Standard BOD Incubator

What is the Standard BOD Incubator?

A standard BOD incubator holds a fixed 20 C refrigerated chamber for routine five-day BOD testing. It is the baseline model for environmental and wastewater laboratories with steady routine workloads and predictable sample counts.

Overview

The standard BOD incubator is a refrigerated, dark chamber fixed at 20 C with a tolerance of about plus or minus 1 C, built around compressor cooling and PID-controlled heating. Forced-air circulation keeps uniformity within plus or minus 0.5 to 1 C, and shelves or racks hold BOD bottles or other vessels. A digital controller with deviation alarm is standard, and defrost is scheduled to avoid disturbing the five-day test. Chamber volumes run 100 to 400 liters, with power of 300 to 800 W and stainless steel interiors. It suits environmental laboratories performing routine influent, effluent and surface water BOD where the method is well established and sample counts are predictable.

How does it work?

A BOD incubator maintains a fixed setpoint, commonly 20 C, with compressor refrigeration and heating under PID control, so it holds temperature whether the room is warmer or cooler. Forced-air circulation keeps uniformity within plus or minus 0.5 to 1 C across the chamber, and a door heater or heated frame prevents condensation at the fixed low temperature. The interior is dark, since light can affect samples and encourage algae, and shelves or racks hold BOD bottles or other vessels. Defrost cycles are scheduled to avoid temperature excursions during the five-day test, and many models include a timer or chart for the incubation period. Alarms warn of temperature deviation, and some units log temperature continuously so a valid test can be demonstrated.

What are the key features?

• Refrigerated chamber fixed at 20 C
• Uniformity of ±0.5 to 1 C with forced air
• Dark interior with shelves or bottle racks
• Digital controller with deviation alarm
• Scheduled defrost to protect the test
• Chamber volume of 100 to 400 liters

What are the technical specifications?

A typical standard bod incubator configuration offers chamber volume of 100–400 L, temperature range of 0–60 C, set at 20 C, temperature uniformity of ±0.5–1 C, temperature stability of ±0.5 C, cooling system of Compressor, air-cooled and defrost of Automatic or scheduled. 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 Standard BOD Incubator is used in routine five-day BOD testing, influent and effluent monitoring, surface water BOD determination and environmental laboratory sample holding. Across the wider BOD Incubators class, laboratories also deploy it for five-day BOD determination in water and wastewater, biochemical oxygen demand method training and influent and effluent monitoring.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61010-2-010, DIN 12880, APHA 5210, ISO 5815-1 and ISO 9001. Certification candidates for this model are CE, ISO 9001 manufacturing and RoHS; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Place the incubator in a ventilated location with clearance for the condenser and door swing, away from heat sources and direct sunlight. Keep the interior dark and do not open the door during the incubation other than at defined checkpoints, since temperature recovery may alter the result. Verify the temperature at the working setpoint with a calibrated probe, and log it continuously where the method requires evidence. Clean spills promptly and disinfect as needed, taking care not to scratch the interior or leave residues that affect samples. Check the condenser, gaskets and door heater during scheduled service, and record all maintenance.

How do I select the right Standard BOD Incubator?

Select the standard BOD incubator for routine testing at a fixed 20 C where bottle counts are predictable. Programmable or dual-chamber models suit regulated work needing records or higher throughput. In the RFQ, specify volume, bottle capacity, temperature tolerance, defrost behaviour and alarm features.

How does it compare with other BOD Incubators variants?

Choose a BOD incubator when a method specifies incubation at a fixed low temperature, most often the 20 C five-day BOD test, and when the laboratory needs to show that temperature was held. Set the required temperature and tolerance, then check uniformity at that point rather than a midpoint. Match chamber volume to bottle count and to the use of racks or shelves. Confirm defrost behaviour, since ice build-up or regular defrost cycles can disturb the incubation. Decide whether programmable control, dual chambers or temperature logging are needed for compliance. Check door type, alarms, data output and refrigerant type before ordering.