When using a calorimeter to measure the heat of coal:
(1) Since the temperature values (relative values) measured by different temperature probes are not exactly the same, their linearity may vary. Therefore, when replacing the temperature probe, it is necessary to recalibrate the calorimeter’s heat capacity to ensure accurate results.
(2) During the calibration of heat capacity and measurement of calorific value, if the ambient temperature changes by more than 5°C, the heat capacity should be recalibrated. Although platinum resistance is linear within a certain temperature range, no averaging correction is needed as long as it operates within the specified range. Otherwise, it could lead to significant errors. If there's no way to correct the average index of the temperature probe, the calorimeter’s heat capacity can be recalibrated so that the calibration matches the actual temperature conditions during the heat measurement, thus reducing thermometer-related errors.
(3) When using coal reference materials or standard benzoic acid to check the accuracy of the calorimeter, if the measured value differs from the standard value beyond the uncertainty range, or if the difference between the measured and standard heating value of benzoic acid exceeds 50 J/g, the calorimeter’s heat capacity should be recalibrated, provided no other explanation is found for the discrepancy.
Proper calibration and maintenance of the calorimeter are essential to ensure reliable and repeatable measurements, especially in environments where temperature fluctuations or component replacements are common. Always follow manufacturer guidelines and perform regular checks to maintain accuracy and safety standards.
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