1、May 2007DEUTSCHE NORM English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 71.040.10!$K:R“1402347w
2、ww.din.deDDIN 12880Electrical laboratory devices Heating ovens and incubatorsElektrische Laborgerte Wrme- und BrutschrnkeSupersedesDIN 12880-1:1978-11,DIN 12880-2:1980-04,DIN 58945-1:1971-09 andDIN 58945-2:1971-09www.beuth.deDocument comprises 16 pagesIn case of doubt, the German-language original s
3、hould be consulted as the authoritative text.Translation by DIN-Sprachendienst.DIN 12880:2007-05 2 Contents Page Foreword3 1 Scope 3 2 Normative references 3 3 Terms and definitions .4 4 Dimensions.5 5 Material .5 6 Requirements.6 6.1 Common requirements .6 6.2 Requirements for heating ovens7 6.3 Re
4、quirements for incubators and shaking incubators7 7 Testing temperatures 7 7.1 General test conditions.7 7.2 Test equipment 7 7.3 Testing for temperature homogeneity and temperature stability.8 7.4 Deviation from set point and actual temperature 11 7.5 Heating and cooling times . 11 7.6 Recovery tim
5、e after door opening 12 7.7 Heat transfer to the environment 12 7.8 Type test report. 12 8 Testing of controlled atmospheres in incubators. 12 8.1 General test conditions 12 8.2 Test equipment . 13 8.3 Measurement of humidity 13 8.4 Measurement of CO2or O2concentrations 13 9 Operating instructions .
6、 13 9.1 General. 13 9.2 Heating ovens and incubators 14 9.3 Heating ovens . 14 9.4 Incubators 14 9.5 Shaking incubators. 14 10 Marking 14 Bibliography. 16 DIN 12880:2007-05 3 Foreword This standard has been prepared by Technical Committee Wrme- und Brutschrnke of the Normenaus-schuss Laborgerte und
7、Laboreinrichtungen (Laboratory Equipment Standards Committee). Amendments This standard differs from DIN 12880-1:1978-11, DIN 12880-2:1980-04, DIN 58945-1:1971-09 and DIN 58945-2:1971-09 as follows: a) All above-mentioned standards have been combined into one standard under the standard number DIN 1
8、2880. b) Requirements and tests have been brought into line with the state of the art. c) Tests for humidity, and for CO2and O2concentrations have been added. d) Terms and definitions have been modified and expanded. e) Specifications regarding marking have been modified. f) Since safety requirement
9、s are specified in DIN EN 61010-2-010 (VDE 0411-2-010), they are no longer included in this standard. Previous editions DIN 12880-1: 1978-11 DIN 12880-2: 1980-04 DIN 58945-1: 1971-09 DIN 58945-2: 1971-09 1 Scope This standard covers non-walk-in heating ovens and incubators suitable for a working tem
10、perature range of 10 C to 300 C. Incubators also include shaking incubators. The standard gives terms and definitions and specifies performance requirements and tests. Controlled-atmosphere test installations (e.g. as in DIN 50011) and hot air sterilizers are not covered by this standard. 2 Normativ
11、e references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) applies. DIN EN 13150, Workbenches for labor
12、atories Safety requirements and test methods DIN EN 61010-2-010 (VDE 0411-2-010), Safety requirements for electrical equipment for measurement, control, and laboratory use Part 2-010: Particular requirements for laboratory equipment for the heating of materials (IEC 61010-2-010:2003) DIN 12880:2007-
13、05 4 DIN EN 61326-1 (VDE 0843-20-1:2006-10), Electrical equipment for measurement, control and laboratory use EMC requirements Part 1: General requirements DIN EN 62079 (VDE 0039), Preparation of instructions Structuring, content and presentation DIN EN ISO 12100-2, Safety of machinery Basic concept
14、s, general principles for design Part 2: Technical principles 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 heating oven electrically heated cabinet enabling temperatures of a few degrees Celsius above ambient temperature to a maximum of 20
15、0 C, 250 C or 300 C to be controlled 3.2 drying oven heating oven used for drying samples (see 3.9) 3.3 vacuum oven vacuum drying oven drying oven capable of maintaining vacuum in the inner chamber 3.4 incubator heating oven used for biological or microbiological applications, with a limited tempera
16、ture range (e.g. 30 C to 70 C) and increased requirements regarding temperature stability and temperature homogeneity in the usable space NOTE Optionally, incubators may also allow the controlling of environmental parameters such as humidity, or CO2or O2partial pressure. Such incubators are referred
17、 to as cell or tissue engineering incubators. 3.5 cooled incubator incubator enabling the control of temperatures below ambient temperature, for example within a temperature range of 5 C to 70 C 3.6 shaking incubator incubator fitted with an integrated device for shaking the samples 3.7 inner chambe
18、r 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) 3.8 usable space that part of the inner chamber for which the temperature variations specified by the manufacturer apply NOTE Th
19、e limiting planes of the usable space are normally parallel to those of the inner chamber and are defined by the selected measuring points when testing for temperature variation as specified in subclause 7.3. DIN 12880:2007-05 5 3.9 sample any material, workpiece, receptacle containing a substance o
20、r similar charging material to be conditioned in the heating oven or incubator 3.10 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 NOTE Temperature homoge
21、neity is to be determined as specified in subclause 7.3.4. 3.11 temperature stability temporal temperature variation characterized by the maximum temperature difference measured at a single measuring point within the inner chamber of the heating oven or the incubator NOTE Temperature stability is to
22、 be determined as specified in subclause 7.3.5. 3.12 working temperature range temperature range between the lowest and the highest adjustable set point temperature 3.13 nominal temperature highest adjustable set point temperature 4 Dimensions Heating ovens intended to be fitted into laboratory benc
23、hes should be suitable for laboratory benches as specified in DIN EN 13150. 5 Material 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 ope
24、rated as intended. In the operating manual the manufacturer shall inform the user of the materials used (see 9.1 g) and give advise regarding the suitability of these materials for particular applications. The operating manual shall contain additional information on cleanability and, if appropriate,
25、 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
26、maximum temperature in the inner chamber is to be taken into account. DIN 12880:2007-05 6 6 Requirements 6.1 Common requirements 6.1.1 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 wei
27、ght they can support. The platforms connected to the shaking mechanism of shaking incubators shall be capable of securely fixing the sample to be agitated under all possible shaking conditions. 6.1.2 Temperature indicator and operating controls To indicate the temperature in the usable space, heatin
28、g 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 C for heating ovens 0,2 C for shaking incubators, and 0,1 C for incubators. The operating controls should be designed and arr
29、anged so as to prevent any unintentional alteration of the selected setting. 6.1.3 Safety requirements As specified in DIN EN 61010-2-010 (VDE 0411-2-010); for shaking incubators the specifications given in DIN EN ISO 12100-2 also apply. 6.1.4 Electromagnetic compatibility As in DIN EN 61326-1 (VDE
30、0843-20-1). 6.1.5 Sound power level Built-in devices such as fans, pumps, motors or switching devices shall not exceed a sound power level of 85 dB(A). The sound power level produced by the heating ovens and incubators covered by this standard should not exceed 65 dB(A). This requirement does not ap
31、ply to the noise level produced by the sample in shaking incubators. NOTE Where the sound power level or emission sound pressure level are to be determined, refer to guidelines for suitable methods of measurement given in DIN EN ISO 3740 or in DIN EN ISO 11200. 6.1.6 Cleanability The inner chamber o
32、f 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. DIN 12880:2007-05 7 6.1.7 Usable space The usa
33、ble space (see 3.8) of heating ovens and incubators shall be within the volume defined by the temperature sensors within the inner chamber (see 7.3.1). The maximum usable space shall be specified and documented by the manufacturer following testing for temperature homogeneity. 6.2 Requirements for h
34、eating ovens Where required, heating ovens should be provided with suitably dimensioned vent connections capable of being shut and connected to an exhaust air duct. 6.3 Requirements for incubators and shaking incubators 6.3.1 Visibility of samples It shall be possible to observe the samples over the
35、 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. 6.3.2 Germ reduction The inner chamber of incubators and shaking incubators shall be designed for germ reduction. The ger
36、m 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. 7 Testing temperatures 7.1 General test condition
37、s 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) C. The ambient conditions should be maintained as constant as possible, for exampl
38、e, the heating oven or incubator should be protected from large heat emitting areas (e.g. windows), direct solar irradiation, strong air currents (e.g. space heating, ventilation). NOTE When type testing, temperature homogeneity and temperature stability are determined in an empty heating oven or in
39、cubator, but including the accessories, such as shelves. The temperature characteristics of a loaded heating oven may vary substantially, especially when the oven is densely loaded or is loaded with exothermal samples. 7.2 Test equipment The measuring equipment used for the temperature tests, consis
40、ting of temperature sensors and recorders or indicators, shall be capable of determining the temperature differences between the measuring points with an DIN 12880:2007-05 8 expanded uncertainty of not more than 33 % of the resolution of the temperature indication of the heating oven or incubator (s
41、ee 6.1.2). The maximum response time (t0,9) should be five seconds. Recommended temperature sensors capable of meeting these requirements are platinum resistance thermometers or, for incubators, thermistors. Other temperature measurement methods may be used, provided they yield equivalent measuremen
42、t results. 7.3 Testing for temperature homogeneity and temperature stability 7.3.1 Arrangement of measuring points The temperature shall be measured in three horizontal measuring planes equally distributed over the inner chamber (see Figure 1). This requirement also applies if the position of a meas
43、uring plane is affected by assemblies in the inner chamber of the heating oven. Key 1 Inner chamber of the heating oven 2 Measuring plane Figure 1 Measuring planes In each measuring plane the temperature shall be measured at nine measuring points (see Figure 2). For smaller heating ovens/incubators
44、with an inner chamber smaller than 50 litres two measuring planes with four measuring points each (measuring points 2 to 5 in Figure 2) and an additional measuring point in the centre of the usable space are sufficient. DIN 12880:2007-05 9 Key Measuring points 1 to 9 Figure 2 Arrangement of measurin
45、g points The temperature measuring points shall be located at least 15 mm above the shelves and touch neither the shelves nor the chamber walls (see Figure 3). When testing vacuum ovens, the temperature measuring points shall be in direct contact with the shelves, since heating of the samples in vac
46、uum ovens is largely due to thermal conduction via the shelves. The temperature should be measured at five measuring points (measuring points 1 to 5 in Figure 2) in each measuring plane. The individual measuring planes may be measured sequentially. NOTE In vacuum ovens the temperature homogeneity me
47、asured in this manner relates only to unloaded shelves. Key 1 Measuring point 2 Shelf a Distance between measuring point and shelf Figure 3 Distance between measuring point and shelf The distance between the temperature measuring points and the walls shall be about one tenth of the width, height or
48、depth of the inner chamber (see b in Figure 4). This distance determines the position of the measuring planes (see Figure 1). DIN 12880:2007-05 10 Figure 4 Distance between temperature measuring points and chamber walls When testing shaking incubators, the temperature is to be measured at five measu
49、ring points as shown in Figure 2 in a measuring plane at least 15 mm above the inserted empty plate. 7.3.2 Test temperatures The test shall be carried out at the following three temperatures: within the lower fifth of the working temperature range, but at a maximum of 20 C above the minimum working temperature; within the upper fifth of the working temperature range, but at a maximum of 20 C below the nominal temperature; at a temperature in the middle of the working temperature range. As a departure from the above-mentioned
