Laboratory sterilizer LS series

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Product Introduction
Reliable dual-mode counter-pressure sterilizer designed for food packaging quality control and laboratory aseptic evaluation. The vertical counter-pressure retort is a medium-small mechanically program-controlled sterilization unit using electric heating. Water is injected into the chamber and heated to generate the pressurized steam required for sterilization. After sterilization, compressed air and water pressure enable rapid counter-pressure cooling within approximately 3 minutes, reducing internal temperatures to about 30–40°C.

Working Principle
Dual sterilization logic supports boiling disinfection and high-pressure counter-pressure sterilization to simulate industrial thermal processing for flexible packaging samples. The heater directly heats water to produce pressurized steam that acts on microorganisms on samples to achieve sterilization. For rapid-cooling programs, a preset volume of water is heated (about 25 minutes to reach holding stage), sterilization holding typically lasts 35–40 minutes, then 0.24 MPa compressed air and tap-water pressure are applied while the drain valve is partly opened to discharge water and perform counter-pressure cooling for about 3 minutes, cooling internal items to ~30–40°C.

Core Advantages

• Dual-mode operation: boiling disinfection and counter-pressure sterilization
• Ultra-fast ~3-minute counter-pressure cooling to prevent deformation of flexible pouches
• Heater overload protection and audible alarm at cycle completion
• Multiple chamber volumes: 35 L, 50 L, 75 L, 100 L to suit different throughput
• Mechanical program control for straightforward laboratory operation

Technical Parameters
Max Working Pressure: 0.22 MPa (30 Psi)
Max Working Temperature: 135°C
Sterilization Temperature Range: 101–135°C
Boiling Temperature: ≤100°C
Timer Range: 1–60 min
Effective Chamber Volume: 35 L, 50 L, 75 L, 100 L
Power / Power Supply: 2.5 kW / AC220V 50Hz; 3 kW / AC220V 50Hz; 4.5 kW / AC220V 50Hz
Overall Dimensions: 35L 570×550×970 mm; 50L 590×590×1110 mm; 75L 650×630×1150 mm; 100L 680×650×1220 mm
Gross / Net Weight: 56/42 kg (35L); 68/50 kg (50L); 90/70 kg (75L); 105/85 kg (100L)

Application Scenarios
Widely used in food R&D laboratories, packaging manufacturers and quality inspection institutes for sterilization and heat-resistance testing of flexible food packaging materials.

• Disinfection and sterilization of flexible food packaging, containers and laboratory utensils
• Aseptic testing and thermal-resistance evaluation of packaging samples
• Sterilization of laboratory instruments and small-batch food test specimens

Specifications

• Brand: GBPI
• Item Number: GZM-100G
• Product Origin: China
• Shipping Port: Guangzhou
• Lead Time: 30 days
• Effective Chamber Volume Options: 35 L, 50 L, 75 L, 100 L
• Max Working Pressure: 0.22 MPa (30 Psi)
• Max Working Temperature: 135 °C
• Sterilization Temperature Range: 101–135 °C
• Boiling Temperature: ≤100 °C
• Timer Range: 1–60 minutes
• Power / Power Supply: variants include 2.5 kW / AC220V 50Hz; 3 kW / AC220V 50Hz; 4.5 kW / AC220V 50Hz
• Overall Dimensions (by volume): 35L 570×550×970 mm; 50L 590×590×1110 mm; 75L 650×630×1150 mm; 100L 680×650×1220 mm
• Gross / Net Weight (by volume): 56/42 kg (35L); 68/50 kg (50L); 90/70 kg (75L); 105/85 kg (100L)
• Cooling: counter-pressure rapid cooling using compressed air and tap-water (approx. 3 minutes)
• Controls & Safety: mechanical program control, heater overload protection, audible alarm at cycle completion
• Operation Modes: boiling disinfection and pressure sterilization with rapid cooling