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British Journal of Anaesthesia, 1974, Vol. 46, No. 4 302-310
© 1974 The Board of Management and Trustees of the British Journal of Anaesthesia

other

AN ELECTRONIC RESPIROMETER

L. A. COX, A. P. ALEMEIDA, J. S. ROBINSON and J. K. HORSLEY

An electronic respirometer is described. Because of the calibration procedure at a frequency of 20/min the instrument tends to give a small underestimate at frequencies of less than 20/min and an overestimate at frequencies greater than 20/min. If the instrument is used to measure respirable gas mixtures the accuracy is well within the limits claimed (±2%, ±1%, f.s.d with a variable flow) provided allowance is made for such artefactual errors as flow reversal. A greater accuracy was obtained with constant flow, provided allowance was made for a constant under-reading 1.45. l./min.


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