Breathing alcohol testing device

US4298010A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Wolfgang Eckstein · Sereetz, DE
• Horst Rabenecker · Stockelsdorf, DE

Key dates

• Filing date: Oct 30, 1979
• Grant date: Nov 3, 1981
• Expiry date: Oct 30, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N1/24
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A breathing alcohol testing device comprises a tube for blowing expiration air therethrough which has a first air entrance end and an opposite second end with means for accommodating a testing tube containing a gas detection substance. A pump is connected to the tube for moving expiration air through the tube and pressure sensing means are associated with the tube for sensing the pressure adjacent the entrance end for regulating the pump in accordance with the sensed pressure. In addition to the sensing of pressure, velocity may also be sensed and a control device is connected between the sensors and the pump so as to regulate the pump to start after the tube is engaged in a person's mouth and he begins expiring his breath into the tube and a certain pressure is generated at a certain velocity. The pump may be provided directly in the line ahead of the gas testing device for forcing the breathing air through the tube and through the testing device or it may be provided downstream of the testing device. When the pump is located downstream of the testing device the tube is provided with an additional socket having a valve regulation for admitting air into the tube in accordance with …