6-14 Chapter 6: Gas Analyzer Operation 42/24-10 EN Rev. 9
User Interface Priority
Note The user interface is designated using the acronym “HMI”, which stands for
“human machine interface”.
User Interfaces The AO2000 series gas analyzers have several user interfaces.
• The local operation user interface is the display and control unit on the gas
analyzer (“local HMI”).
• The remote operation user interface is a PC running the “AO-HMI” software
(“remote HMI”).
For detailed information on remote operation, see the “AO-HMI” technical
bulletin (Publication No. 30/24-311 EN).
HMI Priority A gas analyzer (or more accurately an analyzer module) can only be operated via
one HMI.
The password hierarchy controls which HMI has or retains priority for operation
(refer to the following table). As a rule, the HMI with the Level n+1 password has
priority over an HMI with the Level n password. An exception is the local HMI with
Level n password which has priority over a remote HMI with a Level n password.
1st User: 2nd User:
Remote HMI has priority Local HMI has priority
Remote HMI Level n Priority with Level n+1 Priority with Level n
Local HMI Level n Priority with Level n+1
If a second user with an HMI receives priority over another HMI, all first user input
not confirmed with the ENTER key is lost and processes in progress (e.g. calibra-
tion) will be stopped.
Specifics for
Manual Calibration
Manual calibration runs at Level 0, thus no password is needed. It is protected in
the following manner from being stopped by another HMI:
On entering the Calibrate menu the Level 1 password is automatically
assigned. Therefore, any other HMI must at least enter a Level 2 password in
order to assume priority for operation. In this event the calibration run would be
stopped.
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