countdown wait for gas connection and transport. The user is prompted
to start applying the Span calibration gas at this time. (For a 0-25%
Oxygen sensor, the sensor can be spanned using room air.) See
FIGURE D-14 for a sample view of this screen. The red LED is ON
solid and the green LED is blinking on the main board to indicate the
start of the Span procedure.
Adjusting Span screen
After the 30-second Span initialization, a Span adjustment screen
displays and continually updates with the gas (PV) reading, units and
type information. Once the device detects a stable reading, the data is
stored automatically and the user is notified of the completion status.
See FIGURE D-15 for a sample view of the Span adjustment screen.
The user can abort the procedure at any time and the prior calibration
data is restored.
Calibration completion message
Upon successful completion of the SPAN procedure, an information
screen displays. See FIGURE D-16 for a sample completion screen.
This is a five-second information screen; no user action is required.
Calibration gas reminder screen
Following the Calibration completion screen, another information screen
is presented to inform the user to disconnect any calibration gas from
the device. This is a five-second timed message; no user
acknowledgement is required. See FIGURE D-17 for a view of this
information screen.
Loop control reminder message
The final calibration screen is an information screen prompting the user
to reconnect the sensor output to any automatic control process that
was disconnected at the start of the procedure. The user is required to
acknowledge this screen. See FIGURE D-18 for a sample view of
this screen.
D-39
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