flow passage has a constricted portion () that includes a flow detecting orifice (). The forced flow of air generates suction at the flow-detecting orifice. A pressure-responsive indicator device () is in fluid communication with the flow-detecting orifice through a tube () and is operable to alert the wearer if the suction generated by the air flow through the passage falls below a predetermined value. |
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