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Hydran* 201i Instruction Manual
conditions. At low temperatures, the LCD display might not be legible, but all other
functionalities are fully operational.
• A six-key keypad (see Section 5.3), also designed to function under an extremely
wide temperature range.
The H201Ti's user interface has three main functions:
• First priority: To display all unacknowledged alarm messages requiring an action
from the user. This task corresponds to the Unacknowledged Alarms mode
(Section 5.2.1).
• Second priority: To execute commands requested through the keypad and to
display the parameters from the Main Menu and the Extended Menu. These tasks
correspond to the Menu Navigation mode (Section 5.2.3) and the Parameter
Modification mode (Section 5.2.4).
• Third priority: If all active alarms have been acknowledged and if the keypad is
not used, to display a list of messages at a rate of one message every five
seconds. This task corresponds to the Main Display mode (Section 5.2.2).
5.2
User Interface Operating Modes
The Hydran 201Ti's user interface uses five operating modes:
• Unacknowledged Alarms mode (Section 5.2.1):
messages of unacknowledged alarms. The user acknowledges an alarm by
pressing the ENTER key while the corresponding alarm message is displayed on
the display.
• Main Display mode (Section 5.2.2): In this basic, unattended operating mode (if all
active alarms have been acknowledged and if the keypad is not used), the H201Ti
displays a list of four messages:
-
Gas level (in ppm).
-
Hourly trend (in ppm/x hours).
Daily trend (in ppm/x days).
-
-
Date and time.
• Menu Navigation mode (Section 5.2.3): This mode gives access to the H201Ti's
parameters and commands.
• Parameter Modification mode (Section 5.2.4): This mode is used with the Menu
Navigation mode to set the H201Ti's parameters (alarm levels, date and time,
etc.).
• Power-up mode (Section 5.2.5): This mode is used only during the H201Ti's
power-up. Three sequences can occur:
-
Normal power-up: Occurs if the AC power supply has been off for more
than five minutes.
-
Short power-up: Occurs if the AC power supply has been off for less than
five minutes.
-
First power-up: Occurs if the H201Ti's battery has been disconnected and
reconnected.
MA-033
Rev. 14.0, 12-Nov-18
The H201Ti displays flashing
Page 57
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