The results of investigations on the reliability of a commericially available test equipment for anaesthetic vaporizers based on the Rotameter principle (s.c. "Tekatest") are reported. In prototype devices scattered differences up to 27% between the results obtained by the Tekatest and those derived from gas chromatography and mass-spectrometry were noted; in a somewhat improved version an unidirectional error of about 24% became evident. Up to now, therefore, this test equipment cannot be recommended for recalibration of vaporizers in clinical use.
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