Nellcor N395
Nellcor · Model N395
Simple, intuitive operation and easy-to-see display Compatible with the complete family of OxiMax Pulse Oximetry Sensors. Ideal for any clinical environment - monitors neonates through adults. Convenient selection of adult or neonate alarm limits, and user-configurable power-on settings. Works with the Oxinet III Central Station and Paging System to provide an easy-to-use, cost-effective monitoring solution for the General Care Floor. Compatible with Nellcor’s Score Analysis Software for overnight oximetry studies. User-selectable fast-averaging mode (2-3 seconds) to more precisely track rapidly changing saturations. On-screen viewing of 48 hours of SpO 2 and pulse rate trends taken at 4-second intervals; printing capability. Variable pitch beep tone enables clinicians to hear changes in SpO 2. Interfaces with certain multiparameter monitors; real-time patient information and true physiologic waveforms are displayed on host system.
Key tips
- ·A no-signal/flatline alarm gets checked on the patient first, not the monitor - rule out a real clinical event before troubleshooting.
- ·Recalibrate NIBP against a reference manometer, not just a self-test pass.
- ·Reused patient cables (SpO2, ECG leads) are a common source of intermittent-fault complaints - swap the cable before the module.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
No SpO2 / pulse reading or poor signal
HighSymptoms: No saturation / pulse value, "pulse search", low signal-quality, implausible values.
Root cause: Worn or wrong SpO2 sensor, a damaged pulse-oximetry cable, poor site / perfusion, or motion.
Sensor / cable connector fault
MediumSymptoms: Reading drops when the cable is moved, sensor not recognised.
Root cause: Broken conductors in the sensor / DOC-10 cable or a worn connector.
Inaccurate SpO2 vs a co-oximeter
MediumSymptoms: SpO2 consistently biased vs an arterial reference.
Root cause: Sensor degradation, or a monitor calibration / module fault.
Alarm / audio fault
MediumSymptoms: No or quiet audible alarm.
Root cause: Speaker or audio-board fault - a safety-critical failure.
Battery / power fault
MediumSymptoms: Short battery run time, will not power on.
Root cause: Aged battery.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
SpO2 sensor (reusable / disposable)
Class Frequent wear itemRel. cost $$R&R Easy
Pulse-oximetry extension cable
Class Frequent wear itemRel. cost $$R&R Easy
Battery
Class Periodic replacementRel. cost $$R&R Fairly easy
Alarm speaker / audio board
Class Major service partRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| SpO2 sensor (reusable / disposable) | Frequent wear item | $$ | Easy |
| Pulse-oximetry extension cable | Frequent wear item | $$ | Easy |
| Battery | Periodic replacement | $$ | Fairly easy |
| Alarm speaker / audio board | Major service part | $$ | Moderate |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Routine cable and lead-wire inspection for fraying/wear
- ·Battery conditioning cycle
- ·NIBP calibration check against a reference manometer
- ·ECG / SpO2 accuracy verification against a patient simulator
- ·Annual electrical safety test
Error Codes
Extracted directly from this unit's own service manual.
1Failure of Power-On Self-Test (POST)
Replace User Interface PCB
4Battery dead
1. Charge battery for 14 hours 2. Leads of battery reversed; see paragraph 6.6. 3. Replace battery
5Too many microprocessor resets within a period of time
1. Cycle power 2. Replace User Interface PCB if code 5 repeatedly occurs 3. Replace Power Supply
6Boot CRC error
1. Cycle power 2. Replace User Interface PCB
8Boot CRC Error Flash ROM corruption Excessive resets
1. Cycle power 2. Replace User Interface PCB if code repeatedly occurs
11Boot CRC Error Flash ROM corruption Excessive resets
1. Cycle power 2. Replace User Interface PCB if code repeatedly occurs
12Boot CRC Error Flash ROM corruption Excessive resets
1. Cycle power 2. Replace User Interface PCB if code repeatedly occurs
52Loss of settings
1. Cycle power 2. Check and reset settings if necessary 3. Check battery 4. Replace User Interface PCB if code repeatedly occurs
76Error accessing EPROM
1. Cycle power 2. Replace User Interface PCB
81Settings lost (settings that were different from power-on default values have been lost)
1. Cycle power 2. Check and reset settings if necessary 3. Check battery 4. Replace User Interface PCB if code repeatedly occurs
82Time clock lost
1. Reset time clock 2. Battery power was lost; check the battery 3. Replace the Power Supply
84Internal communications error
1. Cycle power 2. Replace User Interface PCB if code repeatedly occurs
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: No SpO2 / poor signal
- Fit a fresh, correct-size sensor on a well-perfused, still site.
- Swap the extension cable.
- Confirm the signal-quality / pleth indicator improves.
- Test the monitor with an SpO2 simulator.
- Replace the sensor / cable or refer the monitor if the simulator also fails.
Symptom: Accuracy / alarm concern
- Compare SpO2 to a co-oximeter blood gas where clinically indicated.
- Try a known-good sensor.
- Verify against an SpO2 simulator at several saturations.
- Test the audible alarm at the set volume.
- Refer for module / audio service if it fails the simulator or alarm test.
Technical Specs
- Height
- 3.3 in
- Length
- 6.8 in
- Pulse Rate Range
- 20-250 BPM
- Weight
- 5.7 lbs
- SpO2 Range
- 1-100%
- Width
- 10.4 in
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- ICU / CCU
- Emergency Department
- OR / PACU
- General med-surg floors
- Step-down units
- Telemetry units
Documents & Manuals
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