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What This Guide Helps With
Troubleshoots missing or failed proximal sensor detection and calibration caused by connections, contamination, tubing, sensor condition, configuration, or service-level faults.
Step-by-Step Troubleshooting
1. Protect the Patient and Establish Alternate Ventilation
Do not troubleshoot an unreliable flow or pressure monitoring system while a patient depends on it. Move the patient to another verified ventilator or provide an appropriate backup method.
Expected outcome: Patient ventilation and monitoring continue independently of the affected Servo-n.
2. Confirm the Exact Sensor Problem
Determine whether the proximal sensor:
- Is not detected
- Is detected but will not calibrate
- Produces intermittent recognition
- Fails only with a particular circuit or sensor
Repeat the approved setup or pre-use verification away from the patient.
Expected outcome: The failure is reproducible and clearly defined.
3. Inspect the Sensor and Patient-Circuit Placement
Verify the proximal sensor is the correct compatible device and is installed in the proper orientation and location.
Inspect for:
- Cracks
- Contamination
- Condensate
- Secretion buildup
- Damaged connector pins or contacts
- Loose fittings
Expected outcome: The sensor is correctly positioned, clean as required, and externally undamaged.
4. Inspect Sensor Tubing and Electrical Connections
If the setup uses external sensing lines or electrical connections, inspect them end-to-end.
Look for:
- Kinks
- Pinching
- Liquid
- Disconnections
- Reversed lines
- Loose connectors
- Damaged cables
Reseat accessible connections.
Expected outcome: All external connections are intact, correctly routed, and secure. If detection returns after correcting a loose connection, troubleshooting can stop after successful calibration and verification.
5. Eliminate Moisture or Circuit Problems
Inspect the circuit for excessive condensation or water that could interfere with pressure or flow measurement.
Correct water accumulation and circuit positioning using approved clinical procedures.
Expected outcome: The sensing path is dry enough for reliable measurement and free of obstruction.
6. Try a Known-Good Compatible Sensor or Cable
Substitute a known-good approved proximal sensor and, when separately replaceable, its associated external cable or tubing.
Change one component at a time so the failed item can be identified.
Expected outcome: If the replacement sensor calibrates successfully, the original sensor or accessory should be removed from service. Troubleshooting can stop after repeat verification.
7. Verify Configuration and Test Conditions
Confirm the selected ventilation setup and sensor configuration match the connected hardware.
Do not alter unauthorized service settings merely to clear the fault.
Expected outcome: The installed hardware and normal operating configuration agree.
8. Complete Calibration and Functional Verification
Perform the appropriate approved calibration or pre-use verification under the correct test conditions.
Verify that proximal flow and pressure measurements appear plausible and remain stable.
Expected outcome: The sensor is detected, calibration completes successfully, and readings remain reliable. Troubleshooting can stop.
If the Problem Persists
External sensor, tubing, cable, positioning, and configuration causes have been ruled out. The remaining fault may involve the sensor interface, measurement circuitry, pneumatic sensing path, connector hardware, or another service-level condition.
The Servo-n should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated with appropriate Getinge documentation and approved test equipment
- Repaired or configured only by qualified personnel
Do not rely on an intermittently detected or uncalibrated sensor. Complete required calibration and ventilator performance testing before return to service.
Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
Proximal sensor faults can affect both displayed values and clinical decisions; maintain ventilation and monitoring with a verified alternate system during troubleshooting.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported that the Servo-n would not detect or calibrate the proximal flow sensor during setup."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found moisture in the external sensing connection and no damage to the sensor or ventilator connector."
Resolution
What action was taken.
Example:
"The affected connection was dried and correctly reassembled, calibration and pre-use verification passed, and the ventilator was returned to service."
Helpful Details to Include (If Known)
- Sensor type
- Exact detection or calibration message
- Circuit configuration
- Sensor orientation
- Moisture or contamination observed
- Tubing and cable condition
- Known-good substitution results
- Calibration result
- Final device status
Final Thought
Maintain patient support first, then verify the sensor, connections, sensing path, and configuration before assuming an internal fault. A sensor that cannot be reliably detected and calibrated requires escalation and clear CCR documentation.
That is successful troubleshooting.