CP 150 spirometry option symptoms and solutions
Problem-solving suggestions:
If you try these suggestions and still have problems, contact Welch Allyn.
Note Your model might not contain this feature.
Symptom Possible cause Suggested action
Unable to calibrate Poor connection between flow
transducer and sensor
Check the connection between flow
transducer and sensor.
Damage to flow transducer Replace the flow transducer if it is
damaged.
Leak during calibration. Ensure that the connection between
the calibration syringe and flow
transducer is tight with no leaks.
Uneven calibration strokes. Use even strokes in calibration.
Pressure tubing is kinked Replace pressure tubing.
Calibration fails consistently. Unable to
achieve a ± 3% error percentage
margin
(with confirmed good syringe and
tubing and correct calibration
techniques).
Altitude and atmospheric pressure
beyond tolerance causes the
calibration reading to be above the 3%
error margin.
After a failed calibration, touch
Accept even though the calibration
result is above the 3% error margin.
Accepting the calibration result will
adjust the gain value closer to the
correct atmospheric pressure. Perform
the calibration again.
No sensor detected Poor connection between the sensor
and the device
Connect to another USB port.
Replace the USB cable.
Does not print Out of paper Load paper. See the CP 150
electrocardiograph manual, entitled CP
150 12-lead resting electrocardiograph
Directions for use .
Paper jam If the paper is jammed, clear it, then
reload.
Values are too high (intermittent) Patient’s fingers obstructed the screen
on the back of the flow transducer,
causing high back pressure and false
reading
Retest.
Patient’s lips were not tightly sealed
around the flow transducer
Retest.
Spirometer was calibrated with the
wrong size syringe
Recalibrate with a 3-liter syringe. See
Perform a calibration in the spirometry
manual entitled CP 150 spirometry
option, Directions for use (English-
only).
Service manual Troubleshooting 67
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