MSA ULTIMA X-Series, Руководство по эксплуатации

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MSA Appendix: HART Specific Information
ULTIMA X ® Series
136
GB
Sensor Zero countdown screen
Once the information screens are displayed, the device should start sending back
a status byte to indicate calibration progress. The first status message should be
the 30-second device countdown message. This message prompts user to start ap-
plying Zero gas if necessary. This screen also displays the current gas reading from
the sensor. [This screen is skipped for the Oxygen sensor as it uses an electronic
Zero]. This message displays during the 30-second countdown and the user can
abort the process at any time.

Fig. 36 for a view of this screen message.
Zero Adjustment screen
After the 30-second countdown screen [or the selection confirmation screen for an
Oxygen sensor], the device should send back a status message indicating that the
device is attempting to adjust the internal calibration. The user is instructed to apply
Zero gas at this time. The device waits for a stable reading to occur and then saves
the zero calibration data automatically. The user can abort the process at any time
by selecting the ABORT button.

Fig. 38 for a view of this screen.
Calibration completion message
Following a successful zero calibration, an information screen displays, indicating
the calibration process has completed. This is a five-second, timed message and
requires no user input.

Fig. 45 for a sample view of this information screen.
Calibration gas reminder screen
Once the device has performed a successful Zero function and stored the calibra-
tion information, it returns a calibration OK message. This causes a series of cali-
bration closure messages to appear. The first closure message is a reminder to
disconnect any calibration gases from the device.

Fig. 47 for a sample view of
this message screen. The user can abort this screen, but the only affect at this time
would be that the last information screen will not display.
Loop control reminder message
The final information screen following a calibration procedure is a reminder to return
the loop to automatic control.

Fig. 49 for a sample of this screen.
13.13 Standard Calibration Procedures
Standard Zero/Span Calibration Selection Menu
Select Sensor Calibration from the Sensor Trim Menu
Sensor calibration or “trim” functions are available from several locations in the
menu structure.

Fig. 30 for a view of this selection menu.
First warning screen
Once the sensor calibration feature is selected, a warning message displays to in-
dicate that the 4-20 mA output should be disabled from any automatic control loop