Puritan Bennett 590
Puritan Bennett · Model 590
Puritan Bennett 590 Oxygen Concentrator The takes normal room air and, using a series of sieves, filters, and a compressor, removes the Nitrogen from the air, thereby increasing the oxygen content of the resulting air to up to 96%. They are used by patients with chronic respiratory ailments. The resulting concentrated oxygen is then delivered via an output tube from the unit to either an oxygen mask, tracheotomy mask or connector, or to a nasal cannula.
Key tips
- ·Don't extend filter/tubing replacement intervals to save cost - this is an infection-control issue, not just a performance one.
- ·Flow accuracy drift is often the earliest sign of a failing sensor, well before an outright alarm.
Typical Failure Modes
Failure patterns typical of this equipment class - general BMET reference, not verified against this exact unit's own service history unless flagged. Severity is a category-level estimate.
Oxygen concentrator sieve bed wear
HighSymptoms: Low O2 purity, alarm.
Root cause: Zeolite sieve exhaustion.
Compressor fault
HighSymptoms: Low flow, overheat.
Root cause: Worn compressor.
Suction pump failure
MediumSymptoms: Low vacuum, no suction.
Root cause: Diaphragm/motor wear.
Humidifier element fault
LowSymptoms: No humidity, overheat.
Root cause: Heater plate failure.
Serviceable Parts & Consumables
The parts a BMET typically services on this class of equipment. Service class and relative cost are general engineering estimates for the category, not figures from this unit's documentation. Part numbers appear only when pulled from this unit's own service manual. Always confirm intervals and pricing against the manufacturer.
Humidifier heating plate
Class Periodic replacementRel. cost $$R&R Fairly easy
Sieve bed (zeolite)
Common R&R on concentrators.
Class Periodic replacementRel. cost $$$R&R Moderate
Compressor
Class Periodic replacementRel. cost $$$R&R Difficult
Suction diaphragm / pump
Class Periodic replacementRel. cost $$R&R Moderate
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Humidifier heating plate | Periodic replacement | $$ | Fairly easy |
| Sieve bed (zeolite) Common R&R on concentrators. | Periodic replacement | $$$ | Moderate |
| Compressor | Periodic replacement | $$$ | Difficult |
| Suction diaphragm / pump | Periodic replacement | $$ | 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.
- ·Filter and tubing replacement
- ·Flow accuracy check
- ·Annual full PM
Troubleshooting Approach
A structured starting point derived from the failure modes above. Follow the manufacturer's service documentation for the actual procedure.
Symptom: Oxygen concentrator sieve bed wear
- Confirm the presentation - typically low O2 purity, alarm - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: zeolite sieve exhaustion.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the sieve bed (zeolite) per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Symptom: Compressor fault
- Confirm the presentation - typically low flow, overheat - and note the exact alarm or message and the conditions when it occurs.
- Check the most likely cause first: worn compressor.
- Isolate the affected subsystem using the manufacturer's functional check or self-test, where one is provided.
- If the fault is confirmed and not a field adjustment, service or replace the compressor per the manufacturer's service documentation.
- Return the device to service only after the manufacturer's functional and applicable electrical-safety checks pass.
- Record the findings, any parts used, and the verification results in the maintenance history.
Technical Specs
- Height
- 25.4 in
- Length
- 16.5 in
- Weight
- 59 lbs
- Width
- 12.5 in
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Respiratory Therapy department
- Patient floors
- Emergency Department
- Home care (portable units)
Documents & Manuals
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