GE Healthcare Aisys CS2

Asset Type

Anesthesia Machine

Manufacturer

GE Healthcare

Model

Aisys CS2

Manual Reference

Aisys CS2 Technical Reference Manual, 2069137-001, Revision F, August 2024.
Aisys CS2 Planned Maintenance Checklist, 2069137-PMC, Revision E, August 2024.

Manufacturer Recommendation / AEM Status

GE Healthcare lists the main planned-maintenance procedure at a 12-month interval, except for activities specifically assigned a different interval. The manufacturer describes this as a sequential maintenance workflow for trained personnel and states that parts due for replacement should be replaced before completing the checks, tests, and calibrations.

Flow and pressure test equipment should have an accuracy of ±2.5% of reading or better unless a specific test states otherwise.

Manufacturer-Listed Replacement Intervals

Every 12 Months

• Bacterial filter, part number 2096308-001-S, for machines running System Software 11 or 12.
• ACGO cover kit, part number 2084453-001, when applicable.

Every 24 Months

• Free-breathing valve, part number 0211-1454-100.
• Free-breathing valve O-ring, part number 1503-3208-000.

Every 48 Months

• Display battery, part number 1009-5800-000. The manufacturer checklist notes that logs are erased in connection with this replacement.
• System battery, part number 5940648-S.

The manufacturer checklist includes a field to identify the applicable 6-, 12-, 24-, or 48-month service interval. The standard functional PM activities are listed at 12 months, while the 24- and 48-month selections identify additional interval-based replacement work.

Respiratory gas modules require maintenance under the applicable gas-module Technical Reference Manual. The Aisys CS2 procedure does not replace the separate module-specific maintenance procedure.

If the facility performs this maintenance at a different interval or changes the manufacturer-listed activities, the change should be managed through the facility’s approved AEM program, risk assessment, maintenance history, and applicable regulatory requirements.

What This PM Procedure Covers

• Interval-based parts replacement.
• External and mechanical inspection.
• Pipeline, cylinder, and oxygen-supply alarm testing.
• AGSS and breathing-system inspection.
• Ventilator diagnostics and calibration checks.
• Vaporizer and gas-mixer testing.
• Alternate and auxiliary oxygen-flowmeter testing.
• Optional integrated suction testing.
• Airway gas-module calibration when applicable.
• System checkout and alarm verification.
• Power-failure and battery-capacity testing.
• Electrical safety testing.
• Final return-to-service configuration.

Required Tools and Equipment

• Current Aisys CS2 Technical Reference Manual.
• Aisys CS2 Planned Maintenance Checklist, form 2069137-PMC.
• Flow and pressure measurement equipment with accuracy of ±2.5% of reading or better.
• Electrical safety analyzer.
• Appropriate gas supplies and cylinder connections for the installed configuration.
• Test lung or breathing-circuit test setup as directed by the manufacturer.
• Pressure gauge or manometer suitable for cmH₂O and mmHg measurements.
• Calibrated flow analyzer capable of low-flow and 10 l/min testing.
• Aisys CS2 electronic-vaporizer test cassette.
• Leak-test bulb and associated adapter for ACGO low-pressure leak testing when applicable.
• Approved airway-module calibration gas for the installed respiratory gas module.
• Vacuum source and vacuum test gauge for the optional integrated suction regulator.
• Replacement parts due at the applicable service interval.
• Infection-control supplies and appropriate PPE.

Do not perform testing or maintenance while the system is being used on a patient. Follow facility infection-control procedures because used equipment may contain blood or body fluids.

Step-by-Step PM Procedure

1. Verify Equipment Status and Service Interval

Action:

• Remove the anesthesia machine from clinical service.
• Record the equipment ID, serial number, software version, service date, and technician.
• Determine whether this is a 12-, 24-, or 48-month service.
• Review previous service records, reported problems, and active service-log entries.
• Confirm whether the machine is equipped with SCGO or ACGO, an electronic vaporizer, respiratory gas module, alternate O₂ flowmeter, auxiliary O₂ flowmeter, integrated suction regulator, EZchange canister, condenser, network ports, or connected devices.

Expected outcome: The correct PM scope and interval-based replacements are identified before testing begins.

2. Replace Interval-Based Parts

Action: Replace applicable manufacturer-listed parts before completing the functional tests.

• 12-month bacterial filter, 2096308-001-S, for System Software 11 or 12.
• 12-month ACGO cover kit, 2084453-001, when applicable.
• 24-month free-breathing valve, 0211-1454-100.
• 24-month free-breathing valve O-ring, 1503-3208-000.
• 48-month display battery, 1009-5800-000.
• 48-month system battery, 5940648-S.

Follow the detailed replacement procedures in the Technical Reference Manual. Erase or manage logs as specified when replacing the display battery.

Expected outcome: All parts due at the applicable service interval are replaced and documented.

3. Perform the Visual and Mechanical Inspection

Action: Inspect the following:

• Display fan filter.
• Upper and lower rear-access-panel filters.
• Display, cabinet, frame, base, drawers, arms, shelves, and mounting hardware.
• Casters and wheel locks.
• Labels and markings.
• External tubing, rubber components, hoses, and pipeline hoses.
• Power cord and other external electrical cabling.
• Display-arm counterbalance, side-to-side movement, and tilt.

Clean reusable filters when permitted by facility procedure or replace damaged filters as appropriate.

Expected outcome: Filters are clean; structural parts are secure and undamaged; casters roll and lock properly; labels are legible; hoses, tubing, and cables show no deterioration; and the display arm remains positioned and moves correctly.

4. Verify Startup Annunciators

Action: Turn the system switch on and listen during startup.

• Verify an initial audible beep when the system is switched on.
• Verify a second beep several seconds into startup.
• Verify a third and fourth beep from the display unit before startup completes.

Expected outcome: All four manufacturer-listed startup audible indications occur.

5. Test Pipeline and Cylinder Supplies

Action:

• Display the Gas Supply window.
• Disconnect all pipeline supplies and close all cylinder valves.
• Verify all gas-pressure gauges read zero.
• Confirm that a low O₂ supply alarm occurs.
• Connect each pipeline supply individually and confirm that the corresponding displayed gauge indicates facility pipeline pressure.
• Open each cylinder individually and confirm the corresponding cylinder-pressure indication.
• Close each cylinder and test for high-pressure leakage.

Expected outcome: Each pipeline and cylinder is correctly identified. With supplies disconnected, gauges read zero and the low-O₂ alarm occurs. Cylinder pressure decay after one minute is less than 690 kPa / 100 psi for each cylinder.

Record each cylinder separately.

6. Perform the O₂ Supply Alarm Test

Action: Perform the manufacturer-listed O₂ supply alarm test.

Expected outcome:

• Low O₂ supply alarm occurs.
• O₂ flow stops.
• N₂O flow stops.
• Air continues to flow when air is selected as the balance gas.

7. Inspect and Test the AGSS

Action:

• Inspect the scavenging system, hoses, receiver, reservoir, connections, and adjustable or active scavenger components.
• Perform the scavenger positive-pressure-relief functional check using the manufacturer procedure.

Expected outcome: Scavenging components are connected, unobstructed, undamaged, and mechanically functional. Test pressure does not rise by more than 10 cmH₂O.

8. Inspect the Advanced Breathing System

Action: Inspect the following:

• Inspiratory and expiratory flow-sensor module.
• Breathing-circuit module and O₂ sensor.
• Absorber canister and locking mechanism.
• Bellows, bellows housing, and seals.
• APL valve.
• Bag port and negative-pressure-relief components.
• Bag/Vent switch.
• Exhalation valve.
• EZchange canister and condenser when equipped.

Perform the bellows-drop test with the assembly upright and inverted.

Expected outcome: Components are clean, correctly assembled, undamaged, and functional. The bellows does not fall within one minute in either the upright or inverted test position.

9. Inspect the Free-Breathing Valve

Action:

• Inspect the free-breathing valve.
• At the 24-month interval, replace the valve and O-ring before testing.
• Complete the manufacturer-listed functional inspection after reassembly.

Expected outcome: The free-breathing valve is correctly installed, moves freely, and passes the applicable ventilator checks.

10. Review Logs and Run Ventilator Tests

Action:

• View or copy the service logs.
• Investigate unresolved or recurring entries.
• Run the Flow and Pressure test.
• Run Circuit O₂ Cell at 21%.
• Run Circuit O₂ Cell at 100%.
• Run the MOPV pressure-relief-valve test.
• Run the Pressure Limit Circuit test.
• Run Manifold P Span.
• Run Inspiratory Flow Valve Calibration stages 1 and 2.
• Run Bleed Resistor Calibration.
• Run Paw Span.
• Run Zero Gas Transducers.
• Run Zero Mixer.

Expected outcome:

• Flow and Pressure displays Pass.
• Both O₂-cell tests display Pass.
• The MOPV relief weight operates and produces the expected purring sound.
• During the pressure-limit test, “Over Pressure Circuit” briefly reads High and returns to OK.
• “Gas Inlet Valve Feedback” reads Closed.
• Each listed calibration displays Pass.

Do not adjust the machine solely to obtain a passing result without investigating the cause of an initial failure.

11. Run Display Diagnostics

Action:

• Perform the LED test.
• Perform the speaker test.
• Perform the battery test.
• Perform the hard-key test.
• Perform the LCD color-screen test.
• Perform touchscreen calibration.

Expected outcome: LEDs flash five times; the speaker sounds for two seconds; the battery test displays Passed; the speaker sounds as each hard key is pressed; the LCD cycles through the test screens; and touch targets calibrate successfully.

12. Test Network Connectivity

This step applies to System Software 11 and 12.

Action: Run the Network Connectivity Test for all configured ports and devices.

Expected outcome: Each enabled interface shows a green Pass indication. A red X indicates a configuration problem, and an orange question mark indicates a runtime error. Unconfigured interfaces may show Not Applicable.

Document results for Port 1, the Port 1 device, Port 2, Port 2 devices, and the log-transfer interface. Network testing is only applicable to configured interfaces.

13. Test the Electronic Vaporizer

Action:

• Insert the electronic-vaporizer test cassette.
• Run the eVap test.
• Install each therapy cassette used with the machine and perform the therapy-cassette leak test.

Expected outcome: The test-cassette procedure displays Pass or Complete. Therapy-cassette leak flow is stable and ≤10 ml/min.

Remove from service any cassette that leaks or is not recognized.

14. Test the Electronic Gas Mixer

Mixer Outlet Check-Valve Leak Test

Action: Pressurize the test setup to 200 mmHg and observe pressure for 30 seconds.

Expected outcome: Pressure decreases by no more than 10 mmHg in 30 seconds.

Mixer Flow Verification

Action: Measure 100% O₂, air, and N₂O at 10 l/min and at 0.5 l/min.

Expected outcome:

• At a 10 l/min setting: 9.0–11.0 standard l/min.
• At a 0.5 l/min setting: 0.45–0.55 standard l/min.

15. Test the Alternate O₂ Flowmeter

Complete this step when the alternate O₂ flowmeter is installed.

Action:

• Turn on alternate O₂ at minimum flow.
• Rotate the control through its range and confirm smooth float movement.
• Measure flow at the manufacturer-listed setpoints.

Expected outcome:

• Minimum: 0.5–0.7 l/min.
• 1 l/min setting: 0.5–1.5 l/min.
• 3 l/min setting: 2.5–3.5 l/min.
• 5 l/min setting: 4.5–5.5 l/min.
• 10 l/min setting: 9.0–11.0 l/min.
• Fully open maximum: 10.0–13.0 l/min.
• The float rises smoothly and remains stable at the selected flow.

16. Test the Auxiliary O₂ Flowmeter

Complete this step when the auxiliary O₂ flowmeter is installed.

Action:

• Turn the flow control fully clockwise.
• Verify complete shutoff.
• Increase flow and verify smooth float movement.
• Measure the listed flow setpoints.

Expected outcome:

• At shutoff, the float rests at the bottom and does not move.
• 1 l/min setting: 0.5–1.5 l/min.
• 3 l/min setting: 2.5–3.5 l/min.
• 5 l/min setting: 4.5–5.5 l/min.
• 10 l/min setting: 9.0–11.0 l/min.
• Fully open maximum: ≥12.0 l/min.

17. Test the Integrated Suction Regulator

Complete this step when the integrated suction regulator is installed.

Action: Test the gauge zero position, gauge accuracy at 100, 300, and 500 mmHg, maximum flow, regulator setpoint, vacuum bleed, and vacuum leakage with the regulator off.

Expected outcome:

• Off position: gauge rests within the zero bracket.
• At 100 mmHg: indication is 62–138 mmHg.
• At 300 mmHg: indication is 262–338 mmHg.
• At 500 mmHg: indication is 462–538 mmHg.
• Maximum flow: ≥20 l/min.
• Regulator test: 100 mmHg ±10 mmHg.
• The gauge returns to the zero range within 10 seconds during the bleed test.
• The gauge does not rise during the off-position leak test.

18. Perform the O₂ Flush-Flow Test

Action: Perform the flush-flow test using the manufacturer setup and measure bellows fill time.

Expected outcome: The bellows fills in 1.8–2.3 seconds.

19. Calibrate the Respiratory Gas Module

Complete this step when an applicable airway module is installed.

Action:

• Allow the module to warm up.
• Use the module-specific calibration procedure and approved calibration gas.
• The checklist identifies nominal gas values of CO₂ 5.0%, O₂ 54.5%, N₂O 36.0%, and anesthetic agent/desflurane 2.0%.

Expected outcome: Displayed gas values calibrate to the certified calibration-gas values.

The gas module has its own maintenance requirements. Do not treat this calibration as the complete module PM.

20. Run the System Checkout

Action:

• Perform the Full Test.
• For an SCGO system, perform the onboard Low P Leak test.
• For an ACGO system, perform the manual bulb test.

Expected outcome: The Full Test displays Pass or Complete. The SCGO Low P Leak test displays Pass or Complete. For ACGO systems, bulb inflation time is greater than 30 seconds.

21. Perform Alarm Tests

Action: Generate and verify the manufacturer-listed alarms.

Expected outcome: The following alarms occur and are both audible and visible:

• “FiO₂ Low.”
• “FiO₂ High.”
• “MVexp low.”
• “Ppeak high.”
• “PEEP high. Blockage?”
• “Ppeak low. Leak?”

Verify that each alarm clears when the test condition is corrected.

22. Test AC Power Failure and Battery Capacity

Action:

• Connect the machine to AC power and confirm the mains indicator.
• Turn the system on and start a case.
• Disconnect the power cord.
• Verify battery operation and the power-failure alarm.
• Reconnect AC power and verify alarm cancellation.
• Perform the battery-capacity test.

Expected outcome: The mains indicator is illuminated on AC power. When AC is disconnected, the message “Plug in power cable. On battery.” appears. The alarm cancels after AC power is restored. The machine operates on battery for more than 45 minutes.

A failed runtime test requires battery investigation or replacement. Do not return the machine to service with unverified backup-power capability.

Electrical Safety Testing

Use an approved medical electrical safety analyzer.

Ground Resistance

Measure between the ground pin of the AC line-cord plug and a pipeline inlet.

Ground resistance measured in ohms, expected ≤ 0.20 Ω:
Result =
Pass / Fail =

The manufacturer’s limit of ≤0.20 Ω is more restrictive than a generic 0.5 Ω facility criterion and should be used for this manufacturer-aligned procedure.

Touch/Chassis Leakage Current

Touch/chassis leakage measured in microamps:
Supply voltage = 100/120 Vac / 220/240 Vac
Facility limit used = Manufacturer limit of <300 µA at 100/120 Vac or <500 µA at 220/240 Vac
Result =
Pass / Fail =

Pass / Fail Criteria

PM Pass Criteria

The Aisys CS2 passes PM when:

• All applicable interval-based parts are replaced.
• Visual, mechanical, pneumatic, gas-delivery, ventilation, vaporizer, alarm, power, and electrical-safety checks meet the manufacturer-listed results.
• The Full Test and required low-pressure leak test pass.
• No unresolved service-log entries indicate a safety or performance problem.
• All installed accessories and optional systems tested under this procedure pass.
• The machine is restored to its correct final configuration.

Remove From Service Criteria

Remove the machine from service when any of the following remain unresolved:

• Gas-supply leak or incorrect gas identification.
• Failure of the O₂ supply alarm or gas cutoff response.
• Breathing-system or low-pressure leak.
• Ventilator calibration or pressure-safety test failure.
• Electronic vaporizer failure or therapy-cassette leakage above 10 ml/min.
• Mixer flow outside the manufacturer-listed limits.
• Alarm-generation or annunciator failure.
• Battery runtime of 45 minutes or less.
• Ground resistance above 0.20 Ω.
• Leakage current at or above the applicable manufacturer limit.
• Damaged structural, electrical, pneumatic, or breathing-system components.
• Failed system checkout or unresolved technical alarm.
• Any condition that prevents confirmation that the system meets manufacturer specifications.

Final Machine Checks

• Disconnect all test devices.
• Reconnect pipeline hoses, monitors, and accessories.
• Verify light bar or gooseneck light operation when equipped.
• Verify vaporizers are locked and in the OFF position.
• Place flow controls at minimum.
• Set the APL valve fully counterclockwise to the minimum/open position.
• Secure all panels and covers.
• Confirm pipeline hoses are connected.
• Turn cylinders off and verify cylinder readings return to zero.
• Plug all units into the appropriate power source.
• Apply the appropriate routine-service label.

Use the manufacturer service manual, facility policy, and approved AEM program to determine the final PM interval and return-to-service requirements.