Access Sensor Technologies UPAS User Guide 45
Updating the Mobile Device App
Set your mobile device (Android or iOS device) to Auto-Update. When a revised
App becomes available, your device automatically updates.
Alternately, when available, simply download the latest App software from either
the Google Play Store (see“Install and Run the App on an Android Operating
System” on page 30) or the App Store for iOS devices (see “Install and Run the
App on an Apple iOS Operating System” on page 35.
Adjusting the Flow Rate using the Flow Offset in the App
If, after testing the flow rate (see “Flow Rate Verification and Adjustment” on
page 24), you determine that a substantial error exists, you may adjust the UPAS
flow rate to compensate for the error. You must decide if the error is real and
significant enough to justify setting a flow offset. This means verifying that the
flow meter has sufficient accuracy, is within its normal calibration cycle, etc.
CAUTION: The UPAS was calibrated at the factory and should not be changed
unless a substantial error is found during the flow measurement. Do not
arbitrarily set a Flow Offset in the App.
The basic process follows:
1 Verify the flow control accuracy of the UPAS via a sampling run to check
flow (see “Flow Rate Verification and Adjustment” on page 24).
2 If the verification reveals an error that is not acceptable and you want to
try to reduce the error:
a End the measurement run by pressing and holding the UPAS power
button for five seconds.
b Power the UPAS back on.
c Reconnect the UPAS to the App and enter a flow offset percentage to
attempt to correct the error.
3 Re-run a flow rate verification (using the flow adapter and a flow meter
primary as described above) and check the UPAS flow.
4 Repeat steps 1 through 3 as many times as necessary until the controlled
flow rate of the UPAS matches the flow set point as measured on the
qualified flow meter primary.
5 Leave that offset in place for future sample runs. The flow offset volume
is persistent until it is manually changed again.
If measured flow rate error is unacceptable even with Flow Offset dialed to the
maximum of +/-9%, the UPAS should be factory-recalibrated. Contact Access
Sensor Technologies (support@accsensors.com).
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