Anesthesia Equipment Maintenance

Oxygen Cylinder and Equipment Specifications

• A fully filled steel oxygen cylinder contains 440 liters of medical oxygen.
• It is critical to ensure the drain valve does not open at pressures below 10 embar.
• The BG-4 breathing apparatus weighs 15 kg (33 lbs) when fully charged.
• The maintenance of the BG-4's battery is crucial; it should be replaced every 6 months.
• Avoid replacing batteries in potentially explosive environments.

Pressure Measurement and Flow Rates

• Sentinel pressure measurement accuracy is ±2% of the final value.
• The first low pressure warning triggers at approximately 700 psi, indicating about 75% oxygen used.
• The last low pressure warning occurs at approximately 145 psi, with roughly 95% oxygen depleted.
• Medium pressure in the BG-4 ranges between 58 psi and 64 psi.
• The minimum valve provides flow rates greater than 80 L/min.

Testing Procedures and Guidelines

• Conduct supply checks on the Sentinel every 15 minutes.
• During the constant dosage test, the RZ-25 tester should indicate a flow of 1.5 to 1.9 LPM.
• The breathing bag has a volume of 5.5 liters.
• Proper testing involves adjusting the zero point on the RZ-25 tester before conducting tests.
• Use a test adapter to connect the BG-4 apparatus to the RZ-25 tester.

Maintenance and Safety

• Rubber components must be shielded from radiation and avoid exposure to solvents like acetone and alcohol.
• Ensure belt and harness are dry before storage to prevent mold and fungus growth.
• A failed self-check on the device is indicated by symbol X with an error code.

Alarm and Warning Systems

• The yellow panic button initiates the main alarm on the Sentinel.
• First low pressure alarm emits intermittent sounds for about 30 seconds with a flashing red LED.
• The pressure relief valve operates between +20 and +50 millimeters (+2 embar to +5 embar) on the water gauge.

Component Care and Troubleshooting

• Use Dow Corning 111 to lubricate O-rings.
• To prevent leaks, check the inhalation and exhalation valves for defects.
• The proper functioning of the exhalation valve should show -10 embar and +10 embar for inhalation cycles on the pressure gauge.
• During a positive pressure leak test, ensure pressure drop is less than 1 embar within one minute.

Cartridge and Chemical Usage

• Only DRAGERSORB 400 should fill the refillable cartridge, which remains good for 4 years from the manufacture date.
• Factory-packed cartridges are also viable for the full four years.
• A positive pressure within the breathing circuit is essential to stop ambient air infiltration.

Regulatory Compliance

• The BG-4 system is approved for use with both factory and refillable cartridges.
• Steel cylinders are considered full at 3135 psi when a + sign is marked post hydro test.