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What This Guide Helps With
Troubleshoot visible air, loose connections, depleted fluid sources, disposable positioning, and priming problems before suspecting an air-detection system failure.
Step-by-Step Troubleshooting
1. Protect the Patient and Stop Unreliable Delivery
Do not continue rapid infusion when the device reports air or when visible air remains in the patient fluid path.
Transfer therapy to another verified method as clinically appropriate before troubleshooting.
Expected outcome: The patient is protected from an unreliable or air-containing infusion pathway.
2. Confirm the Alarm Condition
Record the exact displayed alarm or message and determine whether:
- Air is visibly present
- The alarm occurs during priming
- The alarm occurs during active flow
- The alarm repeats with an apparently air-free set
Do not dismiss repeated air alarms without verification.
Expected outcome: The problem is identified as true visible air, incomplete priming, or possible false detection.
3. Inspect the Fluid Source
Verify that the source container contains sufficient fluid and that its outlet remains immersed or otherwise positioned to prevent air entry.
Check for an emptied bag, loose spike, loose connector, or source change that may have introduced air.
Expected outcome: A continuous fluid supply is available without an obvious route for air entry.
4. Inspect All External Fluid Connections
Trace the disposable pathway from the fluid source through the reservoir and toward the patient-line connection.
Look for:
- Loose connections
- Partially seated fittings
- Cracked components
- Improperly closed ports
- Disconnected tubing
- Visible air accumulation
Expected outcome: All external connections are secure and no obvious source of air ingress remains.
5. Check Disposable Positioning
Verify that the disposable is loaded correctly and that tubing passing through air-detection areas is fully seated, straight, and free of twists, folds, contamination, or deformation.
Do not place foreign material between tubing and accessible detection surfaces.
Expected outcome: Tubing is correctly positioned at all accessible detection points.
6. Reprime the Disposable Path
With the unit removed from patient use, perform the normal accessible priming process using an appropriate test fluid.
Observe whether visible air moves out of the disposable pathway and whether fluid completely occupies the intended path.
Expected outcome: Visible air clears and the air alarm resets. If the alarm does not return during functional testing, troubleshooting can stop.
7. Replace a Suspect Disposable
If air repeatedly collects despite secure connections and an adequate fluid source, replace the disposable with a known-good compatible set.
Inspect the removed set for leakage, loose bonding, distorted tubing, or other visible defects.
Expected outcome: A known-good disposable primes without persistent air accumulation or false alarms.
8. Compare Alarm Behavior With a Controlled Bench Setup
Using an appropriate nonpatient test setup, operate the device with a known-good disposable and controlled fluid source.
Observe whether an air alarm occurs when the visible fluid path is completely primed.
Expected outcome: No air alarm occurs with a correctly primed known-good setup. If normal operation is restored, the external disposable or setup was the likely cause.
9. Perform Final Functional Verification
Verify that:
- The fluid path remains visibly free of air
- The alarm does not recur unexpectedly
- Fluid delivery remains stable
- Audible and visual alarm indications remain functional
Do not return the device to service if air detection is intermittent or unreliable.
Expected outcome: The RI-2 operates normally with a fully primed path and stable alarm behavior.
10. Escalate Repeated False Air Detection
If the device repeatedly reports air with a correctly installed, visibly air-free known-good disposable, remove it from service.
Do not bypass, obstruct, disable, or alter the air-detection system.
Expected outcome: A potentially unreliable air-detection system is prevented from returning to clinical use until evaluated.
If the Problem Persists
External sources of air, fluid depletion, loose connections, disposable defects, tubing positioning, and incomplete priming have been ruled out.
The remaining cause may involve an internal air-detection sensor, associated electronics, mechanical positioning, or another service-level fault.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
Return-to-service testing must verify reliable air detection and normal fluid delivery.
Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
A repeated air alarm should never be treated as nuisance behavior until the entire accessible fluid path has been verified air-free.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported repeated air detector alarms during setup of the RI-2."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a loose external disposable connection allowing air to enter the fluid path."
Resolution
What action was taken.
Example:
"The connection was corrected, the disposable was reprimed, and the unit operated without recurring air alarms during functional testing."
Helpful Details to Include (If Known)
- Exact air alarm message
- Whether air was visible
- Fluid-source level
- Connection condition
- Disposable condition
- Tubing position at detector areas
- Known-good disposable result
- Whether alarm occurred during prime or flow
- Alarm behavior after correction
- Final device status
Final Thought
Air alarms demand patient-safety priority. Confirm the fluid source, connections, disposable, and priming before suspecting an internal detector problem, then verify reliable operation before return to service.
That is successful troubleshooting.