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Auto Power-off
When the logger contains data from a previous run which has not been
downloaded, or is indicating an error, the logger-status red LED will be flashing.
If the logger is left in this state there is potential for the battery to flatten, and
the logger will therefore power-off automatically after five minutes. On
subsequent power-up, the logger will either return to its pre-power-off state
or, if the communications lead is connected, be ready to communicate with
the PC.
Best Practice with the XDL12
The XDL12 is a highly accurate logger which utilizes a specially-designed cold-
junction compensating unit to minimize errors. But note that...
...the following guidelines must be observed to ensure
Temperature Stabilization
When carrying out a survey, let the logger stabilize at the ambient
temperature in the area where it will be used (i.e. near the furnace) for
1 hour before starting data-collection. This is especially important when
bringing the logger from an air-conditioned office to a warm workshop, or
from a warm office to a cool workshop.
Do not place the logger where there may be sudden temperature
changes, e.g. where there may be a draught from an opening door or
where hot air may issue from a furnace.
Powering the Logger
While a survey is in progress, whenever possible run the logger only
from its battery – i.e. if it is avoidable, do not use the battery charger as a
means of powering the logger from mains electricity. A fully-charged battery
will last at least 60 hours with a sample interval of 30 seconds, and this is
generally far longer than is required for a survey.
Using and Connecting Thermocouples
For ease of use, the XDL12 utilizes standard thermocouple sockets. To
ensure the highest accuracy, extension cables and compensating cables
supplied by Datapaq have plugs from the same manufacturer as the sockets.
16
Specifications and Operation
maximum accuracy.
DATAPAQ XDL12
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