MN1010 Rev. G
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•
Top of the readings screen shows
Overload
•
Dose rate is displayed as
>100mSv/h
or
>1 Sv/h
. (or equivalent in rem/h).
•
Dose values are still displayed, but flash to indicate possible inaccuracies.
•
Status bar shows a warning symbol and
Dose Error?
message.
•
Alarm sounds continuously until the button is pressed.
Once the dose rate falls below 100 mSv/h (10 rem/h) or 1 Sv/h (100 rem/h) for, the top of the screen returns to the
standard display and the dose rate returns to live values. However:
•
The total dose values continue to flash.
•
The status bar continues to show a warning symbol and the
Dose Error?
message.
•
The alarm continues to sound until the button is pressed.
On transferring the data to the computer running DoseVision™:
•
The total dose values stop flashing.
•
The
Dose Error?
message is cleared.
2.5
Data logging
Dose and dose rate data is recorded in the following modes:
Periodic logging
In periodic logging, PEDs record the accumulated dose periodically in 60s, 30s, 10s, or 5s intervals. The
default is 60s. Periodic logging at 5s intervals is used for logging GPS location data. The memory of PEDs
can store up to 125,000 data points. Therefore, the memory stores around 2000 hours of operation with a
60s interval and 167 hours with a 5s interval. Tracerco recommends using periodic logging if PEDs
deployed in areas where dose rates are consistently above background or rapid dose rate fluctuations are
not anticipated.
Intelligent logging
In intelligent logging, PEDs record the accumulated dose for every 0.01 μSv change in dose. In normal
circumstances, intelligent logging uses the memory most efficiently. Intelligent logging is the default logging
mode.
A status warning message alerts users when the memory is 70% full, meaning that around 600 hours of operation
are left. Then, when the memory is 95% full a critical malfunction warning is displayed. If the memory is completely
full, PEDs continue to measure and display the true current accumulated dose. However, new date and time
information is not recorded.
Data is downloaded from PEDs to the Tracerco
DoseVision™ software. After downloading the data, the memory is
cleared.
Attention
: The memory of PEDs is non-volatile. Therefore, data is not lost in the event of the battery running out of
charge.
2.6
Tasks
Tasks monitor the dose and peak dose rate for a specified time or task. Tasks are started and stopped manually.
When a task is running, the readings screen shows the current accumulated dose value since the task started as
shown below.