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Asset Type
Manufacturer
Model
Models Covered
525DS, 525DS-Q, 525KS, 525KS-LT, and 525PS.
Manual Reference
Drive DeVilbiss Healthcare 5-Liter Oxygen Concentrator Service Manual LT-2023 and applicable 525 Series Instruction Guide A-525DS/SE-525K4.
Manufacturer Recommendation / AEM Status
- Weekly: Clean the outer cabinet. For models with a cabinet/gross-particle filter, clean the filter and oxygen outlet connector. Clean filter-door vents.
- Each inspection/service: Wash or replace the cabinet filter when fitted, clean filter-door vents, and verify the audible alert and indicators.
- Each PM, not to exceed three years: Verify oxygen concentration with a calibrated analyzer and inspect/replace intake bacteria filter MC44D-605 as necessary.
- Each PM or between patients: Inspect the power cord, switch, and circuit breaker; replace damaged/worn components.
- Between patients: Replace non-reusable patient accessories, complete manufacturer-listed cleaning/disinfection, replace the cabinet filter when fitted, inspect components, and verify oxygen concentration. Do not use for another patient if complete reprocessing by a trained person cannot be performed.
- During compressor service: Inspect/replace final bacteria filter PV5LD-651 and the applicable compressor filter. The newer sintered-bronze compressor filter is 525DD-626.
The schedule assumes approximately 5,000 operating hours per year in a normal, clean environment. The provider determines and documents an appropriate interval for actual conditions. Changes to manufacturer-listed activities or intervals belong under the facility's approved AEM program, risk assessment, maintenance history, operating environment, and applicable regulatory requirements.
What This PM Procedure Covers
- Identity, hours, configuration, environment, and history
- Cabinet, casters, vents, filters, outlet, flowmeter, cord, switch, breaker, labels, and accessories
- Weekly, between-patient, and provider maintenance
- Startup, power-failure, and low-flow alarms
- Flow, outlet pressure, and model-specific oxygen concentration
- Qualified internal/compressor service when due and Class II safety
Required Tools and Equipment
- Current 525 Series service and instruction manuals
- Calibrated oxygen analyzer; manual-listed Max O2 analyzer R217P62 or approved equivalent
- Calibrated oxygen flow analyzer capable of 0.5-5 LPM
- Calibrated pressure gauge and compatible adapter; manual-listed assemblies 303DZ-637 and 525DD-637
- Timer for the 20-minute stabilization period
- Correct filters for the serial/configuration: 303DZ-605, MC44D-605, PV5LD-651, and applicable compressor filter
- Manufacturer-approved cleaning/disinfection supplies, lint-free cloths, PPE, and authorized service tools
- Electrical safety analyzer suitable for Class II medical equipment when facility-required
Step-by-Step PM Procedure
1. Verify Identification and Configuration
Action: Record asset tag, serial, catalog model, rating, hours, auxiliary-port configuration, filters, accessories, location, and environment. Confirm applicable documentation and parts.
Expected outcome: CMMS identity and model-specific requirements are correct.
2. Review History and Environment
Action: Review purity, alarm, flow, pressure, heat, vibration/noise, power, filter, compressor, and prior-result history. Note excessive dust, lint, heat, humidity, or heavy usage.
Expected outcome: Conditions requiring corrective work or a shorter interval are identified.
3. Prepare Safely
Action: Provide alternate prescribed oxygen before removing an in-use unit. Switch off, unplug, remove accessories, and use a ventilated test area free of smoking, flame, sparks, oil, grease, and oxygen-enriched materials.
Expected outcome: Patient support is maintained and fire/electrical hazards are controlled.
4. Inspect Exterior and Mobility
Action: Inspect cabinet, handle, casters, filter door, vents, exhaust, outlet, flowmeter/knob, auxiliary port/cap, labels, hour meter, and fasteners for damage, blockage, contamination, looseness, liquid, or heat.
Expected outcome: The unit is intact, stable, unobstructed, and correctly labeled.
5. Inspect Power Components
Action: Inspect the cord, plug or rear IEC connection, polarization, insulation, strain relief, switch, circuit breaker, fuse holder when fitted, and indicators.
Expected outcome: Power components and controls are undamaged and safe.
6. Complete Due Cleaning and Reprocessing
Action: Clean the cabinet and vents by the instruction guide. Do not spray, saturate, allow liquid into openings, use petroleum solvents, or apply oil/grease. For patient change, qualified personnel shall replace listed non-reusable accessories and perform the complete manufacturer cleaning/disinfection, contact-time, residue-removal, drying, inspection, and purity-verification process.
Expected outcome: The unit is clean, dry, and fully reprocessed when applicable.
7. Inspect External Filters
Action: Determine whether cabinet filter 303DZ-605 is fitted; units manufactured since October 2020 may not have one. Inspect at every PM. Wash with warm water/dishwashing detergent, rinse, dry completely, and reinstall, or replace if damaged. Never operate without a required filter or with it damp. Clean filter-door vents.
Expected outcome: Required filtration is clean, dry, intact, and correctly installed.
8. Inspect Intake Bacteria Filter
Action: Inspect intake bacteria filter MC44D-605 during every PM and replace as necessary using the service procedure.
Expected outcome: The intake filter and filter door are serviceable and restored.
9. Complete Qualified Internal/Compressor Inspection When Due
Action: Qualified personnel only: unplug before cabinet removal. Inspect dust, tubing, wiring, abrasion, heat, corrosion, leaks, mounts, compressor, and rotary-valve area. During compressor service inspect/replace final bacteria filter PV5LD-651 and the applicable compressor filter. Install the final filter with its IN fitting toward the flowmeter. Restore the complete cabinet before power.
Expected outcome: Internal components are clean, secure, correctly filtered, and enclosed.
10. Verify Startup Alert and Indicators
Action: Connect rated mains and switch on. Confirm Service Required, Low Oxygen, and Normal Oxygen indicators illuminate briefly and the audible alert sounds. Allow up to 15 minutes for Normal Oxygen indication.
Expected outcome: Startup self-check passes and Normal Oxygen replaces the startup indication.
11. Verify Power-Failure Alarm
Action: With the unit operating, unplug it by the manufacturer method. Confirm the audible power-failure alert, then reconnect and restore operation.
Expected outcome: Mains loss produces an audible alert.
12. Verify Flow and Low-Flow Alarm
Action: Exercise the flow control through the intended 0.5-5 LPM range and compare selected points with a calibrated flow analyzer. Confirm 5 LPM maximum. After several minutes of operation, use the service-manual method to set flow to zero and confirm the red Service Required light and audible alarm. Restore flow immediately.
Expected outcome: Flow control and maximum delivery pass the approved criterion, and low-flow alarm activates.
13. Verify Oxygen Concentration
Action: Calibrate the analyzer under conditions similar to the concentrator location. Set 5 LPM, connect at the outlet, run at least 20 minutes, and record concentration. Apply the exact model limit: 525DS/525DS-Q: 87-96%; 525KS/525KS-LT/525PS: 93% ±3%.
Expected outcome: Stabilized concentration meets the exact model specification; a green OSD light alone is not a substitute for measurement.
14. Verify Outlet Pressure
Action: Using the calibrated pressure assembly and service-manual setup, measure and record outlet pressure. Do not improvise an outlet obstruction.
Expected outcome: Outlet pressure is 8.5 ±0.5 psig (58.6 ±3.5 kPa).
15. Evaluate Additional Alarm Tests When Required
Action: Routine PM documents startup, power-failure, low-flow, and oxygen-status behavior. Perform service-level overheating or compressor-failure alarm tests only when specifically required and only by the exact qualified procedure; both deliberately simulate faults.
Expected outcome: Required alarm tests pass and no protective function remains disconnected.
16. Perform Electrical Safety Testing
Action: Verify the label. LT-2023 identifies the 525 Series as Class II, double-insulated, so protective-earth resistance is normally not applicable. Perform facility-required Class II touch/enclosure leakage, polarity, and cord tests. Do not impose a grounded-device test solely because another PM uses one.
Expected outcome: Applicable Class II safety tests meet facility requirements.
17. Restore and Return to Service
Action: Restore filters, doors, cabinet, caps, outlet, flow setting, cord, and approved accessories. Confirm normal sound/vibration, unobstructed airflow, stable 5 LPM operation, Normal Oxygen indication, and no alarm, odor, or abnormal heat. Document readings and parts.
Expected outcome: The concentrator is fully assembled, within specification, and ready for service.
Electrical Safety Testing
LT-2023 classifies the 525 Series as Class II, double-insulated equipment. Protective-earth resistance is normally not applicable; verify the exact label. Record the analyzer/standard, classification, cord/polarity inspection, touch/enclosure leakage result, facility limit, and pass/fail status. The reviewed manual does not provide one routine PM leakage-current limit, so use current facility/NFPA 99 criteria for the exact configuration.
Pass / Fail Criteria
Pass
- Identity, rating, hours, filters, environment, and manual are verified
- Cabinet, mobility, vents, outlet, flowmeter, controls, power components, and labels pass
- Due cleaning, reprocessing, and filter service are complete
- Startup, audible, power-failure, low-flow, and oxygen-status checks pass
- Flow reaches 5 LPM and meets the approved verification criterion
- Oxygen concentration meets the exact model limit after 20 minutes at 5 LPM
- Outlet pressure is 8.5 ±0.5 psig
- Required internal/compressor work and Class II electrical safety pass
Remove From Service
- Required between-patient processing cannot be completed
- A safety-affecting enclosure, mobility, power, outlet, flowmeter, vent, filter, tubing, wiring, or control defect exists
- Required filtration is missing, damaged, damp, incorrect, or unserviceable
- Any required alarm, flow, oxygen concentration, outlet pressure, or electrical-safety test fails
- Overheating, liquid intrusion, abnormal vibration/noise/odor, or repeated alarm remains
- Qualified repair, pressure adjustment, compressor/sieve service, or calibration is required
Copy/Paste CMMS Work Order Procedure
Use the manufacturer service manual, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.