Calibration device for use in calibrating a sensor

US5293770A · kind A · utility

Assignee

• Radiometer A/S · DK

Inventors

• Steffen Hansen · Copenhagen, DK
• Poul Ravn Sorensen · Copenhagen, DK

Key dates

• Filing date: Dec 21, 1990
• Grant date: Mar 15, 1994
• Expiry date: Dec 21, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T436/10
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In one embodiment the calibration device (1) comprises a housing (2) which by means of a removable lid (8) and a rupturable barrier layer (3) is divided into a calibration chamber (4) and a second chamber (10). The calibration chamber (4) contains a calibration fluid (5)--e.g. a dry gas--while second chamber (10) contains a second fluid (11)--e.g. a wetting agent. Immediately prior to a calibration process the lid (8) is removed, whereafter a sensor with its measuring surface in front is inserted through the second chamber (10) into the housing (2) until it abuts against a shoulder (6) in the housing (2). This causes the barrier layer (3) to rupture and the second fluid (11) to contact the calibration fluid (5). Hereafter the calibration process can take place. In another embodiment the device (1) further comprises a membrane (12) which is accommodated in the second chamber (10) and is adapted to be secured to the sensor during the insertion of the sensor into the housing (2). The disclosed device--which is particularly suited for use in calibrating sensors for transcutaneous registering of the contents of CO.sub.2 and/or O.sub.2 in blood--is self-contained, and can be made in a ve…