Masimo ISA Capnography
Masimo · Model ISA Capnography
Nomoline™–No moisture sampling lines and non-proprietary cannulas Reduces disposable costs through: Extended monitoring time in low- and high-humidity environments Use of non-proprietary cannulas Innovative design eliminates the need for a water trap Patented design allows water in the sampling line to evaporate into the surrounding air, while leaving oxygen, carbon dioxide, and anesthetic gases unaffected Hydrophobic liquid and bacteria filter protects the ISA module from bacteria and water intrusion to maintain continuous performance.
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.
EtCO2 reading drift / needs zero
HighSymptoms: EtCO2 offset, slow response, or a zero-required prompt.
Root cause: Sample cell / airway adapter contamination, or IR bench drift.
No CO2 waveform
MediumSymptoms: Flat trace, occlusion or "check adapter" message.
Root cause: Blocked / kinked sample line, a full Nomoline water trap, or a sample-pump fault.
Module not recognised by the host
MediumSymptoms: Host monitor does not display the ISA module.
Root cause: Docking / cable connector fault.
Adapter / sampling-line supply issue
LowSymptoms: Repeated occlusion or contamination flags.
Root cause: Reused single-patient adapter / Nomoline, or wrong adapter type.
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.
Nomoline sampling line / water trap
Class ConsumableRel. cost $R&R Easy
ISA analyser module
Class Major service partRel. cost $$$R&R Fairly easy
Internal sample pump
Class Periodic replacementRel. cost $$$R&R Difficult
Mainstream airway adapter
Class ConsumableRel. cost $R&R Easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Nomoline sampling line / water trap | Consumable | $ | Easy |
| ISA analyser module | Major service part | $$$ | Fairly easy |
| Internal sample pump | Periodic replacement | $$$ | Difficult |
| Mainstream airway adapter | Consumable | $ | Easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
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: EtCO2 value looks wrong
- Fit a fresh airway adapter / Nomoline sampling line and clear any moisture.
- Allow the bench to warm up and perform a zero in room air.
- Confirm the sample pump runs and the water trap is not full.
- Verify against a reference CO2 concentration if available.
- Return to use only after a clean capnogram.
Symptom: No waveform
- Replace the Nomoline sampling line and water trap.
- Check the adapter / line for a kink or blockage.
- Confirm the internal sample pump runs.
- Reseat the module at the host and check the connector.
- Confirm a normal capnogram.