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The storage, environmental testing, culture and sterilisation of samples in industry requires the use of temperature controlled enclosures, such as freezers, fridges, incubators, sterilisers and environmental chambers. In order to determine the effectiveness of these enclosures, temperature mapping of the test volume is carried out to identify thermal variations with respect to chamber volume and mapping duration. This is a regulatory requirement in some industries. Currently there are a variety of methods employed to perform temperature mapping, which can lead to inconsistencies and give calibration results that may be method dependent. There is a need to standardize these methods in order to improve the quality and reliability of the results reported. Based on research and experience in this field, the National Metrology Laboratory (NML) in Ireland have compiled a user's guide for Temperature Mapping. This includes recommended mapping methods, contents of a temperature mapping report, an evaluation of key components to be included in an uncertainty budget and a realistic Calibration and Measurement Capability (CMC) over the range from −70 °C to 180 °C. |
