Both options have their uses.
If the TempTags are only configured and downloaded in one location then the "stop measuring " (not-rollover) option should be chosen. An example would be where cargo was shipped to a remote destination, the TempTag removed at the destination and then sent back to the originating office for downloading. In this case the temperature of the cargo is of interest and not the temperature of the parcel on the return trip.
If the TempTags was placed in a fixed loaction (for examle, a fridge) then the rollover soption should be chosen. This means that the tag can be configured once and then regularlydownloaded. As long as it is downloaded again before it rolls over then a continuous record of the temperature can be otained.
Assorted Hints
• Unless the TempTag is in a fixed location the logging interval should be set so that the TempTag does not stop logging/rollover too quickly. It is advisable to ensure that there is a large time buffer between when the mission is expected to end and when the Temp Tag will reach the end of it's recording memory.
If there is not a large buffer and cargo is delayed then there will not be a complete temperature history for the items - the very thing that you are trying to achieve!
• Because the TempTag is quite small it responds fairly quickly to changes i temperature. Take care when placing the TempTag to ensure that it is not affected by air drafts that are not representative of the temperature you are trying to measure.
For example, if the TempTag is on the surface of a frozen package, then the TempTag may record that the temperature of the package rapidly went up when it was moved from the freezer into a transport vehicle. In reality, the air temperature would have gone up rapidly (which is what the TempTag may have measured) but the package would have remained frozen.
Another example would ne a refrigerator where the TempTag could be hit by a draft of warm air when the door is opened. In this case it may be wise to place the TempTag into a small box/container that replicates the other items stored in the refrigerator.
• The logging interval should be chosen to suit both the length of time that the unit needs to record for as well as the environment it is recording in . If it is attached to a very large item then there is little use in recording the temperature every minute! (the temperature won't change that quickly. However, if it is attached to a small item or is in the air then the temperature every minute could be relevant.
• The TempTag only records the temperature at the logging interval - it is the temperature at that instant, not the average since the last reading.
• Circuitlink supplies other tags which look similar to the TempTags but which are designed to work with other products (they have green, red or blue holders). These will not work with the TempTags system
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