• Any of the four arrow keys can be used to display the next screen of the Main
Display mode (see Section 3.1.2.3).
3.1.1.3 Esc
The Esc key is used as follows:
• In the Menu Navigation mode (see Section 3.1.2.2), it is used to return to the
preceding level in the menu hierarchy.
• When changing a value, it cancels the current modification and returns to the
preceding level.
• It can be used to switch from the Main Display mode to the Main Menu, and
vice versa.
3.1.2 Operating Modes
The Hydran M2-X’s user interface has three operating modes:
• First priority: Unacknowledged Alarms mode (see Section 3.1.2.1). In this
mode, the Hydran M2-X displays messages of unacknowledged alarms.
• Second priority: Menu Navigation mode (see Section 3.1.2.2). In this mode,
the user accesses the Hydran M2-X’s Main Menu’s options, parameters and
commands.
• Third priority: Main Display mode (see Section 3.1.2.3). In this mode, the
Hydran M2-X displays up to four screens of messages:
– Gas readings and trends.
– Moisture readings and averages.
– Readings of the optional analog inputs (present only if one or more analog
inputs are installed).
– List of active alarms.
Note: The Hydran M2-X automatically returns to the Main Display mode if the keypad
is not used for five minutes.
3.1.2.1 Unacknowledged Alarms Mode
Note: Alarms are explained in detail in Chapter 7. Alarm messages due to system fault
conditions are listed in Section 8.1. Appendix I presents the list of all alarm messages
that can be displayed by the Hydran M2-X and that can appear on the Perception
software.
In this mode, the display shows the list of detected alarm conditions that have
not yet been acknowledged; each displayed screen corresponds to one alarm
condition. If two or more unacknowledged alarm conditions are present, the Hydran
M2-X rotates through the screens; each one is displayed for five seconds. A screen
example is shown in Figure 3-3.
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