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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting situations where the Life Scope G Series monitor reports SpO₂ reading errors. Symptoms may include no reading, intermittent values, fluctuating SpO₂ levels, or alarm messages indicating “SpO₂ sensor error” or “signal weak.” Most issues are related to external factors such as probe placement, connection integrity, or patient-related artifacts, before considering internal device failure.
Step-by-Step Troubleshooting
Check the SpO₂ probe connection
- Ensure the probe is fully inserted into the correct port.
- Inspect for bent or damaged pins.
- Poor connection can prevent the device from reading signals accurately.
Inspect the probe for damage
- Look for frayed wires, cracks, or discoloration on the sensor.
- A damaged probe can give erroneous readings or fail entirely.
Verify proper placement on the patient
- Ensure the sensor is correctly positioned (finger, earlobe, or neonatal site as applicable).
- Remove nail polish or obstructions that can interfere with light transmission.
- Confirm the site is warm and perfused; cold or poor circulation can cause unstable readings.
Check for patient movement or external interference
- Ask the patient to remain still if possible.
- Ensure the probe cable is not rubbing against bed rails or other equipment, which can create artifacts.
Swap with a known good probe
- If available, connect a functional, compatible SpO₂ probe to verify if the reading normalizes.
- Confirms whether the issue is probe-related versus device-related.
Verify monitor settings
- Check alarm limits, averaging times, and signal quality indicators.
- Incorrect settings may trigger false alarms or unstable readings.
Power cycle the monitor
- Turn the monitor off, wait 30 seconds, and restart.
- Resets the sensor detection circuitry and clears transient errors.
If the Problem Persists
Common external causes have been ruled out.
The device may have an internal sensor board or port issue.
- Remove the monitor from service.
- Label as Out of Service.
- Send to the biomedical bench for evaluation or repair.
Knowing when to escalate prevents unnecessary troubleshooting and maintains patient safety.
Clinical Use Tip
Do not troubleshoot on an active patient if SpO₂ readings are critical.
Move the patient to another functioning monitor before performing any probe or device checks.
Ensure continuous patient monitoring throughout troubleshooting.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Monitor intermittently displays SpO₂ errors and fails to provide a reading.”
Cause
What was observed during troubleshooting.
Example:
“Probe connector loose and sensor slightly damaged; site was cold and patient moving.”
Resolution
What action was taken.
Example:
“Repositioned probe, confirmed connection, replaced with functional sensor, monitored readings stabilized. If errors persist, device sent to bench.”
Helpful Details to Include
- Probe type and model
- Indicator light behavior (e.g., blinking, solid)
- Alarm message wording
- Cable and connector condition
- Patient site used
- Device response after swapping probe or power cycling
Final Thought
Logical, stepwise troubleshooting ensures patient safety and avoids unnecessary internal device intervention. Proper documentation of findings and actions is essential for continuity of care and compliance with Clinical Engineering standards. Escalating when external checks fail maintains reliability and reduces downtime.
That is successful troubleshooting.