56 Access Sensor Technologies UPAS User Guide
• Flashing Red indicator light means that a critical fault is occurring.
– The UPAS shuts itself down if the fault continues longer than 30
seconds.
– If the UPAS does shut down, it will have altered the ShutDownMode code
recorded in the SAMPLE SUMMARY section of the log file (see “Interpret-
ing Log File Data” on page 50).
The ShutDownMode parameter in the SAMPLE SUMMARY header section
in any log file will always hold one of the following codes. Note that code 3
is associated with a successful sample run completion, and code 1 may
be so if the sampler was intentionally shut down via pushbutton action:
– 0 = The microSD card was removed during use or has no remaining
storage space - or some other undefined error.
The sampler continues to operate if the microSD card is removed.
The summary data that is found on the microSD card represents the
sample up until the time that the card was removed.
– 1 = The UPAS was shut down via a pushbutton hold down.
This may or may not be an intentional sample run shut down consider
if it is expected that the sampler should have been shut down via the
pushbutton or not. Undesired pushbutton shut down can come from
a sample subject or bystander depressing the pushbutton.
– 2 = Preemptive shutdown because the battery voltage dropped
below 2.8 V.
The UPAS would have been operating under a flashing yellow light
before this happened.
Charge the internal battery of the UPAS per “Charging the UPAS
Internal Battery” on page 20.
– 3 = The pre-programmed sample run finished successfully by running
until the pre-programmed end time / duration.
This code is always associated with a successful sample run (for any
run that had a pre-programmed sample duration).
– 4 = Preemptive shut down for thermal protection reasons after
reaching a temperature of 60
°C.
Contact AST technical assistance If this condition and
ShutDownMode occurs repeatedly.
– 5 = Preemptive shutdown after pumps were driven to maximum
power during initialization (without reaching flow control).
This ShutDownMode can be associated with damaged pumps or
mass flow sensor contact AST for technical assistance.
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