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The Ibex Sciences LS-75HD (75L) Vertical Pressure Steam Sterilizer is the larger sibling to the 50L variant, sharing the identical structural blueprint and micro-processing architecture but scaling up the volume capacity to 75 Liters. It is a floor-standing, top-loading autoclave manufactured under standard Chinese industrial frameworks for high-throughput laboratory sterilization.
⚙️ Technical Specifications
The standard operational matrix for the Chinese LS-75HD platform scales up physical capacity while maintaining precise thermal bounds:
- Chamber Volume: 75 Liters (Internal dimensions approx. ∅400mm × 600mm).
- Maximum Working Temperature: 134°C (Adjustable range from 105°C to 134°C).
- Maximum Working Pressure: 0.22 MPa (32 psi).
- Heating System Power: 4500 Watts (4.5 kW) (upgraded from the 50L version to account for the larger water volume).
- Voltage Requirement: AC 220V / 50Hz single-phase (requires a dedicated, high-amperage laboratory circuit breaker).
- Timer Range: Digital settings from 0 to 99 minutes or up to 99 hours and 59 minutes.
- Included Accessories: Typically ships standard with two large removable stainless steel wire mesh baskets.
💡 Key Design Features & Comparison to 50L
- Expanded Chamber Diameter: The chamber diameter is widened to roughly 400mm (compared to 340mm on the 50L), allowing you to fit wider 2000ml or 5000ml volumetric flasks that cannot clear the narrower hatch of smaller models.
- Hand-Wheel Quick-Open Door: Features the signature heavy-duty mechanical hand-wheel locking lid. Rotating the wheel forces structural lockpins outwards under the chamber rim for maximum pressure retention.
- Automated Cycle Management: The LCD micro-processing controller manages the full automated loop: pre-heating ➔ cold air displacement ➔ core sterilization timer ➔ exhaust steam cooling ➔ end-alarm.
- Self-Inflating Gasket Ring: Leverages internal steam pressure to naturally force the heavy silastic lid gasket tight, eliminating physical micro-steam leaks under peak load.
- Dual Scale Pressure Gauge: A physical, analog pressure-and-temperature gauge is mounted on the top console, allowing operators to cross-verify the digital readout against real mechanical pressure.
🛡️ Safety & Cutout Protections
- Anti-Dry Burn Assembly: Features an active water-lack cut-off sensor. If fluid drops below the heating element coils, it severs electrical power instantly and sounds a warning alarm.
- Mechanical Pressure Interlock: The door cannot be turned or unlatched if internal chamber pressure exceeds a safe baseline threshold of 0.027 MPa.
- Over-Pressure Safety Valve: A spring-regulated mechanical safety relief valve acts as a physical fail-safe, cracking open to vent pressure if the vessel steps over safe parameters.
🧪 Quick Operation Guide: Sterilizing Liquid Media
Because the 75L chamber holds significantly more thermal mass than smaller autoclaves, follow these parameters to prevent boiling over or incomplete sterilization of liquid media (agar/broth):
- Water Fill: Add distilled water into the chamber until it completely submerges the heating elements and reaches the physical baseline tray grid.
- Standard Liquid Parameters: Program the controller to 121°C for 15 to 20 minutes.
- Exhaust Setting (Crucial): Set the exhaust valve to Slow Exhaust (or No Exhaust). If you vent the pressure rapidly while sterilizing liquids, the sudden pressure drop will cause the liquids to violently boil over, popping the caps off your flasks and fouling the chamber.
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