40 Access Sensor Technologies UPAS User Guide
Table 6 below defines each parameter in the App.
Table 6 App Settings
App Button Description
Connection Status
Indicates either Disconnected or the serial number of the UPAS device that is the
mobile device is connected to via the App
.
Battery Charge
State of internal Li ION battery charge (as a percentage).
Battery Voltage
Internal battery voltage, in volts.
Sample Name
An optional label you may define which is intended to refer to the human subject ID, or
perhaps the designation you decide for this specific sample. The Sample Name
becomes part of the log file name and is also recorded within the log file.
Cartridge ID
Filter Cartridge three character alphanumeric label. The Cartridge ID becomes part of
the log file name and is also recorded within the log file.
GPS On / GPS Off
Toggles the GPS receiver in the UPAS On or Off. When On, the UPAS writes GPS
location data into the log file at each log entry. When Off, the UPAS does not log GPS
location data. The GPS uses a considerable amount of electrical energy when enabled –
more so if sampling exclusively indoors.
LED On / LED Off
Turns the UPAS indicator light On or Off. There may be instances where you decide to
turn the light off, for example at the request of a sample subject, etc. This option
defaults to On at each App reconnection. If the indicator light is turned Off you may
miss status indications during sampling
Normal Log
Debug Log
In Normal Log mode, the logging takes place every 30 seconds. In the Debug Log mode,
additional date is logged every one second.
Microenvironment
Detection On / Off
Toggles ME Detection in the UPAS On or Off. When On, the UPAS can determine if it is
within a set radius distance of up to four user-defined locational coordinates, and
record flags within the log file (see ME Coordinates, below). This feature is generally
used by expert users.
ME Coordinates
Available only when Microenvironment (ME) Detection is set to On. Allows user to
assign latitude/longitude coordinates of four different ME locations which are flagged
in the log file data when the subject is in proximity to them; labeled: Home Coordinates,
Home Coordinates 2, School Coordinates, School Coordinates 2.
Flow Rate
1
Target volumetric flow rate in units of liters per minute (LPM, L/min, or L*min-1), at
actual local atmospheric condition density. Options of 1.0, 1.5 and 2.0 L.
Flow Offset
2
Allows user to offset the volumetric flow rate (as a percentage). This user-selected
flow offset is persistent and does not change/reset by itself.
Duty Cycle
This is the percent of time that the UPAS Sampler is pulling air. 100% means
continuous sampling. Any other value simply applies as the fraction of a succession of
30-second time frames which pumping occurs (e.g., 50% has pump operating for
15-seconds, then off for 15-seconds, repeating indefinitely). The proper flow rate is
maintained during the on-period (so that the size-selective inlet continues to function
properly). The total integrated sample volume in the log file already reflects the effect
of the duty cycle (and is thus used, without further calculation, as the actual sampled
volume). Applying duty cycle <100% variously extends the battery endurance, at the
cost of a lower effective (time averaged) sampling rate, and thus PM sample
acquisition rate.
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