Calibration of portable respiratory gas meters.
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, National Center for Urban and Industrial Health, Occupational Health Progam, RR-8, 1968 Feb; :1-9
Direct calibration of portable respiratory gas meters (based on expired gases) is possible by placing the meter in a box in series with an instrument of known accuracy. The Muller-Franz meter calibrated in this study had an indicated spread of acceptability of about 35 liter per minute in the range of 25-60 liter per minute. Outside of this range, because of inertia below and resistance above, the meter was grossly in error. The desirability of direct calibration is evident from the fact that the flow rate of a single breath, in liters per minute, exceeds the observed minute volume.
NIOSH-Author; Respiratory-gas-analysis; Respiratory-function-tests; Test-methods; Measurement
Occupational Health Progam