On this page
Asset Type
Manufacturer
Model
What This Guide Helps With
This guide assists in troubleshooting flow sensor calibration errors on a CareFusion AVEA. Errors can prevent accurate tidal volume and flow measurements.
Step-by-Step Troubleshooting
Verify Power and Startup
- Ensure the ventilator is plugged into a verified power source and turned on properly.
- Check that all system self-tests pass at startup.
- Why: Flow sensor calibration cannot proceed if the device experiences startup errors or unstable power.
Check Breathing Circuit Setup
- Confirm all patient circuit components are correctly installed: inspiratory/expiratory limbs, humidifier, filters, and connectors.
- Ensure there are no kinks, leaks, or obstructions.
- Why: Misconnected circuits or leaks can prevent proper flow measurement and calibration.
Inspect the Flow Sensor Module
- Verify the flow sensor is seated correctly in the module port.
- Look for visible damage, moisture, or condensation inside the sensor.
- Swap with a known-good flow sensor if available.
- Why: External damage or poor connection is a common cause of calibration errors.
Check Environmental Factors
- Ensure ambient temperature and humidity are within ventilator specifications.
- Remove any excessive moisture, condensation, or aerosol buildup near the sensor.
- Why: Flow sensors rely on precise measurements; extreme conditions can affect readings.
Run Flow Sensor Calibration
- Initiate the ventilator’s calibration routine following CareFusion AVEA prompts.
- Observe any error codes or alarms during calibration.
- Why: Properly running the calibration routine can identify whether the error is persistent or intermittent.
Inspect for Software or Configuration Issues
- Verify ventilator software is up to date.
- Confirm patient mode and circuit settings match the sensor type.
- Why: Incorrect configuration can prevent successful calibration.
If the Problem Persists
After completing external checks, if calibration errors continue:
- Remove the ventilator from service.
- Label as Out of Service.
- Send for manufacturer repair or bench evaluation.
- Why: Continuing to attempt calibration on a potentially defective sensor may risk inaccurate patient ventilation. Knowing when to escalate is proper troubleshooting.
Clinical Use Tip
Never attempt flow sensor troubleshooting while the patient is connected. Move the patient to another functioning ventilator first. Perform sensor checks only when safe and the circuit is disconnected from the patient.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Ventilator displays flow sensor calibration error during pre-use check."
Cause
What was observed during troubleshooting.
Example:
"Flow sensor misaligned, moisture present, or circuit setup error."
Resolution
What action was taken.
Example:
"Verified circuit and sensor, replaced with known-good sensor, recalibrated successfully. If unsuccessful, ventilator removed from service and sent for repair."
Helpful Details to Include (If Known)
- Sensor module inspected for moisture/damage
- Circuit reconnected and verified
- Calibration attempt results (pass/fail)
- Alarm behavior noted
- Ventilator software version
- Final status (operational or out of service)
Final Thought
Patient safety is the priority: always verify setup and move patients before troubleshooting. Start with simple external checks and escalate when needed. Document all observations and interventions using the CCR method to ensure accurate records for maintenance and safety.
That is successful troubleshooting.