Perry Baromedical Sigma Elite
Perry Baromedical · Model Sigma Elite
Electronically controlled The operator control panel is the interface to the electronic controller The chamber touch screen allows creation and selection of patients, treatments and reports Treatments can be run manually or automatically by selecting newly created or stored profiles Automated treatments include the full pressure profile and air break locations to remind the patient to apply and remove the air mask Profiles can include non-linear curves to avoid ear trauma, contain multiple dwell pressures and even include multiple air break locations.
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.
Chamber will not pressurize or compresses slowly
HighSymptoms: Slow or no rise to treatment pressure, long equalization.
Root cause: Low supply pressure, an inlet / compression valve fault, or a control fault.
O2 level not reaching target
HighSymptoms: Chamber O2 below target at the expected time, flush / purge not performing.
Root cause: Flow / purge-rate fault, O2 sensor drift, or a supply issue.
Control / monitor alarm or safe-state activation
MediumSymptoms: Controller alerts an abnormal condition and forces a safe state.
Root cause: An electronic or pneumatic subsystem fault detected by the chamber monitoring.
Acrylic hull crazing or door-seal leak
HighSymptoms: Fine cracks in the acrylic cylinder, pressure will not hold, hiss at the hatch.
Root cause: Acrylic aging / crazing (retirement item) or a worn door O-ring seal.
Excess noise at the pressure plateau
LowSymptoms: Loud airflow noise during the plateau, patient discomfort.
Root cause: Muffler / silencer degraded or a valve issue.
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.
Acrylic cylinder (hull)
Inspect for crazing and retire per the manufacturer's schedule.
Class Major service partRel. cost $$$$R&R Expert-level
Door / hatch O-ring seal
Class Periodic replacementRel. cost $$R&R Moderate
O2 sensor
Class Frequent wear itemRel. cost $$R&R Fairly easy
Inlet / exhaust / compression valves
Class Major service partRel. cost $$$R&R Difficult
Controller / monitor board
Class Major service partRel. cost $$$$R&R Difficult
Muffler / silencer
Class Major service partRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Acrylic cylinder (hull) Inspect for crazing and retire per the manufacturer's schedule. | Major service part | $$$$ | Expert-level |
| Door / hatch O-ring seal | Periodic replacement | $$ | Moderate |
| O2 sensor | Frequent wear item | $$ | Fairly easy |
| Inlet / exhaust / compression valves | Major service part | $$$ | Difficult |
| Controller / monitor board | Major service part | $$$$ | Difficult |
| Muffler / silencer | Major service part | $$ | Moderate |
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: Chamber will not pressurize
- Confirm the O2 / air supply pressure is within spec.
- Check the inlet and compression valves operate.
- Inspect the door O-ring seal for leakage.
- Review the controller log for the recorded fault.
- Escalate a confirmed valve or controller fault to the manufacturer; do not treat until verified.
Symptom: O2 level not reaching target
- Verify the flush / purge rate and flow settings.
- Calibrate or replace the O2 sensor.
- Confirm the O2 supply.
- Check for leaks at the hatch and pass-throughs.
- Re-verify the O2 rise-time on an unoccupied run.