Portable Benchtop Gravity Autoclave (Class N)

What is the Portable Benchtop Gravity Autoclave (Class N)?

A compact front-loading or top-loading benchtop autoclave of 8 to 35 L using gravity air removal. It gives field laboratories, clinics and teaching sites a low-cost sterilizer for unwrapped solid instruments and simple loads.

Overview

The Class N benchtop autoclave is a compact, simple steam sterilizer for naked solid instruments, as defined in EN 13060. A small chamber of 8 to 35 L is heated by an internal generator or base heater, and air is removed by steam displacement without a vacuum pump. Typical cycles run at 121 or 134 °C with hold times of 3 to 20 minutes, and total cycle times of 30 to 60 minutes including heating and cooling. The units are light, about 15 to 40 kg, and plug into a standard socket, making them suited to field stations, small clinics and teaching sites. They are not designed for wrapped, hollow or porous loads, and drying is limited. Manual water filling and basic controls keep cost and maintenance low.

How does it work?

An autoclave sterilizes by exposing items to saturated steam under pressure. At 103 kPa gauge, steam reaches 121 °C, and at about 205 kPa it reaches 134 °C. Steam condenses on cooler surfaces, releasing latent heat that denatures proteins and destroys microorganisms far faster than dry heat at the same temperature. A cycle has three main phases: air removal, sterilization hold and exhaust or drying. Gravity-displacement units push air out through a drain by steam flow, while pre-vacuum units use a vacuum pump to remove air before steam admission, which penetrates porous loads and hollow instruments. A steam generator or jacket supplies steam, a controller reads temperature and pressure sensors, and safety valves, door interlocks and overpressure devices protect users. Validated hold times typically range from 3 to 30 minutes depending on load and temperature.

What are the key features?

• Compact chamber of 8 to 35 L suits small benches and mobile sites.
• Gravity air removal avoids the cost of a vacuum pump.
• Plugs into standard single-phase supply, with weight of 15 to 40 kg.
• Basic microprocessor or analog timer controls.
• Door interlock and safety valve for safe operation.
• Low purchase and maintenance cost.

What are the technical specifications?

A typical portable benchtop gravity autoclave (class n) configuration offers chamber volume of 8-35 L, sterilization temperature of 121 and 134 °C, working pressure of Up to 0.22 MPa, air removal of Gravity displacement, cycle time (121 °C, unwrapped) of Approx. 40-60 min and chamber material of SUS304 stainless steel. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Portable Benchtop Gravity Autoclave (Class N) is used in teaching laboratories, field and mobile laboratories, small clinics and unwrapped instrument sterilization. Across the wider Autoclaves class, laboratories also deploy it for microbiology media sterilization, laboratory waste decontamination and glassware and instrument sterilization.

Which standards and certifications apply?

Relevant standards and methods include EN 13060, EN 285, ISO 17665-1, ISO 11138, ASME BPVC Section VIII, GB 8599 and EN 61010-2-040. Certification candidates for this model are CE, ISO 9001 manufacturing and EN 13060 Class N type test; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the autoclave on a level floor with clearances specified by the maker for service and ventilation, and provide a drain, water supply and electrical circuit sized to the heater. Use distilled, deionized or conditioned water as specified to limit scale. Pressure vessels are regulated in most countries, so arrange registration, periodic inspection and operator training. Qualify the unit with installation and operational checks, then validate each load type using thermocouples and biological indicators such as Geobacillus stearothermophilus spores. Perform Bowie-Dick or helix tests daily on vacuum models. Inspect door seals, gaskets and safety valves regularly, descale the chamber and steam generator, and calibrate sensors annually. Never autoclave sealed containers, solvents or bleach-containing waste.

How do I select the right Portable Benchtop Gravity Autoclave (Class N)?

Select the Class N benchtop autoclave for simple, unwrapped solid loads at low cost or in mobile settings. Choose Class B for wrapped or hollow loads. Specify chamber volume, voltage, weight limit, timer controls and any cycle data needs in the RFQ.

How does it compare with other Autoclaves variants?

Match the autoclave to the load and the level of assurance required. Liquids, glassware and waste can be processed in gravity cycles, while wrapped instruments, porous textiles and hollow devices need pre-vacuum to remove air. Select chamber volume from the largest load and throughput, typically 18 L for small benchtop units to 1000 L or more for floor-standing models. Decide between top-loading vertical units for economy, front-loading horizontal units for ergonomics, and double-door pass-through units to separate clean and contaminated zones. Check cycle options, such as liquid, waste and dry cycles, printer or data logging, and validation support. Confirm the pressure vessel code, steam source and water quality, and compare electrical or steam supply requirements and installation space, including door swing and drainage.