Mindray A5
Mindray · Model A5
Volume Control Ventilation (VCV). Pressure Control Ventilation (PCV) with volume guarantee. Pressure Support Ventilation (PS). Synchronized Intermittent Mandatory Ventilation in volume and pressure modes (SIMV-VC and SIMV-PC). Automatic compliance compensation and fresh gas compensation maintain accurate tidal volumes. The warmed Breathing System (35º C) virtually eliminates internal condensation. The built in caster guard design clears away cables and hoses. The economical single container absorber reduces compressible dead space volume and accepts non-proprietary prepackaged and loose fill absorbent. Integrated backup control touchpad. Deck lighting with adjustable brightness control. Two hour battery backup.
Key tips
- ·A failed daily leak test takes the machine out of service immediately - there is no acceptable workaround.
- ·Never run an agent-specific vaporizer with the wrong agent, even briefly, during testing.
- ·CO2-absorbent exhaustion mimics several unrelated fault symptoms - rule it out early.
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.
Fails the pre-use check / leak test
HighSymptoms: Circuit leak test fails, self-test aborts, machine not released for use.
Root cause: Breathing-circuit / absorber leak, a worn bag-arm or APL valve, a CO2-absorber canister seal, or an internal pneumatic leak.
Ventilator: pressure / volume delivery fault
HighSymptoms: Set tidal volume or pressure not delivered, PEEP not held, ventilator alarm.
Root cause: Bellows / piston-drive fault, a flow-sensor fault, or an exhalation / drive-gas valve fault.
O2 / agent monitoring or delivery fault
HighSymptoms: FiO2 or agent value off vs a reference, hypoxic-guard alarm, agent not vaporising correctly.
Root cause: O2 sensor aging, a gas-analyser fault, a flowmeter / rotameter fault, or a vaporiser seating / back-bar leak.
Vacuum / AGSS (scavenging) fault
MediumSymptoms: Scavenging alarm, waste gas not evacuated.
Root cause: AGSS flow / connection or a receiver-valve fault.
Battery / power / display fault
MediumSymptoms: Short battery run time, blank or frozen display.
Root cause: Aged battery or a display / power-supply fault.
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.
Flow sensor(s)
Class Frequent wear itemRel. cost $$R&R Fairly easy
O2 sensor
Class Frequent wear itemRel. cost $$R&R Fairly easy
Bellows / drive assembly
Class Major service partRel. cost $$$R&R Difficult
APL valve / breathing-circuit gaskets
Class Periodic replacementRel. cost $$R&R Fairly easy
CO2 absorbent / canister seals
Class ConsumableRel. cost $R&R Easy
Battery pack
Class Periodic replacementRel. cost $$R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Flow sensor(s) | Frequent wear item | $$ | Fairly easy |
| O2 sensor | Frequent wear item | $$ | Fairly easy |
| Bellows / drive assembly | Major service part | $$$ | Difficult |
| APL valve / breathing-circuit gaskets | Periodic replacement | $$ | Fairly easy |
| CO2 absorbent / canister seals | Consumable | $ | Easy |
| Battery pack | Periodic replacement | $$ | Fairly easy |
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.
- ·Daily pre-anesthesia machine check: leak test, O2 sensor calibration, per facility protocol
- ·Scheduled vaporizer calibration and agent-specific service
- ·Absorber / CO2 canister replacement
- ·Breathing circuit and hose inspection
- ·Annual full PM and electrical safety test
Error Codes
Extracted directly from this unit's own service manual.
Flowmeter Voltage Error HighDVCC, AVDD or VC voltage error
1. Restart the machine. 2. Measure the 12V input voltage (voltage on the power cable) of the electronic flowmeter to see if it is within specifications. Check if the cable is defective. If the input voltage is out of specification, replace the power board or cable. 3. If the problem persists, replace the fresh flow sensor board.
Flowmeter Selftest Error High1.CPU, Flash or WTD error. 2.After power on, the CPU board can't communicate with the ventilator control board.
1. Restart the machine. 2. Re-plug or replace the communication cable between the CPU Board and the fresh flow sensor board. 3. If the problem persists, replace the fresh flow sensor board. 5. If the problem persists, replace the CPU board.
Ventilator Selftest Error High1.CPU, TIMER, RAM, WTD, EEPROM or AD error 2.After power on, the CPU board can't communicate with the ventilator control board.
1. Restart the machine. 2. Re-plug or replace the communication cable between the CPU Board and the ventilator control board. 3. If the problem persists, replace the ventilator control board. 4. If the problem persists, replace the CPU board.
Ventilator Voltage Error High5V or 12V voltage error
1. Restart the machine. 2. Measure the input voltage (voltage on the power cable) of the ventilator control module to see if it is within specifications. Check if the cable is defective. 3. If the input voltage is out of specification, replace the power board or cable. 4. If the problem persists, replace the ventilator control board.
PEEP Valve Failure1. PEEP valve voltage error. 2. PEEP valve pressure error.
1. Check if the pressure sensor on the PEEP circuit is within specifications. Perform pressure sensor calibration in the service menu or replace the sensor on the PEEP circuit when the pressure error. 2. Measure the voltage at the corresponding test point 3. Check the connection between power supply and expiratory valve assembly 4. Replace the Ventilator Control Board when necessary. 5. Replace the expiratory valve assembly. 6. Replace the power board when necessary
Insp Valve Failure1. Insp valve voltage error. 2. Insp valve flow error.
1. Check if the Inspiratory flow sensor is within specifications. Perform flow sensor calibration in Service menu or replace the flow sensor when flow error occurs. 2. Measure the voltage at the corresponding test point 3. Check the connection between power supply and expiratory valve assembly 4. Replace the Ventilator Control Board when necessary. 5. Replace the expiratory valve assembly. 6. Replace the power board when necessary
PEEP Safety Valve FailurePEEP safety valve voltage error.
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: Pre-use check / leak test fails
- Run the machine's leak test with the exact circuit and absorber that will be used.
- Reseat the CO2-absorber canister and check its seal; replace exhausted absorbent.
- Inspect the breathing-circuit gaskets, the bag arm and the APL valve.
- Check each vaporiser is seated on the back bar with an intact O-ring.
- Fit a fresh flow sensor and re-run the test.
Symptom: Ventilator or FiO2 fault
- Verify FiO2 with a calibrated analyser at the common gas outlet / wye.
- Calibrate the O2 sensor.
- Check the bellows / drive for a leak or slow fill.
- Confirm the flow sensors read plausibly against a test lung.
- Escalate a confirmed drive / valve fault to the manufacturer.
Technical Specs
- Height
- 55.1 in
- Gases
- Air, Nitrous Oxide, Oxygen
- Length
- 31.7 in
- Vaporizers (Max)
- Two
- Weight
- 353 lbs
- Inspiratory Flow (max)
- 30 L/min
- Vaporizer Type
- Electronic control
- Vent Modes
- Volume Control Ventilation (VCV) and Pressure Control Ventilation (PCV), Pressure Support, Manual/spontaneous
- Width
- 41.3 in
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Operating rooms
- Procedure / endoscopy suites requiring sedation
- Obstetric delivery rooms
Documents & Manuals
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