Temperature compensation
What does the term mean?
A reading may change as temperature rises or falls even when the target product quantity stays constant. Temperature compensation accounts mathematically for a described temperature effect, using temperature information and a relationship suited to the product.
Relevance to process measurement
First specify the required result: a value at current process conditions or one referred to defined conditions. This determines what needs correcting. The presence of a temperature sensor alone does not establish a correction valid for every product.
How is a temperature correction checked?
Examine the intended temperature range together with relevant product states. Comparison samples help distinguish signal changes from actual changes in the target quantity. Temperature and product sensors must capture sufficiently well-matched states in time.
Different response times can matter during rapid changes. The relationship is not automatically valid outside the checked range. Recipe changes, air and deposits are not generally covered by temperature correction alone. For MicroSinus, align the task and evaluation during application-specific project planning.
Interpreting rapid temperature changes correctly
A temperature correction requires temperature data that corresponds to the measured product condition. If the product and temperature sensors are located at different points or respond at different rates, temporary deviations may occur during rapid changes. For a test, therefore, both stable operating conditions and the anticipated changes should be taken into account. Note which measured value is actually being corrected and to which reference conditions the output result relates. Without this specification, it remains unclear which variation is actually to be compensated for.
Compare the corrected values with suitable reference samples across the temperature range under investigation. If the formulation also changes, both influences must be kept separate in the evaluation. A correction that has been tested for a specific product is not automatically valid for every other composition. Furthermore, air or deposits at the measuring point cannot be described by temperature data alone.
For the design, specify the typical temperature range, expected variations and the desired reference for the result. Add details of where the temperature is measured and which laboratory method is used for comparison. Following changes to the product or installation, these records can be used to specifically verify whether the previous correction remains sufficiently substantiated.