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Maximum humidity indicator cards are irreversible, thus indicating the highest level of humidity experienced by cargo during its voyage, regardless of current (potentially lower) humidity levels. They provide a clear, unmistakable means of determining if goods have been exposed to damaging humidity levels during their journey.
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Critical temperature indicators: These monitor a critical temperature threshold that, if exceeded, may cause irreversible damage to the product. [ 3 ] Digital temperature data loggers are available to indicate the full temperature history of a shipment to help identify the time period that out-of- tolerance temperatures were encountered.
Moisture sensitive devices are packaged in a moisture barrier antistatic bag with a desiccant and a moisture indicator card which is sealed. Moisture sensitivity levels are specified in technical standard IPC / JEDEC Moisture/reflow Sensitivity Classification for Nonhermetic Surface-Mount Devices . [ 1 ]
Complexometric indicator, a chemical detector for metal ions in complexometric titrations. Humidity indicator card, a card impregnated with chemicals that change colour when a particular humidity is exceeded. pH indicator, a chemical detector for protons in acid-base titrations. Redox indicator, a chemical detector for redox titrations.
A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much of it is water vapor. [1] Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, and mechanical or electrical changes in a substance as moisture is absorbed.
A generalized view of the heat index showing how the perception of heat by the human body increases with temperature but more rapidly at higher humidity levels. The heat index of a given combination of temperature and humidity is defined as the dry-bulb temperature which would feel the same if the water vapor pressure were 1.6 kPa. Quoting ...
It is important to measure the RH of spaces regularly by using a number of tools including humidity indicator cards, thermo-hygrographs, hygrometers, psychrometers and data loggers. Once these data are being monitored, there are several ways to adjust relative humidity by using humidifiers , dehumidifiers , improving heating and air ...
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