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A comprehensive guide covering standard operating procedures, essential daily maintenance, safety precautions, and regular calibration for high-pressure steam sterilizers.
Core Objective: Ensure complete sterilization, prevent accidental equipment damage, extend operational lifespan, and maintain laboratory safety.
1. Standard Operating Procedures (Core Workflow)
1.1 Pre-Operation Check
- Water Level Verification: Ensure the heating element is completely submerged. Use distilled or deionized water only; do not use tap water.
- Sealing Ring Inspection: Confirm the gasket is clean, intact, and free from cracks or deformation.
- Valves Check: Verify that the exhaust valve and safety valve are clear and unobstructed.
- Load Placement & Preparation: Do not overload or tightly pack items; leave adequate space for steam circulation. Loosen bottle caps by half a turn. Use paper-plastic or non-woven packaging bags. Do not fill liquid containers past 2/3 capacity to prevent boiling over.
1.2 Operation & Sterilization Cycle
- Lid Closure: Close the door and tighten the handle/clamps securely. For buckle-type lids, apply force evenly across opposite sides to prevent uneven stress.
- Select Sterilization Program:
- Instruments & General Media: 121°C for 15–20 minutes
- Glucose/Sugar-containing Media: 115°C for 20–30 minutes
- (Note: Preset programs may vary depending on the equipment model.)
- Air Displacement: Start the unit and purge cold air completely. Failure to purge cold air will result in inaccurate temperature readings.
- Timing: Begin timing once the chamber reaches the set pressure and temperature.
1.3 Depressurization & Unloading
- Depressurization: Allow the pressure to reduce naturally and slowly. Do not manually vent pressure abruptly, especially when sterilizing liquids, to prevent hazardous boiling over.
- Opening the Lid: Ensure the pressure gauge reads 0 before opening the door.
- Cool-down Period: Leave the lid slightly open for 5–10 minutes to allow steam to vent before removing items.
- Storage: Move unloaded items to a sterile area for cooling and drying.
2. Daily & Preventive Maintenance Guidelines
2.1 Post-Use Maintenance (After Each Cycle)
- Disconnect power and allow the unit to cool before cleaning the inner chamber and wiping away moisture.
- Clear the exhaust port and filter screen to prevent blockages.
- Clean and wipe the door sealing ring to maintain elasticity.
2.2 Weekly Maintenance
- Clean the internal chamber using clean water or a neutral detergent.
- Inspect the power cord, plug, and status indicator lights for normal operation.
- Check door latches and hinges for smooth mechanical movement.
2.3 Monthly Maintenance
- Clean the safety valve and exhaust valve to ensure they move freely without jamming.
- Check the seal ring for aging or cracking, and replace it if necessary.
- If severe mineral deposits or limescale occur, clean using a specialized descaling agent according to product instructions.
3. Calibration Specifications & Safety Guidelines
3.1 Calibration Schedule
| Inspection Item | Required Frequency | Method / Requirement |
|---|---|---|
| Pressure Gauge & Safety Valve | Annually (Once per year) | Mandatory third-party or internal safety calibration |
| Temperature & Biological Effect | Monthly | Efficacy monitoring using biological indicators (spore strips) |
4. Critical Safety Precautions
Safety Warnings & Prohibitions:
- Overpressure / Over-temperature: Strictly prohibit operating beyond rated pressure and time limits.
- Forced Opening: Never attempt to force open the lid while the unit is running or before pressure drops to zero.
- Dry Heating: Strictly prohibit running the unit without sufficient water.
- Prohibited Materials: Never sterilize flammable, explosive, or volatile chemical substances.