For the purpose of this standard, the following terms and definition apply.
Heating oven: electrically heated cabinet enabling temperatures of a few degrees Celsius above ambient temperature to a maximum of 200℃, 250℃ or 300℃ to be controlled
Drying oven: heating oven used for drying samples
Vacuum drying oven: drying oven capable of maintaining vacuum in the inner chamber
Incubator: heating oven used for biological or microbiological applications, with a limited temperature range and increased requirements regarding temperature stability and temperature homogeneity in the usable space.
Cooled incubator: incubator enabling the control of temperatures below ambient temperature, for example within a temperature range of 5℃ to 70℃.
Shaking incubator: incubator fitted with an integrated device for shaking the samples.
Inner chamber: space delimited by the inner walls, i.e.internal height, width and depth of the heating oven or incubator (or internal diameter and depth in the case of round cabinets)
Usable space: that part of the inner chamber for which the temperature variations specified by the manufacturer apply
Sample: any material, workpiece, receptacle containing a substance or similar charging material to be conditioned in the heating oven or incubator
Temperature homogeneity: spatial temperature variation characterized by the maximum temperature difference between two measuring points within the inner chamber of the heating oven or incubator
Temperature stability: temporal temperature variation characterized by the maximum temperature difference between two measuring points within the inner chamber of the heating oven or incubator
Working temperature range: temperature range between the lowest and the highest adjustable set point temperature
Nominal temperature: highest adjustable set point temperature
Heating ovens intended to be fitted into laboratory benches should be suitable for laboratory benches as specified in DIN EN 13150.
The materials used for the outer and inner chambers, and for fasteners and connecting elements shall be capable of withstanding the temperature and environmental conditions prevailing in the inner chamber when operated as intended. In the operating manual the manufacturer shall inform the user of the materials used and give advise regarding the suitability of these materials for particular applications.
The operating manual shall contain additional information on cleanability and if appropriate, on disinfectability. Users of heating ovens and incubators should make sure that the materials and methods used for cleaning, disinfection and decontamination suit the intended applications.
When selecting material for vacuum ovens, the mechanical stability towards the vacuum to be produced at the maximum temperature in the inner chamber is to be taken into account.
Shelves, plates
Removable shelves, perforated plates or wire mesh trays for samples shall be provided by the manufacturer together with an indication of how much weight they can support. The platform connected to the shaking mechanism of shaking incubators shall be capable of securely fixing the sample to be agitated under all possible shaking conditions.
Temperature indicator and operating controls
To indicate the temperature in the usable space, heating ovens and incubators shall be equipped with a temperature measuring device that can be read from the outside. The temperature shall be indicated in increments of at least
--1℃ for heating ovens
--0.2℃ for shaking incubators, and
--0.1℃ for incubators
The operating controls should be designed and arranged so as to prevent any unintentional alteration of the selected setting.
Safety requirements
As specified in DIN EN 61010-2-010; for shaking incubators the specifications given in DIN EN ISO 12100-2 also apply.
Electromagnetic compatibility
As in DIN EN 61326-1.
Sound power level
Built-in devices such as fans, pumps, motors or switching devices shall not exceed a sound power level of 85dB(A). The sound power level produced by the heating ovens and incubators covered by this standard should not exceed 65dB(A). This requirement does not apply to the noise level produced by the sample in shaking incubators.
Cleanability
The inner chamber of heating ovens and incubators shall not have any inaccessible areas, cavities, corners or edges, except where these are unavoidable, for example in the case of circulation fans, devices for air conduction or the driving mechanism of shaking incubators.
Usable space
The usable space of heating ovens and incubators shall be within the volume defined by the temperature sensors within the inner chamber. The maximum usable space shall be specified and documented by the manufacturer following testing for temperature homogeneity.
Requirements for heating ovens
Where required, heating ovens should be provided with suitably dimensioned vent connections capable of being shut and connected to an exhaust air duct.
Visibility of samples
It shall be possible to observe the samples over the whole usable space without opening the inner chamber. To this end, incubators may be fitted with a double door system provided with a glazed transparent inner door, for example.
Germ reduction
The inner chamber of incubators and shaking incubators shall be designed for germ reduction. The germ reduction method shall be specified by the manufacturer and described in the operating manual. Where integrated methods such as thermal methods are offered by the manufacturer, examples of the effectiveness of the integrated method should be given.
General test conditions
The tests specified below are type tests. During these tests, the ambient test conditions should be as similar as possible to those prevailing in a laboratory. The ambient temperature during the test shall be (22±3)℃. The ambient conditions should be maintained as constant as possible, for example, the heating oven or incubators should be protected from
--large heat emitting areas
--direct solar irradiation
--strong air currents
The measuring equipment used for the temperature tests, consisting of temperature sensors and recorders or indicators, shall be capable of determining the temperature differences between the measuring points with an expanded uncertainty of not more than 33% of the resolution of the temperature indication of the heating oven or incubator. The maximum response time should be five seconds.
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