Access Sensor Technologies UPAS User Guide 55
– Duty Cycle: The preset duty cycle (%) is essentially the input / control you
can adjust to extend the battery endurance. Use the UPAS battery
energy management calculator available at www.accsensors.com
to help
determine a duty cycle percentage.
– External Battery: If the added weight/complexity are allowable, connect-
ing an external battery pack to the UPAS micro-USB port via cable adds
the capacity of the external pack to the UPAS internal battery capacity.
The Voltaic V15 (https://www.voltaicsystems.com/v15
)and V44
(https://www.voltaicsystems.com/v44
)models in Always-on mode are the
only known packs that reliably provide such extension to the UPAS (other
packs without the Always-on mode may fall asleep due to the nature of
the UPAS charging circuit).
– Charging: Connecting the UPAS via USB cable to an AC USB charger
ensures the UPAS can sample indefinitely. This may be an option for
some fixed-location sampling deployments.
Interpreting UPAS Status / Shutdown Mode Codes
The UPAS monitors its status continuously during actively sampling, from
initialization to shutdown. Unless user-disabled via the App, the status indicator
light reports the status in real time, and alerts you if there is a problem before
shutting the UPAS down.
• Solid Green indicator light indicates normal sampler function within nominal
parameters.
– UPAS interprets its volumetric flow rate to be within the
± 4% of set
point error band (Note that the flow-rate of the UPAS must be periodically
checked vs. a qualified flow rate primary (see “Flow Rate Verification and
Adjustment” on page 24; if necessary to adjust flow rate, see “Adjusting
the Flow Rate using the Flow Offset in the App” on page 45).
– Internal battery has more than 15% charge capacity.
– UPAS has not exceeded the maximum allowable drive power level.
– The internal circuit board is at a temperature of <60
°C.
• Flashing Yellow indicator light means the internal battery has been depleted
to below 15%, and the sampler is at risk of shutting down soon.
– If it is desired to continue the sample run for much longer the internal
battery will need to be charged soon (see “Charging the UPAS Internal
Battery” on page 20).
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