Benchtop Stirred-Tank Fermenter

What is the Benchtop Stirred-Tank Fermenter?

A benchtop stirred-tank fermenter is a small vessel with an impeller, sensors and controllers for microbiological cultivation. It is the standard laboratory tool for strain screening, media development and early process studies.

Overview

A benchtop stirred-tank fermenter holds 1 to 10 litres of medium in a glass or small stainless vessel with a detachable headplate. The headplate carries a motor-driven impeller or a magnetic drive, an air inlet with sparger, a condenser and exhaust filter, ports for pH, dissolved oxygen and temperature probes, acid and base lines, antifoam and feed additions, and a sampling port. Control electronics maintain temperature through a jacket or heating blanket, pH by dosing, dissolved oxygen by cascade control of agitation and gas, and foam by antifoam addition. The vessel is usually sterilized in an autoclave while the medium may be sterilized in place or separately. These systems prioritize flexibility, quick setup and complete recording over high volume, and they are commonly used to test several strains or media before scale-up.

How does it work?

A laboratory fermenter provides a sterile, mixed and aerated liquid medium in which sensors measure and controllers regulate the conditions that determine growth and product formation. Agitation by a top- or bottom-driven impeller disperses oxygen and nutrients, and air or enriched oxygen is sparged through the liquid and vented through a condenser and exhaust filter. Temperature is held by a water jacket or heating blanket, pH is corrected by dosing acid or base, and dissolved oxygen is maintained by adjusting stirrer speed, gas flow or gas composition through cascade control. Foam is managed with antifoam or a mechanical breaker, and feed pumps add carbon source in fed-batch mode. Small working volumes allow many experiments with limited material, and glass or small stainless vessels let operators observe the culture and change configuration quickly.

What are the key features?

• Glass or small stainless vessel with detachable headplate
• Impeller or magnetic drive for agitation
• pH, dissolved oxygen, temperature and foam control
• Acid, base, antifoam and feed ports
• Batch profile recording and data export

What are the technical specifications?

A typical benchtop stirred-tank fermenter configuration offers working volume of 1–10 L, vessel material of Borosilicate glass or 316L stainless steel, temperature range of Ambient +5 to 60 °C, pH control of 2–12, ±0.05, dissolved oxygen control of 0–100% air saturation and agitation of 50–1,200 rpm. 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 Benchtop Stirred-Tank Fermenter is used in strain screening, media and feed optimization, growth kinetics studies and small-scale enzyme production. Across the wider Laboratory Fermenters class, laboratories also deploy it for strain screening and selection, media and feed optimization and process development and scale-up studies.

Which standards and certifications apply?

Relevant standards and methods include ISO 9001, EU GMP Annex 1, 21 CFR Part 11, USP <87>, USP <88>, IEC 61010-1 and ICH Q11. Certification candidates for this model are CE, ISO 9001 manufacturing and IEC 61010-1 compliance; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Verify sterilization of the vessel, headplate and lines before inoculation, and confirm that filters and sampling ports are intact. Calibrate pH and dissolved oxygen probes before each run and check their response with standards. Record setpoints, deviations and offline measurements such as cell count and glucose, since these support interpretation and scale-up. Keep an aseptic technique for sampling to avoid contamination, and discard runs that show contamination rather than continuing. Clean probes and vessels promptly, avoid damaging electrode membranes and follow the manufacturer guidance for autoclaving. For process development records, keep batch logs that link conditions to outcomes and note any equipment changes.

How do I select the right Benchtop Stirred-Tank Fermenter?

Choose a benchtop stirred-tank fermenter for flexible small-scale cultivation and rapid experimental turnaround. In an RFQ specify the working volume, vessel material, agitation and aeration ranges, control loops and ranges, port count, sterilization method and data recording features.

How does it compare with other Laboratory Fermenters variants?

Choose the vessel volume from the amount of material and the number of conditions you must test, keeping headspace of about 20 to 30 percent for foam and aeration. Decide between glass, which allows observation and quick reconfiguration, and small stainless steel, which tolerates higher pressure and repeated sterilization. List the control loops you need, the number of sensor and feed ports and whether cascade control, exhaust gas analysis or redox measurement matter. If you screen many conditions, a parallel multi-vessel system with independent control saves time and material. Choose a single-use format when cleaning between experiments would slow you down. Confirm that the control software records batch profiles and exports data, and that you can scale the geometry and control strategy to pilot and production vessels.