Welch Allyn CP 150 spirometry option - User Manual - Manual (Page 29)

CAUTION Several things may affect calibration results:
movement of the syringe, movement of the pressure tubing,
or blockage of air. Place the syringe on a hard, level surface
with at least 1 cubic meter of open air surrounding the flow
transducer. Place your hand on top of the syringe to prevent
movement.
8. Touch the Start button to begin the calibration.
9. When the black bar begins to move, push the plunger all the way in, then pull it all
the way out, carefully following the black bar’s rate. Use a steady motion in both
directions for 2 more times. Touch the Start button to begin each calibration.
When no air has moved for three seconds, the multiple flows results display.
10. Review the results.
Note Check the error percentages for the expired and inspired
volumes. The 0.5,1.0, and 3.0 L/s expired and inspired
volumes must be less than ±3.5% for the calibration to be
acceptable.
Note The syringe used to check the volume calibration of
spirometers must have an accuracy of 15 mL for a 3-L
syringe.
11. Touch the Accept button to save the calibration results.
Directions for use About calibration 25