Oven and Freezer Calibration

Oven and Freezer Calibration

Environmental chambers are used for a wide variety of functions throughout many industries. In certain industries some operations use ovens to cure components by heating them to set bonding materials, others use freezers in scientific research. In the life sciences industry, environmental chambers are used to sterilize medical equipment and decontaminate materials.

In any manufacturing facility, it is essential to calibrate the equipment to ensure accurate measurements to ensure the quality of equipment and products.

Whatever the process, it is important to ensure that your environmental chamber is operating correctly and accurately. Materials often rely on the performance of key components such as temperature controllers, timers, fans, and exhaust vents, etc. If anyone of the components in the setup is performing inaccurately, it can have a negative effect on the product. Calibration should be done with full validation which includes temperature controller calibration, chart recorder calibration, temperature uniformity, and traceability to a standard.


Calibration of Ovens

Many ovens are already designed to simplify the temperature controller calibration procedure. Some of them have a built-in secondary sensor mounted along with the primary temperature sensor to provide an easy way to calibrate the controller and deliver accurate oven temperatures. In certain conditions, full-range calibration is not necessary, and if a single point temperature e.g. 65°C is met then the calibration is considered to be sufficient.

It is normally a requirement that ovens provide highly controlled temperature, but it is also essential to ascertain these temperatures accurately. To get accurate oven temperatures it is important to check the performance of the controller regularly. A NIST certified thermal measurement device should be used to check for accuracy, by comparing it with the temperature displayed by the oven controller. It is expected that this accuracy to be within ±0.5°C.

Most ovens use a radiant heating system that heats the sidewalls of the stainless steel interior of the oven to provide uniform heating within the oven compartment. A sensitive Resistive Thermal Device (RTD) is used as a temperature sensor that allows the selected operating temperature to be regulated within ±0.2°C from the setpoint by the temperature controller. The RTD is embedded in a thin stainless steel probe, about the size of a pencil which provides quite accurate temperature measurements.


Calibration of Freezers

Commercial, industrial, and laboratory freezers are designed specifically for their required purpose. Their size and configuration range from small tabletop units to large freestanding models, some are even walk-in cabinets, the size of a large room. All types of standard, special purpose, and high-performance freezers which may have different temperature ranges, stability, and other performance characteristics need to be calibrated for optimum results. Almost all types of freezers have built-in test functionality and accurate temperature control when designed for industrial, clinical, and scientific applications that require accurate temperatures.

Accurate freezer temperature calibration is essential to ensure products, processes, and research procedures are maintained at strict requirements. There are predefined temperature mapping protocols and calibration routines that are used by most pharmaceuticals, biotechnology, food manufacturing, and industrial applications.

One needs highly skilled technicians to calibrate various types of research and industrial freezers or refrigerators in almost every configuration to meet quality considerations and regulatory compliance.

If the calibration is done diligently then it will ensure that your freezer – even when used in highly sensitive areas – will operate within required tolerance limits. To attain a high level of accuracy you should ensure that the calibration is performed by an ISO/IEC 17025 accredited laboratory for all types of models including benchtop, walk-in, and other special freezer configurations.

Specialized cold storage for life sciences and other industries require greater control over constant temperature. Calibrations can cover various aspects of commercial freezer operations, including temperature distribution to meet the stringent regulatory guidelines regarding cold storage.

Freezer temperature verification is done by using high-accuracy Precision Reference Thermometers (PRTs). ISO 17025 accredited freezer calibration services can accommodate a wide range of units with precision temperature measurement ranges and specific operational requirements. Calibrations should be performed in accordance with the regulatory guidelines which should be well documented, internally monitored, and externally audited by proven quality management systems. Often temperature tolerance is a key requirement of certain industries. The calibrating laboratory must have high-level capabilities and should also be accredited to relevant national agencies.

Through routine and accurate calibration, you can be assured that your environmental chamber be it an oven or a freezer is operating correctly. You should maintain the calibration schedule and quality management requirements that your industry demands. Tracking the calibrations and preparation of related compliance documentation is essential in this process.


e2b calibration temperature calibration capabilities include industrial and freezer oven calibration services, offering top-notch precision and expert attention to detail. Our team is experienced and equipped to perform full validation which includes NIST traceable temperature controller calibration, chart recorder calibration, temperature uniformity, and more. Contact e2b calibration for more information including on-site services.


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